Holding device for storage container of needleless injector and needleless injector

Abstract

The present invention provides a holding device for a storage container of a needleless syringe, which is switchable between a locked state in which the holding device is capable of preventing the storage container from being mounted to or removed from a syringe body of the needleless syringe, and an unlocked state in which the holding device is capable of preventing the storage container from being mounted to or removed from the syringe body of the needleless syringe. In the unlocked state, the holding device is capable of allowing the storage container to be mounted to the syringe body or removed from the syringe body, the holding device comprising: an operable member operated by an operator to switch between the locked state and the unlocked state; the linkage mechanism is switched between a first state and a second state in response to operation of the operable component. Also provided is a needleless injector comprising the retaining device. According to the holding device and the needleless injector, the built-in medicine storage bottle can be freely installed and taken out of the injector, the built-in medicine storage bottle can be easily taken and placed without using an independent tool, and convenience is provided for an operator to use the needleless injector.

Description

Technical Field

[0001] The present invention relates to a medical device for injecting an injectable substance, in particular to a needle-free injector for injecting liquid medicines. More specifically, the present invention relates to a holding device for a storage container of a needle-free injector and the needle-free injector. Background Art

[0002] In medical scenarios, when using a needle-free syringe, it is usually necessary to first install the medicine tube for containing the injection onto the syringe body, and then extract the injection from a separately placed medicine storage bottle through the distal end of the medicine tube. After the extraction is completed, the distal end of the medicine tube must be separated from the medicine storage bottle before injection. The operation process of this type of syringe is relatively complicated and requires high skills from the operator. It is usually operated by professional medical staff and is not suitable as a home syringe for ordinary people to operate at home.

[0003] In view of this problem, the existing solution is to improve the structure of the syringe and improve the traditional external medicine storage bottle to an internal medicine storage bottle so that it can be accommodated in the syringe body. During operation, the drug aspiration process is first performed. Through the movement of the piston rod in the medicine tube, the injection is sucked from the medicine storage bottle in the syringe body through the proximal end of the medicine tube into the receiving chamber, and then the injection is completed.

[0004] However, this built-in medicine storage bottle can usually only be installed into or removed from the syringe body together with the injection head including the medicine tube and the piston rod. When the medicine storage bottle needs to be replaced, it is difficult for the operator to flexibly take and place the medicine storage bottle separately, making it difficult to change the medicine.

[0005] Therefore, it is necessary to provide a holding device for the medicine storage bottle of a needle-free syringe to improve the existing needle-free syringe so that the medicine storage bottle can be freely installed and removed therein, so as to at least partially solve the above-mentioned problems of the existing needle-free syringe. Summary of the invention

[0006] In order to overcome the above-mentioned shortcomings of the prior art and facilitate the free replacement of the built-in medicine storage bottle in the needle-free syringe, according to one aspect of the present invention, a holding device for a storage container of a needle-free syringe is provided, wherein the storage container can be removably installed in the needle-free syringe, and the holding device is configured to be switchable between a locked state and an unlocked state, wherein in the locked state, the holding device can prevent the storage container from being installed on the syringe body of the needle-free syringe or being removed from the syringe body, and in the unlocked state, the holding device can allow the storage container to be installed on the syringe body or be removed from the syringe body, wherein the holding device comprises: an operable component, an operable The component can be operated by an operator to move between a locked position and an unlocked position of the operable component to switch the retaining device between a locked state and an unlocked state; a linkage mechanism, the linkage mechanism is configured to switch between a first state and a second state in response to the movement of the operable component between the locked position and the unlocked position, wherein, when the operable component is in the locked position, the linkage mechanism is in the first state to prevent the storage container from being installed on the syringe body or being removed from the syringe body, and wherein, when the operable component is in the unlocked position, the linkage mechanism is in the second state to allow the storage container to be installed on the syringe body or be removed from the syringe body.

[0007] In some preferred embodiments, the linkage mechanism is held by a tubular first inner push rod within the outer housing of the syringe body, and wherein the storage container can be received inside the first inner push rod.

[0008] In some preferred embodiments, the linkage mechanism includes: a limiting mechanism, which is configured to move between a first position and a second position in response to the movement of an operable component between a locked position and an unlocked position; and a blocking mechanism, which is configured to switch between a blocking state and a non-blocking state in response to the movement of the limiting mechanism between the first position and the second position, wherein, when the limiting mechanism is in the first position, the blocking mechanism is in a blocking state, and the blocking mechanism in the blocking state can interfere with the storage container in a radial direction to prevent the storage container from being installed on the syringe body or being removed from the syringe body, and wherein, when the limiting mechanism is in the second position, the blocking mechanism is in a non-blocking state, and the blocking mechanism in the non-blocking state does not interfere with the storage container to allow the storage container to be installed on the syringe body or be removed from the syringe body.

[0009] In some preferred embodiments, the operable component is arranged on the external housing and is configured as a press-type operable component.

[0010] In some preferred embodiments, the operable component is arranged on the external housing and is configured as a push-type operable component.

[0011] In some preferred embodiments, the limiting mechanism is configured to be movable in the axial direction between the first position and the second position in response to movement of the operable component in the axial direction between the locked position and the unlocked position.

[0012] In some preferred embodiments, the operable component can be mounted in a recessed portion of a circumferential side wall of an outer housing of the syringe body, and the operable component can move in the recessed portion between a locked position and an unlocked position along an axial direction relative to the outer housing.

[0013] In some preferred embodiments, the operable component includes: a base extending in an axial direction; an operator engaging portion, which is configured to extend outward in a radial direction from a radial outer surface of the base and can be engaged by an operator to operate the operable component to move between a locked position and an unlocked position; a sliding portion, which is configured to extend inward in a radial direction from a radial inner surface of the base, and the radial inner surface of the sliding portion can contact the radial outer surface of the bottom wall of the recessed portion of the external shell to move in an axial direction on the surface; and a protrusion, which is configured to extend inward in a radial direction from the radial inner surface of the sliding portion and protrude from an opening at a corresponding position of the bottom wall of the recessed portion toward the radial inner side of the external shell, the opening extending in an axial direction and allowing the protrusion to move in an axial direction therein, and wherein the protrusion can engage a linkage mechanism so that the linkage mechanism switches between a first state and a second state in response to the movement of the protrusion in the opening of the recessed portion in an axial direction.

[0014] In some preferred embodiments, the sliding portion of the operable component includes a columnar component extending in the axial direction, and an end wall of the recessed portion perpendicular to the axial direction is provided with a hole aligned with the columnar component, and wherein the retaining device also includes a first spring extending in the axial direction, the first spring including: a first end portion accommodated and restricted in the hole of the end wall of the recessed portion; and a second end portion sleeved on the outer peripheral side of the columnar component, wherein the first spring is configured to bias the operable component toward a locked position through the columnar component.

[0015] In some preferred embodiments, the locked position of the operable component is positioned distally relative to the unlocked position, wherein a cylindrical component extends proximally from a proximal end surface of the sliding portion, a hole is opened in a proximal end wall of the recessed portion, and wherein the first spring is configured to bias the operable component toward the distal locked position via the cylindrical component.

[0016] In some preferred embodiments, the retaining device also includes a first guide engagement portion extending in an axial direction and arranged in a recessed portion of the external shell, wherein the sliding portion of the operable component includes a second guide engagement portion extending in the axial direction, and wherein the first guide engagement portion and the second guide engagement portion are constructed to be able to cooperate with each other to guide the movement of the sliding portion of the operable component in the recessed portion of the external shell.

[0017] In some preferred embodiments, the first guide joint is constructed to include at least one guide column fixedly arranged in a recessed portion of the external shell, and the second guide joint is constructed to include at least one through hole extending through the sliding portion in the axial direction, each through hole being matched with the shape of the corresponding guide column, thereby allowing the sliding portion to move in the axial direction through the axial movement of each through hole on the corresponding guide column.

[0018] In some preferred embodiments, the two ends of each guide column in the axial direction are respectively accommodated and fixed in two U-shaped fixing members extending outward in the radial direction from the radial outer surface of the bottom wall of the recessed portion, and the two U-shaped fixing members are configured to jointly limit the movement of the guide column.

[0019] In some preferred embodiments, the number of the through holes of the sliding portion is two, and the two through holes are respectively opened at positions close to the two ends of the sliding portion parallel to the axial direction, and accordingly, the number of the guide columns is two, and the two guide columns are respectively located at positions on the recessed portion corresponding to the circumferential positions of the two through holes of the sliding portion.

[0020] In some preferred embodiments, the blocking mechanism includes a first annular component, the first annular component includes a blocking portion, the blocking portion is provided with a through hole extending in a radial direction, a ball is accommodated in the through hole, wherein the diameter of the through hole is not smaller than the ball to allow the ball to move back and forth in a radial direction along the inner wall surface of the through hole, and wherein the through hole includes: a first opening end located radially inner, a second opening end located radially outer, and a first annular flange extending from the inner wall surface of the through hole to the inside of the through hole at the first opening end, the size of the first flange is constructed to: allow at least a part of the ball to protrude radially inward from the first opening end of the through hole, and at the same time prevent the ball from continuing to move radially inward and disengage from the through hole.

[0021] In some preferred embodiments, the limiting mechanism includes a second annular component sleeved on the outer peripheral side of the first annular component, and the second annular component is configured to move in the axial direction between the first position and the second position in response to the movement of the protrusion in the axial direction in the opening of the recessed portion of the external shell, wherein the second annular component includes an annular second flange extending radially inward from the inner wall surface of the second annular component, wherein when the second annular component is in the first position, the second flange is aligned with the through hole of the blocking mechanism in the axial direction, and the radial inner surface of the second flange resists the ball in the through hole of the blocking mechanism to force at least a part of the ball to protrude radially inward from the first opening end of the through hole, thereby interfering with the storage container in the radial direction, and wherein when the second annular component is in the second position, the second flange is staggered with the through hole of the blocking mechanism in the axial direction to allow the ball to move freely radially outward to a position where it no longer protrudes radially inward from the first opening end of the through hole, thereby no longer interfering with the storage container.

[0022] In some preferred embodiments, the proximal end of the first ring-shaped member is configured to be fixed to the distal end of the first inner push rod.

[0023] In some preferred embodiments, the first position is located distally relative to the second position, wherein the limiting mechanism also includes a second spring, the second spring is positioned between the first annular component and the second annular component, and is sleeved on the outer peripheral side of the first annular component, wherein the proximal end of the second spring abuts the distal end surface of the first internal push rod, and the distal end of the second spring abuts the proximal surface of the second flange of the second annular component, and wherein the second spring is configured to bias the second annular component toward the distal first position through the proximal end surface of the second flange.

[0024] In some preferred embodiments, the proximal end of the first annular component is formed with an external thread, and the distal end of the first internal push rod is formed with an internal thread that cooperates with the external thread of the first annular component.

[0025] In some preferred embodiments, a slope is formed on the distal side of the second flange of the second annular component, wherein, when the second annular component moves proximally from the first position to the second position in the axial direction, the ball can move along the slope of the second flange to a position where it no longer protrudes radially inward from the first opening end of the through hole.

[0026] In some preferred embodiments, the second annular component further includes a third flange, which is located at a distal portion of the second annular component and extends radially inward from an inner wall of the second annular component, wherein the second flange is located proximal to the third flange, and a first annular groove is formed between the second flange and the third flange, and the first annular groove is configured to at least partially accommodate the ball when the second annular component is in the second position.

[0027] In some preferred embodiments, the first annular component includes a plurality of through holes distributed circumferentially, and a ball is accommodated in each through hole.

[0028] In some preferred embodiments, the plurality of through holes are arranged at equal intervals.

[0029] In some preferred embodiments, the holding device further comprises a base for holding the storage container, wherein the base is located proximally of the storage container and is configured to be shaped to fit with the proximal end of the storage container for accommodating and holding the proximal end of the storage container.

[0030] In some preferred embodiments, the retaining device also includes a third spring, which is configured to be positioned between the base and a tubular second internal push rod within the external shell of the syringe body, the second internal push rod being configured to be located proximal to the first internal push rod and fixed to each other, wherein the third spring is configured to be able to bias the base toward the distal side in the axial direction.

[0031] In some preferred embodiments, the second internal push rod includes: a first axial extension portion, the first axial extension portion includes an elongated first through groove opened on the side wall and extending in the axial direction, the first through groove extending to the distal end of the first axial extension portion; and a second axial extension portion extending distally from the distal end of the first axial extension portion, wherein an annular fourth flange extending radially inward from the inner wall surface of the first axial extension portion is provided at a substantially middle position in the axial direction of the first axial extension portion, and wherein the second axial extension portion is used to engage the proximal end of the first internal push rod so as to be fixed to each other with the first internal push rod.

[0032] In some preferred embodiments, the base includes: a third axial extension portion, a distal portion of the third axial extension portion is provided with a protrusion extending distally, the protrusion corresponds to the position of the first through slot of the second internal push rod, so that it can move along the axial direction in the first through slot; and a fourth axial extension portion extending distally from the distal end of the third axial extension portion.

[0033] In some preferred embodiments, the proximal end of the third spring abuts the distal surface of the fourth flange of the second internal push rod, and the distal end of the third spring abuts the internal step surface extending perpendicular to the axial direction in the connecting area between the third axial extension portion and the fourth axial extension portion of the base, so that the base can be biased distally in the axial direction through the internal step surface.

[0034] In some preferred embodiments, the storage container includes a drug storage area located distally and an annular coupling area extending proximally from the proximal end of the drug storage area, the coupling area being held between the tab of the third axial extension portion of the base and the fourth axial extension portion, and wherein the proximal end of the coupling area abuts against an outer step surface extending perpendicular to the axial direction of the connecting area between the third axial extension portion and the fourth axial extension portion of the base, so that when the operator operates to unlock the retaining device, the storage container can follow the base and be pushed out of the syringe body by the third spring.

[0035] In some preferred embodiments, the second axially extending portion of the second inner push rod is provided with an internal thread, and the proximal end of the first inner push rod is provided with an external thread that cooperates with the internal thread of the second axially extending portion.

[0036] In some preferred embodiments, the first axially extending portion of the second inner push rod includes a plurality of first through slots, and the third axially extending portion of the base includes a plurality of protrusions corresponding in position to the first through slots and having the same number as the first through slots.

[0037] In some preferred embodiments, the inner wall surface of the proximal end of the first inner push rod is provided with a second annular groove, and the second annular groove accommodates a rubber ring that contacts the outer peripheral side surface of the storage container, and the rubber ring is used to prevent the storage container from moving.

[0038] In some preferred embodiments, the first annular component further comprises an engaging portion located at a distal side of the blocking portion, wherein the engaging portion is used to engage with a piston rod of the injection head to be fixed to the piston rod.

[0039] In some preferred embodiments, the engaging portion of the first annular component is formed with a third annular groove near the distal end of the first annular component, and wherein the proximal end of the piston rod is provided with an elastic snap-on portion extending proximally in the axial direction, and the snap-on portion can be snapped to the distal end surface of the third annular groove, so that the piston rod and the first annular component are fixed to each other.

[0040] In some preferred embodiments, the limiting mechanism includes a slip ring component, which is arranged in the first internal push rod and is sleeved on the storage container. The slip ring component can move axially relative to the storage container between the first position and the second position in response to the movement of the operable component between the locked position and the unlocked position. The slip ring component includes: a distal cylindrical portion, a protrusion is arranged on the outer peripheral side wall of the cylindrical portion, and the protrusion can engage the operable component to move axially in a corresponding groove in the inner wall surface of the first internal push rod under the drive of the operable component to guide the movement of the slip ring component in the axial direction; and a proximal truncated cone portion, the truncated cone portion is used to engage the blocking mechanism to switch the blocking mechanism between a blocking state and a non-blocking state.

[0041] In some preferred embodiments, the blocking mechanism is positioned on the proximal side of the limiting mechanism and includes: an elastic ring piece component, which is arranged in the first internal push rod and is sleeved on the storage container, and the elastic ring piece component can engage with the truncated cone portion of the distal sliding ring component; and a mounting component for fixing the elastic ring piece component to the first internal push rod, the mounting component includes a distal tubular element and a proximal annular limiting element, wherein the tubular element is clamped in a correspondingly arranged fixing groove in the first internal push rod and can be fixedly connected to the elastic ring piece component, and wherein the annular limiting element is adjacently arranged on the proximal side of the tubular element for limiting the axial movement of the tubular element.

[0042] In some preferred embodiments, the elastic annular component includes a plurality of elastic elements arranged continuously in a circumferential direction, each elastic element including: a fixed portion, which is located radially outside and is used to fix the elastic element to the distal edge of the tubular element; and a deformable portion, which can be elastically deformed so that the angle between the deformable portion and the fixed portion can be switched between a first angle and a second angle.

[0043] In some preferred embodiments, when the sliding ring component of the limiting mechanism is located at the distal first position, the truncated cone portion does not engage the annular component, and the angle between the deformable portion and the fixed portion of each of the multiple elastic elements is a first angle, at which time the radially inner end of the deformable portion contacts and interferes with the storage container; when the sliding ring component of the limiting mechanism moves proximally to the second position, the truncated cone portion biases the deformable portion of each of the multiple elastic elements toward the radial outside, so that the angle between the deformable portion and the fixed portion of each of the multiple elastic elements is converted from the first angle to the second angle, at which time the radially inner end of the deformable portion does not contact the storage container, and wherein the first angle is greater than the second angle.

[0044] In some preferred embodiments, the radial inner ends of the deformable parts of the multiple elastic elements jointly form an opening portion of the elastic annular component, wherein, when the angle between the deformable part and the fixed part of each of the multiple elastic elements is a first angle, the opening portion has a first diameter; wherein, when the angle between the deformable part and the fixed part of each of the multiple elastic elements is a second angle, the opening portion has a second diameter, and wherein the second diameter is greater than the first diameter.

[0045] In some preferred embodiments, the projection includes a hole configured to be engageable by an operating rod of the operable component.

[0046] In some preferred embodiments, a second through slot is provided at a position on the first inner push rod corresponding to the protrusion, and when the slip ring component moves between the first position and the second position, the second through slot allows the hole of the protrusion to be exposed to the operating rod.

[0047] In some preferred embodiments, the cylindrical portion of the slip ring component includes two symmetrically arranged protrusions, and correspondingly, the first inner push rod includes two symmetrically arranged second through grooves.

[0048] In some preferred embodiments, the operable component is arranged on the external housing and is constructed as a push-type operable component, and the linkage mechanism includes a rocker rod and an elastic element accommodated inside and held by the first internal push rod.

[0049] In some preferred embodiments, a through slot for accommodating and retaining the rocker arm and the elastic element is formed at a position near the distal end of the circumferential side wall of the first inner push rod, wherein the rocker arm is pivotally mounted to the through slot.

[0050] In some preferred embodiments, the rocker arm includes a pin rod arranged at an approximately middle position of the rocker arm, and the rocker arm is mounted to the through slot through the pin rod, wherein the through slot includes two opposite side walls extending in an axial direction, each side wall having a mounting hole formed therein for accommodating and fixing the end of the pin rod, and wherein the rocker arm can pivot around the pin rod in the through slot.

[0051] In some preferred embodiments, the rocker arm includes a first leg located proximal to the pin rod and a second leg located distal to the pin rod, wherein one of the first leg and the second leg is capable of switching from a first state of radially interfering with the storage container to a second state of not interfering with the storage container in response to the operable part being pressed by an operator to move from a locked position toward an unlocked position.

[0052] In some preferred embodiments, the second leg of the rocker arm can switch from a first state of radially interfering with the storage container to a second state of not interfering with the storage container in response to the operable part being pressed by the operator to move from a locked position toward an unlocked position, and wherein the second leg of the rocker arm includes a protrusion extending radially inward from the radial inner surface of the second leg, and the protrusion is configured to radially interfere with the storage container when the second leg of the rocker arm is in the first state, and not interfere with the storage container when the second leg is in the second state.

[0053] In some preferred embodiments, the elastic element is configured to bias the second leg of the rocker toward a first state of radially interfering with the storage container.

[0054] In some preferred embodiments, the through groove of the first internal push rod for accommodating and retaining the rocker arm is a third through groove, the third through groove comprising a first portion on the proximal side and a second portion on the distal side whose width is smaller than that of the first portion, wherein the elastic element is arranged between the radial outer surface of the second leg of the rocker arm and the radial inner surface of the circumferential side wall of the first internal push rod at the second portion of the third through groove, and is capable of biasing the second leg of the rocker arm along the radial inner direction toward a position that radially interferes with the storage container.

[0055] In some preferred embodiments, the operable component is capable of engaging the first leg of the rocker arm to allow the first leg of the rocker arm to move radially inward when the operator presses the operable component, so that the rocker arm overcomes the biasing force of the elastic element and pivots around the pin rod to a position where the protrusion of the second leg of the rocker arm does not interfere with the storage container.

[0056] In some preferred embodiments, the second portion of the third through slot includes a bottom wall, which is constructed so that when the second leg of the rocker arm is in the first state, the distal end of the second leg can overlap the bottom wall, and wherein the bottom wall does not contact the protrusion of the rocker arm.

[0057] In some preferred embodiments, the first leg and the second leg of the swing arm extend substantially parallel to each other.

[0058] In some preferred embodiments, the first leg of the rocker arm is capable of switching from a first state of radially interfering with the storage container to a second state of not interfering with the storage container in response to the operable part being pressed by an operator to move from a locked position toward an unlocked position, and wherein the proximal end of the first leg of the rocker arm is configured to be able to radially interfere with the storage container when the first leg of the rocker arm is in the first state, and to not interfere with the storage container when the first leg is in the second state.

[0059] In some preferred embodiments, the elastic element is configured to bias the second leg of the swing lever toward the radially outer side so that the swing lever pivots around the pin at a position where the proximal end of the first leg of the swing lever can radially interfere with the storage container.

[0060] In some preferred embodiments, the through groove of the first internal push rod for accommodating and retaining the rocker arm is a fourth through groove, the fourth through groove comprising a proximal first portion and a distal second portion, wherein the first portion of the fourth through groove allows the first leg of the rocker arm to pass therethrough and radially interfere with the storage container, and wherein the second portion of the fourth through groove is provided with a bottom wall, and the elastic element is retained between the bottom wall and the radial inner surface of the second leg of the rocker arm.

[0061] In some preferred embodiments, the operable component is capable of engaging the second leg of the rocker arm so that when the operator presses the operable component, the second leg of the rocker arm is capable of overcoming the biasing force of the elastic element and moving radially inward, so that the rocker arm pivots around the pin rod to the proximal end of the first leg of the rocker arm without interfering with the position of the storage container.

[0062] In some preferred embodiments, an obtuse angle is formed between the first leg and the second leg of the rocker toward the radial inner side.

[0063] In some preferred embodiments, one or more through grooves are formed in the circumferential side wall of the first inner push rod along the circumferential direction, and each through groove accommodates and retains the rocker rod and the elastic element.

[0064] In some preferred embodiments, the elastic element is a tension spring.

[0065] In some preferred embodiments, the operable component is arranged on the external shell and is constructed as a press-type operable component, wherein the limiting mechanism is constructed to be able to move in a vertical radial direction between an upper first position and a lower second position in response to the movement of the operable component between a locked position and an unlocked position in a vertical radial direction, and wherein the blocking mechanism is constructed to be able to switch between a closed blocking state and an open non-blocking state in response to the movement of the limiting mechanism between the first position and the second position.

[0066] In some preferred embodiments, the limiting mechanism includes a snap ring that can be engaged by the operable component, so that when the operator presses the operable component downward, the snap ring moves downward.

[0067] In some preferred embodiments, the snap ring can be mounted above the storage container and on the radially outer side of the storage container, wherein the snap ring includes a top that can be engaged by an operable component and two arms that extend from the top toward both sides and are generally arc-shaped, and the end of each of the two arms away from the top includes a guide groove for engaging a blocking mechanism and guiding the movement of the blocking mechanism, and wherein the guide groove extends in a horizontal radial direction.

[0068] In some preferred embodiments, the first internal push rod is formed with a groove for accommodating the retaining ring, and the groove matches the shape of the retaining ring so that the retaining ring can move in the vertical radial direction between a first position and a second position in the groove, wherein the groove includes two guide portions extending in the vertical radial direction, each guide portion accommodating one of the two ends of the two arms of the retaining ring away from the top, and allowing the end to move up and down in the vertical radial direction therein.

[0069] In some preferred embodiments, the slot of the first inner push rod includes a first tongue portion extending distally from a proximal surface of the slot extending perpendicular to the axial direction, and the first tongue portion is located directly below the top of the snap ring.

[0070] In some preferred embodiments, the limiting mechanism further includes an elastic element, which abuts between a hole opened in the bottom surface of the top of the snap ring and the top surface of the first tongue portion, and is configured to bias the snap ring upward.

[0071] In some preferred embodiments, the blocking mechanism includes two swing arms that are generally arc-shaped, and each swing arm is pivotally connected to the first inner push rod through a bottom end portion of the swing arm.

[0072] In some preferred embodiments, a guide pin is provided at approximately the middle position of each swing arm, and the guide pin can move along the guide groove of the arm portion of the retaining ring located on the same side, wherein, when the retaining ring is located at the upper first position, each guide pin is located at the radially inner end of the corresponding guide groove, so that the two swing arms together form a closed blocking state, in which the two swing arms radially interfere with the storage container; and wherein, when the operator presses the operable component to move the retaining ring downward to the second position, the retaining ring drives the corresponding guide pin to move to the radially outer end of the guide groove through each guide groove, so that the two swing arms move radially outward to jointly form an open non-blocking state, in which the two swing arms do not interfere with the storage container.

[0073] In some preferred embodiments, the retaining device further comprises an annular limiting element for limiting the axial position of the blocking mechanism and the limiting mechanism.

[0074] In some preferred embodiments, the limiting element is located at the distal side of the blocking mechanism and the limiting mechanism to prevent the blocking mechanism and the limiting mechanism from moving distally and disengaging from the first inner push rod.

[0075] In some preferred embodiments, the blocking mechanism is located on the distal side of the limiting mechanism, and the limiting element includes: an annular flange extending proximally, the annular flange being capable of resisting the two swing arms distally; and a second tongue portion extending proximally beyond the annular flange, the second tongue portion being capable of resisting the top of the snap ring distally when the snap ring is in the upper first position.

[0076] According to another aspect of the present invention, a needle-free syringe is provided, which includes a syringe body and a storage container located in an external shell of the syringe body, and the storage container can be removably installed in the needle-free syringe, wherein the syringe body includes: an external shell and a tubular first internal push rod in the external shell, and is characterized in that the needle-free syringe also includes: a retaining device for the storage container according to any one of the aforementioned schemes, the retaining device being configured to prevent the storage container from being installed into or removed from the needle-free syringe in a locked state, or to allow the storage container to be installed into or removed from the needle-free syringe.

[0077] In some preferred embodiments, the needle-free injector further comprises an injection head that can be removably mounted to the injector body, and a distal end of the injection head comprises an injection micro-hole.

[0078] In some preferred embodiments, the storage container is a cartridge.

[0079] In some preferred embodiments, the linkage mechanism is maintained by a tubular first internal push rod within the external shell of the syringe body, and the storage container can be accommodated inside the first internal push rod, wherein the first internal push rod includes a first hollow portion formed on the circumferential side wall, and the external shell includes a second hollow portion aligned with the first hollow portion in the circumferential direction, and the first hollow portion and the second hollow portion together form a viewing window for an operator to observe the storage container.

[0080] In some preferred embodiments, the operable component can be mounted in a recessed portion of a circumferential side wall of an outer shell of the syringe body, and the first hollow portion and the second hollow portion have an elongated shape extending in an axial direction, and wherein the second hollow portion is located proximal to the recessed portion.

[0081] In some preferred embodiments, the needle-free syringe further comprises a cover which can be engaged with the outer shell of the needle-free syringe to cover the recessed portion and the second hollow portion, and wherein the cover comprises a window, and when the cover is closed on the outer shell, the operator engagement portion of the operable component can be exposed to the operator through the window.

[0082] By means of the retaining device and the needle-free syringe according to the present invention, the built-in medicine storage bottle can be freely installed and removed in the syringe, and the built-in medicine storage bottle can be easily taken out and placed without using a separate tool, which provides convenience for the operator to use the needle-free syringe. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. The same or similar reference numerals in the accompanying drawings refer to the same or similar components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0084] Figure 1 A perspective view of a needle-free injector according to a preferred embodiment of the present invention is shown.

[0085] Figure 2 Shows Figure 1 An exploded view of the needle-free syringe is shown.

[0086] Figure 3 Shows Figure 1 An exploded view of the relevant parts of the injection head of the needle-free syringe is shown.

[0087] Figures 4 to 6 Shows Figure 1 A perspective view of the components inside the outer housing of the needle-free injector is shown.

[0088] Figure 7 Shows Figure 1 Schematic diagram of the cooperation between the outer shell and the cover of the needle-free syringe.

[0089] Figures 8 to 9 Shows Figure 1 A schematic diagram of the distal portion of the outer housing of the needle-free injector is shown, showing the recessed portion of the outer housing that cooperates with the cap.

[0090] Fig.10 A preferred embodiment of the present invention is shown. Figure 1 A perspective view of the operable components of the retaining device of the needle-free injector is shown.

[0091] Fig.11 A preferred embodiment of the present invention is shown. Figure 1 A perspective view of the linkage mechanism of the holding device of the needle-free syringe is shown.

[0092] Figures 12 to 13 Shows Fig.11 A perspective view of the blocking mechanism of the linkage mechanism shown.

[0093] Fig.14 Shows Fig.11 A three-dimensional view of the limiting mechanism of the linkage mechanism shown.

[0094] FIG. 15A to FIG. 15B They are shown respectively Fig.11 Schematic diagram of the linkage mechanism in a first state and a second state.

[0095] FIG. 16A to FIG. 16B They are shown respectively FIG. 15A to FIG. 15B A partial enlarged view of the linkage mechanism.

[0096] Fig.17 A perspective view of a second inner push rod according to a preferred embodiment of the present invention is shown.

[0097] Fig.18 A perspective view of a base of a storage container according to a preferred embodiment of the present invention is shown.

[0098] Fig.19 A perspective view showing a base of a storage container according to a preferred embodiment of the present invention viewed from another direction is shown.

[0099] Figures 20 to 22 A schematic diagram of a holding device according to another preferred embodiment of the present invention is shown.

[0100] Figures 23 to 25 A schematic diagram of a holding device according to another preferred embodiment of the present invention is shown.

[0101] Figures 23 to 25 A schematic diagram of a holding device according to another preferred embodiment of the present invention is shown.

[0102] Figures 26 to 29 A schematic diagram of a holding device according to another preferred embodiment of the present invention is shown.

[0103] Figures 30 to 36 A schematic diagram of a holding device according to another preferred embodiment of the present invention is shown. DETAILED DESCRIPTION

[0104] Hereinafter, a holding device for a storage container and a needle-free syringe according to the present invention will be described in detail with reference to the accompanying drawings, wherein the needle-free syringe is provided with the holding device. The following are only preferred embodiments according to the present invention, and those skilled in the art may think of other ways to implement the present invention based on the preferred embodiments, and the other ways also fall within the scope of the present invention.

[0105] The present invention provides a holding device for a storage container, which can be removably installed in a needle-free syringe and used in conjunction with the needle-free syringe. The holding device is configured to be switchable between a locked state and an unlocked state, wherein in the locked state, the holding device can prevent the storage container from being installed on the syringe body of the syringe or being removed from the syringe body; and in the unlocked state, the holding device can allow the storage container to be installed on the syringe body or be removed from the syringe body.

[0106] In order to better describe the holding device according to the present invention and to facilitate understanding, the overall structure of the needle-free syringe is first introduced below.

[0107] First of all, it should be noted that the directional terms and positional terms mentioned in the present invention should be understood as relative directions and relative positions. The directional terms and positional terms mentioned in the present invention can be understood with reference to the accompanying drawings. For example, the "axial direction", "axial direction (X)" and the like mentioned in the present invention can be understood as directions parallel or substantially parallel to the longitudinal center axis of the syringe, that is, along the XX direction in the accompanying drawings or parallel to the XX direction in the accompanying drawings; the "radial direction", "radial direction", "upper", "lower", "circumferential direction", "circumferential direction" and the like mentioned in the present invention are all directions defined about the XX axis, for example, the radial outer direction represents the direction away from the longitudinal center axis of the syringe, the radial inner direction represents the direction toward the longitudinal center axis of the syringe, the up and down movement refers to the movement back and forth along a specific radial direction, and the circumferential direction represents the direction around the longitudinal center axis of the syringe; the "rotational direction" mentioned in the present invention can be understood as the direction of rotation around the XX axis, which is roughly equivalent to the "circumferential direction". The “near”, “proximal”, “proximal end”, “proximal direction”, “rear”, “rear side”, “rear end”, “rear direction” etc. mentioned in the present invention are the direction along the axis XX or the direction parallel to the axis XX and close to the operator's hand (considering that the operator holds the syringe to inhale and inject the medicine); the “distal”, “distal end”, “distal direction”, “front”, “front side”, “front end”, “front direction” etc. mentioned in the present invention are the direction along the axis XX or the direction parallel to the axis XX and away from the operator's hand, and are also the direction in which the injection is ejected in the injection step.

[0108] Overall structure

[0109] Figure 1 shows an overall stereoscopic view of a needle-free syringe according to some preferred embodiments of the present invention, Figure 2 Shows Figure 1Schematic diagram of the exploded view of the syringe. The syringe in this embodiment is a needle-free syringe. Unlike the traditional syringe with a needle, the needle-free syringe does not inject through a needle, but an injection micropore is set at the farthest end of the injection head. During injection, the substance to be injected is quickly ejected through the micropore to be injected into the patient's body. It should be pointed out that this article uses medicines, liquid medicines and other injectables as examples to describe the concept of the present invention, but this is only an example and is not restrictive. The substance to be injected can be various other types, such as physiological saline, glucose, solid particles, etc. As long as it is an injectable substance that can be injected into the human body by the needle-free syringe of the present invention, it falls within the protection scope of the present invention. The present invention does not limit the form and type of the substance to be injected.

[0110] refer to Figures 1 to 6 According to the preferred embodiment, the syringe 1 comprises the following components: an injection head 2, a syringe body 3, and a storage container 4. Each component can be packaged separately before use and assembled together when used.

[0111] The injection head 2 includes: a medicine tube 21, which is used to accommodate the liquid medicine to be injected drawn from the storage container 4; an end cap 23, which can be removably matched with the distal part of the medicine tube, so as to keep covering the medicine tube in the process of drawing medicine described below, so as to seal the injection micropore at the distal end of the medicine tube, and is removed to expose the injection micropore during the injection process; and a piston rod 22, which can move relative to the medicine tube 21 in the axial direction X inside the medicine tube 21, so as to draw the liquid medicine in the storage container 4 into the medicine tube during the process of drawing medicine, and push the injection material in the medicine tube 21 through the injection micropore of the medicine tube during the injection process, so that the liquid medicine is ejected through the micropore to complete the injection. The storage container 4 can be a container for storing medicines, for example, it can be a cartridge bottle according to national standards. The storage container 4 according to the present invention is built-in and can be removably installed in the syringe 1 (specifically installed in the syringe body 3) to be used in conjunction with the syringe body 3 and the injection head 2.

[0112] The syringe body 3 includes an outer shell 32, a rear shell 31, a first inner push rod 33, and a second inner push rod 34. The outer shell 31 accommodates various components in the syringe body, and is provided with an outer thread at the proximal end of the outer shell for cooperating with the inner thread at the distal end of the rear shell 31, so that the operator can rotate the rear shell 31 or the outer shell 32 to make the two move relative to each other in the axial direction. Figure 2 , Figure 4 and Figure 5The outer housing 32 contains a first inner push rod 33 and a second inner push rod 34 located near the first inner push rod, wherein the first inner push rod 33 is used to accommodate the storage container 4, so as to carry the storage container during the entire operation process to drive the storage container to move. The two inner push rods 33 and 34 are fixed to each other (for example, by threaded engagement), and can be locked or unlocked with the rear housing 31 by engagement between a locking component (not shown) located near the second inner push rod 34 and a locking mechanism 35 (the locking mechanism 35 is fixedly disposed on the rear housing 31).

[0113] The injection head 2 may be removably mounted to the syringe body 3. Specifically, refer to Figure 2 and Figure 3 , the medicine tube 21 of the injection head 2 can be fixedly mounted to the external shell 32, for example, by the cooperation between the external thread of the proximal part of the medicine tube 21 and the internal thread of the external shell 32 near the distal opening. During the entire operation process after the fixed installation, the medicine tube 21 remains fixed to the external shell 32, and the movement of the medicine tube 21 is driven by the external shell 32, and there is no relative movement between the two. The piston rod 22 of the injection head 2 can be fixedly mounted to the above-mentioned first internal push rod 33 or to other components fixedly connected to the first internal push rod 33. For example, Figure 3 As shown, the proximal end of the piston rod 22 may include an elastic buckle portion 221 extending proximally along the axial direction X, and the buckle portion 221 may be engaged with the piston rod 22. Fig.13 The first annular component 5221 shown (the proximal end of the first annular component is fixed to the first internal push rod 33, which will be described in detail below) is fixed. During the entire operation process after fixed installation, the piston rod 22 remains fixed to the first annular component, and then remains relatively fixed to the first internal push rod 33. The piston rod 22 is driven by the first internal push rod 33 to move in the axial direction.

[0114] The operation process after the installation of the syringe according to the present invention mainly includes the following steps: a pressurization and energy storage step, a medicine suction step, an exhaust step, and an injection step.

[0115] First, in the pressurization and energy storage step, initially, the actuation spring 39 located between the outer housing 32 and the rear housing 31 on the proximal side of the syringe is in an extended state, so that the outer housing 32 is located at a distal position relative to the rear housing 31. When the pressurization and energy storage starts, the operator rotates the outer housing 32 to make it move proximally relative to the rear housing 31 (realized by the threaded fit between the two). During this process, the distal portion of the outer housing 32 can exert force on the distal portion (e.g., the distal flange 33a) of the first internal push rod 33, thereby simultaneously driving the first internal push rod 33 and the second internal push rod 34 to move in the proximal direction. When the outer housing 32 is screwed tight relative to the rear housing 31, the locking component (not shown) located on the proximal side of the second internal push rod 34 and the locking mechanism 35 are locked with each other, thereby locking the first and second internal push rods 33 and 34 to the rear housing 31. During this process, the actuation spring 39 is compressed and energized to prepare for the final injection step.

[0116] The step of pressurizing and storing energy is followed by the step of inhaling medicine. In the step of inhaling medicine, the operator rotates the outer shell 32 to make it move distally relative to the rear shell 31 (still achieved by the threaded fit between the two), and at this time, the first and second internal push rods 33 and 34 are locked by the locking mechanism 35 and thus remain fixed relative to the rear shell 31, that is, in this process, the outer shell 32 moves distally relative to the first and second internal push rods 33 and 34. Since the medicine tube 21 is fixed relative to the outer shell 32, and the storage container 4 and the piston rod 22 are fixed relative to the first internal push rod 33, the medicine tube 21 moves distally relative to the storage container 4 and the piston rod 22. Furthermore, since the injection micropore at the distal end of the medicine tube 21 is closed by the cap 23 (for example, a sealing gasket is provided in the cap 23 for sealing the injection micropore when the cap is closed on the medicine tube 21), when the medicine tube 21 moves distally relative to the piston rod 22, the distal part of the inner cavity of the medicine tube 21 (that is, the chamber between the distal end of the piston rod and the distal end of the medicine tube) forms a accommodating chamber, and the pressure in the accommodating chamber is relatively small, so that the liquid in the storage container 4 can be sucked into the accommodating chamber 215 through the needle 24 contained in the medicine liquid channel in the piston rod 22, thereby completing the drug absorption.

[0117] The drug inhalation step is followed by the exhaust step, which is an injection preparation step, the purpose of which is to exhaust the gas that may be mixed in the medicine tube 21 before injection. In this step, the cap 23 is first removed to expose the injection micropore at the distal end of the medicine tube 21. Then, the outer shell 32 is rotated to move slightly backward relative to the rear shell 31. During this process, since the locking mechanism 35 is still in a locked state, the first internal push rod 33 and the piston rod 22 remain fixed relative to the rear shell 31. In this way, the medicine tube 21 (fixed relative to the outer shell 32) actually moves slightly proximally relative to the piston rod 22 (fixed relative to the first internal push rod 33), and the piston rod 22 slightly compresses the accommodating cavity in the medicine tube 21, so that the gas in the accommodating cavity can be discharged from the injection micropore under the action of pressure.

[0118] Finally, there is the injection step. In this step, the outer housing 32 and the medicine tube 21 are fixed relative to the rear housing 31, and the operator operates the locking mechanism 35 (for example, pressing the button 351 at the proximal end of the syringe) to release the locking state between it and the locking component (not shown) located proximal to the first and second internal push rods, allowing the second internal push rod 34, the first internal push rod 33, the storage container 4 and the piston rod 22 to move rapidly distally relative to the rear housing 31 under the rebound action of the actuating spring 39, so that the injection is completed by the piston rod 22 quickly squeezing the liquid in the accommodating cavity in the medicine tube 21.

[0119] Holding device

[0120] For the syringe as described above, after completing the injection step, the operator can disassemble the components of the syringe for storage.

[0121] Usually, the built-in storage container 4 as described above can only be installed into or removed from the syringe body 3 together with the injection head 2 including the medicine tube 21 and the piston rod 22, and the storage container 4 cannot be removed separately. When the storage container needs to be replaced, it is difficult for the operator to flexibly take and place the medicine storage bottle separately, resulting in many inconveniences such as difficulty in changing medicines.

[0122] In order to at least partially solve the above problems, the present invention provides a retaining device 5 that facilitates the replacement of the above storage container 4. The retaining device is configured to be switchable between a locked state and an unlocked state, wherein in the locked state, the retaining device can prevent the storage container from being installed on the syringe body of the syringe or being removed from the syringe body; and in the unlocked state, the retaining device can allow the storage container to be installed on the syringe body or be removed from the syringe body. The retaining device 5 according to the present invention is described in detail below.

[0123] First of all, it should be noted that the reference Figure 5 to Figure 6In the installation and removal process of the storage container 4 discussed below, the injection head 2 is not installed on the syringe body 3, so as not to hinder the installation and removal of the storage container 4. For example, in the assembly step, the operator first switches the retaining device 5 to the unlocked state, and then inserts the storage container 4 into the first internal push rod 33 in the outer shell 32 in the proximal direction through the distal opening of the outer shell 32 and the distal opening of the first internal push rod 33, and then installs the injection head 2. In the removal step, the operator first removes the injection head 2 from the syringe body 3, so as not to block the distal opening of the outer shell 32 and the distal opening of the first internal push rod 33, and then switches the retaining device 5 to the unlocked state, and removes the storage container 4 from the first internal push rod 33 in the outer shell 32 in the distal direction through the distal opening of the outer shell 32 and the distal opening of the first internal push rod 33.

[0124] Next reference Figures 7 to 14 , the retaining device 5 is described in detail. The retaining device includes: an operable component 51, which can be operated by an operator to move between the locked position and the unlocked position of the operable component to switch the retaining device between the locked state and the unlocked state; and a linkage mechanism 52, which is configured to switch between a first state and a second state in response to the movement of the operable component 51 between the locked position and the unlocked position. When the operable component 51 is in the locked position, the linkage mechanism 52 is in a first state, in which the linkage mechanism 52 can prevent the storage container 4 from being installed to the syringe body 3 or being removed from the syringe body (for example, the linkage member can interfere with the storage container 4 in the radial direction to prevent the axial movement of the storage container 4. This will be discussed in detail below), and wherein, when the operable component 51 is in the unlocked position, the linkage mechanism 52 is in a second state, in which the linkage mechanism 52 allows the storage container 4 to be installed to the syringe body 3 or be removed from the syringe body. In this embodiment, the linkage mechanism is held by the first internal push rod 33 in the outer shell 32.

[0125] refer to Figures 8 to 10 In this embodiment, the operable component is arranged on the outer housing 32, and is preferably configured as a push-type operable component. The operable component 51 can be installed in a recessed portion 321 opened on the circumferential side wall of the outer housing 32 of the syringe body 3, and the operable component 51 can move between a locked position and an unlocked position in the recessed portion 321 relative to the outer housing along the axial direction X.

[0126] In this embodiment, the locking position of the operable component 51 is located at the far side of the unlocking position. The operable component 51 includes a base 511, an operator engaging portion 512, a sliding portion 513, and a protruding portion 514. The base 511 extends along the axial direction X, and the base is generally plate-shaped, providing a foundation for setting other parts and structures of the operable component 51. The operator engaging portion 512 extends outward from the radial outer surface of the base 511 in the radial direction, and is configured to be able to protrude outward from the outer shell 32, so that it can be engaged by the operator to operate the operable component 51 to move between the locking position and the unlocking position. The operator engaging portion 512 can be various buttons that can be thought of by those skilled in the art, such as a toggle button, a push button, etc. The sliding portion 513 extends inward from the radial inner surface of the base 511 in the radial direction, and the radial inner surface of the sliding portion can contact and substantially fit with the radial outer surface of the bottom wall 3211 of the recessed portion 321 of the outer shell 32, so as to move along the axial direction X on this surface. The protrusion 514 extends inwardly from the radial inner surface of the sliding portion 513 in the radial direction, and protrudes from the opening 32111 at the corresponding position of the bottom wall 3211 of the recessed portion 321 toward the radial inner side of the outer housing 32. The opening 32111 extends in the axial direction X, and allows the protrusion to move back and forth therein in the axial direction X, and wherein the protrusion 514 protruding radially inwardly from the opening can engage with the linkage mechanism 52 located inside the outer housing 32, so that the linkage mechanism switches between the above-mentioned first state (at this time, the protrusion is located in the distal position, and the linkage mechanism locks the storage container 4) and the second state (at this time, the protrusion is located in the proximal position, and the linkage mechanism unlocks the storage container 4) in response to the movement of the protrusion 514 in the opening 32111 of the recessed portion 321 in the axial direction X.

[0127] Furthermore, in order to keep the operable component 51 in a locked state when not being operated by the operator, a corresponding biasing mechanism is provided for the operable component 51. Specifically, the sliding portion 513 of the operable component includes a columnar component 5131 extending along the axial direction X, and the end wall of the recessed portion perpendicular to the axial direction X is provided with a hole 32121 aligned with the columnar component 5131 (that is, the columnar component 5131 and the hole 32121 are located in the same position in the circumferential direction, and the axes of the two are aligned or approximately aligned with each other), the columnar component 5131 extends from the proximal end surface of the sliding portion 513 toward the proximal side, and the hole 32131 is provided in the proximal end wall 3212 of the recessed portion 321. A first spring 53 extending in the axial direction X is provided between the columnar component 5131 and the hole 32121, and the first spring includes: a first end 531 accommodated and restricted in the hole 32121 of the end wall 3212 of the recessed portion; and a second end 532 sleeved on the outer peripheral side of the columnar component 5131. The first spring 53 can bias the operable component 51 toward the locked position through the columnar component 5131. When the operator needs to unlock the retaining device, the operator engaging portion 512 can be pushed or toggled to move the operable component 51 toward the proximal direction to the unlocked position, and at this time, the columnar component 5131 compresses the first spring 53 toward the proximal side.

[0128] Further, in order to promote the movement of the operable component 51 in the axial direction and ensure that it does not deviate, a guide device is also provided. The guide device includes a first guide engagement portion extending in the axial direction X and arranged in the recessed portion 321 of the outer housing 32, and a corresponding second guide engagement portion extending in the axial direction X and arranged in the sliding portion 513 of the operable component. The first guide engagement portion and the second guide engagement portion are configured to cooperate with each other to guide the movement of the sliding portion 513 of the operable component in the recessed portion 321 of the outer housing.

[0129] In this embodiment, the first guide engagement portion is a guide column 322 extending in the axial direction X and fixedly disposed in the recessed portion 321 of the external housing, and the second guide engagement portion is a through hole 5132 extending in the axial direction X and provided in the sliding portion, and each through hole 5132 is matched in shape and position with the corresponding guide column 322, thereby allowing the sliding portion 513 to move in the axial direction X through the axial movement of each through hole on the corresponding guide column. It can be imagined that the guide device is not limited to the form of the guide column and the through hole provided in this embodiment, and those skilled in the art can adopt other structures according to actual needs, as long as they can play a guiding role in the axial movement of the operable component 51 relative to the recessed portion 321. In addition, Figures 8 to 10In the illustrated embodiment, two through holes 5132 are provided, and the two through holes are respectively opened at positions close to the two ends of the sliding part parallel to the axial direction X, and are located on both sides of the guide column 322. Correspondingly, two guide columns are also provided, which are respectively located at positions on the recessed part corresponding to the circumferential positions of the two through holes of the sliding part. Those skilled in the art can adjust the positions and numbers of the guide columns and the through holes according to actual needs.

[0130] In order to fix the guide column 322 to the recessed portion 321, the two ends of each guide column in the axial direction X are respectively accommodated and fixed in two U-shaped fixing members 323 extending radially outward from the radial outer surface of the bottom wall 3211 of the recessed portion 321, and the two U-shaped fixing members are configured to jointly limit the movement of the guide column, that is, to prevent the guide column from moving in the axial direction and the circumferential direction.

[0131] Further, refer to Figure 5 and Figure 7 , the first internal push rod 33 includes a first hollow portion 331 formed on the circumferential side wall, and the outer shell 32 includes a second hollow portion 322 aligned with the first hollow portion in the circumferential direction of the syringe, and the first hollow portion 331 and the second hollow portion 322 together form a visual window for the operator to observe the storage container 4. The first hollow portion 331 and the second hollow portion 322 both have an elongated shape extending along the axial direction X, and the second hollow portion is located on the proximal side of the recessed portion 321. The syringe 1 also includes a cover 6 that can be engaged with the outer shell 32 of the syringe body 3 to cover the recessed portion 321 and the second hollow portion 322. The cover 6 includes a window 61, and when the cover is covered on the outer shell 32, the operator engagement portion 512 of the operable component 51 can protrude from the outer shell 32 through the window, thereby being exposed to the operator so as to be able to be operated by the operator.

[0132] Figures 11 to 14 FIG. 5 shows a linkage mechanism 52 according to a preferred embodiment of the present invention. Fig.11The linkage mechanism 52 includes a limiting mechanism 521 and a blocking mechanism 522. The limiting mechanism is configured to move along the axial direction X between a first position and a second position in response to movement of the protrusion 514 of the operable component 51 in the opening 32111 of the recess 321 of the external housing along the axial direction X. In this embodiment, the first position is located distally relative to the second position, that is, when the operable component 51 is located at the distal locking position, the protrusion 514 is located at the distal position, and the limiting mechanism 521 of the linkage mechanism 52 is located at the distal first position. The limiting mechanism 521 in the first position keeps the blocking mechanism 522 in a blocking state, so that the blocking mechanism 522 can interfere with the storage container 4 in the radial direction to prevent the storage container from being installed on the syringe body or removed from the syringe body; when the operable component 51 is operated to the proximal unlocking position, the protrusion 514 is located at the proximal position, and the limiting mechanism 521 of the linkage mechanism 52 is pushed to the proximal second position by the protrusion 514, and the limiting mechanism 521 in the second position switches the blocking mechanism 522 to a non-blocking state, so that the blocking mechanism 522 no longer interferes with the storage container 4 to allow the storage container to be installed on the syringe body or removed from the syringe body.

[0133] refer to Figure 12 to Figure 13 The blocking mechanism 522 includes a first annular component 5221, which includes a blocking portion 52211. The blocking portion is provided with a through hole 52212 extending in the radial direction, and a ball 5222 is accommodated in the through hole. The diameter of the through hole 52212 is not smaller than that of the ball, so as to allow the ball 5222 to move back and forth in the radial direction along the inner wall surface of the through hole. Fig.13 As shown (in order to clearly show the structure of the through hole, the ball in the through hole is not shown), the through hole 52212 includes: a first opening end 522121 located radially inside, a second opening end 522122 located radially outside, and an annular first flange 522123 extending from the inner wall surface of the through hole to the inside of the through hole at the first opening end, and the size of the first flange is constructed to: allow at least a portion of the ball 5222 to protrude radially inward from the first opening end 522121 of the through hole 52212 to the extent of radial position interference with the storage container 4, while preventing the ball from continuing to move radially inward and detaching from the through hole from the first opening end 522121.

[0134] Preferably, the first annular component 5221 includes a plurality of through holes 52212 distributed in the circumferential direction, each of which accommodates a ball 5222. More preferably, the plurality of through holes 52212 are arranged at equal intervals.

[0135] Further, the first annular component 5221 further includes an engaging portion 52214 located at the distal side of the blocking portion 52211 of the first annular component, and the engaging portion is used to engage the proximal end of the piston rod 22 to be fixed to the piston rod. Preferably, the engaging portion 52214 of the first annular component is formed with a third annular groove 52213 close to the distal end of the first annular component, and wherein the proximal end of the piston rod is provided with an elastic buckle portion 221 (such as Figure 3 As shown), the buckle portion 221 can be buckled to the distal end surface 522131 of the third annular groove (as shown Fig.13 and Fig. 15B As shown), the piston rod 22 and the first annular component 5221 are fixed to each other.

[0136] Further, the proximal end of the first annular component 5221 is configured to be fixed to the distal end of the first internal push rod 33. For example, the proximal end of the first annular component 5221 is formed with an external thread, and the distal end of the first internal push rod 33 is formed with an internal thread that cooperates with the external thread of the first annular component 5221, so that the two can be fixed to each other through the thread.

[0137] refer to Fig.14 The limiting mechanism 521 includes a second annular component 5211 sleeved on the outer circumference of the first annular component 5221, and the second annular component is configured to be able to move along the axial direction X between a distal first position and a proximal second position in response to the movement of the protrusion 514 in the opening 32111 of the recessed portion 321 of the outer shell along the axial direction X. The second annular component 5211 includes an annular second flange 52111 extending radially inward from the inner wall surface of the second annular component.

[0138] When the second annular part 5211 is located at the first distal position (at this time, the operable part 51 is biased in the distal locking position by the first spring 53, and the protrusion 514 is in the distal position), the second flange 52111 is aligned with the through hole 52212 of the blocking mechanism 522 in the axial direction X. At this time, the radial inner surface of the second flange 52111 resists the ball 5222 in the through hole 52212 of the blocking mechanism to force at least a part of the ball to protrude radially inward from the first opening end 522121 of the through hole, thereby interfering with the storage container 4 in the radial direction. When the second annular component 5211 is in the second position (at this time, the operator pushes the operator coupling portion 512 proximally, so that the columnar component 5131 of the sliding portion 513 overcomes the biasing force of the first spring and compresses the first spring 53 proximally to switch the operable component to the unlocked position, and the protrusion 514 is in the proximal position), the second flange 52111 is staggered with the through hole 52212 of the blocking mechanism in the axial direction X to allow the ball 5222 to move freely radially outward to a position where it no longer protrudes radially inward from the first open end 522121 of the through hole, thereby no longer interfering with or blocking the storage container 4, so that the storage container 4 can be freely installed or removed.

[0139] Furthermore, the limiting mechanism 521 further includes a second spring 5212 (such as Fig.12 As shown in the figure, the second spring is positioned between the first annular component 5221 and the second annular component 5211, and is sleeved on the outer peripheral side of the first annular component 5221. The proximal end of the second spring 5212 abuts against the distal end surface of the first inner push rod 33, and the distal end of the second spring abuts against the proximal surface of the second flange 52111 of the second annular component 5211. The second spring 5212 is configured to bias the second annular component toward the above-mentioned first position on the distal side through the proximal end surface of the second flange 52111.

[0140] The distal side of the second flange 52111 of the second annular member 5211 is formed with an inclined surface 521111 (such as Fig.16A As shown), wherein, when the operator pushes the operable component 51 proximally so that the second annular component 5211 of the limiting mechanism 521 of the linkage mechanism 52 moves proximally from the above-mentioned first position to the above-mentioned second position along the axial direction X, the ball 5222 can move along the inclined surface 521111 of the second flange 52111 to a position where it no longer protrudes radially inward from the first opening end of the through hole (no longer blocks the storage container 4).

[0141] The second annular component 5211 further includes a third flange 52112, which is located at the distal portion of the second annular component 5211 and extends radially inward from the inner wall of the second annular component, and the third flange can slide on the outer peripheral surface of the distal portion of the first annular component 5221 during the movement of the second annular component 5211 in the axial direction. The second flange 52111 is located proximal to the third flange 52112, and a first annular groove 52113 is formed between the second flange and the third flange, and the first annular groove is configured to at least partially accommodate the ball 5222 when the second annular component 5211 is located at the second position.

[0142] In order to better explain the structure and principle of the holding device, refer to Figures 15A-15B as well as Figures 16A-16B ,in, Figures 16A-16B They are Figures 15A-15B 4 is a partial enlarged view of the retaining device 5. In these figures, the storage container 4 is shown to be located in the first internal push rod, so the following process of unlocking the retaining device is described by taking the removal of the storage container 4 from the syringe body 3 as an example. Of course, those skilled in the art should understand that the unlocking process when the storage container 4 is installed in the syringe body 3 is the same or similar, and will not be repeated here.

[0143] Fig.15A and Fig.16A The holding device 5 is shown to be in a locked state. At this time, the operable component 51 is biased by the first spring 53 to the distal locking position, and the linkage mechanism 52 is in a first state that prevents the storage container 4 from being removed. In the first state, the second annular component 5211 in the limiting mechanism 521 of the linkage mechanism is biased by the second spring 5212 to the distal first position. At this time, the radial inner surface of the second flange 52111 of the second annular component 5211 resists the ball 5222 in the through hole 52212 of the blocking mechanism, forcing at least a part of the ball to protrude radially inward from the first opening end 522121 of the through hole, thereby interfering with the storage container 4 in the radial direction (in this embodiment, the holding device is arranged at the distal part of the syringe body, so the ball 5222 blocks the distal part of the storage container 4), preventing the storage container 4 from being removed from the distal opening of the first inner push rod 3.

[0144] Fig. 15B and Fig. 16BThe retaining device 5 is shown to be in an unlocked state. At this time, the operator applies force to the operator engagement portion 512 so that the operable component overcomes the biasing force of the first spring 53 toward the distal side and moves toward the proximal side to the unlocked position. In this way, the linkage mechanism 52 is switched to a second state where the storage container 4 is no longer prevented from being removed. In this second state, the second annular component 5211 in the limiting mechanism 521 of the linkage mechanism overcomes the biasing force of the second spring 5212 toward the distal side under the push of the protrusion 514 of the operable component and moves toward the proximal side to the second position. At this time, the second flange 52111 of the second annular component 5211 is staggered with the through hole 52212 of the blocking mechanism in the axial direction X to allow the ball 5222 to freely move radially outward to a position where it no longer protrudes radially inward from the first open end 522121 of the through hole, thereby no longer interfering with or blocking the storage container 4, so that the storage container 4 can be freely removed.

[0145] In the embodiment described above, when the locking position of the operable component 51 and the limiting member 521 is located on the far side of the unlocking position, the present invention is not intended to limit the relative orientation between the unlocking position and the locking position. For example, a person skilled in the art may also adjust the retaining device as needed in actual use so that the locking position is located on the near side of the unlocking position. For example, the first spring 53 mentioned above may be replaced with a spring (for example, a tension spring replaced with a compression spring) that can hold the operable component 51 in the proximal position (biased toward the proximal position) through the columnar component 5131; or the first spring 53 and the columnar component 5131 are arranged in the distal part of the sliding portion 513 and the hole 32131 is arranged in the distal end wall of the recessed portion 321 accordingly. In addition, similarly, the second spring 5212 can be replaced with a spring that can maintain the second annular component 5211 in the proximal position (biased toward the proximal position) (for example, the tension spring is replaced with a compression spring and fixed to the corresponding structure of the proximal end of the second annular component 5211); or the second spring 5212 can be arranged on the distal side of the second annular component 5211 so that the proximal end abuts against the distal part of the second annular component, and the distal end is fixed to other components inside the external shell fixed relative to the first internal push rod, thereby biasing the second annular component to the proximal position.

[0146] Furthermore, in order to make it more convenient for the operator to remove the storage container from the syringe body 3, a structure for pushing the storage container out is also provided. Figures 15A to 15B as well as Figures 17 to 19Preferably, the holding device further comprises a base 36, which is located at the proximal end of the storage container and is configured to be in shape matching with the proximal end of the storage container, for accommodating and holding the proximal end of the storage container. A third spring 37 is also provided between the base 36 and the second internal push rod 34. As described above, the second internal push rod 34 is configured to be located proximal to the first internal push rod 33, and is fixed to each other with the first internal push rod 33 (for example, the internal thread of the distal end of the second internal push rod is fixed to the internal thread of the proximal end of the first internal push rod). The third spring 37 is configured to bias the base 36 toward the distal side along the axial direction X.

[0147] Specifically, refer to Fig.17 In a preferred embodiment, the second inner push rod 34 comprises: a first axial extension portion 341, the first axial extension portion comprises an elongated first through groove 3411 formed on the side wall and extending in the axial direction X, the first through groove extending to the distal end of the first axial extension portion 341; and a second axial extension portion 342 extending distally from the distal end of the first axial extension portion 341. An annular fourth flange 3412 extending radially inward from the inner wall surface of the first axial extension portion is provided at a substantially middle position of the first axial extension portion 341 in the axial direction X. The second axial extension portion 342 is used to engage with the proximal end portion (arranged with the above-mentioned internal thread) of the first inner push rod 33 to be fixed to the first inner push rod 33.

[0148] Matching the structure of the second inner push rod 34, refer to Figures 18 to 19 The base 36 comprises: a third axial extension portion 361, a distal portion of the third axial extension portion is provided with a tab 3611 extending distally, the tab corresponding to the first through slot 3411 of the second inner push rod 34, so that the tab can move in the axial direction X in the first through slot; and a fourth axial extension portion 362 extending distally from the distal end of the third axial extension portion 361. Preferably, the first axial extension portion of the second inner push rod 34 includes a plurality of first through slots 3411 uniformly distributed in the circumferential direction, and correspondingly, the third axial extension portion of the base includes a plurality of tabs 3611 corresponding to the positions of the first through slots and having the same number. In this embodiment, the diameter and the length of the second inner push rod in the axial direction can be minimized by removing part of the material on the side wall of the second inner push rod 34 to provide the through slot, thereby reducing the overall size of the syringe body and saving materials.

[0149] In addition to the above-mentioned matching structure of the through groove 3411 and the protrusion 3611, other matching methods can also be used to guide the axial movement of the base 36 in the second inner push rod 34. For example, the plurality of protrusions 3611 can be modified into a circle of annular boss portions extending uninterruptedly in the circumferential direction, and correspondingly, it is necessary to provide an additional circle of steps in the first axial extension portion 341 of the second inner push rod 34 (the step is, for example, at Fig.17 In order to provide the additional step, the first axial extension portion 341 of the second inner push rod 34 needs to be thickened or lengthened accordingly to provide space for the step.

[0150] The proximal end of the third spring 37 abuts against the distal surface of the fourth flange 3412 of the second inner push rod 34, and the distal end of the third spring abuts against the inner step surface 364 (such as the inner step surface 365) of the connection area between the third axial extension portion 361 and the fourth axial extension portion 362 of the base. Fig.19 As shown in FIG. 1 ), the base 36 can be biased toward the distal side along the axial direction X by the inner step surface. The storage container 4 includes a drug storage area 41 located at the distal side and an annular engagement area 42 extending toward the proximal side from the proximal end of the drug storage area (see FIG. 1 ). Fig.15A ), the engagement area 42 is held between the tab of the third axial extension 361 of the base and the fourth axial extension 362, and the proximal end of the engagement area 42 abuts against the outer step surface 363 of the connection area between the third axial extension and the fourth axial extension of the base. When the operator operates the operable component 51 to unlock the retaining device 5, the storage container 4 is no longer subject to the radial restriction of the above-mentioned blocking mechanism. At this time, under the biasing force of the third spring 37 toward the distal side, the base 36 together with the storage container 4 is pushed out of the syringe body 3 through the first internal push rod 33 and the distal opening of the outer shell 32. The arrangement of the base and the third spring enables the storage container to be directly pushed out (ejected) of the syringe body after unlocking the retaining device 5 when it is necessary to remove the storage container, without the operator having to manually pull out or pour out the storage container from the syringe body or use an auxiliary tool.

[0151] Further preferably, in order to avoid the storage container 4 from shaking in the first internal push rod 33 during operation (for example, displacement in the axial, radial or circumferential direction) and to prevent the storage container 4 made of, for example, glass from being knocked and broken by the side wall of the first internal push rod 33, a second annular groove 332 is provided on the inner wall surface of the proximal end of the first internal push rod 33, and the second annular groove accommodates a rubber ring 38 that contacts the outer peripheral side surface of the storage container, and the rubber ring is used to prevent the storage container from moving.

[0152] Next, turn to Figure 20 to Figure 22, which shows a retaining device according to another preferred embodiment of the present invention. In this embodiment, the overall structure and arrangement of the syringe may be the same or similar to those described in the previous embodiment, and will not be repeated here, and only the differences from the retaining device in the previous embodiment will be described.

[0153] In this embodiment, similar to the aforementioned embodiment, the operable component that can be operated by the operator to switch the retaining device between a locked state and an unlocked state is arranged on the external shell 32, the linkage mechanism is retained by a tubular first internal push rod 33 within the external shell of the syringe body, and the storage container 4 can be accommodated within the tubular cavity of the first internal push rod 33.

[0154] refer to Fig. 20 The linkage mechanism includes a swing rod 71 and an elastic element 72 which are accommodated in and retained by the first inner push rod 33. A through groove (in this embodiment, the through groove is the third through groove 334) for accommodating and retaining the swing rod and the elastic element is provided at a position near the distal end of the circumferential side wall of the first inner push rod 33. Fig.21 The swing rod 71 is pivotally mounted to the third through slot 334. Specifically, the swing rod 71 includes a pin 714 disposed at a substantially middle position of the swing rod, and the swing rod 71 is mounted to the third through slot 334 via the pin 714. The third through slot 334 includes two opposite side walls extending in the axial direction X, each of which is formed with a mounting hole 3341 (see FIG. 34 ) for accommodating and fixing the end of the pin. Fig. 22 ), the rocker arm 71 can pivot around the pin rod 714 in the third through slot 334.

[0155] Continue to refer Fig.21The rocker arm 71 includes a first leg 711 located proximal to the pin 714 and a second leg 712 located distal to the pin 714. The second leg 712 can be switched from a first state of radially interfering with the storage container 4 (for example, when the storage container is installed in the first inner push rod and the retaining device is in a locked state, the second leg 712 can interfere with and block the obliquely extending shoulder between the distal portion of the body of the storage container 4 and the head of the storage container 4, thereby preventing the storage container from being removed in the distal direction) to a second state of not interfering with the storage container 4 in response to the operable component (in this embodiment, the operable component is constructed to be press-type) being pressed by the operator to move from the locked position toward the unlocked position, thereby allowing the storage container 4 to be installed in the inner lumen of the first inner push rod or removed from the first inner push rod. Furthermore, the second leg 712 of the rocker arm 71 includes a protrusion 713 extending from the radial inner surface of the second leg toward the radial inner direction, and the protrusion is configured to radially interfere with the storage container 4 when the second leg 712 of the rocker arm 71 is in the above-mentioned first state, and to not interfere with the storage container 4 when the second leg 712 is in the second state.

[0156] Further, the elastic element 72 is configured to bias the second leg 712 of the rocker arm 71 toward a first state of radially interfering with the storage container 4. That is, the elastic element can bias the second leg 712 toward the radial inner direction so that the protrusion 713 can radially interfere with the storage container (for example, when the storage container is properly installed in the first inner push rod and the second leg 712 is in the first state, the protrusion 713 radially interferes with and blocks the distal portion of the storage container), so that the storage container cannot be installed or removed.

[0157] Further, refer to Fig. 22 The third through slot 334 of the first inner push rod 33 includes a first portion 3342 located at the proximal side and a second portion 3343 located at the distal side and having a width smaller than the first portion 3342. The width of the first portion 3342 is set to be smaller than the second portion 3343 in order to arrange the elastic element 72 at the radial inner side of the circumferential side wall of the first inner push rod 33 located at the second portion 3343. Specifically, the elastic element 72 is arranged between the radial outer side surface of the second leg portion 712 of the swing rod 71 and the radial inner side surface of the circumferential side wall of the first inner push rod 33 located at the second portion 3343 of the third through slot 334, and abuts against the two surfaces. The elastic element 72 is preferably a tension spring (those skilled in the art may also select other types of elastic elements 72 according to actual needs, such as a compressible elastic column, etc.), which can bias the second leg portion 712 toward the radial inner side direction via the radial outer side surface of the second leg portion 712 abutted thereon, so that the protrusion 713 of the second leg portion 712 radially interferes with the storage container 4.

[0158] Preferably, in this embodiment, the first leg portion 711 and the second leg portion 712 extend substantially parallel to each other.

[0159] Further, the operable component can engage the first leg 711 of the swing lever 71 to allow the first leg 711 of the swing lever 71 to move in a radially inward direction (along the direction of the first leg 711 of the swing lever 71) when the operator presses the operable component. Fig.21 The proximal arrow direction shown in the figure) causes the swing rod 71 to pivot around the pin rod (at this time, the second leg 712 overcomes the biasing force of the elastic element 72 and moves along the direction shown in the figure). Fig.21 The protrusion 713 of the second leg 712 moves in the distal direction of the arrow shown) to a position where the protrusion 713 of the second leg 712 does not interfere with the storage container 4.

[0160] Preferably, in order to limit the pivoting range of the swing lever 71 and prevent the elastic element 72 from biasing the second leg 712 excessively, a bottom wall 3344 is formed in the second portion 3343 of the third through slot 334 of the first inner push rod 33, and the bottom wall is configured so that when the second leg 712 of the swing lever 71 is in the first state (the retaining device is in the locked state), the distal end of the second leg 712 can overlap the bottom wall 3344, preventing the second leg 712 from further moving radially inward. At the same time, in order to prevent the bottom wall from obstructing the protrusion 713, the distance of the bottom wall 3344 extending toward the proximal side is set so that within the range of motion of the swing lever, the bottom wall 3344 never contacts the protrusion 713 of the swing lever 71.

[0161] The present invention is not intended to limit the number of the above-mentioned third through slots, rocker arms, and elastic elements. A person skilled in the art may set one third through slot, or may set a plurality of third through slots separately on the circumferential side wall of the first internal push rod as needed (for example, two third through slots are symmetrically arranged), and each through slot accommodates and retains a corresponding rocker arm and elastic element.

[0162] Next, turn to Figure 23 to Figure 25 , which shows a retaining device according to another preferred embodiment of the present invention. This embodiment is a reference Figure 20 to Figure 22 Variations of the described embodiments. The overall structure and arrangement of the syringe may be the same or similar to those described in the aforementioned embodiments, and will not be described in detail herein, and only the differences from the retaining device of the aforementioned embodiments will be described.

[0163] In this embodiment, similar to reference Figure 20 to Figure 22 In the described embodiment, the operable component that can be operated by an operator to switch the retaining device between a locked state and an unlocked state is arranged on the external shell 32, the linkage mechanism is retained by a tubular first internal push rod 33 within the external shell of the syringe body, and the storage container 4 can be accommodated in the tubular cavity of the first internal push rod 33.

[0164] refer to Fig.23 and Fig.24 The linkage mechanism includes a swing rod 71' and an elastic element 72' which are accommodated in the first inner push rod 33 and retained by the first inner push rod. A through groove (in this embodiment, the through groove is a fourth through groove 335) for accommodating and retaining the swing rod 71' and the elastic element 72' is provided at a position near the distal end of the circumferential side wall of the first inner push rod 33. Fig.24 The swing rod 71' is pivotally mounted to the fourth through slot 335. Specifically, the swing rod 71' includes a pin 714' disposed at a substantially middle position of the swing rod, and the swing rod 71' is mounted to the fourth through slot 335 via the pin 714'. The fourth through slot 335 includes two opposite side walls extending along the axial direction X, each of which is formed with a mounting hole 3351 (see FIG. 335 ) for accommodating and fixing the end of the pin 714'. Fig.25 ), the rocker arm 71' can pivot around the pin rod 714' in the fourth through slot 335.

[0165] In the present embodiment, unlike the previous embodiment, the first leg 711' of the swing lever 71' (rather than the distal second leg) can switch from a first state of radially interfering with the storage container 4 (for example, when the storage container is installed in the first inner push rod and the retaining device is in the locked state, the first leg 711' can interfere with and block the obliquely extending shoulder between the distal portion of the body of the storage container 4 and the head of the storage container 4, thereby preventing the storage container from being removed in the distal direction) to a second state of not interfering with the storage container 4, thereby allowing the storage container 4 to be installed in the internal tubular cavity of the first inner push rod or removed from the first inner push rod. Specifically, the proximal end of the first leg 711' of the swing lever 71' is configured to be able to radially interfere with the storage container 4 when the first leg 711' of the swing lever 71' is in the first state, and to be able to not interfere with the distal portion of the storage container 4 when the first leg 711' is in the second state.

[0166] Further, the elastic element 72' is configured to bias the second leg 712' of the swing lever 71' toward the radially outer side, so that the swing lever 71' pivots around the pin to a position where the proximal end of the first leg 711' can radially interfere with the storage container 4. In other words, the elastic element can bias the second leg 712' toward the radially outer side, so that the first leg 711' located on the other side of the pin extends further radially inward relative to the unlocked state, so that the proximal end can contact and interfere with the storage container 4 on the radial inner side.

[0167] Preferably, in this embodiment, in order to facilitate the proximal end of the first leg 711 ' to contact and interfere with the storage container in the locked state of the retaining device, an obtuse angle is formed between the first leg 711 ' and the second leg 712 ' toward the radial inner side.

[0168] Further, refer to Fig.25 , the fourth through slot 335 of the first inner push rod includes a first portion 3352 on the proximal side and a second portion 3353 on the distal side. The first portion 3352 allows the first leg 711' of the swing rod 71' to pass therethrough and radially interfere with the storage container 4. The second portion 3353 is provided with a bottom wall 3354, and the elastic element 72' is retained between the radial outer surface of the bottom wall and the radial inner surface of the second leg 712' of the swing rod 71', and abuts against the two surfaces. The elastic element is preferably a tension spring (those skilled in the art can also select other types of elastic elements 72' according to actual needs, such as compressible elastic columns, etc.), which can bias the second leg 712' toward the radial outer direction via the radial inner surface of the second leg 712' abutted by it, so as to keep the first leg 711' at a position where its proximal end radially interferes with the storage container 4.

[0169] Further, the operable component can engage the second leg 712' of the swing rod 71' to allow the second leg 712' of the swing rod 71' to overcome the biasing force of the elastic element 72' and move in the radially inner direction (along the direction of the swing rod 71') when the operator presses the operable component. Fig.24 The distal arrow direction shown in FIG. 1 ) causes the swing rod 71' to pivot around the pin (at this time, the first leg 711' moves in the direction shown in FIG. 1 ). Fig.24 The proximal end of the first leg 711 ′ moves in the direction of the proximal arrow shown in the figure) to a position where the proximal end of the first leg 711 ′ does not interfere with the storage container 4.

[0170] In addition, the present invention is not intended to limit the number of the third through slots, fourth through slots, swing rods, and elastic elements in the above-mentioned embodiments. A person skilled in the art may set one third through slot, or may set a plurality of third through slots separately on the circumferential side wall of the first inner push rod as required (for example, two third through slots are symmetrically arranged), each through slot accommodating and retaining a corresponding swing rod and elastic element. Similarly, a person skilled in the art may set one fourth through slot, or may set a plurality of fourth through slots separately on the circumferential side wall of the first inner push rod as required (for example, two fourth through slots are symmetrically arranged), each through slot accommodating and retaining a corresponding swing rod and elastic element.

[0171] Understandably, about Figure 23 to Figure 25 as well as Figure 20 to Figure 22 The features of the two embodiments described can be used interchangeably or in combination, and the present invention is not intended to limit them. Fig.24 The first leg 711' of the swing rod is arranged similarly to Fig.21 The protrusion 713 of the swing lever shown in the figure is provided so that the storage container is interfered with by the protrusion rather than the proximal end of the first leg 711'. Fig.21 The protrusion 713 is eliminated from the swing lever 71 shown, and the storage container is interfered with by the distal end of the second leg 712. In addition, in both embodiments, the first leg and the second leg can be arranged to extend parallel to each other, or to form an obtuse angle between the two toward the radial inner direction, and those skilled in the art can select according to needs.

[0172] Next, turn to Figure 26 to Figure 29 , which shows a retaining device according to another preferred embodiment of the present invention. In this embodiment, the overall structure and arrangement of the syringe may be the same or similar to those described in the previous embodiment, and will not be repeated here, and only the differences from the retaining device in the previous embodiment will be described.

[0173] The holding device according to the present embodiment also includes an operable component and a linkage mechanism 82. The linkage mechanism includes: a limiting mechanism, the limiting mechanism is configured to be able to move along the axial direction (X) between the first position and the second position in response to the movement of the operable component between the locked position and the unlocked position; and a blocking mechanism, the blocking mechanism is configured to be able to switch between a blocking state and a non-blocking state in response to the movement of the limiting mechanism between the first position and the second position. When the limiting mechanism is in the first position, the blocking mechanism is in a blocking state, and the blocking mechanism in the blocking state can interfere with the storage container in the radial direction to prevent the storage container from being installed to the syringe body or being removed from the syringe body. When the limiting mechanism is in the second position, the blocking mechanism is in a non-blocking state, and the blocking mechanism in the non-blocking state does not interfere with the storage container to allow the storage container to be installed to the syringe body or be removed from the syringe body.

[0174] The operable mechanism and linkage mechanism of the present embodiment can be arranged at the position close to the proximal part of the storage container. Of course, those skilled in the art can also adjust the arrangement position of the operable mechanism and linkage mechanism according to actual needs.

[0175] refer to Fig.28According to the present embodiment, the limiting mechanism includes a slip ring component 821. The slip ring component 821 is arranged in the first inner push rod 33, and is sleeved on the storage container and can move relative to the storage container in the axial direction X between the first position and the second position in response to the movement of the operable component between the locked position and the unlocked position in the axial direction X. The slip ring component 821 includes a distal cylindrical portion 8212, and a convex block 8213 is arranged on the outer peripheral side wall of the cylindrical portion, which can engage the operable component to move in the axial direction in the groove correspondingly arranged in the inner wall surface of the first inner push rod 33 under the drive of the operable component, so as to guide the slip ring component 821 to follow the movement of the operable component in the axial direction.

[0176] Preferably, in this embodiment, the operable component is arranged on the outer housing 32 and is configured as a push-type operable component. The operable component in this embodiment can be roughly similar to the one described above. Figures 7 to 16B The operable mechanism in the embodiment described above only needs some necessary adjustments. Figures 7 to 16B The protrusion 514 of the operable component 51 in the embodiment is replaced by an operating rod (not shown), which can extend from the operable component toward the radial inner side to the hole 82131 of the protrusion 8213 of the cylindrical part, and the hole can engage with the operating rod and be fixed to each other, so that when the operator operates the operable component, the sliding ring component 821 can be driven to move in the axial direction through the engagement between the operating rod and the hole 82131. Correspondingly, a second through groove 333 is provided at a position corresponding to the protrusion on the first inner push rod 33, and when the sliding ring component 821 moves between the first position and the second position, the second through groove 333 allows the hole 82131 of the protrusion 8213 to be exposed to the operating rod (that is, at all positions within the axial movement range of the protrusion, the hole 82131 will not be covered by the circumferential side wall of the first inner push rod).

[0177] Preferably, the cylindrical portion 8212 of the slip ring component includes two protrusions 8213 symmetrically arranged about the central axis, and each protrusion includes the above-mentioned hole 82131. Correspondingly, two operable components are symmetrically arranged about the central axis at the peripheral side wall of the outer shell, and each operable component is engaged with the hole 82131 of each protrusion through an operating rod. Correspondingly, the first inner push rod 33 also includes two second through grooves 333 symmetrically arranged.

[0178] The slip ring component 821 further includes a proximal frustoconical portion 8211 extending proximally from the cylindrical portion 8212 , and the frustoconical portion 8211 is used to engage with the blocking mechanism 822 to switch the blocking mechanism between a blocking state and a non-blocking state.

[0179] The blocking mechanism 822 is positioned on the proximal side of the limiting mechanism and includes: an elastic ring piece component 8221, which is arranged in the first internal push rod 33 and is sleeved on the storage container 4, and can be engaged with the truncated cone portion 8211 of the distal sliding ring component 821 to be switched between a blocking state and a non-blocking state by the truncated cone portion 8211; and

[0180] The mounting component 8222 is used to fix the elastic ring piece component 8221 to the first inner push rod 33, and the mounting component includes a distal tubular element 82221 and a proximal annular limiting element 82821. The tubular element 82221 is clamped in a corresponding fixed groove in the first inner push rod 33, and can be fixedly connected with the elastic ring piece component 8221. The annular limiting element 82821 is adjacently arranged on the proximal side of the tubular element 82221, and is used to limit the axial movement of the tubular element (that is, to limit the tubular element on the proximal side to prevent the operator's unlocking force from causing the tubular element to disengage from the fixed groove of the first inner push rod and slide proximally).

[0181] The elastic annular component 8221 includes a plurality of elastic elements 82211 arranged continuously in the circumferential direction, each elastic element 82211 includes: a fixed portion 822111, the fixed portion is located radially outward and is used to fix the elastic element to the distal edge of the tubular element 82221; and a deformable portion 822112, the deformable portion can be elastically deformed so that the angle R (such as Fig.29 as shown) switches between a first angle and a second angle.

[0182] When the sliding ring component 821 of the limiting mechanism is located at the distal first position, the truncated cone portion 8211 does not engage the annular component 8221, and the deformable portion 822112 of each of the plurality of elastic elements 82211 is in a stress-free state. At this time, the angle between the deformable portion 822112 and the fixed portion 822111 is the first angle, and at this time, the radial inner end of the deformable portion 822112 can contact and interfere with the storage container 4. When the sliding ring component 821 of the limiting mechanism moves toward the proximal side to the second position, the truncated cone portion 8211 biases the deformable portion of each of the plurality of elastic elements 82211 toward the radial outer side, so that the angle between the deformable portion 822112 of each of the plurality of elastic elements 82211 and the fixed portion 822111 is converted from the first angle to the second angle due to the pressure, and at this time, the radial inner end of the deformable portion 822112 no longer contacts the storage container. Wherein, the first angle is greater than the second angle. That is, when the deformable portion 822112 is partially engaged with the truncated cone portion 8211 of the slip ring component 821 and a force is applied, it can deform in a direction closer to the fixed portion 822111 (such as Fig.29 shown).

[0183] like Fig.28 As shown, the radial inner ends of the deformable parts 822112 of the multiple elastic elements 82211 jointly form the opening part 82212 of the elastic annular part 8221. When the angle between the deformable part 822112 of each of the multiple elastic elements 82211 and the fixed part 822111 is the first angle (that is, the sliding ring part 821 of the limiting mechanism is located at the first position of the distal side, and the truncated cone part 8211 does not engage the annular part 8221), the opening part 82212 has a first diameter. When the angle between the deformable part 822112 of each of the multiple elastic elements 82211 and the fixed part 822111 is the second angle (when the sliding ring part 821 of the limiting mechanism moves toward the proximal side to the second position, the truncated cone part 8211 biases the deformable part of each of the multiple elastic elements 82211 toward the radial outer side), the opening part 82212 has a second diameter. Wherein, the second diameter is greater than the first diameter. That is to say, when the operator operates the operable component (from the locked position to the unlocked position) so that the above-mentioned operating rod drives the sliding ring component 821 of the limiting mechanism to move from the first position to the second position toward the proximal side through the hole 82131, the truncated cone portion 8211 of the sliding ring component 821 presses the deformable portion 822112 of each of the multiple elastic elements 82211 of the elastic ring component 8221 radially outward, so that the opening 82212 defined by the elastic ring component 8221 becomes larger, thereby no longer contacting or interfering with the storage container 4, so that the storage container 4 can be freely installed or removed.

[0184] Further, in this embodiment, the storage container 4 can also be installed in the first inner push rod. Fig. 27 The first internal push rod 33 includes a second through groove 333 arranged corresponding to the hole 82131 on the protrusion 8213 of the slip ring component 821, so that when the slip ring component 821 is in the first position and the second position, the hole 82131 can be exposed from the second through groove 333, so that during the entire process of the axial movement of the slip ring, the hole 82131 can engage with the operating rod of the operable component to be driven by the operable component to perform axial movement.

[0185] Next, turn to Figure 30 to Figure 36 , which shows a retaining device according to another preferred embodiment of the present invention. In this embodiment, the overall structure and arrangement of the syringe may be the same or similar to those described in the previous embodiment, and will not be repeated here, and only the differences from the retaining device in the previous embodiment will be described.

[0186] Next, turn to Figure 30 to Figure 36, which shows a retaining device according to another preferred embodiment of the present invention. In this embodiment, the overall structure and arrangement of the syringe may be the same or similar to those described in the previous embodiment, and will not be repeated here, and only the differences from the retaining device in the previous embodiment will be described.

[0187] In the present embodiment, the operable component is arranged on the outer housing 32 and is configured as a press-type operable component. Fig.30 The linkage mechanism is maintained by the first internal push rod 33 in the outer housing. The storage container can be accommodated inside the first internal push rod 33.

[0188] In this embodiment, the linkage mechanism includes: a limiting mechanism, which is configured to move in a vertical radial direction between a first upper position and a second lower position in response to the movement of the operable component between a locked position and an unlocked position along the vertical radial direction; and a blocking mechanism, which is configured to switch between a closed blocking state and an open non-blocking state in response to the movement of the limiting mechanism between a first upper position and a second lower position along the vertical radial direction.

[0189] It should be noted that the directional descriptions such as "vertical", "horizontal", "up", "down", "top", "bottom", "left", "right" etc. mentioned in this embodiment are all described relative to the axial direction X extending longitudinally of the syringe, rather than absolute descriptions. For example, the vertical direction in this embodiment refers to a specific radial direction extending perpendicular to the axial direction X (refer to Fig.31 The horizontal direction refers to another specific radial direction perpendicular to the axial direction X and extending perpendicular to the horizontal direction (refer to Fig.31 left and right directions in the image).

[0190] refer to Fig.31 and Fig.32 The limiting mechanism of this embodiment includes a snap ring 921, which can be engaged by the operable component, so that when the operator presses the operable component downward, the snap ring moves downward in the vertical radial direction. The snap ring 921 can be sleeved on the radial outer side of the storage container 4 above the storage container 4. The snap ring 921 includes a top 9211 that can be engaged by the operable component and two arms extending from the top toward both sides in an arc shape as a whole, and an end 9213 of each of the two arms away from the top includes a guide groove 9214 for engaging the blocking mechanism and guiding the movement of the blocking mechanism. The guide groove 9213 extends in the horizontal radial direction.

[0191] refer to Fig.35 and Fig.35In order to install the snap ring 921, the first inner push rod 33 is formed with a snap groove 339 for accommodating the snap ring 921. The snap groove matches the shape of the snap ring 921, so that the snap ring can move in the snap groove between a first position at the top (corresponding to the locked state of the retaining device and the locked position of the operable component) and a second position at the bottom (corresponding to the unlocked state of the retaining device and the unlocked position of the operable component) in the vertical radial direction. The snap groove 921 includes two guide portions 337 extending in the vertical radial direction, each of which accommodates one of the two ends 9213 of the two arm portions of the snap ring 921 away from the top, and allows the end to move up and down in the vertical radial direction.

[0192] Furthermore, the slot 339 of the first internal push rod 33 includes a first tongue portion 336 extending distally from a proximal surface of the slot extending perpendicular to the axial direction, and the first tongue portion is located directly below the top of the retaining ring 921 9211, and is used to jointly retain an elastic element with the top of the retaining ring 921 (described in detail below, not shown in the figures).

[0193] Specifically, the limiting mechanism further includes an elastic element, which abuts between the hole 9212 opened on the bottom surface of the top of the snap ring 921 and the top surface of the first tongue portion 336, and is configured to bias the snap ring 921 upward to a first position (corresponding to the locked state of the retaining device and the locked position of the operable component). The elastic element can be, for example, a tension spring, which can bias the snap ring upward when the operator does not press the operable component, or other elastic components that can achieve the same function.

[0194] Further, refer to Fig.31 and Fig.33 The blocking mechanism includes two swing arms 9221 (each swing arm is roughly crescent-shaped) that are in an arc shape as a whole, and each swing arm is pivotally connected to the first inner push rod 33 through the bottom end of the swing arm. For example, a hole 9222 that penetrates the swing arm in the axial direction X is provided at the bottom end of each swing arm, and a hole 338 is provided on the step surface of the first inner push rod that extends perpendicular to the axial direction X corresponding to the hole 9222 of each swing arm. The hole 338 and the hole 9222 can be connected by a component such as a pin, so that each swing arm can be pivotally connected to the first inner push rod.

[0195] Furthermore, a guide pin 9223 is provided at a substantially middle position of each swing arm, and the guide pin can move along the guide groove 9213 of the arm portion located on the same side of the retaining ring 921. When the retaining ring 921 is located at the upper first position (corresponding to the locking position of the retaining device), each guide pin 9223 is located at the radially inner end of the corresponding guide groove 9213, so that the two swing arms 9221 together form a closed blocking state. In this blocking state, the two swing arms radially interfere with the storage container, thereby not allowing the storage container to be installed into the first internal push rod or removed. When the operator presses the operable component to cause the retaining ring 921 to move downward (such as Fig.31 When the retaining ring 921 is moved downward (in the direction indicated by the arrow on the top of the retaining ring) to the second position (corresponding to the unlocking position of the retaining device), the retaining ring 921 drives the corresponding guide pin 9223 to move to the radially outer end of the guide groove 9213 through each guide groove 9213 (that is, when the retaining ring moves downward, the guide groove 9213 forces the guide pin 9223 therein to move to the radially outer end of the guide groove 9213, thereby converting the corresponding swing arm from closed to open), so that the two swing arms 9221 move radially outward (as shown in the direction indicated by the arrow on the top of the retaining ring). Fig.31 The two swing arms 9221 shown in the figure are in an open non-blocking state, wherein the guide pin is located at the outer end of the guide groove) to form an open non-blocking state together. In this non-blocking state, the two swing arms do not interfere with the storage container, thereby allowing the storage container to be installed in the first internal push rod or removed.

[0196] Preferably, the retaining device of the present embodiment further comprises an annular limiting element 923 for limiting the axial position of the blocking mechanism and the limiting mechanism. The limiting element 923 is located at the distal side of the blocking mechanism and the limiting mechanism to prevent the blocking mechanism and the limiting mechanism from moving distally away from the first internal push rod 33. Preferably, in the present embodiment, the blocking mechanism is located at the distal side of the limiting mechanism, and the limiting element 923 comprises: an annular flange 9231 extending proximally, the annular flange being able to resist the two swing arms 9221 at the distal side; and a second tongue 9232 extending proximally beyond the annular flange 9231, the second tongue 9232 being able to resist the top 9211 of the snap ring 921 at the distal side when the snap ring 921 is at the first upper position. Preferably, the second tongue portion 9232 can cooperate with the fifth through slot 3310 correspondingly arranged on the first inner push rod 33, so that the second tongue portion 9232 is accommodated and retained in the fifth through slot 3310 when the limiting element 923 is installed on the first inner push rod 33. Fig.30 The diagram schematically shows a state in which the limiting element 923 is installed at the distal end of the first inner push rod 33 .

[0197] In addition, it should be understood that Figures 1 to 19The overall structure of the described syringe and other appropriate features can be applied individually or in combination to the embodiments described in other figures. For example, the principle, basic structure, drug suction and injection process of the needle-free syringe. Figures 15A to 15B as well as Figures 17 to 19 The described features, such as the structure for pushing out the storage container (for example, a base 36 disposed between the second internal push rod 34 and the proximal portion of the storage container, and a third spring 37 between the base and the second internal push rod) provided in order to make it more convenient for the operator to remove the storage container from the syringe body 3; and the second annular groove 332 of the first internal push rod 33 and the matching rubber ring 38 (to avoid shaking of the storage container 4 in the first internal push rod 33 during operation), combinations of features, modes of action of features, etc., are also applicable to other embodiments.

[0198] The present invention also provides a needle-free syringe, which includes the above-mentioned syringe body and a storage container located in the outer shell of the syringe body, the storage container can be removably installed in the syringe and used in conjunction with the syringe. The syringe also includes a retaining device described in the above-mentioned various embodiments, the retaining device is configured to prevent the storage container from being installed in the syringe or removed from the syringe in a locked state, or to allow the storage container to be installed in the syringe or removed from the syringe.

[0199] It should be noted that the above-mentioned embodiments of the present invention can be combined and / or deformed in various ways, and the results of the combination and / or deformation should also be considered as embodiments of the present invention. The above description of various embodiments of the present invention is provided to a person of ordinary skill in the relevant field for the purpose of description. It is not intended to exclude or limit the present invention to a single disclosed embodiment. As above, a person of ordinary skill in the field of the above teachings will understand the various substitutions and variations of the present invention. Therefore, although some alternative embodiments are specifically described, a person of ordinary skill in the art will understand or relatively easily develop other embodiments. The present invention is intended to include all substitutions, modifications and variations of the present invention described herein, as well as other embodiments that fall within the spirit and scope of the present invention described above.

Claims

1. A holding device for a storage container (4) for a needle-free syringe, wherein the storage container can be removably mounted in the needle-free syringe (1), characterized in that: The retaining device is configured to be switchable between a locked state and an unlocked state, wherein in the locked state, the retaining device is capable of preventing the storage container from being mounted on the syringe body (3) of the needle-free syringe or being removed from the syringe body, and in the unlocked state, the retaining device is capable of allowing the storage container to be mounted on the syringe body (3) or being removed from the syringe body, wherein the retaining device comprises: an operable component, the operable component being operable by an operator to move between a locked position and an unlocked position of the operable component to switch the holding device between the locked state and the unlocked state; a linkage mechanism configured to switch between a first state and a second state in response to movement of the operable component between the locked position and the unlocked position, wherein, when the operable component is in the locked position, the linkage mechanism is in the first state to prevent the storage container (4) from being installed on the syringe body (3) or removed from the syringe body, and When the operable component is located at the unlocked position, the linkage mechanism is in the second state to allow the storage container (4) to be installed to the syringe body (3) or removed from the syringe body.

2. The holding device according to claim 1, characterized in that The linkage mechanism is held by a tubular first internal push rod (33) within the outer housing of the syringe body, and wherein the storage container can be accommodated inside the first internal push rod (33).

3. The holding device according to claim 2, characterized in that: The linkage mechanism comprises: a limiting mechanism configured to be movable between a first position and a second position in response to movement of the operable component between the locked position and the unlocked position; and a blocking mechanism, wherein the blocking mechanism is configured to switch between a blocking state and a non-blocking state in response to the limiting mechanism moving between the first position and the second position, Wherein, when the limiting mechanism is located at the first position, the blocking mechanism is in a blocking state, and the blocking mechanism in the blocking state can interfere with the storage container in the radial direction to prevent the storage container from being installed on the syringe body or removed from the syringe body, and Wherein, when the limiting mechanism is located at the second position, the blocking mechanism is in a non-blocking state, and the blocking mechanism in the non-blocking state does not interfere with the storage container to allow the storage container to be installed to the syringe body or removed from the syringe body.

4. The holding device according to claim 3, characterized in that: The operable component is arranged on the outer housing (32) and is configured as a press-type operable component.

5. The holding device according to claim 3, characterized in that: The operable component is arranged on the outer housing (32) and is configured as a push-type operable component.

6. The holding device according to claim 5, characterized in that The stop mechanism is configured to be movable in the axial direction (X) between a first position and a second position in response to movement of the operable component in the axial direction (X) between the locked position and the unlocked position.

7. The holding device (5) according to claim 6, characterized in that The operable component (51) can be mounted in a recessed portion (321) of a circumferential side wall of an outer shell (32) of the syringe body (3), and The operable component (51) is movable in the recess (321) relative to the outer housing along the axial direction (X) between the locking position and the unlocking position.

8. The holding device (5) according to claim 7, characterized in that The operable component (51) comprises: a base (511) extending in an axial direction (X); an operator engaging portion (512) configured to extend radially outward from a radially outer surface of the base portion (511) and capable of being engaged by an operator to operate the operable component to move between the locked position and the unlocked position; a sliding portion (513) configured to extend inwardly from a radial inner surface of the base portion (511) along the radial direction, and wherein the radial inner surface of the sliding portion is capable of contacting a radial outer surface of a bottom wall (3211) of a recessed portion (321) of the outer housing (32) to move on the surface along the axial direction (X); and a protrusion (514), the protrusion being configured to extend inwardly along the radial direction from the radial inner surface of the sliding portion (513), and to protrude from an opening (32111) at a corresponding position of the bottom wall (3211) of the recessed portion (321) toward the radial inner side of the outer housing (32), the opening (32111) extending along the axial direction (X) and allowing the protrusion to move therein along the axial direction (X), and Wherein, the protrusion (514) is capable of engaging the linkage mechanism (52) so that the linkage mechanism switches between the first state and the second state in response to the movement of the protrusion (514) along the axial direction (X) in the opening (32111) of the recess (321).

9. The holding device (5) according to claim 8, characterized in that The sliding portion (513) of the operable component includes a columnar component (5131) extending along the axial direction (X), and an end wall of the recessed portion perpendicular to the axial direction (X) is provided with a hole (32121) aligned with the columnar component (5131), and Wherein, the retaining device (5) further comprises a first spring (53) extending along the axial direction (X), the first spring comprising: a first end portion (531) received and confined within a hole (32121) of an end wall (3212) of the recess; and The second end portion (532) is sleeved on the outer peripheral side of the columnar member (5131), Wherein, the first spring (53) is configured to bias the operable part (51) toward the locking position via the columnar part (5131).

10. The holding device (5) according to claim 9, characterized in that The locked position of the operable member (51) is located distally relative to the unlocked position, The columnar component (5131) extends from the proximal end surface of the sliding portion (513) toward the proximal side, the hole (32131) is opened in the proximal end wall (3212) of the recessed portion (321), and Wherein, the first spring (53) is configured to bias the operable part (51) toward the distal locking position through the columnar part (5131).

11. The holding device (5) according to claim 10, characterized in that The retaining device further comprises a first guide engaging portion extending in the axial direction (X) and arranged in a recess (321) of the outer housing (32), wherein the sliding portion of the operable component comprises a second guide engagement portion extending along the axial direction (X), and The first guide engaging portion and the second guide engaging portion are configured to cooperate with each other to guide the movement of the sliding portion (513) of the operable component in the recessed portion (321) of the external housing.

12. The holding device (5) according to claim 11, characterized in that The first guide joint portion is constructed to include at least one guide column (322) fixedly arranged in a recessed portion of the external shell, and the second guide joint portion is constructed to include at least one through hole (5132) opened in the sliding portion and extending through the sliding portion along the axial direction (X), each through hole being matched with the shape of the corresponding guide column (322), thereby allowing the sliding portion (513) to move along the axial direction (X) through the axial movement of each through hole on the corresponding guide column.

13. The holding device (5) according to claim 12, characterized in that The two ends of each guide column in the axial direction (X) are respectively accommodated and fixed in two U-shaped fixing members (323) extending outward along the radial direction from the radial outer surface of the bottom wall (3211) of the recessed portion (321), and the two U-shaped fixing members are configured to jointly limit the movement of the guide column.

14. The holding device (5) according to claim 13, characterized in that The number of the through holes (5132) of the sliding part is two, and the two through holes are respectively opened at positions close to the two ends of the sliding part parallel to the axial direction (X), and accordingly, The number of the guide posts (522) is two, and the two guide posts are respectively located at positions on the recessed portion corresponding to the circumferential positions of the two through holes of the sliding portion.

15. The holding device (5) according to any one of claims 5 to 14, characterized in that The blocking mechanism (522) comprises a first annular component (5221), the first annular component comprises a blocking portion (52211), the blocking portion is provided with a through hole (52212) extending in the radial direction, and a ball (5222) is accommodated in the through hole. wherein the diameter of the through hole (52212) is not smaller than that of the ball, so as to allow the ball (5222) to move back and forth in the radial direction along the inner wall surface of the through hole, and Wherein, the through hole (52212) includes: a first opening end (522121) located radially inner, a second opening end (522122) located radially outer, and an annular first flange (522123) extending from the inner wall surface of the through hole to the inside of the through hole at the first opening end, and the size of the first flange is constructed to allow at least a part of the ball (5222) to protrude radially inward from the first opening end (522121) of the through hole (52212), while preventing the ball from continuing to move radially inward and detaching from the through hole.

16. The holding device (5) according to claim 15, characterized in that The limiting mechanism (521) comprises a second annular component (5211) sleeved on the outer peripheral side of the first annular component (5221), and the second annular component is configured to be able to move along the axial direction (X) between the first position and the second position in response to the movement of the protrusion (514) along the axial direction (X) in the opening (32111) of the recessed portion (321) of the external shell. The second annular component (5211) includes an annular second flange (52111) extending radially inward from the inner wall surface of the second annular component. wherein, when the second annular component (5211) is located at the first position, the second flange (52111) is aligned with the through hole (52212) of the blocking mechanism (522) in the axial direction (X), and the radial inner surface of the second flange (52111) resists the ball (5222) in the through hole (52212) of the blocking mechanism to force at least a portion of the ball to protrude radially inward from the first opening end (522121) of the through hole, thereby interfering with the storage container (4) in the radial direction, and When the second annular component (5211) is located at the second position, the second flange (52111) is offset from the through hole (52212) of the blocking mechanism in the axial direction (X) to allow the ball (5222) to move freely radially outward to a position where it no longer protrudes radially inward from the first opening end (522121) of the through hole, thereby no longer interfering with the storage container (4).

17. The holding device (5) according to claim 15, characterized in that The proximal end of the first annular member (5221) is configured to be fixed to the distal end of the first internal push rod (33).

18. The holding device (5) according to claim 17, characterized in that The first position is located at the far side relative to the second position, wherein the limiting mechanism (521) further comprises a second spring (5212), the second spring is positioned between the first annular component and the second annular component, and is sleeved on the outer peripheral side of the first annular component, wherein the proximal end of the second spring (5212) abuts against the distal end surface of the first internal push rod (33), and the distal end of the second spring abuts against the proximal surface of the second flange (52111) of the second annular component (5211), and Wherein, the second spring (5212) is configured to bias the second annular component toward the first distal position through the proximal end surface of the second flange (52111).

19. The holding device (5) according to claim 18, characterized in that The proximal end of the first annular component (5221) is formed with an external thread, and the distal end of the first internal push rod (33) is formed with an internal thread that cooperates with the external thread of the first annular component (5221).

20. The holding device (5) according to claim 19, characterized in that A slope (521111) is formed on the distal side of the second flange (52111) of the second annular component (5211), wherein when the second annular component (5211) moves proximally from a first position to a second position along the axial direction (X), the ball can move along the slope (521111) of the second flange to a position where it no longer protrudes radially inward from the first opening end of the through hole.

21. The holding device (5) according to claim 20, characterized in that The second annular component (5211) further includes a third flange (52112), which is located at the distal portion of the second annular component (5211) and extends radially inward from the inner wall of the second annular component. Wherein, the second flange (52111) is located on the proximal side of the third flange (52112), and the second flange is located between the third flanges to form a first annular groove (52113), and the first annular groove is configured to at least partially accommodate the ball (5222) when the second annular part is located in the second position.

22. The holding device (5) according to claim 21, characterized in that The first annular component (5221) includes a plurality of circumferentially distributed through holes (52212), each of which accommodates the ball (5222).

23. The holding device (5) according to claim 22, characterized in that The plurality of through holes (52212) are arranged at equal intervals.

24. The holding device (5) according to claim 2, characterized in that The holding device also includes a base (36) for holding the storage container (4), the base is located on the proximal side of the storage container and is configured to be shaped to fit with the proximal end of the storage container for accommodating and holding the proximal end of the storage container.

25. The holding device (5) according to claim 24, characterized in that The retaining device further comprises a third spring (37) configured to be positioned between the base (36) and a tubular second inner push rod (34) within the outer housing (32) of the syringe body, the second inner push rod (34) being configured to be located proximal to the first inner push rod (33) and fixed to the first inner push rod (33). The third spring (37) is configured to bias the base (36) toward the distal side along the axial direction (X).

26. The holding device (5) according to claim 25, characterized in that The second inner push rod (34) comprises: a first axial extension portion (341), the first axial extension portion comprising an elongated first through slot (3411) formed on a side wall and extending along the axial direction (X), the first through slot extending to a distal end of the first axial extension portion; and a second axial extension (342) extending distally from a distal end of the first axial extension, Wherein, an annular fourth flange (3412) extending radially inward from the inner wall surface of the first axially extending portion (341) is provided at a substantially middle position of the first axially extending portion (341) in the axial direction (X), and, The second axial extension portion (342) is used to engage the proximal end of the first internal push rod (33) so as to be fixed to the first internal push rod (33).

27. The holding device (5) according to claim 26, characterized in that The base (36) comprises: a third axial extension portion (361), wherein a distal portion of the third axial extension portion is provided with a protrusion (3611) extending distally, wherein the protrusion corresponds to the position of the first through slot (3411) of the second internal push rod (34), thereby being able to move in the first through slot along the axial direction (X); and A fourth axial extension portion (362) extends distally from a distal end of the third axial extension portion (361).

28. The holding device (5) according to claim 27, characterized in that The proximal end of the third spring (37) abuts against the distal surface of the fourth flange (3412) of the second internal push rod (34), and the distal end of the third spring abuts against the internal step surface (364) extending perpendicular to the axial direction in the connecting area between the third axial extension portion (361) and the fourth axial extension portion (362) of the base, so that the base (36) can be biased distally along the axial direction (X) through the internal step surface.

29. The holding device (5) according to claim 28, characterized in that The storage container (4) comprises a medicine storage area (41) located at the distal side and an annular engagement area (42) extending proximally from the proximal end of the medicine storage area, wherein the engagement area is held between the tab of the third axial extension portion (361) and the fourth axial extension portion (362) of the base, and In which, the proximal end of the coupling area (42) abuts against an external step surface (363) extending perpendicular to the axial direction of the connection area between the third axial extension portion and the fourth axial extension portion of the base, so that when the operator operates to unlock the retaining device (5), the storage container can follow the base and be pushed out of the syringe body by the third spring (37).

30. The holding device (5) according to claim 26, characterized in that The second axial extension portion (342) of the second internal push rod (34) is provided with an internal thread, and the proximal end portion of the first internal push rod (33) is provided with an external thread that cooperates with the internal thread of the second axial extension portion.

31. The holding device (5) according to claim 26, characterized in that The first axial extension portion of the second internal push rod (34) includes a plurality of the first through slots (3411), and the third axial extension portion of the base includes a plurality of protrusions (3611) corresponding in position to the first through slots and having the same number as the first through slots.

32. The holding device (5) according to claim 2, characterized in that The inner wall surface of the proximal end of the first internal push rod (33) is provided with a second annular groove (332), and the second annular groove accommodates a rubber ring (38) that contacts the outer peripheral side surface of the storage container, and the rubber ring is used to prevent the storage container from moving.

33. The holding device (5) according to claim 15, characterized in that The first annular component (5221) further includes a coupling portion (52214) located at the distal side of the blocking portion (52211), and the coupling portion is used to couple with the piston rod (22) of the injection head (2) to be fixed to the piston rod.

34. The holding device (5) according to claim 33, characterized in that The engaging portion (52214) of the first annular member is formed with a third annular groove (52213) near the distal end of the first annular member, and The proximal end of the piston rod is provided with an elastic snap-on portion (221) extending proximally along the axial direction (X), and the snap-on portion can be snapped onto the distal end surface (522131) of the third annular groove, so that the piston rod (22) and the first annular component (5221) are fixed to each other.

35. The holding device according to claim 6, characterized in that The limiting mechanism comprises a sliding ring component (821), which is arranged in the first internal push rod (33) and is sleeved on the storage container (4). The slip ring component is capable of moving relative to the storage container along the axial direction (X) between a first position and a second position in response to movement of the operable component between the locked position and the unlocked position along the axial direction (X), wherein the slip ring component comprises: a distal cylindrical portion (8212), wherein the outer peripheral side wall of the cylindrical portion is provided with a protrusion (8213), which is capable of engaging the operable component so as to move in an axial direction in a corresponding groove arranged in the inner wall surface of the first inner push rod (33) under the drive of the operable component, so as to guide the movement of the slip ring component (821) in the axial direction; and A proximal frustoconical portion (8211) is provided for engaging the blocking mechanism (822) to switch the blocking mechanism between the blocking state and the non-blocking state.

36. The holding device according to claim 35, characterized in that The blocking mechanism is positioned at the proximal side of the limiting mechanism and comprises: an elastic ring piece component (8221), which is arranged in the first internal push rod (33) and is sleeved on the storage container (4), and the elastic ring piece component is capable of engaging with the truncated cone portion (8211) of the distal sliding ring component (821); and a mounting component (8222) for fixing the elastic ring piece component (8221) to the first internal push rod (33), the mounting component comprising a distal tubular element (82221) and a proximal annular limiting element (82821), The tubular element (82221) is clamped in a corresponding fixing groove in the first internal push rod (33), and can be fixedly connected to the elastic ring piece component (8221), and, Wherein, the annular limiting element (82821) is adjacently arranged on the proximal side of the tubular element to limit the axial movement of the tubular element.

37. The holding device according to claim 36, characterized in that The elastic annular component (8221) includes a plurality of elastic elements (82211) arranged continuously in the circumferential direction, and each elastic element (82211) includes: a fixing portion (822111) located radially outward and used for fixing the elastic element to the distal edge of the tubular element (82221); and A deformable portion (822112), wherein the deformable portion can be elastically deformed so that the angle (R) between the deformable portion and the fixed portion is switched between a first angle and a second angle.

38. The holding device according to claim 37, characterized in that When the sliding ring component (821) of the limiting mechanism is located at the distal first position, the truncated cone portion (8211) does not engage the annular component (8221), and the angle between the deformable portion (822112) and the fixed portion (822111) of each of the plurality of elastic elements (82211) is a first angle, and at this time, the radial inner end of the deformable portion (822112) contacts and interferes with the storage container; When the sliding ring component (821) of the limiting mechanism moves proximally to the second position, the truncated cone portion (8211) biases the deformable portion of each of the plurality of elastic elements (82211) radially outward, so that the angle between the deformable portion (822112) and the fixed portion (822111) of each of the plurality of elastic elements (82211) is converted from the first angle to the second angle, and at this time, the radial inner end of the deformable portion (822112) does not contact the storage container, and Wherein, the first angle is greater than the second angle.

39. The holding device according to claim 38, characterized in that The radially inner ends of the deformable portions (822112) of the plurality of elastic elements (82211) jointly form an opening portion (82212) of the elastic annular component (8221). Wherein, when the angle between the deformable portion (822112) and the fixed portion (822111) of each of the plurality of elastic elements (82211) is a first angle, the opening portion (82212) has a first diameter; Wherein, when the angle between the deformable portion (822112) and the fixed portion (822111) of each of the plurality of elastic elements (82211) is a second angle, the opening portion (82212) has a second diameter, and Wherein, the second diameter is greater than the first diameter.

40. The holding device according to claim 35, characterized in that The projection (8213) includes a hole (82131) configured to be engageable by an operating rod of the operable component.

41. The holding device according to claim 40, characterized in that A second through groove (333) is provided at a position on the first internal push rod (33) corresponding to the protrusion, and when the slip ring component (821) moves between the first position and the second position, the second through groove (333) allows the hole (82131) of the protrusion to be exposed to the operating rod.

42. The holding device according to claim 1, characterized in that The cylindrical portion (8212) of the slip ring component includes two symmetrically arranged protrusions (8213), and Correspondingly, the first internal push rod (33) comprises two second through grooves (333) that are symmetrically arranged.

43. The holding device according to claim 2, characterized in that The operable component is arranged on the outer housing (32) and is configured as a push-type operable component, and The linkage mechanism includes a rocker rod and an elastic element which are accommodated inside and retained by the first inner push rod (33).

44. The holding device according to claim 43, characterized in that A through slot for accommodating and retaining the rocker arm and the elastic element is provided at a position near the distal end of the circumferential side wall of the first internal push rod (33), wherein the rocker arm is pivotally mounted to the through slot.

45. The holding device according to claim 44, characterized in that The swing rod comprises a pin rod arranged at a substantially middle position of the swing rod, and the swing rod is mounted to the through slot via the pin rod. The through slot comprises two opposite side walls extending in the axial direction (X), each side wall being formed with a mounting hole for accommodating and fixing the end of the pin rod, and The rocker arm can pivot around the pin in the through slot.

46. ​​The holding device according to claim 45, characterized in that The swing rod includes a first leg portion located proximal to the pin and a second leg portion located distal to the pin, One of the first leg and the second leg can switch from a first state of radially interfering with the storage container (4) to a second state of not interfering with the storage container (4) in response to the operable component being pressed by an operator to move from the locked position toward the unlocked position.

47. The holding device according to claim 46, characterized in that The second leg (712) of the swing lever (71) is capable of switching from a first state of radially interfering with the storage container (4) to a second state of not interfering with the storage container (4) in response to the operable component being pressed by an operator to move from the locked position toward the unlocked position, and Wherein, the second leg (712) of the rocker arm (71) includes a protrusion (713) extending from the radial inner surface of the second leg toward the radial inner direction, and the protrusion is configured to radially interfere with the storage container (4) when the second leg (712) of the rocker arm (71) is in the first state, and to not interfere with the storage container (4) when the second leg is in the second state.

48. The holding device according to claim 47, characterized in that The elastic element (72) is configured to bias the second leg (712) of the rocker (71) toward a first state in which the second leg (712) radially interferes with the storage container (4).

49. The holding device according to claim 48, characterized in that The through slot of the first internal push rod for accommodating and holding the swing rod is a third through slot (334), and the third through slot (334) includes a first portion (3342) on the proximal side and a second portion (3343) on the distal side whose width is smaller than that of the first portion. Wherein, the elastic element (72) is arranged between the radial outer surface of the second leg (712) of the rocker arm (71) and the radial inner surface of the circumferential side wall of the first internal push rod (33) located at the second part (3343) of the third through groove (334), and is capable of biasing the second leg (712) of the rocker arm (71) along the radial inner direction toward a position that radially interferes with the storage container (4).

50. The holding device according to claim 49, characterized in that The operable component is capable of engaging the first leg (711) of the rocker arm (71) to allow the first leg (711) of the rocker arm (71) to move radially inward when the operator presses the operable component, so that the rocker arm (71) overcomes the biasing force of the elastic element (72) and pivots around the pin to a position where the protrusion (713) of the second leg (712) of the rocker arm (71) does not interfere with the storage container (4).

51. The holding device according to claim 50, characterized in that The second portion (3343) of the third through slot (334) includes a bottom wall (3344) configured so that when the second leg (712) of the swing rod (71) is in the first state, the distal end of the second leg (712) can overlap the bottom wall (3344), and Wherein, the bottom wall (3344) does not contact the protruding portion (713) of the rocker (71).

52. The holding device according to claim 47, characterized in that The first leg portion (711) and the second leg portion (712) of the swing rod (71) extend substantially parallel to each other.

53. The holding device according to claim 46, characterized in that The first leg (711') of the swing lever (71') is capable of switching from a first state of radially interfering with the storage container (4) to a second state of not interfering with the storage container (4) in response to the operable component being pressed by an operator to move from the locked position toward the unlocked position, and Wherein, the proximal end of the first leg (711') of the rocker arm (71') is configured to be able to radially interfere with the storage container (4) when the first leg (711') of the rocker arm (71') is in a first state, and to not interfere with the storage container (4) when the first leg is in a second state.

54. The holding device according to claim 53, characterized in that The elastic element (72') is constructed to bias the second leg (712') of the rocker (71') toward the radially outer side, so that the rocker (71') pivots around the pin to radially interfere with the position of the storage container (4) at the proximal end of the first leg (711') of the rocker.

55. The holding device according to claim 54, characterized in that The through slot of the first internal push rod for accommodating and holding the swing rod is a fourth through slot (335), and the fourth through slot (335) includes a first portion (3352) on the proximal side and a second portion (3353) on the distal side. wherein the first portion (3352) of the fourth through slot (335) allows the first leg portion (711') of the swing rod (71') to pass therethrough and radially interfere with the storage container (4), and The second portion (3353) of the fourth through groove (335) is provided with a bottom wall, and the elastic element (72') is held between the bottom wall and the radial inner surface of the second leg portion (712') of the rocker (71').

56. The holding device according to claim 55, characterized in that The operable component is capable of engaging the second leg (712') of the rocker arm (71'), so that when the operator presses the operable component, the second leg (712') of the rocker arm (71') is able to overcome the biasing force of the elastic element (72') and move radially inward, so that the rocker arm (71') pivots around the pin rod to the position where the proximal end of the first leg (711') of the rocker arm (71') does not interfere with the storage container (4).

57. The holding device according to claim 53, characterized in that An obtuse angle is formed between the first leg portion (711') and the second leg portion (712') of the swing rod (71') in the radially inner direction.

58. The holding device according to claim 44, characterized in that One or more through slots are provided in the circumferential side wall of the first internal push rod (33) along the circumferential direction, and each through slot accommodates and retains the rocker rod and the elastic element.

59. The holding device according to claim 43, characterized in that The elastic element is a tension spring.

60. The holding device according to claim 3, characterized in that The operable component is arranged on the outer housing (32) and is configured as a press-type operable component. The limiting mechanism is configured to move in a vertical radial direction between a first upper position and a second lower position in response to movement of the operable component in a vertical radial direction between a locked position and an unlocked position, and The blocking mechanism is configured to switch between a closed blocking state and an open non-blocking state in response to movement of the limiting mechanism between the first position and the second position.

61. The holding device according to claim 60, characterized in that The limiting mechanism includes a snap ring (921) which can be engaged by the operable component so that when the operator presses the operable component downward, the snap ring moves downward.

62. The holding device according to claim 61, characterized in that The clamping ring (921) can be sleeved on the radially outer side of the storage container above the storage container (4). The snap ring (921) includes a top portion (9211) that can be engaged by the operable component and two arms extending from the top portion toward both sides and having an overall arc shape, and an end portion (9213) of each of the two arms away from the top portion includes a guide groove (9214) for engaging the blocking mechanism and guiding the movement of the blocking mechanism, and Wherein, the guide groove (9213) extends along a horizontal radial direction.

63. The holding device according to claim 62, characterized in that The first internal push rod (33) is formed with a slot (339) for accommodating the snap ring (921), the slot matching the shape of the snap ring so that the snap ring can move in the slot between a first position and a second position in a vertical radial direction. Wherein, the retaining groove includes two guide portions (337) extending in a vertical radial direction, each of which accommodates one of the two ends of the two arms of the retaining ring (921) away from the top and allows the end to move up and down in the vertical radial direction.

64. The holding device according to claim 63, characterized in that The retaining groove (339) of the first internal push rod includes a first tongue (336) extending distally from a proximal surface of the retaining groove extending perpendicular to the axial direction, and the first tongue is located below (9211) the top of the retaining ring (921).

65. The holding device according to claim 64, characterized in that The limiting mechanism also includes an elastic element, which abuts between a hole (9212) opened on the bottom surface of the top of the snap ring (921) and the top surface of the first tongue portion (336), and is configured to bias the snap ring (921) upward.

66. The holding device according to claim 65, characterized in that The blocking mechanism comprises two swing arms (9221) which are in the shape of an arc as a whole, and each swing arm is pivotally connected to the first internal push rod (33) through the bottom end of the swing arm.

67. The holding device according to claim 66, characterized in that A guide pin (9223) is provided at a substantially middle position of each swing arm, and the guide pin can move along the guide groove (9213) of the arm portion located on the same side of the snap ring (921). Wherein, when the snap ring (921) is located at the upper first position, each guide pin (9223) is located at the radial inner end of the corresponding guide groove (9213), so that the two swing arms (9221) together form a closed blocking state, in which the two swing arms radially interfere with the storage container; and When the operator presses the operable component to make the snap ring (921) move downward to the second position, the snap ring (921) drives the corresponding guide pin (9223) to move to the radial outer end of the guide groove (9213) through each guide groove (9213), so that the two swing arms (9221) move radially outward to jointly form an open non-blocking state. In the non-blocking state, the two swing arms do not interfere with the storage container.

68. The holding device according to claim 67, characterized in that The retaining device further comprises an annular limiting element (923) for limiting the axial position of the blocking mechanism and the limiting mechanism.

69. The holding device according to claim 68, characterized in that The limiting element (923) is located at the distal side of the blocking mechanism and the limiting mechanism to prevent the blocking mechanism and the limiting mechanism from moving distally and disengaging from the first internal push rod (33).

70. The holding device according to claim 69, characterized in that The blocking mechanism is located at the far side of the limiting mechanism. The limiting element (923) comprises: an annular flange (9231) extending proximally, the annular flange being capable of resisting the two swing arms (9221) distally; and A second tongue (9232) extends proximally beyond the annular flange (9231), and the second tongue (9232) is capable of resisting the top (9211) of the retaining ring (921) distally when the retaining ring (921) is in the upper first position.

71. A needle-free syringe (1), comprising a syringe body (3) and a storage container (4) located within an outer housing (32) of the syringe body, the storage container being removably mountable in the needle-free syringe, in, The syringe body (3) comprises: the outer shell (32) and a tubular first internal push rod (33) in the outer shell, characterized in that the needle-free syringe further comprises: According to any one of claims 1-70, the retaining device for the storage container is configured to prevent the storage container from being installed into or removed from the needle-free syringe in a locked state, or to allow the storage container to be installed into or removed from the needle-free syringe.

72. The needle-free injector (1) according to claim 71, characterized in that The needle-free syringe further comprises an injection head (2) which can be removably mounted to the syringe body, the distal end of the injection head comprising an injection micro-hole.

73. The needle-free injector (1) according to claim 71, characterized in that The storage container (4) is a cartridge bottle.

74. The needle-free injector (1) according to claim 71, characterized in that The linkage mechanism is held by a tubular first internal push rod (33) within the outer housing (32) of the syringe body, and the storage container can be accommodated inside the first internal push rod (33), Wherein, the first internal push rod (33) includes a first hollow portion (331) formed on the circumferential side wall, and the external shell (32) includes a second hollow portion (322) aligned with the first hollow portion in the circumferential direction, and the first hollow portion (331) and the second hollow portion (322) together form a visual window for an operator to observe the storage container.

75. The needle-free injector (1) according to claim 74, characterized in that The operable component (51) can be mounted in a recessed portion (321) of a circumferential side wall of an outer shell (32) of the syringe body (3), and the first hollow portion (331) and the second hollow portion (322) have an elongated shape extending in the axial direction (X), and Wherein, the second hollow portion is located near the recessed portion (321).

76. The needle-free injector (1) according to claim 75, characterized in that The needle-free syringe (1) further comprises a cover (6) which is engageable with the outer shell (32) of the needle-free syringe to cover the recessed portion (321) and the second hollow portion (322), and The cover (6) comprises a window (61), and when the cover is covered on the external shell (32), the operator engagement portion of the operable component can be exposed to the operator through the window.

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