Unlocking pressing structure and connected needleless injector

Abstract

The utility model discloses an unlocking and pressing structure and a connected needleless injector, and relates to the technical field of injectors, the unlocking and pressing structure comprises an unlocking piece which abuts against a linkage piece and can drive the linkage piece to move when the unlocking piece moves; the linkage piece comprises an abutting end and a limiting end, and the limiting end can make contact with the end face of the pressing piece; and the pressing piece is linked with the push rod piece through the elastic piece, so that the first air channel is blocked and released by the push rod piece. The disposable syringe has the beneficial effects that the first air passage can be blocked and released through the matching between the unlocking piece and the linkage piece, so that the purposes of extracting liquid medicine and injecting the liquid medicine can be achieved; meanwhile, a horizontal pressing mode is adopted to replace an overturning pressing mode, so that the operation of a worker is better facilitated; and the production and assembly processes of manufacturing equipment are simpler and more efficient.

Description

Technical Field

[0001] This utility model relates to the field of syringe technology, and in particular to an unlocking and pressing structure and a connection to a needleless syringe. Background Technology

[0002] Needle-free injectors eliminate the need for needles. Instead, they are medical devices that inject liquid medications under high pressure through micro-holes at the tip, thus sparing patients the pain of needle pricks. Compared to needle injectors, needle-free injectors offer many advantages, such as reducing pain and alleviating patients' fear of needles.

[0003] Existing needleless injectors use a button that flips along the end connecting shaft for injection, but the syringe handle has a curved structure, which makes it difficult to machine and position when making shaft holes for the connecting shaft, which is not conducive to the mass production of needleless injectors. Utility Model Content

[0004] In view of the above-mentioned problems in the prior art, this utility model is proposed.

[0005] The purpose of this invention is to provide an unlocking and pressing structure, which aims to solve the problem that the curved surface structure of the needle-free injector handle makes it difficult to process the shaft hole, thus hindering mass production.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an unlocking pressing structure, which includes an unlocking component that abuts against a linkage component, wherein the unlocking component can drive the linkage component to move when it moves;

[0007] The linkage includes an abutting end and a limiting end, the limiting end being capable of contacting the end face of the pressing element; and,

[0008] The pressing component, through the linkage between the elastic component and the push rod component, thereby achieving the blocking and release of the first air passage by the push rod component.

[0009] As a preferred embodiment of the unlocking and pressing structure of this utility model, a sealing block is sleeved on the outer side of the push rod;

[0010] The sealing block has a second air passage inside, and the push rod passes through the second air passage and extends to its outer side;

[0011] The push rod moves along the axis of the second air passage;

[0012] The elastic element is sleeved on the outer wall of the push rod.

[0013] As a preferred embodiment of the unlocking and pressing structure of this utility model, the push rod includes a sealing end disposed at its end;

[0014] The sidewall of the sealing end has a curved structure, thereby increasing the contact area between the sealing end and the opening at the end of the first airway.

[0015] As a preferred embodiment of the unlocking and pressing structure of this utility model, the sealing block includes movable grooves and snap-fit ​​slots at both ends;

[0016] A sealing gasket surrounds the connection between the push rod and the sealing end;

[0017] The sealing gasket is located inside the movable groove, and the second air passage can block the sealing gasket.

[0018] As a preferred embodiment of the unlocking and pressing structure of this utility model, the pressing member abuts against the end of the push rod member to push the blocking end to block the first air passage;

[0019] The sealing gasket is separated from the bottom surface of the snap-fit ​​groove, and the second air passage is unobstructed.

[0020] As a preferred embodiment of the unlocking pressing structure of this utility model, the pressing component includes a snap-fit ​​component disposed on one side thereof;

[0021] The end of the snap-fit ​​component is embedded inside the snap-fit ​​groove, and the snap-fit ​​component is limited by the snap-fit ​​groove.

[0022] As a preferred embodiment of the unlocking and pressing structure of this utility model, the end face of the unlocking component is provided with a guide component;

[0023] The guide member limits the unlocking member, thereby enabling the unlocking member to move in the vertical direction.

[0024] In a preferred embodiment of the unlocking and pressing structure of this utility model, the linkage moves along the constraint trajectory of the guide member, thereby achieving the separation of the limiting end from the end face of the pressing member.

[0025] As a preferred embodiment of the unlocking and pressing structure of this utility model, a reset element is sleeved on the outer wall of the contact end;

[0026] The unlocking component is restored to its normal working state by the reset component.

[0027] The beneficial effects of the unlocking and pressing structure of this utility model are as follows: This utility model can achieve the blocking and release of the first airway through the cooperation between the unlocking part and the linkage part, thereby achieving the purpose of extracting and injecting liquid medicine; at the same time, the use of horizontal pressing instead of flipping pressing makes it easier for staff to operate; and it is also simpler and more efficient in the production and assembly process of the manufacturing equipment.

[0028] Another objective of this invention is to provide a connector for a needleless injector, which aims to solve the problem of cross-infection caused by the reciprocating use of the metal injection head of existing needleless injectors when sterilization environments and conditions are limited.

[0029] To solve the above-mentioned technical problems, the present invention also provides the following technical solution: a needle-free injector connection, which includes an unlocking and pressing structure; and a housing and a handle disposed at the bottom of the side wall of the housing;

[0030] The dosage adjustment component is linked to the pneumatic component. The extension length of the rotary plug at the end of the dosage adjustment component is adjustable, thereby controlling the injection volume of the drug solution.

[0031] The pneumatic component works in conjunction with the dosage adjustment component to inject the drug solution;

[0032] The end of the outer shell is detachably mounted with an injection assembly, and the impact rod at the end of the pneumatic assembly penetrates the inside of the injection assembly.

[0033] The grip includes an air chamber, a limiting chamber, and a sliding chamber;

[0034] The linkage component passes through the limiting cavity and extends to its outer side; the pressing component slides along the inner wall of the sliding cavity.

[0035] The advantages of this novel needleless injector are as follows: This novel injector uses replaceable injection heads and injection components, which can reduce cross-infection and avoid dangerous accidents caused by metal fatigue. At the same time, the medical-grade polymer environmentally friendly material is more stable and safer than metal injection heads, and can also maintain the purity of the drug solution. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the unlocked state in this utility model.

[0038] Figure 2 This is a schematic diagram of the locking state in this utility model.

[0039] Figure 3 This is a cross-sectional view of the connection of the needleless injector in this utility model.

[0040] Figure 4 In this utility model Figure 3A magnified view of part A.

[0041] Figure 5 This is a schematic diagram of the connection structure between the injection component and the dosage adjustment component in this utility model.

[0042] Figure 6 This is a three-dimensional structural diagram of the syringe in this utility model. Detailed Implementation

[0043] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0046] Example 1

[0047] Reference Figure 1 This is the first embodiment of the present invention, which provides an unlocking press structure.

[0048] Specifically, the unlocking and pressing structure 100 includes: an unlocking component 101, a linkage component 102, and a pressing component 103. The unlocking component 101 abuts against the linkage component 102, and the movement of the unlocking component 101 can drive the linkage component 102 to move. The linkage component 102 includes an abutting end 102a and a limiting end 102b, and the limiting end 102b can contact the end face M of the pressing component 103. The pressing component 103 is linked with the push rod component 105 through the elastic component 104, thereby realizing the blocking and release of the first air passage S by the push rod component 105.

[0049] The unlocking and pressing structure in this embodiment is designed to ensure the safe use of the device and reduce the risks caused by improper operation; at the same time, the horizontal pressing method allows for simple and efficient assembly during the syringe manufacturing process.

[0050] In this embodiment, the unlocking component 101 is a block structure, and its specific function is to facilitate the operator to move the linkage component 102. The triggering method is to push with the fingertip.

[0051] The preferred structure of the linkage 102 is a rod-shaped structure, which is disposed inside the syringe handle. The linkage 102 penetrates the inner wall of the handle and is limited by the inner wall of the handle, so that the linkage 102 moves in a fixed direction. The end of the unlocking member 101 abuts against the bottom of the linkage 102. When the unlocking member 101 moves in the vertical direction, its end will push the abutting end 102a to move together.

[0052] The linkage 102 includes an abutment end 102a and a limiting end 102b. Preferably, the contact surface between the abutment end 102a and the unlocking member 101 is an arc-shaped structure. The arc-shaped structure can better ensure good contact between the end of the unlocking member 101 and the limiting end abutment end 102a, thereby ensuring that the unlocking member 101 can push the abutment end 102a to move during the movement, effectively preventing the contact between the unlocking member 101 and the linkage 102 from breaking.

[0053] The limiting end 102b and the linkage 102 combine to form an inverted L-shaped structure; the limiting end 102b and the linkage 102 can be integrally cast; the limiting end 102b can also be installed on one side of the end of the linkage 102 by bolt connection; the bolt connection method facilitates the installation of the linkage 102 in a small space and completes the assembly quickly.

[0054] In this embodiment, the pressing member 103 is a button structure with a hand grip. The end face M of the pressing member 103 is close to the side of the linkage member 102. The end of the limiting end 102b abuts against the end face M of the pressing member 103, thereby limiting the pressing member 103.

[0055] Furthermore, the movement of the pressing member 103 can be perpendicular to the running direction of the linkage member 102, and the push rod member 105 can be moved by moving laterally; or a pivot can be provided at the top corner of the pressing member 103, and the pressing member 103 can rotate along its pivot axis during the pressing member 103 is engaged. During the rotation, the contact surface at the center of the pressing member 103 presses the push rod member 105 and pushes the push rod member 105 to move laterally.

[0056] The limiting end 102b is perpendicular to the direction of the linkage 102 rod and extends a certain distance along its vertical direction; while restricting the movement of the pressing member 103, it can also satisfy the requirement that when the pressing member 103 is released from the limit, the pressing member 103 has a certain space to move towards the linkage 102.

[0057] Preferably, the movement of the limiting end 102b can be upward and offset from the end face M of the pressing member 103. In this case, the pressing member 103 is required to be hollow in the center position to provide a certain amount of movement space for the limiting end 102b. Alternatively, the limiting end 102b can be moved downward and offset from the end face M of the pressing member 103 to achieve the purpose of unlocking.

[0058] The push rod 105 moves in the same direction as the pressing member 103, and the push rod 105 is a rod-shaped structure; the elastic member 104 can be a spring structure or a metal spring sheet structure; under normal conditions, the rebound force of the elastic member 104 can push the pressing member 103 to move away from the push rod 105, thereby driving the pressing member 103 to reset.

[0059] Preferably, the elastic element 104 is installed by sleeve on the outside of the push rod 105, thereby preventing the elastic element 104 from bending laterally and losing stability when subjected to force, while enabling the elastic element 104 to withstand greater loads and maintain stable elastic performance.

[0060] Furthermore, after pushing the unlocking member 101 to move the end of the limiting end 102b away from the end face M of the pressing member 103, the pressing member 103 is engaged. After being subjected to force, the pressing member 103 first compresses the elastic member 104, and then pushes the push rod member 105 to move in a direction perpendicular to the linkage member 102; subsequently, the end of the push rod member 105 can block the first air passage S.

[0061] In this embodiment, the unlocking component 101 can limit the movement of the pressing component 103 under normal conditions, thereby effectively avoiding safety hazards caused by accidental operation; and the pressing component 103 blocks the first airway S during the pressing process, thereby controlling the injection of the medicine.

[0062] Example 2

[0063] Reference Figures 1-2 This is the second embodiment of the present invention, which differs from the first embodiment in that: it further includes a sealing block 107 disposed on the outer side of the push rod 105, and the movement direction of the push rod 105 can be limited by the sealing block 107; the sealing block 107 has a second air passage I opened along the axial direction of the push rod 105.

[0064] Specifically, the diameter of the second air passage I inside the sealing block 107 is slightly larger than the diameter of the push rod 105; the push rod 105 passes through the second air passage I, and the high-pressure gas located inside the housing can be discharged through the gap between the push rod 105 and the second air passage I.

[0065] Furthermore, the elastic element 104 is sleeved on the outer wall of the push rod 105, and the elastic element 104 and the push rod 105 are movably connected; under normal conditions, the end of the elastic element 104 does not contact the contact surface of the pressing element 103; when the pressing element 103 is pressed, the pressing element 103 moves towards the push rod 105, and as the pressing element 103 moves closer to the push rod 105, the elastic element 104 is gradually compressed and deformed.

[0066] In this embodiment, the push rod 105 includes a sealing end 105a disposed at its end; the side wall of the sealing end 105a has a curved structure, and the curved structure of the side wall of the sealing end 105a can increase the contact area with the end of the first air passage S; thereby improving the sealing effect of the device.

[0067] The end of 105a can be a sphere, a cylinder, or a cone; preferably a cone. During the process of the sealing end 105a engaging with the first airway S, the end of the sealing end 105a with the smaller diameter can extend into the interior of the first airway S; and then its sidewall can better contact the first airway S; thereby ensuring the airtightness of the sealing of the first airway S.

[0068] Furthermore, the sealing block 107 includes a movable groove 107a and a snap-fit ​​groove 107b; a sealing gasket 105b is provided on the outer side of the connection between the sealing end 105a and the push rod 105; the sealing gasket 105b contacts the bottom of the movable groove 107a and can block the second air passage I.

[0069] Specifically, the sealing block 107 has a cylindrical structure and is interference-fitted with the handle; a movable groove 107a is provided at one end near the sealing end 105a, so that the sealing end 105a can move a certain distance inside the movable groove 107a, thereby ensuring that the sealing end 105a has a certain amount of room to move.

[0070] Furthermore, the pressing member 103 contacts the end of the push rod member 105 and pushes the sealing end 105a to seal the first air passage S; as the moving sealing gasket 105b of the push rod member 105 separates from the bottom surface W of the snap-fit ​​groove 107b, the second air passage I is now in a clear state.

[0071] It should be noted that during the process of pressing the pressing member 103 to push the push rod member 105 to move, while the end of the sealing end 105a closes the first air passage S, the sealing gasket 105b also moves away from the bottom surface of the movable groove 107a; thus, the second air passage I is connected to the movable groove 107a; thereby, the gas can be discharged.

[0072] Furthermore, the pressing member 103 includes a snap-fit ​​member 103a disposed on one side thereon; the end of the snap-fit ​​member 103a is embedded into the inside of the snap-fit ​​groove 107b, and the snap-fit ​​member 103a is limited by the snap-fit ​​groove 107b.

[0073] Specifically, the pressing member 103 and the snap-fit ​​member 103a can be cast in one piece, or connected by bolts or other detachable methods. The snap-fit ​​member 103a is preferably an elastic snap with a trapezoidal end and different inclination angles on the contact surfaces. This ensures that it is relatively easy to insert the end of the snap-fit ​​member 103a into the sealing block 107, but requires a large force to separate the snap-fit ​​member 103a from the sealing block 107. At the same time, the groove inside the sealing block 107 can limit the snap-fit ​​member 103a, ensuring that the pressing member 103 and the sealing block 107 are connected. This ensures that the pressing member 103 will not separate from the sealing block 107.

[0074] Furthermore, a guide 106 is installed on the end face of the unlocking component 101; the unlocking component 101 is limited by the guide 106, so that the unlocking component 101 can move in the vertical direction.

[0075] In this embodiment, the structure of the guide member 106 is adapted to the structure of the unlocking member 101; the guide member 106 can limit the unlocking member 101 in the left and right directions; thereby ensuring that the unlocking member 101 can move in the vertical direction.

[0076] Furthermore, the guide member 106 can be a columnar structure, and the bottom of the corresponding unlocking member 101 should be provided with a waist hole structure adapted to the guide member 106. During the movement of the unlocking member 101, it can move along the direction of the waist hole by being limited by the guide member 106. The guide member 106 can also be a slider structure, and the bottom of the corresponding unlocking member 101 should be provided with a sliding groove adapted to the slider. Thus, the direction of the unlocking member 101 moving vertically can be determined.

[0077] It should be noted that the guide 106 can be detachably connected to the grip during installation; preferably, it can be connected by bolts, which can better adapt to the assembly of the corresponding parts.

[0078] In this embodiment, a reset member 108 is sleeved on the outer wall of the contact end 102a; the rebound force of the reset member 108 can push the unlocking member 101 back to normal, so that the staff can operate it again.

[0079] The structure of the reset member 108 is the same as that of the elastic member 104, but the elastic coefficient of the reset member 108 is smaller than that of the elastic member 104. One end of the reset member 108 contacts the surface of the contact end 102a, and the surface of the contact end 102a limits the reset member 108, thereby ensuring that the reset member 108 can be sleeved on the outside of the linkage member 102. Under normal conditions, the reset member 108 pushes the linkage member 102 to move through elastic potential energy. During the movement, the linkage member 102 can push the unlocking member 101 to move, thereby achieving the purpose of resetting the unlocking member 101.

[0080] In this embodiment, when in use, first hold the handle with your hand, and after the external air source is turned on, gas is introduced into the air chamber. After inflation, use your fingertip to push the slider to move the unlocking member 101 along the specific trajectory of the guide member 106. As the unlocking member 101 moves, its end can contact the abutment end 102a. Subsequently, as the unlocking member 101 moves, the end of the linkage member 102 near the limiting end 102b gradually shifts away from the end face M of the pressing member 103. Then, in this state, push the pressing member 103 to move it towards the push rod member 105. Then, the end of the pressing member 103 squeezes the push rod member 105, so that the blocking end 105a contacts the end of the first air passage S, thereby blocking the first air passage S. Then, the sealing gasket 105b moves away from the bottom surface of the movable groove 107a, so that the second air passage I is unobstructed, allowing the high-pressure gas remaining inside the shell to be discharged through the second air passage I.

[0081] Example 3

[0082] Reference Figures 1-6 This is the third embodiment of the present invention, which further provides a connection to a needleless injector.

[0083] In this embodiment, the device includes a housing 201, a grip 202, a dosage adjustment assembly 203, a pneumatic assembly 204, and an injection assembly 205. The grip 202 includes an air chamber 202a, a limiting chamber 202b, and a sliding chamber 202c. The linkage member 102 passes through the limiting chamber 202b and extends to its outer side. The pressing member 103 slides along the inner wall of the sliding chamber 202c. The inner wall of the grip 202 provides an installation position for the unlocking pressing structure 100.

[0084] The outer shell 201 is a metal plate structure, and the angle between the handle 202 and the outer shell 201 is greater than 90 degrees; preferably 100 degrees; the included angle is an obtuse angle, which makes it easier to operate and hold the device, and brings a better experience to the operator.

[0085] The grip 202 includes an air chamber 202a formed therein, and an air tube is connected to the end of the air chamber 202a; high-pressure gas can enter the air chamber 202a through the air tube; furthermore, the outer wall of the grip 202 is provided with a recess, which can correspond to the unlocking pressing structure 100, ensuring that the unlocking pressing structure 100 can be located inside the grip 202.

[0086] The guide member 106 is connected to the handle 202 via a threaded portion at its end, and the end of the guide member 106 can limit the unlocking member 101 to ensure that the unlocking member 101 will not detach from the inside of the guide member 106. In order to further meet the assembly process, the unlocking member 101 can be divided into a sliding part and a protruding part. The sliding part is hollow inside and has a structure that cooperates with the guide member 106, so that it is easier to connect the sliding part and the guide member 106. The protruding part protrudes from the outer wall surface of the handle 202, which makes it easier for the operator to push the unlocking member 101 to move. The protruding part and the sliding part are fixed by a snap-fit ​​connection.

[0087] The unlocking member 101 and the pressing member 103 are separated in the moving chamber; and the linkage member 102 passes through the inside of the two grooves, with the contact end 102a contacting the end of the unlocking member 101 and the limiting end 102b contacting the end face M of the pressing member 103; and the sealing block 107 is fixed inside the handle 202 and the airtightness of the connection is ensured by the rubber gasket.

[0088] In this embodiment, the dosage adjustment component 203 includes a rotary plug 203a, a feed screw sleeve 203b, a connecting sleeve 203c, and a balance valve 203d. The rotary plug 203a is disposed in the middle of the feed screw sleeve 203b, the connecting sleeve 203c is disposed on the outer ring of the feed screw sleeve 203b, and the balance valve 203d is disposed between the pneumatic component 204 and the rotary plug 203a. The connecting sleeve 203c and the balance valve 203d are coaxially coupled.

[0089] It should be noted that the rotary plug 203a has a silencer at its end, which is located on the side of the rotary plug 203a. The groove in the middle of the feed sleeve 203b slides with the rotary plug 203a. An adjusting rod is connected to the end of the feed sleeve 203b. The adjusting rod passes through the connecting sleeve 203c and the balance valve 203d and abuts against the right end of the pneumatic assembly 204. A second spring is provided on the outside of the balance valve 203d. The second spring is coaxially engaged with the balance valve 203d.

[0090] Furthermore, the pneumatic assembly 204 includes a piston 204a and a strike rod 204b. The piston 204a is disposed on the side of the strike rod 204b, and the connecting sleeve 203c is disposed on the other side of the strike rod 204b. A first spring 204a-1 is disposed at the end of the piston 204a, and the piston 204a slides inside the sleeve disposed inside the housing 201.

[0091] It should be noted that the piston 204a includes a first spring 204a-1 and a top cone. The first spring 204a-1 is coaxially engaged with the piston 204a. The top cone is located on the side of the piston 204a. The impact rod 204b includes a top plate and a fitting sleeve. The top plate is located on the side of the impact rod 204b and contacts the end of the adjusting rod. The fitting sleeve is located inside the impact rod 204b and engages with the end of the piston 204a.

[0092] In this embodiment, the connecting sleeve 203c divides the right side and left side of the outer shell 201 and forms a sealed first chamber on the right side; the connecting sleeve 203c has an air hole on its side wall, and the connecting sleeve 203c and the balance valve 203d form a second chamber, and the first chamber and the second chamber are connected by the air hole.

[0093] In this embodiment, the movable groove 107a and the sliding cavity 202c form an air chamber O. A balance air passage 202a-1 is provided between the air chamber O and the first chamber, and the air chamber O and the first chamber are connected through the balance air passage 202a-1. The air chamber 202a is connected to the third chamber at the left end of the outer shell 201 through the push air passage 202a-2.

[0094] Furthermore, the left end of the balance valve 203d can contact the end of the piston 204a, and a rubber sealing gasket is provided at the contact position between the two.

[0095] Furthermore, during the spiral feeding process, the left end of the feed sleeve 203b contacts the right end of the piston 204a; as the feed sleeve 203b extends through the balance valve 203d, the gap between the piston 204a and the balance valve 203d becomes larger; at the same time, the right end of the outer sleeve of the pneumatic assembly 204 abuts against the balance valve 203d; thus, a fourth chamber can be formed between the piston 204a and the balance valve 203d.

[0096] It should be noted that after the gas chamber 202a is filled with gas, the high-pressure gas is divided into two groups and enters the second chamber and the third chamber respectively. One group of gas enters the first chamber through the first air passage S and the balance air passage 202a-1, and then enters the third chamber through the air hole on the side wall of the balance valve 203d. The other group of gas enters the third chamber by pushing the air passage 202a-2. At this time, the gas pressure on both sides of the balance valve 203d is in a balanced state.

[0097] After the pressing element 103 is activated, driving the push rod 105 to block the first air passage S, the second air passage I is now open and connected to the outside. At this time, the high-pressure gas inside the second chamber flows through the balancing air passage 202a-1 into the air chamber O, and then is discharged into the air through the second air passage I. Since the first air passage S is blocked, the high-pressure gas can only enter the third chamber by pushing the air passage 202a-2. With the discharge of high-pressure gas from the second chamber, the air pressure inside the second chamber equals the pressure of the surrounding air. The air pressure gradually equalizes; however, the left end of the balance valve 203d is squeezed by the high-pressure gas, causing the balance valve 203d to move closer to the sealing gasket 203c-1; when the right end of the balance valve 203d comes into contact with the sealing gasket 203c-1, the internal passage of the exhaust channel 203d-1 is blocked, and the balance valve 203d is limited by the connecting sleeve 203c; at this time, the high-pressure gas can only squeeze the piston 204a, causing the piston 204a to slide along the inner wall of the sleeve towards the injection assembly 205.

[0098] After the blockage of the first air passage S is released, the high-pressure gas enters the second and third chambers in two groups as described above. After entering the second chamber, the high-pressure gas pushes the balance valve 203d to move closer to the pneumatic assembly 204. This causes the balance valve 203d to no longer contact the sealing gasket 203c-1. In this state, the gap between the feed sleeve 203b and the connecting sleeve 203c forms a passage with the exhaust channel 203d-1, allowing the high-pressure gas located between the piston 204a and the balance valve 203d to be discharged through the ear-shaped silencer at the tail of the dosage adjustment assembly 203.

[0099] Furthermore, the injection assembly 205 includes a connecting tube 205a, an injection chamber 205b disposed inside the connecting tube 205a, a liquid storage tube 205c disposed on the side wall of the connecting tube 205a, and an injection head 205d disposed at the end of the connecting tube 205a; the connecting tube 205a is connected to the outer shell 201, and the end of the impact rod 204b passes through the connecting tube 205a and extends into its interior.

[0100] It should be noted that the connecting tube 205a is inserted into the housing 201 and connected by threads. The limiting ring at the end of the connecting tube 205a contacts the connecting sleeve at the end of the housing 201, so that the injection assembly 205 is threadedly connected to the housing 201.

[0101] A branch tube is provided on the side of the injection chamber 205b, and a liquid storage tube 205c is located on the upper side of the branch tube. The liquid storage tube 205c includes a mounting ring, a locking ring, and a bracket. The end of the locking ring is provided with a sealing ball and a conical groove. The sealing ball and the conical groove are located inside the branch tube. The injection head 205d includes a protective cap, a connecting block, a needle tube, and a one-way rubber stopper. The protective cap is located at the end of the injection head, the connecting block is located on the side of the protective cap, the needle tube is located on the side of the liquid storage tube 205c, and the one-way rubber stopper is located at the other end of the needle tube.

[0102] The connector and pusher block are integrated into one structure. The connector engages with the top cone. When the top cone returns to its original position, it pulls the pusher block backward, creating a negative pressure effect in the injection chamber. This causes the sealing bulb to compress the spring it engages with, allowing the medication to flow out of the support and fill the injection chamber 205b. At this time, the one-way rubber stopper of the injection head 205d is subjected to negative pressure, causing the outer wall of the one-way rubber stopper to open, forming a seal at the injection head end. Before pushing the injection, the protective cap and support need to be removed from the device. Then, the syringe filled with medication is installed in the position where the support is installed. Then, pushing the injection causes the strike rod 204b to move the pusher block, squeezing the medication in the injection chamber 205b through the one-way rubber stopper and into the syringe.

[0103] It should be noted that the left end of the impact rod 204b extends into the interior of the connecting tube 205a. The amount by which the piston 204a moves by the feed screw sleeve 203b can control the volume inside the injection chamber 205b, thereby achieving the purpose of adjusting and controlling the dosage of the injected drug.

[0104] In this embodiment, during use, first hold the handle 202 with your hand. After turning on the external air source, introduce gas into the handle 202. After inflation, remove the protective cap and bracket from the device. When compressed air enters the air chamber 202a through the air pipe, the pneumatic component 204 is in a spring-loaded state under the action of the spring. The gas enters the balance air passage 202a-1 through the first air passage S, and at the same time, the gas enters the push air passage 202a-2. At this time, the air pressure on both sides of the balance valve 203d is balanced. Figure 5As indicated by the black dashed arrow, under the spring force, the balance valve 203d forms a seal between the sealing ring and the cylinder, pushing the unlocking component 101 to unlock it. The upward movement of the linkage component 102 provides space for the pressing component 103 to be activated. Pressing the pressing component 103 causes the push rod component 105 to move inward, and the sealing end 105a forms a seal with the sealing gasket. At this time, the gas in the balance air passage 202a-1 is connected to the atmosphere through the gap between the sealing end 105a and the sleeve. At this time, a pressure difference is formed on the left and right sides of the balance valve 203d. The pressure difference causes the balance valve 203d to move against the spring force towards the dosage adjustment component 203. After moving, the balance valve 203d seals with the sealing structure. At this time, compressed gas enters the gap between the balance valve 203d and the inner wall of the gun body, and the pressure acts on the end face of the piston 204a, causing the piston 204a to move under force. The piston pushes the strike rod 204b to move, which in turn pushes the liquid injector to form an injection. When the press button 103 is released, the trigger press button 103 resets under the action of the spring, the sealing end 105a moves to the left, and the compressed air enters the balance air passage 202a-1 through the first air passage S on the side wall of the air chamber O. At this time, the pressure difference between the left and right sides of the balance valve 203d disappears, and the balance valve 203d resets under the action of the spring. The sealing gasket seals with the cylinder. The compressed gas remaining in the cylinder is connected to the atmosphere through the exhaust passage 203d-1 and the muffler plug. The piston 204a and the strike rod 204b move to the right under the action of the spring, realizing the reset after injection. When the unlocking slider is released, the slider moves down, the limit pin moves down, and the limit pin locks the trigger to ensure that the trigger is not accidentally triggered. At this time, under the action of air pressure, the air pressure on both sides of the piston is equal, and the syringe is reset under the action of the spring.

[0105] Importantly, the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An unlocking press structure (100), characterized in that: Including unlocking component (101) and linkage component (102), The unlocking component (101) abuts against the linkage component (102), and the unlocking component (101) can drive the linkage component (102) to move when it moves; The linkage (102) includes an abutting end (102a) and a limiting end (102b), the limiting end (102b) being able to contact the end face (M) of the pressing member (103); and, The pressing member (103) is linked with the push rod member (105) through the elastic member (104), thereby realizing the blocking and release of the first air passage (S) by the push rod member (105).

2. The unlocking press structure as described in claim 1, characterized in that: A sealing block (107) is sleeved on the outside of the push rod (105); The sealing block (107) has a second air passage (I) inside, and the push rod (105) passes through the second air passage (I) and extends to its outer side; The push rod (105) moves along the axis of the second air passage (I); The elastic element (104) is sleeved on the outer wall of the push rod (105).

3. The unlocking press structure as described in claim 2, characterized in that: The push rod (105) includes a sealing end (105a) disposed at its end; The sidewall of the sealing end (105a) has a curved structure, thereby increasing the contact area between the sealing end (105a) and the end opening of the first airway (S).

4. The unlocking press structure as described in claim 3, characterized in that: The sealing block (107) includes movable grooves (107a) and snap-fit ​​grooves (107b) at both ends thereof; A sealing gasket (105b) surrounds the connection between the push rod (105) and the sealing end (105a); The sealing gasket (105b) is located inside the movable groove (107a) and can block the second air passage (I).

5. The unlocking press structure as described in claim 4, characterized in that: The pressing member (103) abuts against the end of the push rod member (105) to push the sealing end (105a) to seal the first air passage (S); The sealing gasket (105b) is separated from the bottom surface (W) of the snap-fit ​​groove (107b), and the second air passage (I) is unobstructed.

6. The unlocking press structure as described in claim 4 or 5, characterized in that: The pressing member (103) includes a snap-fit ​​member (103a) disposed on one side thereon; The end of the snap-fit ​​member (103a) is embedded inside the snap-fit ​​groove (107b), and the snap-fit ​​member (103a) is limited by the snap-fit ​​groove (107b).

7. The unlocking press structure as described in any one of claims 1, 2, 4 or 5, characterized in that: The unlocking component (101) has a guide component (106) on its end face; The guide (106) limits the unlocking member (101), thereby enabling the unlocking member (101) to move in the vertical direction.

8. The unlocking press structure as described in claim 7, characterized in that: The linkage (102) moves along the constraint trajectory of the guide (106), thereby achieving the separation of the limiting end (102b) from the end face (M) of the pressing member (103).

9. The unlocking press structure as described in any one of claims 1, 2, 5 or 8, characterized in that: The outer wall of the contact end (102a) is fitted with a reset member (108); The unlocking component (101) is restored to normal use status by the reset component (108).

10. A device for connecting a needle-free injector (200), characterized in that: Including the unlocking press structure as described in any one of claims 1 to 9; and, The outer casing (201) and the handle (202) disposed at the bottom of the side wall of the outer casing (201); The dose adjustment component (203) is linked with the pneumatic component (204). The extension length of the rotary plug (203a) provided at the end of the dose adjustment component (203) is adjustable, thereby realizing the control of the drug injection volume. The pneumatic component (204) works in conjunction with the dosage adjustment component (203) to inject the drug solution; The end of the outer shell (201) is detachably mounted with an injection assembly (205), and the impact rod (204b) provided at the end of the pneumatic assembly (204) penetrates the inside of the injection assembly (205); The grip (202) includes an air chamber (202a), a limiting chamber (202b), and a sliding chamber (202c); The linkage (102) passes through the limiting cavity (202b) and extends to its outer side; the pressing member (103) slides along the inner wall of the sliding cavity (202c).

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