Trigger mechanism, safety shield and safety syringe

Abstract

The present disclosure provides a trigger mechanism, comprising an inner sheath and an outer sheath in a sleeve connection, corresponding ends of the inner sheath and the outer sheath are respectively provided with a first buckle group that is buckled, and further comprising a first trigger part that is insertable into the first buckle group and is arranged at the position of the first buckle group, the first trigger part is pushed by a pushing force to make the mutually buckled first buckle group separate from each other and be disengaged. The present disclosure also provides a safety protection device and a safety syringe, the safety protection device and the safety syringe of the present disclosure can realize stable and reliable triggering, needle withdrawal protection, synchronous locking of a piston push rod to prevent residual liquid leakage, and simple and convenient installation.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of medical devices, in particular to a trigger mechanism, a safety protection device and a safety syringe. BACKGROUND

[0002] The conventional syringes in China generally do not have a needle withdrawal protection device. After injection, the needle is exposed, which can cause pollution and injury to others. In order to prevent the needle of the used syringe from causing injury to the user or causing drug pollution or the syringe from being used again, a special needle withdrawal protection device is generally added to the syringe. After injection, the needle withdrawal protection is started by the corresponding mechanism to prevent injury.

[0003] The inventor knows that some safety syringes in the related technical solutions do not have a trigger mechanism but have a clamping device arranged at the corresponding position of the inner sleeve and the outer shell to trigger. However, such arrangement has the problem of poor triggering. Although some solutions have a trigger mechanism, the structure is complex. In order to complete the triggering action, the complexity of other structures is increased and the installation work is increased. In another solution, in order to hook or clamp firmly, the clamping position of the safety syringe is provided with a transition groove or a transition surface inclined or a too steep fitting slope. Although such arrangement strengthens the clamping, it causes difficulty in disengagement or disengagement. If the clamping position is easily disengaged, it can cause the device to fail when it does not start to protect when it is not needed to disengage. Alternatively, although the trigger device can trigger, in order to prevent the trigger device from sliding or disengaging from the inner sleeve or the outer shell, the end of the trigger device away from the needle is designed to be too complex, which causes difficulty in installation and assembly. Alternatively, the installation of the trigger mechanism needs to be assisted by a tool fixture to be successfully installed, or a large force is needed to trigger the trigger device of the safety syringe.

[0004] In order to solve the above problems, a trigger mechanism and a safety syringe device containing the same are developed, which are convenient to install and can stably trigger and disengage. SUMMARY

[0005] The technical problem to be solved by the present disclosure is to provide a trigger mechanism, a safety protection device and a safety syringe to solve one of the above-mentioned defects in the prior art. In the present disclosure, the cylindrical body refers to a tubular object, including a hollow object with a circular, elliptical or square cross section and other various shapes.

[0006] In this patent, the syringe head is defined as the part furthest from the needle, and the needle tip as the tail; that is, the part held and grasped by the hand is the head. In the inner and outer sheaths of the syringe body, the end with the flange is the head, and the part furthest from the flange is the tail. Similarly, in the inner sheath, the end with the flange is the head, and the end furthest from the flange is the tail. In the syringe piston rod, the part with the flange is the head, and the piston end is the tail. The portion of the cylindrical end or main body that protrudes from the cylindrical body is called a flange or ferrule.

[0007] This disclosure provides a triggering mechanism, including an inner sheath and an outer sheath that are connected internally and externally. Corresponding ends of the inner and outer sheaths are respectively provided with a first latching assembly that engages with each other. It also includes a first triggering part disposed at the position of the first latching assembly, which can be inserted into the first latching assembly. Specifically, the first triggering part can be disposed at or within the engagement position of the first latching assembly. When the first triggering part is subjected to a pushing force, it can cause the interlocking first latching assemblies to separate and disengage. This disclosure transmits the force to the first latching assembly by applying force to the first triggering part, causing the first latching assemblies to separate and the inner and outer sheaths to disengage. The engagement position of the first latching assembly mentioned in this disclosure refers to the engagement position range of the first latching assembly.

[0008] The corresponding end described in this disclosure does not necessarily represent the end of the inner sheath or the end of the outer sheath, but only represents a directional orientation rather than a limitation or fixation of the orientation.

[0009] The triggering mechanism disclosed herein is located on the inner or outer sheath, and can reliably actuate the first latch group to separate the interlocking parts without the need for external force.

[0010] In some or one embodiment of the triggering mechanism disclosed herein, a first flange is provided at one end of the inner sheath, and a first buckle protruding in the radial direction is provided on the first flange. At the same time, a second buckle protruding in the radial direction and capable of radial elastic reset is provided on the outer sheath. The protrusions of the first buckle and the second buckle are engaged or separated to form a first buckle group. In some embodiments of the present disclosure, the orientation of the first buckle is parallel to the axial direction of the inner sheath, or the orientation of the first buckle is at a certain angle to the axial direction of the inner sheath.

[0011] In some or one embodiment of the triggering mechanism disclosed herein, a first buckle protruding in the circumferential direction is provided on the first flange, and a second buckle protruding in the circumferential direction and capable of circumferential elastic reset is provided on the outer sheath. The protrusions of the first buckle and the second buckle engage or disengage to form a first buckle group.

[0012] In some or one embodiment of the trigger mechanism of the present disclosure, one end of the inner sheath is provided with a first flange, and the first flange is provided with a first buckle protruding towards the radial direction and capable of being elastically reset in the radial direction. Meanwhile, the outer sheath is provided with a second buckle protruding towards the radial direction, and the protruding parts of the first buckle and the second buckle are engaged or separated to form a first buckle group.

[0013] In some or one embodiment of the trigger mechanism of the present disclosure, one end of the inner sheath is provided with a first flange, and the first flange is provided with a first buckle protruding towards the radial direction and capable of being elastically reset in the radial direction. Meanwhile, the outer sheath is provided with a second buckle protruding towards the radial direction, and the protruding parts of the first buckle and the second buckle are engaged or separated to form a first buckle group.

[0014] In some or one embodiment of the trigger mechanism of the present disclosure, the first buckle group can be radially or circumferentially separated by the force of the first trigger part, and the elastically reset first buckle or the elastically reset second buckle can be provided on the inner sheath or the outer sheath. The present disclosure can be triggered by the force of the first trigger part, which can improve the accuracy, sensitivity, stability and reliability of the trigger.

[0015] In some or one embodiment of the trigger mechanism of the present disclosure, the first buckle group formed by the first buckle and the second buckle can also be a group of buckles formed by the engagement of the recessed part and the protruding part.

[0016] In some or one embodiment of the trigger mechanism of the present disclosure, the first trigger part is further provided with a trigger sleeve at the end away from the first buckle group for loading the first trigger part. The trigger sleeve can be integral or non-integral. The integral trigger sleeve is provided in one piece, and the non-integral trigger sleeve is provided in segments or discontinuously. The non-integral trigger sleeve can only be provided with a trigger sleeve at the position of the first buckle group, and the trigger sleeves at other positions are independent of each other.

[0017] In some or one embodiment of the trigger mechanism of the present disclosure, the distal end of the first trigger part is provided with an inclined second guide part, and the first buckle group is provided with an inclined first guide part matched with the second guide part.

[0018] In some or one embodiment of the trigger mechanism of the present disclosure, only the distal end of the first trigger part is provided with an inclined second guide part, or only the first buckle group is provided with an inclined first guide part. The first guide part and the second guide part cause the first buckle group to separate, thereby causing the inner sheath and the outer sheath to separate and disengage.

[0019] In some or one embodiment of the trigger mechanism of the present disclosure, the first guide part or the second guide part includes but is not limited to the following inclination modes: the first guide part or the second guide part is provided as a single plane or a conical body or an arc body with a contracted end or a slanted body with at least two inclined surfaces forming a contracted end, or a slanted body formed by any one or a combination of the above forms.

[0020] In some or one embodiment of the present disclosure, the number of the first buckle groups is at least one, and the number of the first trigger parts matches the number of the first buckle groups.

[0021] In some or one embodiment of the present disclosure, one end of the inner sheath is provided with a barrier, or the barrier is part of the inner sheath cylinder wall, such as being provided on the non-main side of the first flange, and the barrier is provided with a first guide part for guiding the movement of the trigger sleeve, or the inner sheath is provided with a first guide part for guiding the movement of the trigger sleeve, and the trigger sleeve is provided with a first groove that cooperates with the first guide part to prevent the trigger sleeve from moving or deviating circumferentially.

[0022] In some or one embodiment of the present disclosure, the inner sheath or the barrier is provided with a third elastic arm in the form of an inclined inner protrusion, which can also be used to engage the trigger sleeve or the first trigger part to prevent it from coming out of the inner sheath. The third elastic arm is elastically inclined inward to facilitate the sleeving installation of the trigger sleeve or the first trigger part, and after the sleeving is completed, the third elastic arm returns to its original state, and the free end of the third elastic arm locks the trigger sleeve or the first trigger part in its sleeving space.

[0023] In some or one embodiment of the present disclosure, the first buckle is also provided with a side block extending from the first flange or the back of the first flange, and the side block cooperates with the protruding part of the first buckle to form a concave body, which can strengthen the structure of the first buckle and make it more secure.

[0024] The present disclosure also provides a safety protection device, which further comprises a locking structure and an elastic body. The locking structure is arranged on the outer sheath and the inner sheath, and forms an engagement position through the cooperation of the outer sheath and the inner sheath to prevent the relative displacement of the outer sheath and the inner sheath. The elastic body is connected between the inner sheath and the outer sheath, so that the inner sheath and the outer sheath have a tendency to separate from each other.

[0025] In some or one embodiment of the safety protection device of the present disclosure, the locking structure comprises a first protrusion and / or a second protrusion arranged in sequence on the main body of the inner sheath, and the first protrusion and / or the second protrusion are arranged in sequence in the direction away from the first flange. The locking structure further comprises a locking position arranged on the outer sheath for accommodating and preventing the axial movement of the first protrusion; the outer sheath is provided with a first elastic arm that can prevent the first protrusion from retreating axially; and the elastic body is arranged between the second protrusion of the inner sheath and the outer sheath.

[0026] In some or one embodiment of the safety shield of the present disclosure, the inner side of the outer sheath is provided with a guide channel for sleeving the first and second protrusions; one end of the outer sheath is provided with a movable end cap or an integral end cap; the end cap is a hollow end cap for accommodating the needle to pass through, and the hollow end cap is provided with an inner circumferential stopper inwardly extending from the end thereof for placing the elastic body; the inner circumferential stopper is provided to better stabilize the elastic body, and the elastic body can be a spring ring.

[0027] In the present disclosure, the elastic body is sleeved on the inner sheath body and positioned by the second protrusion of the inner sheath; after the first protrusion on the inner sheath is sleeved on the main part of the outer sheath along the inner guide part provided on the outer sheath, the inner sheath or the outer sheath is rotated to make the first elastic arm abut against the first protrusion until the first protrusion is rotated into the corresponding notch so that the first protrusion is locked by the notch and cannot axially slide.

[0028] In some or one embodiment of the safety shield of the present disclosure, the first protrusion, the first elastic arm and the second protrusion are each provided with at least one.

[0029] The present disclosure also provides a safety syringe comprising any of the safety shields as described above, and further comprising a syringe barrel loaded on the inner sheath via a flange and a piston rod loaded in the syringe barrel for sealing and pushing and pulling the injection liquid.

[0030] In some or one embodiment of the safety syringe of the present disclosure, the hand holding end of the piston rod is provided with a second flange which is locked by the third elastic arm, and the first flange is further provided with a first tab protruding towards the inside of the inner sheath for locking the syringe flange, and a second axial space for accommodating the flange is formed between the first tab and the first flange. In some embodiments of the present disclosure, the third elastic arm is further provided with a side rib for reinforcement; when the hand holding end of the piston rod is continuously pushed under force, the second flange pushes the first trigger part to move close to one side of the trigger sleeve at the same time and / or after triggering the third elastic arm, so that the first buckle is separated and the second flange is locked in the first axial space of the third elastic arm, the first tab has a certain elastic deformation capacity together with its supporting part or connecting part, so that the syringe flange can be locked, and the inclined surface of the first tab facilitates the syringe flange to enter the accommodation space.

[0031] In some or one embodiment of the safety syringe of the present disclosure, the first flange is provided with a second guide part on the inner side for guiding the trigger sleeve, and the trigger sleeve is provided with a second groove matched with the second guide part.

[0032] In some or one embodiment of the safety syringe of the present disclosure, the body of the first tab is the second guide part.

[0033] The present disclosure also provides a mounting method of a safety syringe, comprising the following steps:

[0034] S1: loading the syringe barrel loaded with the drug liquid and sealed by the piston rod push-pull on the inner sheath;

[0035] S2: connecting the elastic sleeve to the second protrusion of the inner sheath;

[0036] S2: loading the inner sheath loaded with the elastic body on the outer sheath, and engaging the inner sheath and the outer sheath through the first buckle group.

[0037] Compared with the prior art, the trigger mechanism of the present disclosure has the following advantages:

[0038] The trigger mechanism is simple in structure, only the first trigger part or the trigger sleeve containing the first trigger part is arranged at the engagement position of the inner sheath and the outer sheath, and when the syringe is lowered to complete the injection, the first trigger part or the trigger sleeve can be triggered or pushed to move, so that the inner sheath and the outer sheath can be reliably separated, avoiding the waste of drug liquid caused by unstable triggering or triggering failure, and the trigger mechanism of the present disclosure is convenient to install and connect, and does not complicate the manufacture of other corresponding parts.

[0039] The safety syringe has the following actions:

[0040] The trigger sleeve is connected to the inner sheath and aligned with the engagement position of the first buckle group, and slides through the guide, the flange of the syringe barrel is defined by the first tab so that the syringe barrel and the inner sheath move in and out together; the first buckle group connects the inner sheath and the outer sheath together; the piston rod in the syringe barrel moves to perform injection until the injection is completed, the piston rod is pushed to the bottom position or near the bottom position or the preset position of the syringe barrel, and at the same time, the second flange arranged on the piston rod touches the first trigger part or the trigger sleeve provided with the first trigger part, the first trigger part or the trigger sleeve moves downward to make the first buckle group disengage, the second flange continues to move downward until it is engaged in the space of the third elastic arm, so that the syringe barrel and the piston rod are fixed by the inner sheath or are held by the inner sheath to drive and disengage from the outer sheath, until the inner sheath moves to the locking position and is locked, thus completing this injection, and the needle is withdrawn into the outer sheath and the piston rod is locked in the inner sheath, achieving needle protection and preventing drug liquid from leaking through the sliding of the piston rod.

[0041] The safety syringe has the following advantages:

[0042] While achieving convenient installation, stable and reliable triggering, and reliable needle protection, the piston rod can be locked at the same time to prevent residual liquid from leaking. BRIEF DESCRIPTION OF DRAWINGS

[0043] A more complete understanding of the present disclosure and the attendant advantages and features thereof will be more readily understood by reference to the following detailed description, taken in conjunction with the accompanying drawings, wherein:

[0044] Figure 1 is a sectional view of the trigger mechanism after being cut open;

[0045] Figure 2 is a sectional view of the trigger mechanism after being cut open; Figure 1 is an enlarged view of a detail of

[0046] Figure 3 is a sectional view of the trigger mechanism after being cut open;

[0047] Figure 4 is a sectional view of the trigger mechanism after being cut open;

[0048] Figure 5 is a sectional view of the trigger mechanism after being cut open;

[0049] Figure 6 is a sectional view of the trigger mechanism after being cut open;

[0050] Figure 7 is a sectional view of the trigger mechanism after being cut open;

[0051] Figure 8 is a sectional view of the trigger mechanism after being cut open;

[0052] Figure 9 is a sectional view of the trigger mechanism after being cut open;

[0053] Figure 10 is a sectional view of the trigger mechanism after being cut open;

[0054] Figure 11 is an enlarged view of a detail of Figure 10

[0055] Figure 12 is a sectional view of the trigger mechanism after being cut open;

[0056] Figure 13 is a sectional view of the trigger mechanism after being cut open;

[0057] Figure 14 is a sectional view of the trigger mechanism after being cut open;

[0058] Figure 15 is an enlarged view of a detail of Figure 14

[0059] Figure 16 is an enlarged view of a detail of

[0060] Figure 17 is an enlarged view of a detail of

[0061] ​​Figure 18 is a cross-sectional structure schematic diagram of a safe syringe after injection is completed;

[0062] In the drawings: 1 is an inner sheath, 11 is a first flange, 11a is a first buckle, 11m is a third elastic arm, 11b is a side stop, 11p is a first tongue, 116 is a second guide part, 14 is a surrounding stop, 141 is a first guide part, 2 is an outer sheath, 21 is a second buckle, 211 is a first guide part, 12 is a first protrusion, 13 is a second protrusion, 24 is a first elastic arm, 241 is a side rib, 25 is a guide channel, 27 is an end cover, 271 is an inner surrounding stop, 29 is a locking position, a is a first buckle group, 3 is a trigger sleeve, 31 is a first trigger part, 311 is a second guide part, 32 is a first slot body, 33 is a second slot body, 4 is an elastic body, 5 is a syringe barrel, 51 is a flange of the syringe barrel, 6 is a piston push rod, 61 is a second flange, n is a first axial space, w is a second axial space, 7 is a needle sheath.

[0063] It should be noted that the drawings are used to illustrate the present disclosure, not to limit the present disclosure. Note that the drawings representing the structure may not be drawn to scale. DETAILED DESCRIPTION

[0064] In order to make the content of the present disclosure clearer and easier to understand, the following specific embodiments and drawings are used to explain the present disclosure. Figure 1 ~ Appendix Figure 18 The content of the present disclosure is described in detail; the following examples are used to illustrate the present disclosure, but not to limit the scope of the present disclosure.

[0065] Example 1:

[0066] As shown in the drawings, Figures 1-3 The present disclosure provides an embodiment of a trigger mechanism, which is arranged on an inner sheath 1 and / or an outer sheath 2 connected with each other, and a corresponding end of the inner sheath 1 and the outer sheath 2 is provided with a first buckle group a, each buckle of the first buckle group a is arranged on the inner sheath 1 and the outer sheath 2 and can be buckled or separated with each other, and further comprising a first trigger part 31, at least part of the first trigger part 31 can be buckled into the first buckle group a, or the first trigger part 31 can be aligned with the first buckle group a; when an external force pushes, the first trigger part 31 moves to separate the buckled first buckle group a from each other, so that the inner sheath and the outer sheath can be stably and reliably separated from each other, as shown in the drawings, Figure 10 、 Figure 12 、 Figure 14 as shown.

[0067] In some or certain embodiments, the first trigger part 31 can be buckled into the first buckle group a, and when the first trigger part 31 moves under the pushing force, the buckled first buckle group a can be separated from each other.

[0068] AsFigure 3 In one embodiment shown, one end of the inner sheath 1 is provided with a first flange 11, and a first buckle 11a is provided on the first flange 11. The first buckle 11a is arranged parallel to the inner sheath 1 axially and protrudes radially inward. The outer sheath 2 is provided with a second buckle 21, which protrudes radially outward and can be elastically reset. When the first trigger part 31 moves downward, the engaged first buckle 11a and second buckle 21 separate, thereby disengaging the inner sheath 1 from the outer sheath 2.

[0069] In some or certain embodiments, the orientation of the first buckle group a, consisting of the first buckle 11a and the second buckle 21, is reversed compared to the figures in this disclosure. For example, the first buckle 11a can be elastically reset, or the first buckle 11a protrudes outward and the second buckle 21 protrudes inward. In some or certain embodiments, the first buckle 11a and the second buckle 21 can be circumferentially convex and concave or circumferentially mating. In this case, the first trigger part 31 is also set as a gradient surface corresponding to the mating surface of the first buckle group a. When the first buckle 11a and the second buckle 21 are circumferentially mated, the first trigger part 31 extends into the mating surface of the first buckle 11a and the second buckle 21 and triggers the inner sheath 1 and the outer sheath 2 to rotate circumferentially and disengage. The above structure also falls within the protection scope of this triggering mechanism and is not shown in this figure.

[0070] The end of the first trigger part 31 away from the first latch group a also forms a trigger sleeve 3 for mounting the first trigger part 31; the trigger sleeve 3 can be integral or non-integral, and in some or certain embodiments, it is specifically as shown in the attached figure. Figures 5-6 The trigger sleeve 3 shown is not a single unit; when the trigger sleeve 3 is not a single unit, each part of the trigger sleeve 3 is independent of the others. Furthermore, the trigger sleeve 3 is integrated with the first trigger part 31, specifically as follows... Figure 6 As shown, the trigger sleeve 3 becomes an integral part of the first trigger part 31, or it can be understood that the function of the trigger sleeve 3 can be completed without the trigger sleeve 3. For example, the first trigger part 31 alone can trigger the buckle assembly, thereby causing the inner sheath 1 and the outer sheath 2 to disengage. Of course, the better performance comes from the fact that the trigger sleeve 3 is an integral design, such as... Figure 4 As shown, attached Figures 5-6 The number of first trigger parts 31 shown is not necessarily required. For example, when only one first buckle 11a is provided, the first trigger part 31 can be provided in only one place or only one.

[0071] As attached Figure 2 As shown, the distal end of the first trigger part 31 is provided with an inclined second guide part 311 or / and the first latching assembly a is provided with an inclined first guide part 211 that cooperates with the second guide part 311. The arrangement of the first guide part 211 and the second guide part 311 makes the first latching assembly a easier to separate or separate, as shown in the attached figure. Figure 2As shown, the second guide part 311 and the first guide part 211 are cooperatively arranged to facilitate the triggering of separation, as shown in FIG. 8. Figure 3 As shown, if only the first guide part 211 is arranged on the second buckle 21, and the first triggering part 31 is not provided with a guide part, the triggering of separation is still facilitated.

[0072] In some or certain embodiments, the first guide part 211 or the second guide part 311 is a single plane or a conical or arc surface or a surface formed by at least two inclined surfaces arranged in an inclined manner; of course, the inclined arrangement of the first guide part 211 or the second guide part 311 is not limited to the above.

[0073] In some or certain embodiments, one end of the inner sheath is provided with a surrounding barrier 14, as shown in FIG. 6. Figure 7 Figure 8 Figure 10 Figure 11 As shown in FIG. 7, the non-main body side of the first flange 11 is provided with a surrounding barrier 14, and the surrounding barrier 14 is provided with a first guide part 141 for guiding the triggering sleeve, and the triggering sleeve 3 is provided with a first groove 32, and the first groove 32 cooperates with the first guide part 141 to prevent the triggering sleeve 3 from moving or shifting circumferentially, as shown in FIG. 8; of course, the first guide part 141 in certain embodiments can not be limited to the form shown in the figure, and various forms such as a square cross-section or intermittent first guide part 141 can be used. Figure 4

[0074] In some or certain embodiments, as shown in FIG. 9, Figure 7 Figure 10 As shown in FIG. 9, the surrounding barrier 14 is provided with a third elastic arm 11m inclined inwardly toward the first flange 11, and the third elastic arm 11m is used to clamp or sleeve the first triggering part 31 or the triggering sleeve 3 provided with the first triggering part 31 in its accommodation space, so as to prevent the first triggering part 31 or the triggering sleeve 3 provided with the first triggering part 31 from moving away from the first buckle group a and disengaging; in some or certain embodiments, the following non-limiting example settings can be made: for example, the inner diameter of the inner protruding point of the third elastic arm 11m can be smaller than the outer diameter of the corresponding position of the triggering sleeve 3, and the triggering sleeve 3 does not overlap with the third elastic arm 11m in the axial direction, or the triggering sleeve 3 is spaced apart from the third elastic arm 11m by a certain excess distance, or the end surface of the triggering sleeve 3 abuts against the end surface of the third elastic arm 11m, etc.

[0075] In some or certain embodiments, as shown in FIG. 10, Figure 8 As shown in FIG. 10, the first buckle 11a is further provided with a side barrier 11b, and the side barrier 11b cooperates with the protruding part of the first buckle 11a to form a concave body for accommodating the first triggering part 31.

[0076] Embodiment 2 ​​​​​

[0077] A safety protection device comprising the trigger mechanism, further comprising the trigger sleeve 3 or the first trigger part 31, further comprising the inner sheath 1 and the outer sheath 2 which are mutually coupled or separated, and the outer sheath 2 and the inner sheath 1 are provided with locking structures and the elastic body 4 which has a tendency to move away, in some or certain embodiments, the safety protection device can be triggered by the first trigger part 31 or the trigger sleeve 3 when an external force is applied, so that the first buckle group a is separated, and the outer sheath 2 and the inner sheath 1 move away from each other or one of them under the elastic release of the elastic body 4, and the locking structures provided on the outer sheath 2 and the inner sheath 1 prevent them from moving away further after a certain distance, at this time the inner sheath 1 is relatively retracted into the outer sheath 2, thereby realizing the safety protection function.

[0078] Specifically, the following but not limited to the following implementation ways: the inner sheath 1 body is provided with a first protrusion 12 and a second protrusion 13 in sequence in the direction away from the first flange 11, the inner side of the outer sheath 2 is provided with a guide channel 25, the guide channel 25 is used to facilitate the sleeve connection of the first protrusion 12 and the second protrusion 13 of the inner sheath 1, the outer sheath is further provided with a locking position 29, the locking position 29 is used to accommodate and prevent the first protrusion from moving axially after being guided to the position, the outer sheath 2 is provided with a first elastic arm 24 which can be elastically reset and can be convexly prevented from moving backward in the axial direction of the first protrusion 12, one end of the outer sheath 2 away from the first buckle group a is provided with an end cover 27, the end cover 27 is movably sleeved on the outer sheath 2 or integrally provided with the outer sheath 2; the end cover 27 is a hollow end cover to accommodate the needle to pass through, and the elastic body 4 can be elastically sleeved between the second protrusion 13 and the end cover 27 of the outer sheath 2. The hollow end cover is provided with an inner circumferential stop 241 which can place the elastic body 4 and extend inward from the end of the hollow end cover, and the inner circumferential stop 241 can prevent the spring from jumping off, and it can be seen that Figures 10-14 、 Figures 16-18 ; the first elastic arm 24 can be preferably provided in the corresponding window or cutout of the outer sheath 2, of course, the first elastic arm 24 can also be provided on the outer sheath 2 in other ways.

[0079] In the present disclosure, the first protrusion 12, the first elastic arm 24 and the second protrusion 13 are not specifically noted or described, and each of them can be provided with at least one.

[0080] Embodiment 3

[0081] A safety syringe comprising the safety protection device, further comprising a syringe barrel 5 and a piston push rod 6, as shown in the drawings, the syringe barrel 5 is loaded in the inner sheath 1, and the syringe barrel 5 is provided with a flange 51, and the piston push rod 6 is loaded in the syringe barrel 5 for sealing and pushing and pulling the injection liquid.

[0082] In some or certain embodiments, it can be seen that Figures 10-14 、 Figures 16-18As shown, the hand-held end of the piston rod 6 is provided with a second flange 61, and the third elastic arm 11m provided on the inner sheath 1 is axially spaced from the trigger sleeve 3 or the first trigger portion 31 after the force is applied, and a first axial space n is formed in the axial direction, which is used to lock the second flange 61, and the first axial space n can completely or just accommodate the second flange 61 and completely block it from being axially moved; the first flange 11 is further provided with a first elastic tongue 11p protruding towards the inside of the inner sheath 1 and used to lock the flange 51, and the first elastic tongue 11p is elastically deformed together with its support or connecting part so that the syringe flange 51 can be locked, and the inclined surface of the first elastic tongue 11p facilitates the syringe flange 51 to be pressed into its accommodation space.

[0083] The first flange 11 is provided with a second guide portion 116 guiding the trigger sleeve 3 from the inside, and the trigger sleeve 3 is provided with a second groove 33 matched with the second guide portion 116. In this embodiment, the body of the first elastic tongue 11p is the second guide portion 116.

[0084] In this embodiment of the present disclosure, the safety syringe operates as follows:

[0085] The trigger sleeve 3 is sleeved on the inner sheath 1 and aligned with the engagement position of the first buckle group a, and slides through the guidance of 141, and the flange 51 of the syringe barrel 5 is defined by the first elastic tongue 11p so that the syringe barrel 5 advances and retreats with the inner sheath 1; the first buckle group a sleeves the inner sheath 1 and the outer sheath 2 together; the piston rod 6 in the syringe barrel 5 moves to perform injection until the injection is completed, and the piston rod 6 is pushed to the bottom position or the position close to the bottom position or the preset position of the syringe barrel 5, and the second flange 61 provided on the piston rod 6 touches the first trigger portion 31 or the trigger sleeve 3 provided with the first trigger portion 31, and the first trigger portion 31 or the trigger sleeve 3 moves downward to make the first buckle group a disengage, and the second flange 61 continues to move downward until it is clamped in the space n of the third elastic arm 11m, so that the syringe barrel 5 and the piston rod 6 are fixed by the inner sheath 1 or are held by the inner sheath 1 to drive the outer sheath 2, until the inner sheath 1 moves to the locking position 29 and is locked, so that the injection is completed, the needle is retracted into the outer sheath 2, and the piston rod 6 is locked in the inner sheath 1, the needle protection is realized, and the leakage of the drug through the sliding of the piston rod 6 is prevented; as shown in Figures 10-14 、 Figures 16-18 .

[0086] Embodiment 4

[0087] A mounting method of a safety syringe, comprising the following steps:

[0088] S1: load the syringe barrel 5 loaded with the medicine liquid and sealed by the piston rod 6 on the inner sheath 1;

[0089] S2: sleeve the elastomer 4 on the second protrusion 13 of the inner sheath 1;

[0090] S2: load the inner sheath 1 loaded with the elastomer 4 on the outer sheath 2, and buckle the inner sheath 1 and the outer sheath 2 via the first buckle group a.

[0091] It can be understood that, although the present disclosure has been disclosed as above with the preferred embodiments, the above embodiments are not intended to limit the present disclosure. For any person skilled in the art, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present disclosure without departing from the content of the technical solution of the present disclosure, all still belong to the protection scope of the technical solution of the present disclosure; each individual variant described and shown in the text has independent components and features, which can be easily separated or combined with the features of any other several embodiments without departing from the scope of the claims of the present disclosure.

[0092] In addition, the indicated orientation or position relationship described in the present disclosure is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the indicated device or structure must have a specific orientation or be operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure.

[0093] Without using exclusive terms, the term "comprising" in the claims related to the present disclosure should allow the inclusion of any additional elements, regardless of whether a certain number of elements or features is enumerated in such claims; all technical and scientific terms used in the text are provided with the meaning of the broad ordinary understanding, except as specifically defined in the disclosure, while maintaining the validity of the claims.

[0094] The terms "main" and "secondary" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "main" and "secondary" can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "several" is one or two or more, unless otherwise explicitly and specifically limited.

[0095] Similarly, the terms "first" and "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "several" is two or more, unless otherwise explicitly and specifically limited.

[0096] In this disclosure, unless specifically defined and limited otherwise, the terms "mounting", "setting", "connecting", "fixing", "screwing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two components or the interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in this disclosure can be understood according to the specific circumstances. And it can be directly on another component or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly connected to another component or indirectly connected to another component.

[0097] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

Claims

1. A triggering mechanism, comprising an inner sheath (1) and an outer sheath (2) connected by an inner sleeve (1) and an outer sheath (2), wherein corresponding ends of the inner sheath (1) and the outer sheath (2) are respectively provided with a first latching group (a) that engages with each other, and further comprising a first triggering part (31) disposed at the position of the first latching group (a) and insertable into the first latching group (a), wherein the first triggering part (31) is pushed by a force to cause the first latching group (a) that engages with each other to separate and disengage; One end of the inner sheath (1) is provided with a first flange (11), and a first buckle (11a) is provided on the first flange (11). The outer sheath (2) is provided with a second buckle (21). The first buckle (11a) and the second buckle (21) form a first buckle group (a). The first trigger part (31) is further provided with an integral or non-integral trigger sleeve (3) for loading the first trigger part (31) at one end away from the first latch group (a); a barrier (14) is provided at one end of the inner sleeve (1), and a third elastic arm (11m) is provided on the barrier (14) for engaging the trigger sleeve (3) or the first trigger part (31) by tilting and protruding. Also includes: A locking structure that is provided on the outer sheath (2) and the inner sheath (1) in cooperation to prevent the outer sheath (2) and the inner sheath (1) from shifting relative to each other, and an elastic body (4) that is elastically connected between the inner sheath (1) and the outer sheath (2); It also includes a syringe barrel (5) mounted in the inner sheath (1) and a piston rod (6) mounted in the syringe barrel (5) for sealing and pushing / pulling the injected drug; The piston rod (6) is provided with a second flange (61) at the hand-held end, which is locked by the third elastic arm (11m). The first flange (11) is also provided with a first tongue (11p) protruding toward the inside of the inner sheath (1) for locking the syringe barrel flange. A second axial space (w) for accommodating the flange is formed between the first tongue (11p) and the first flange (11).

2. The triggering mechanism according to claim 1, characterized in that, The first flange (11) is provided with a first buckle (11a) that is arranged parallel to the axial direction of the inner sleeve (1) or at a certain angle to the axial direction of the inner sleeve (1), and the outer sleeve (2) is provided with a second buckle (21) that is arranged radially or circumferentially, protruding or recessed and capable of radially or circumferentially elastically resetting; or, the first flange (11) is provided with a first buckle (11a) that is arranged radially or circumferentially, protruding or recessed and capable of radially or circumferentially elastically resetting, and the outer sleeve (2) is provided with a second buckle (21) that is arranged radially or circumferentially, protruding or recessed.

3. The triggering mechanism according to claim 2, characterized in that, The first trigger part (31) is provided with an inclined second guide part (311) at its distal end or / and the first latching group (a) is provided with an inclined first guide part (211) that cooperates with the second guide part (311), and the first guide part (211) or / and the second guide part (311) causes the first latching group (a) to separate.

4. The triggering mechanism according to claim 2, characterized in that, The enclosure (14) is provided with a first guide part (141) for guiding the movement of the trigger sleeve (3), and the trigger sleeve (3) is provided with a first groove (32) that cooperates with the first guide part (141) to prevent the trigger sleeve (3) from shifting or moving circumferentially.

5. A safety protection device, comprising the triggering mechanism as described in any one of claims 1 to 4, characterized in that, The locking structure includes a first protrusion (12) and / or a second protrusion (13) sequentially arranged on the inner sleeve (1) body in a direction away from the first flange (11), and a locking position (29) provided on the outer sleeve for accommodating and preventing the first protrusion from moving axially; the outer sleeve (2) is provided with a first elastic arm (24) that can prevent the first protrusion (12) from moving axially backward; the elastic body (4) is disposed between the second protrusion (13) of the inner sleeve (1) and the outer sleeve (2).

6. The safety protection device according to claim 5, characterized in that, The inner side of the outer sheath (2) is provided with a guide channel (25) for sleeved with the first protrusion (12) and the second protrusion (13).

7. The safety protection device according to claim 5, characterized in that, One end of the outer sheath (2) is provided with an end cap (27) that is movably sleeved or integrally formed to accommodate the needle passing through; the end cap (27) is a hollow end cap, and an inner enclosure (271) for placing an elastomer (4) is provided inside the hollow end cap.

8. A safety syringe, comprising the safety protection device as described in any one of claims 5 to 7, characterized in that, The first flange (11) is provided with a second guide part (116) that guides the trigger sleeve (3) from the inside, and the trigger sleeve (3) is provided with a second groove (33) that cooperates with the second guide part (116).

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