CN114796721B

CN114796721B - Injection syringe

Info

Publication number: CN114796721B
Application number: CN202210329059.XA
Authority: CN
Inventors: 侯士双; 陈常娇; 袁霞林
Original assignee: Ningbo Ruiai Product Design Co ltd
Current assignee: Ningbo Ruiai Product Design Co ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2023-10-13
Anticipated expiration: 2042-03-30
Also published as: CN114796721A

Abstract

The application relates to an injector, which comprises a tube body and a medicine bottle, wherein a piston capable of moving up and down is arranged in the medicine bottle; a piston rod, the lower end of which is inserted into the medicine bottle and is positioned above the piston; the bracket is in a cylinder shape with an open top, can be used for placing the medicine bottle and can drive the medicine bottle to move upwards, so that the piston is propped against the lower end of the piston rod; the fixing piece is arranged at the lower part of the pipe body, the fixing piece is of a hollow tubular structure, the upper part of the bracket is sleeved with the fixing piece, and the fixing piece is fixedly connected with the bracket under the state that the piston abuts against the piston rod. The bracket for supporting the medicine bottle is arranged, so that when the medicine bottle is exhausted, the bracket drives the medicine bottle to move upwards until the gap between the piston and the piston rod is eliminated, and the exhaust is realized; therefore, the exhaust process of the application is characterized in that the medicine bottle moves upwards, the piston rod is not moved, and the exhaust process is distinguished from the downward movement of the piston rod during injection, so that misunderstanding of injection is not caused to a user, and the use requirement can be met.

Description

Injection syringe

Technical Field

The application relates to the technical field of medical appliances, in particular to an injector.

Background

A multi-shot syringe is a medicine injection device capable of dividing a medicine liquid in a medicine bottle into a plurality of shots to be injected into a user. The injector with multiple injections can be used for multiple times, so that the requirement of a patient is met. For example, diabetics typically require long-term insulin injections to control the condition, with small amounts per injection. If a small syringe is used each time, waste is caused. To avoid waste and reduce the cost of use, a single large syringe may be used for multiple doses.

However, due to the problem of assembly accuracy and the need of reserving space for liquid medicine and preventing the liquid medicine from overflowing, an axial assembly gap exists between a piston rod and a piston in a medicine bottle, if the gap is not eliminated before injection, the multi-injection injector can cause that the medicine amount injected into a patient does not reach the standard when the injector is injected for the first time, and the treatment effect is affected. Venting is required to eliminate the axial gap between the piston rod and the piston prior to injection.

In order to solve the problems, the Chinese patent application No. CN202110561355.8 (publication No. CN 113384776A) discloses a multi-injection medicine injection device, which comprises a shell, a plunger rod axially slidably arranged on the shell, a driving spring arranged in the shell, and a locking sleeve circumferentially rotatably arranged in the shell and sleeved outside the plunger rod; the outer side of the plunger rod is provided with a plunger convex part; the drive spring drives the plunger rod to always have a trend of moving towards the injection direction; the locking sleeve is provided with a locking step structure for the plunger convex part to abut so as to restrain the plunger rod from moving towards the injection direction; after the locking sleeve rotates a designated angle towards the unlocking direction, the plunger convex part is separated from the locking step structure and forms an injection stroke with the next step surface of the locking step structure, and under the action of the driving spring, the plunger rod moves towards the injection direction until the plunger convex part is abutted with the next step surface of the locking step structure.

The exhaust process of this patent is as follows: the plunger rod (corresponding to the following piston rod) moves towards the front end direction under the action of the driving spring until the plunger convex part is supported by the second step surface, and the distance between the first step surface and the second step surface is 3mm, so that the plunger rod pushes the piston on the clip-type bottle (corresponding to the following medicine bottle) towards the front end direction by 3mm, and the assembly gap in the axial direction between the front end of the plunger rod and the piston of the clip-type bottle can be eliminated, thereby realizing the exhaust.

However, the operation of the injection device for exhausting air is similar to the operation of injection, namely, the plunger rod moves forwards, so that misunderstanding of the first injection is easily caused to a user, namely, the user can mistreat the action of exhausting air for the first time as the injection action to directly perform injection, because the exhaust air dosage is generally far smaller than the injection dosage, serious dosage shortage risks are possibly caused, and the treatment effect is influenced.

Disclosure of Invention

The application aims to solve the technical problem of providing an injector capable of obviously distinguishing the exhaust action from the injection action so as to effectively prevent a user from mistaking the exhaust action for the injection action.

The technical scheme adopted for solving the technical problems is as follows: an injector, which is characterized in that,

comprises a pipe body

The top of the medicine bottle is open, and a piston capable of moving up and down is arranged in the medicine bottle;

the piston rod is arranged in the tube body, and the lower end of the piston rod is inserted into the medicine bottle and is positioned above the piston;

further comprises:

the bracket is in a cylinder shape with an open top, can be used for placing the medicine bottle and can drive the medicine bottle to move upwards, so that the piston is propped against the lower end of the piston rod;

the fixing piece is arranged at the lower part of the pipe body, the fixing piece is of a hollow tubular structure, the upper part of the bracket is sleeved with the fixing piece, and the fixing piece is fixedly connected with the bracket under the state that the piston abuts against the piston rod.

In order to connect the fixing element to the bracket, one of the solutions is: the fixing piece is connected with the upper part of the bracket in a threaded manner. The threaded connection is simple in structure and does not affect the movement of the bracket.

In order to prevent the bracket from moving upwards caused by the mistaken rotation of the bracket by a user, the lower end of the fixing piece is inserted into the bracket, the outer diameter of the pipe body is larger than that of the fixing piece, a protective sleeve is sleeved on the lower part of the pipe body and the upper part of the bracket and can move up and down relative to the pipe body and the bracket, but a connecting structure for enabling the pipe body and the bracket to synchronously rotate is arranged between the protective sleeve and the upper part of the bracket, a positioning structure for preventing the protective sleeve from rotating relative to the pipe body is further arranged between the protective sleeve and the pipe body, and the restraint of the positioning structure on the protective sleeve can be relieved when the protective sleeve moves downwards. The protective sheath can prevent the mistake and rotate the bracket, if not move down the protective sheath, the protective sheath can't rotate under location structure's restriction, and is equipped with connection structure again between protective sheath and the bracket, under the circumstances that the protective sheath can not rotate, the bracket also can't rotate.

The connecting structure can have various structural forms, and simple structure, the connecting structure includes the first spout of vertical extension and the first slider of sliding in first spout all the time, and first spout is located on one of the outer peripheral wall of bracket and the interior perisporium of protective sheath, and first slider is located on the other of the outer peripheral wall of bracket and the interior perisporium of protective sheath. The connecting structure does not influence the up-and-down movement of the protective sleeve, but can realize synchronous rotation of the protective sleeve and the bracket.

The positioning structure can have various structural forms, and is simple in structure, and the positioning structure comprises a second sliding groove which extends vertically and a second sliding block which can move out of the second sliding groove along the second sliding groove, wherein the second sliding groove is arranged on one of the outer peripheral wall of the pipe body and the inner peripheral wall of the protective sleeve, and the second sliding block is arranged on the other of the outer peripheral wall of the pipe body and the inner peripheral wall of the protective sleeve. When the second sliding block is arranged in the second sliding groove, the protective sleeve and the pipe body are fixed in the circumferential direction, and the protective sleeve cannot rotate because the pipe body is fixedly arranged and cannot rotate; when the protective sleeve moves downwards to enable the second sliding block to move out of the second sliding groove, the protective sleeve can rotate.

Under the state that the protective sheath passes through location structure and body links to each other, in order to prevent that the protective sheath from moving down, the constraint of location structure is removed, offered the draw-in groove on the periphery wall of body, the longitudinal section of draw-in groove is the arc, be equipped with the elasticity bump on the inner periphery wall of protective sheath, under the state that the protective sheath passes through location structure and body links to each other, the elasticity bump card is established in the draw-in groove, the protective sheath can not move down, unless artificial application of force makes elasticity bump deformation break away from the draw-in groove on the protective sheath, the protective sheath can move down and remove location structure to its constraint.

In order to connect the fixing member to the bracket, another solution is: the fixed part is a fixed sleeve sleeved on the upper part of the bracket, a first connecting part is arranged on the bracket, a second connecting part is arranged on the fixed sleeve, and the first connecting part is connected with the second connecting part when the bracket moves to a state that the piston abuts against the bottom end of the piston rod.

The first connecting piece and the second connecting piece can have various structural forms, preferably, a first accommodating hole penetrating through the wall thickness of the bracket is formed in the upper portion of the bracket, the first accommodating hole is internally provided with the first connecting piece, the first connecting piece comprises a connecting arm extending along the axial direction of the bracket and a positioning block formed at the end part of the connecting arm, the wall surface of the positioning block, which faces the fixing sleeve, is at least partially a first inclined surface which inclines from top to bottom in the direction away from the center line of the bracket, the peripheral wall of the fixing sleeve is provided with a buckling hole, the positioning block can be buckled in the buckling hole, and the buckling hole is the second connecting piece. The bracket moves upwards, and when the piston abuts against the bottom end of the piston rod, the positioning block is buckled in the buckling hole, so that the positioning of the bracket is realized.

Before the exhaust, the bracket needs to be positioned, a first flange is arranged on the inner peripheral wall of the fixing sleeve, a second flange positioned below the first connecting piece is arranged on the outer peripheral wall of the bracket, and the second flange can be placed on the first flange.

Before exhausting, the medicine bottle is required to be positioned vertically, a positioning tube connected with the tube body is inserted into the bracket, the bottom of the positioning tube is propped against the top of the medicine bottle, through holes of at least two hollowed positioning tube side walls are formed in the positioning tube at intervals along the axial direction of the positioning tube, each through hole extends along the circumferential direction of the positioning tube, and at least two through holes which are arranged at intervals along the axial direction are arranged in a staggered mode in the circumferential direction of the positioning tube, so that the positioning tube can be elastically deformed in the axial direction. The positioning tube limits the upward movement of the medicine bottle, the bracket can limit the downward movement of the medicine bottle, and the positioning tube can elastically deform, so that the upward movement of the medicine bottle is not influenced to exhaust.

Compared with the prior art, the application has the advantages that: the bracket for supporting the medicine bottle is arranged, so that when the medicine bottle is exhausted, the bracket drives the medicine bottle to move upwards until the gap between the piston and the piston rod is eliminated, and the exhaust is realized; therefore, the exhaust process of the application is characterized in that the medicine bottle moves upwards, the piston rod is not moved, and the exhaust process is distinguished from the downward movement of the piston rod during injection, so that misunderstanding of injection is not caused to a user, and the use requirement can be met.

Drawings

FIG. 1 is a schematic diagram of the structure of embodiment 1 (before venting, in the non-injected state);

FIG. 2 is a cross-sectional view of FIG. 1 with the cap removed (semi-sectioned longitudinally from the locating block);

FIG. 3 is a cross-sectional view of FIG. 1 with the cap removed (half-cut longitudinally from the boss);

FIG. 4 is a partially exploded view of FIG. 1;

FIG. 5 is a schematic view of the injection rod of FIG. 4;

FIG. 6 is a schematic view of the spacing tube of FIG. 4;

fig. 7 is a schematic view of the guide tube of fig. 4 (a view after the tube body is peeled off);

FIG. 8 is a cross-sectional view of the body, stopper tube, guide tube of FIG. 4;

FIG. 9 is a schematic view of the partial structure of FIG. 1 after the tube body has been stripped off and the handle outer race has been removed;

FIG. 10 is a cross-sectional view of FIG. 1 (cross-sectional view from the second stop block);

FIG. 11 is a schematic view showing the cross-sectional view of the injection completed state with the guide block and the first stopper;

FIG. 12 is a cross-sectional view (half longitudinal cross-section from the positioning block after venting, in the injection completed state) of an embodiment of the present application;

FIG. 13 is a cross-sectional view (half-section in the longitudinal direction from the bump after the exhaustion, in the injection-completed state) of example 1 of the present application;

FIG. 14 is a cross-sectional view (half-section longitudinally from the positioning block after venting, in the un-injected state) of example 1 of the present application;

FIG. 15 is a partially exploded view of FIG. 14;

figure 16 is a schematic view of the protective sheath of figure 15;

FIG. 17 is a schematic diagram of the structure of embodiment 2 (before venting, in the non-injected state);

FIG. 18 is a cross-sectional view of FIG. 17;

FIG. 19 is a schematic view of the structure of the bracket of FIG. 18;

FIG. 20 is a schematic view of the retaining sleeve of FIG. 18;

fig. 21 is a cross-sectional view (after venting, in an uninjected state) of example 2 of the present application.

Detailed Description

The application is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1 to 16, the syringe of the present preferred embodiment comprises a tube body 0, a vial 1, a piston rod 2, an injection rod 3, a guide tube 4, a positioning tube 5, a stopper tube 6 and a bracket 7. Define the injection direction of the injector as top down.

As shown in fig. 1 and 2, the top of the bracket 7 is open, the outside of the bracket 7 is detachably sleeved with a cap 70, the cap 70 is pulled out each time the syringe is used, and the cap 70 is sleeved after the injection is completed.

The medicine bottle 1 is placed in the bracket 7 from top to bottom, the top of the medicine bottle 1 is also open, a piston 11 capable of moving up and down is arranged in the medicine bottle 1, the piston rod 2 is arranged in the pipe body 0, the lower end of the piston rod 2 is inserted into the medicine bottle and is positioned above the piston 11, and the piston rod 2 moves downwards to push the piston 11 so as to inject the medicine liquid in the medicine bottle 1.

As shown in fig. 2 to 4, a plurality of positioning grooves 21 and a plurality of connecting grooves 22 are provided on the outer peripheral wall of the piston rod 2, the plurality of positioning grooves 21 are provided at intervals along the axial direction of the piston rod 2, and two adjacent positioning grooves 21 are communicated through one connecting groove 22. In this embodiment, two axially adjacent positioning grooves 21 are arranged in a staggered manner in the circumferential direction of the piston rod 2, the connecting groove 22 extends in the axial direction and the circumferential direction of the piston rod 2, and each positioning groove 21 extends in the circumferential direction of the piston rod 2.

The injection rod 3 is arranged in the tube body 0, the injection rod 3 is arranged above the medicine bottle 1 and sleeved on the piston rod 2, the injection rod 3 can rotate circumferentially relative to the piston rod 2 and can move upwards relative to the piston rod 2, a positioning block 31 is arranged on the inner peripheral wall of the injection rod 3, the positioning block 31 can sequentially slide into each positioning groove 21 from bottom to top along the connecting groove 22, the top and the bottom of each positioning groove 21 are closed, and the positioning block 31 can only be limited in the positioning groove 21 vertically. When the positioning block 31 is positioned in the positioning groove 21, the injection rod 3 can drive the piston rod 2 to move downwards so as to realize injection of liquid medicine; the positioning blocks 31 are sequentially limited in the positioning grooves 21, so that the injection rod 3 can sequentially drive the piston rod 2 to move downwards, and multiple quantitative injections of the liquid medicine are realized.

The number of the positioning grooves 21 through which the injection rod 3 rotates by one turn (360 DEG) is N, N is more than or equal to 2, and the angle at which the injection rod 3 needs to rotate before each injection is 360 DEG/N. In the embodiment, N is 2, and the injection rod 3 rotates 180 degrees each time, so that one dose injection is realized; moreover, because the two axially adjacent positioning grooves 21 are arranged in a staggered manner in the circumferential direction of the piston rod 2, the injection rod 3 always rotates in one direction (clockwise or anticlockwise), so that the positioning blocks 31 are sequentially limited in the positioning grooves 21, the rotation direction of the injection rod 3 does not need to be continuously changed, and the use of a user is facilitated. A handle 30 exposed to the tube body 0 is fixedly provided at the upper end of the injection rod 3 so as to facilitate the rotation of the injection rod 3.

As shown in fig. 7, 8 and 9, the guide tube 4 serves to guide the moving track of the injection rod 3, so that the positioning block 31 is accurately moved into the corresponding positioning groove 21. The injection rod 3 movably penetrates through the guide tube 4, N guide surfaces 41 are sequentially connected end to end along the circumferential direction are arranged on the guide tube 4, in this embodiment, the N guide surfaces 41 are arranged on the end surface of the guide tube 4 and sequentially connected end to end, specifically, each guide surface 41 comprises a first transverse section 411 and a second transverse section 412 which are arranged at intervals along the axial direction of the guide tube 4, the axial intervals are achieved by arranging a concave portion 410 extending along the circumferential direction on the end surface of the guide tube 4, that is, the first transverse section 411 is located at the bottom surface of the concave portion 410, the second transverse section 412 is located at the top surface of the concave portion 410 (that is, on the end surface of the guide tube 4), so that the first transverse section 411 is located below the second transverse section 412, and the first transverse section 411 and the second transverse section 412 are arranged in a staggered manner in the circumferential direction of the guide tube 4, and meanwhile, the end of the first transverse section 411 and the end of the second transverse section 412 are connected through the initial end of the first transverse section 411 and the second transverse section 412, and the distance between the initial end of the first transverse section 411 and the second transverse section 412 is equal to the axial direction of the second transverse section 412 and the adjacent to the first transverse section 21 and the second transverse section 412 is located on the axial direction of the same distance between the two adjacent axial sections on the axial direction of the piston rod 2.

And also requires: the first transverse sections 411 of two adjacent guide surfaces 41 are located on the same circumference, the first transverse sections 411 and the second transverse sections 412 of the adjacent guide surfaces 41 are connected through the vertical sections 42 extending along the axial direction of the guide tube 4, and the outer peripheral wall of the injection rod 3 is provided with the guide blocks 33 capable of sliding along the guide surfaces 41.

As shown in fig. 9, when the guide block 33 slides over the end of the second transverse section 412 and faces the start end of the first transverse section 411 of the adjacent guide surface 41, if the injection rod 3 continues to rotate, the positioning block 31 slides out of the second positioning slot 21, and once the second positioning slot 21 releases its vertical limit on the positioning block 31, the piston rod 2 cannot drive the injection rod 3 to move downward, so that the injection rod 3 needs to be limited to continue to rotate.

Defining the rotation direction of the injection rod 3 as a first direction, the injection rod 3 is further sleeved with a fixed limiting tube 6, the limiting tube 6 and the guide tube 4 are sequentially arranged along the axial direction of the injection rod 3, N first limiting blocks 61 are arranged on the limiting tube 6 along the circumferential direction at intervals, when the positioning block 31 slides across the tail end of the second transverse section 412 and faces the initial end of the first transverse section 411 of the adjacent guide surface 41, the first limiting blocks 61 are positioned on the moving path of the guide block 33 and are propped against the guide block 33 when the injection rod 3 rotates along the first direction, and thus the injection rod 3 cannot continue to rotate.

As shown in fig. 11, when the guide block 33 slides over the end of the second transverse section 412 and faces the start end of the first transverse section 411 of the adjacent guide surface 41, the guide block 33 can move down along the vertical section 42 to abut against the start end of the first transverse section 411 of the adjacent guide surface 41, so that the injection rod 3 drives the piston rod 2 to move down to complete the injection, after the injection is completed, the first limiting block 61 needs to release the limitation on the guide block 33 so that the injection rod 3 can continue to rotate for the next injection, so that when the guide block 33 moves down along the vertical section 42 to abut against the start end of the first transverse section 411 of the adjacent guide surface 41, the first limiting block 61 and the guide block 33 are staggered in the circumferential direction of the limiting tube 6, and the movement of the guide block along the first transverse section 411 is not hindered.

Also, when the guide block 33 slides over the end of the second transverse section 412 and faces the start end of the first transverse section 411 of the adjacent guide surface 41, not only the continued rotation of the injection rod 3 in the first direction needs to be limited, but also the reverse rotation thereof needs to be prevented, otherwise, the guide block 33 abuts against the second transverse section 412 on the original guide surface 41, which results in that the injection rod 3 cannot be moved down, and thus the piston rod 2 cannot be moved down for injection.

As shown in fig. 4, 5, 6, 9 and 10, the stopper tube 6 is provided with N first through holes 62 penetrating the wall thickness thereof at intervals along the circumferential direction thereof, each first through hole 62 is provided with a second stopper 63, the second stopper 63 comprises a first connecting arm 631 having one end connected to the side wall of the first through hole 62 and a second stopper 632 provided at the other end of the first connecting arm 631, the first connecting arm 631 extends along the circumferential direction of the stopper tube 6, and the first connecting arm 631 maintains a tendency to move radially inwardly (herein, in a direction toward the center line of the stopper tube 6) along the stopper tube 6 under the action of the first elastic member 633. In this embodiment, two second limiting members 63 are provided, the first elastic member 633 is an arc-shaped elastic sheet extending along the circumferential direction of the limiting tube 6, two ends of the elastic sheet are respectively coated on the outer surfaces of the two second limiting members 632, and two corresponding grooves 32 are also provided.

The outer peripheral wall of the injection rod 3 is provided with a groove 32 along the axial direction thereof, the cross section of the groove 32 is L-shaped, the second limiting block 632 can be abutted against the side wall of the groove 32, namely the blocking part 321, the side wall of the groove 32 is provided with the second limiting block 632 which is positioned on the moving path of the blocking part 321 when the injection rod 3 reversely rotates along the first direction under the state that the first limiting block 61 is abutted against the guide block 33, and the blocking part 321 is abutted against under the action of the first elastic piece 633, so that the aim of preventing the reverse rotation of the injection rod 3 is fulfilled.

The first connecting arm 631 is equivalent to an elastic arm, and when the injection rod 3 rotates in a first direction (clockwise in fig. 10), the first connecting arm 631 can move radially outwards (outwards refers to a direction far away from the central line of the limiting tube 6 here) after overcoming the acting force of the first elastic element 633, so that the rotation of the injection rod 3 is not interfered; when the injection rod 3 rotates to the position corresponding to the groove 32 and corresponds to a second limiting block 632, the first connecting arm 631 moves inwards along the radial direction of the limiting tube 6 under the action of the first elastic element 633, so that the second limiting block 632 is propped against the side wall of the groove 32 again, and the reverse rotation of the injection rod 3 is prevented.

In summary, when the guide block 33 slides over the end of the second transverse section 412 and faces the beginning of the first transverse section 411 of the adjacent guide surface 41, the injection rod 3 is blocked from rotating by the first limiting block 61 and the second limiting block 632, and the injection rod 3 can only move axially downwards, so that the guide block 33 moves downwards along the vertical section 42 to abut against the beginning of the first transverse section 411 of the adjacent guide surface 41, and one injection is completed.

As shown in fig. 3, 4, 8 and 11, the outer peripheral wall of the piston rod 2 is further provided with a limiting groove 23, the number of the limiting grooves 23 is not less than that of the positioning grooves 21, and the plurality of limiting grooves 23 are arranged at intervals along the axial direction of the piston rod 2. The positioning tube 5 is sleeved on the piston rod 2, a second through hole 51 penetrating through the wall thickness of the positioning tube 5 is formed in the positioning tube 5, a positioning piece 52 is arranged in the second through hole 51, the positioning piece 52 comprises an extension arm 521 with one end connected with the side wall of the second through hole 51 and a bump 522 arranged at the other end of the extension arm 521, the extension arm 521 extends along the axial direction of the positioning tube 5, the bump 522 can be buckled in the limit groove 23, the wall surface of the bump 522 facing the limit groove 23 is an inclined surface 5221 inclined towards the limit groove 23 from top to bottom (the inclined surface 5221 enables the thickness of the bump 522 to be gradually thickened from top to bottom). When the projection 522 is locked in the limit groove 23, the projection 522 can prevent the piston rod 2 from moving upwards, and when the injection is required, since the extension arm 521 is equivalent to an elastic arm, when the piston rod 2 moves downwards, the inclined surface 5221 on the projection 522 forces the extension arm 521 to move outwards along the radial direction of the piston rod 2 (the direction away from the central line of the piston rod 2 is outwards pointed here), so that the downward movement of the piston rod 2 is not limited, that is, the injection of the piston rod 2 is not influenced, until the projection 522 is locked in the next limit groove 23, and the upward movement of the piston rod 2 is prevented again.

Since the piston rod 2 is axially movable, all the positioning grooves 23 are substantially aligned in the axial direction of the piston rod 2, and a part of the positioning grooves 21 and the positioning grooves 23 are substantially aligned in the axial direction of the piston rod 2, and the part of the positioning grooves 21 also serve as the positioning grooves 23. Thus, the number of the limit grooves 23 can be reduced by using the two-purpose positioning grooves 21, and the positioning grooves 21 used as the limit grooves 23 and the limit grooves 23 are alternately arranged along the axial direction of the piston rod 2. This does not affect the locking operation of the positioning block 31 in the positioning groove 21.

The injection procedure of the syringe of this example was as follows:

as shown in fig. 2 and 3, in the initial state, the positioning block 31 is located in the lowermost positioning groove 21 (for convenience of description, the positioning groove 21 is defined as the first positioning groove 21), and the projection 522 is snapped into the lowermost limiting groove 23 (for convenience of description, the limiting groove 23 is defined as the first limiting groove 23);

rotating the handle 30, brings the injection rod 3 into rotation and the guide block 33 slides along one of the guide surfaces 41 (defined as the first guide surface 41): the guide block 33 slides along the first transverse section 411, the positioning block 31 moves along the circumferential direction of the first positioning groove 21, and the protruding block 522 is still buckled in the first limiting groove 23;

when the guide block 33 moves along the inclined section 413, the positioning block 31 moves in the circumferential direction and the axial direction of the connecting groove 22, and when the guide block 33 moves along the second lateral section 412, the positioning block 31 enters into the adjacent positioning groove 21 (defined as the second positioning groove 21) above the first positioning groove 21;

as shown in fig. 9 and 10, when the guide block 33 slides over the end of the second transverse section 412 and faces the start end of the first transverse section 411 of the adjacent guide surface 41, the guide block 33 abuts against the first limiting block 61 on the limiting tube 6, the second limiting block 632 on the limiting tube 6 abuts against the side wall of the groove 32 on the injection rod 3, the injection rod 3 cannot rotate and can only move axially, the guide block 33 moves along the vertical section 42, because the positioning block 31 is vertically limited in the second positioning groove 21, the injection rod 3 drives the piston rod 2 to move synchronously downwards at this time to perform one dose injection, and the protruding block 522 is also buckled in the adjacent limiting groove 23 (defined as the second limiting groove 23) above the first limiting groove 23;

at the completion of the injection, as shown in fig. 11, the guide block 33 is located at a first transverse section 411 of the guide surface 41 (defined as the second guide surface 41) adjacent to the first guide surface 41, and if the next injection is to be performed, the guide block 33 will slide along the second guide surface 41: the guide block 33 moves along the first transverse section 411, the positioning block 31 slides out of the second positioning groove 21, and when the guide block 33 is propped against the first transverse section 411, the vertical section 42 connected with the first guide surface 41 and the second guide surface 41 is positioned on the moving path of the guide block 33 when the injection rod 3 reversely rotates along the first direction, so that the injection rod 3 is prevented from reversely rotating;

the positioning block 31 moves in the circumferential direction and the axial direction of the connecting groove 22 when the guide block 33 moves along the inclined section 413, and the positioning block 31 enters the adjacent positioning groove 21 (defined as the third positioning groove 21) above the second positioning groove 21 when the guide block 33 moves along the second lateral section 412;

when the guide block 33 slides over the end of the second transverse section 412 and faces the beginning end of the first transverse section 411 of the adjacent guide surface 41, the guide block 33 abuts against the first limiting block 61 on the limiting tube 6, the second limiting block 632 on the limiting tube 6 abuts against the side wall of the groove 32 on the injection rod 3, the injection rod 3 cannot rotate and can only move axially, the guide block 33 moves along the vertical section, because the positioning block 31 is vertically limited in the third positioning groove 21, the injection rod 3 drives the piston rod 2 to move downwards synchronously, and then a dose is injected, and the protruding block 522 is also buckled in the adjacent limiting groove 23 (defined as the third limiting groove 23) above the second limiting groove 23;

repeating the above steps until the injection of all the liquid medicine is completed.

In this embodiment, the positioning tube 5 is integrally formed at the lower end of the tube body 0, the guiding tube 4 is formed in the tube body 0, the limiting tube 6 is disposed in the tube body 0 and located above the guiding tube 4, and the limiting tube 6 is fixedly connected with the tube body 0. The pipe body 0 is fixedly arranged, so the guide pipe 4, the positioning pipe 5 and the limiting pipe 6 are fixedly arranged.

Because of the problem of assembly accuracy and the need to reserve space for the liquid medicine and prevent the liquid medicine from overflowing, an axial assembly gap exists between the piston rod 2 and the piston 11, if the gap is not eliminated before injection, the medicine amount injected into a patient body by the injector in the first injection cannot reach the standard, so that before injection, air is exhausted, and the axial gap between the piston rod 2 and the piston 11 is eliminated.

As shown in fig. 14 to 16, in the present embodiment, the exhaust is achieved by the following structure:

the bracket 7 can drive the medicine bottle 1 to move upwards, so that the piston 11 is propped against the lower end of the piston rod 2, the axial gap between the piston 11 and the piston rod 2 is eliminated, and after the piston 11 is propped against the piston rod 2, the bracket 7 is moved upwards for a small distance, so that one drop of medicine liquid flows out, and the air in the medicine liquid is removed, namely, the air is exhausted. The fixing piece is arranged at the lower part of the pipe body 0, the fixing piece is of a hollow tubular structure, the upper part of the bracket 7 is sleeved with the fixing piece, the fixing piece is fixedly connected with the bracket 7 in a state that the piston 11 is propped against the piston rod 2, and in the embodiment, the fixing piece is in threaded connection with the upper part of the bracket 7, and the fixing piece is the positioning pipe 5.

The lower end of the positioning tube 5 is inserted into the bracket 7, and the positioning tube 5 is in threaded connection with the upper part of the bracket 7. It can be seen that the bracket 7 is moved upwards by rotating the bracket 7 to drive the medicine bottle 1 upwards for exhausting.

However, when the air discharge is not needed or the air discharge is completed, the user may rotate the bracket 7 by mistake, so that the medicine bottle 1 moves upwards and the medicine liquid flows out, and waste is caused, and according to the problem, the outer diameter of the pipe body 0 is larger than that of the positioning pipe 5, a protective sleeve 8 is sleeved on the lower part of the pipe body 0 and the upper part of the bracket 7, the protective sleeve 8 can move up and down relative to the pipe body 0 and the bracket 7, a connecting structure for enabling the protective sleeve 8 and the bracket 7 to synchronously rotate is arranged between the protective sleeve 8 and the upper part of the bracket 7, a positioning structure for preventing the protective sleeve 8 from rotating relative to the pipe body 0 is also arranged between the protective sleeve 8 and the pipe body 0, and the restraint of the positioning structure on the protective sleeve 8 can be relieved by the downward movement of the protective sleeve 8.

The protective sheath 8 can prevent the mistake and rotate bracket 7, if will not move protective sheath 8 downwardly, protective sheath 8 can't rotate under the restriction of location structure, and be equipped with connection structure between protective sheath 8 and the bracket 7 again, under the circumstances that protective sheath 8 can not rotate, bracket 7 also can't rotate.

In this embodiment, the connection structure includes a first sliding slot 81 extending vertically and a first sliding block 71 sliding in the first sliding slot 81 all the time, the first sliding slot 81 is provided on the inner peripheral wall of the protective sleeve 8, and the first sliding block 71 is provided on the outer peripheral wall of the bracket 7. Of course, the first slide groove 81 may be provided on the outer peripheral wall of the bracket 7, and the first slider 71 may be provided on the inner peripheral wall of the protective sheath 8.

The positioning structure comprises a second sliding groove 82 extending vertically and a second sliding block 01 capable of moving out of the second sliding groove 82 along the second sliding groove 82, the second sliding groove 82 is arranged on the inner peripheral wall of the protective sleeve 8, the second sliding block 01 is arranged on the outer peripheral wall of the pipe body 0, and of course, the second sliding groove 82 can also be arranged on the outer peripheral wall of the pipe body 0, and the second sliding block 01 is arranged on the inner peripheral wall of the protective sleeve 8.

When the second slide block 01 is in the second slide groove 82, the protective sleeve 8 and the pipe body 0 are fixed in the circumferential direction, and the protective sleeve 8 cannot rotate because the pipe body 0 is fixedly arranged and cannot rotate; when the protective sheath 8 moves down to move the second slider 01 out of the second chute 82, the protective sheath 8 can be rotated.

Under the state that protective sheath 8 links to each other with registration arm 5 through location structure, in order to prevent that protective sheath 8 from moving down, remove location structure's constraint, offered draw-in groove 02 on the periphery wall of registration arm 5, the longitudinal section of draw-in groove 02 is the arc (please see fig. 15), be equipped with elasticity bump 83 on the inner periphery wall of protective sheath 8, under the state that protective sheath 8 links to each other with registration arm 5 through location structure, elasticity bump 83 card is established in draw-in groove 02, protective sheath 8 can not drop down, unless the artificial application of force on protective sheath 8, make elasticity bump 83 warp and break away from draw-in groove 02, protective sheath 8 just can move down and remove location structure's constraint to it.

The exhaust process of this embodiment is as follows:

1. in the initial state, the elastic protruding points 83 are clamped in the clamping grooves 02, the first sliding block 71 is located in the first sliding groove 81, and the second sliding block 01 is located in the second sliding groove 82;

2. the protective sleeve 8 is pulled down to separate the elastic protruding points 83 from the clamping grooves 02, the second sliding block 01 moves out of the second sliding groove 82, then the protective sleeve 8 is rotated, the first sliding block 71 is located in the first sliding groove 81, so that the protective sleeve 8 drives the bracket 7 to rotate, the bracket 7 drives the medicine bottle 1 to move upwards until the lower end of the piston rod 2 abuts against the piston 11, the axial gap between the piston 11 and the piston rod 2 is eliminated, after the piston 11 abuts against the piston rod 2, the bracket 7 is moved upwards for a small distance to enable medicine liquid to flow out, air in the medicine liquid is removed, at the moment, the top of the medicine bottle 1 and the locating tube 5 are extruded to a limit state, and air exhaust is completed.

The lower extreme of registration arm 5 offsets with the top of medicine bottle 1, and the lateral wall of registration arm 5 is gone up and is equipped with the through-hole 53 of two at least fretwork lateral walls along its axial interval, and each through-hole 53 extends along the circumference of registration arm 5, and at least two among them fretwork hole 53 that set up at axial interval misplaces in the circumference of registration arm 5 to make registration arm 5 can elastic deformation in the axial. The positioning tube 5 restricts the upward movement of the medicine bottle 1, and the bracket 7 restricts the downward movement of the medicine bottle 1, and since the positioning tube 5 can be elastically deformed, the upward movement of the medicine bottle 1 is not affected to perform the air discharge.

Example 2

Embodiment 2 differs from embodiment 1 in the exhaust structure.

As shown in fig. 17 to 21, in this embodiment, the fixing member is a fixing sleeve 9 sleeved on the upper portion of the bracket 7, the bracket 7 is provided with a first connecting member 73, the fixing sleeve 9 is provided with a second connecting member, and the first connecting member 73 is connected with the second connecting member in a state that the bracket 7 moves until the piston 11 abuts against the bottom end of the piston rod 2.

In this embodiment, a first accommodating hole 72 penetrating through the wall thickness of the bracket 7 is formed at the upper portion of the bracket 7, the first connecting piece 73 is disposed in the first accommodating hole 72, the first connecting piece 73 includes a connecting strip 731 extending along the axial direction of the bracket 7 and a positioning portion 732 formed at the end portion of the connecting strip 731, a wall surface (i.e., an outer wall surface) of the positioning portion 732 facing the fixing sleeve 9 is at least partially an inclined surface portion 7321 inclined from top to bottom in a direction away from the center line of the bracket 7, a fastening hole 91 is formed on the peripheral wall of the fixing sleeve 9, the positioning portion 732 can be fastened in the fastening hole 91, and the fastening hole 91 is the second connecting piece. The bracket 7 moves upward, and when the piston 11 abuts against the bottom end of the piston rod 2, the positioning portion 732 is engaged with the engagement hole 91, thereby positioning the bracket 7.

The fixing sleeve 9 is provided with a first flange 92 on the inner peripheral wall and a second flange 74 below the first connector 73 on the outer peripheral wall of the bracket 7, the second flange 74 resting on the first flange 92 before venting to axially position the bracket 7.

The fixing sleeve 9 is provided with a guide groove 93 extending vertically, and the outer peripheral wall of the bracket 7 is provided with a convex part 75 capable of sliding along the guide groove 93 so as to guide the upward moving track of the bracket 7. In this embodiment, the fixing sleeve 9 is fixedly connected to the tube body 0.

The exhaust process of this embodiment is as follows:

1. in the initial state, as shown in fig. 18, the second flange 74 rests on the first flange 92, and the positioning portion 732 is located below the button hole 91;

2. the bracket 7 is pulled up and drives the medicine bottle 1 to move upwards, the convex part 75 slides along the guide groove 93 until the positioning part 732 is buckled in the buckling hole 91, at the moment, the lower end of the piston rod 2 is propped against the piston 11, the axial gap between the piston 11 and the piston rod 2 is eliminated, after the piston 11 is propped against the piston rod 2, the bracket 7 is moved upwards for a small distance, so that medicine liquid flows out by one drop, air in the medicine liquid is removed, at the moment, the top of the medicine bottle 1 and the positioning tube 5 are extruded to a limit state, and the air exhaust is completed.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for purposes of describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and because the disclosed embodiments of the present application may be arranged in different orientations, these directional terms are merely for illustration and should not be construed as limitations, such as "upper", "lower" are not necessarily limited to orientations opposite or coincident with the direction of gravity.

Claims

1. An injector comprises a tube body (0) and

the top of the medicine bottle (1) is open, and a piston (11) capable of moving up and down is arranged in the medicine bottle (1);

a piston rod (2) which is arranged in the tube body (0), and the lower end of the piston rod (2) is inserted into the medicine bottle (1) and is positioned above the piston (11);

characterized by further comprising:

the bracket (7) is in a cylindrical shape with an open top, can be used for placing the medicine bottle (1) and can drive the medicine bottle (1) to move upwards, so that the piston (11) is propped against the lower end of the piston rod (2);

the fixing piece is arranged at the lower part of the pipe body (0), is of a hollow tubular structure, is sleeved on the upper part of the bracket (7), and is fixedly connected with the bracket (7) in a state that the piston (11) is propped against the piston rod (2);

the fixing piece is in threaded connection with the upper part of the bracket (7), the lower end of the fixing piece is inserted into the bracket (7), the outer diameter of the pipe body (0) is larger than that of the fixing piece, a protective sleeve (8) is sleeved on the lower part of the pipe body (0) and the upper part of the bracket (7), the protective sleeve (8) can move up and down relative to the pipe body (0) and the bracket (7), a connecting structure which enables the protective sleeve (8) and the bracket (7) to synchronously rotate is arranged between the protective sleeve (8) and the upper part of the bracket (7), a positioning structure which prevents the protective sleeve (8) from rotating relative to the pipe body (0) is further arranged between the protective sleeve (8) and the pipe body, and the protective sleeve (8) can move down to release the restraint of the positioning structure on the protective sleeve (8);

or alternatively, the process may be performed,

the fixing piece is a fixing sleeve (9) sleeved on the upper portion of the bracket (7), a first connecting piece (73) is arranged on the bracket (7), a second connecting piece is arranged on the fixing sleeve (9), and the first connecting piece (73) is connected with the second connecting piece when the bracket (7) moves to a state that the piston (11) abuts against the bottom end of the piston rod (2); the bracket is characterized in that a first accommodating hole (72) penetrating through the wall thickness of the bracket is formed in the upper portion of the bracket (7), a first connecting piece (73) is arranged in the first accommodating hole (72), the first connecting piece (73) comprises a connecting strip (731) extending along the axial direction of the bracket (7) and a positioning part (732) formed at the end part of the connecting strip (731), at least part of the wall surface of the positioning part (732) facing the fixed sleeve (9) is an inclined surface part (7321) inclined towards the direction far away from the central line of the bracket (7) from top to bottom, a buckling hole (91) is formed in the peripheral wall of the fixed sleeve (9), and the positioning part (732) can be buckled in the buckling hole (91), namely the second connecting piece.

2. The syringe of claim 1, wherein: the connecting structure comprises a first sliding groove (81) extending vertically and a first sliding block (71) sliding in the first sliding groove (81) all the time, wherein the first sliding groove (81) is arranged on one of the outer peripheral wall of the bracket (7) and the inner peripheral wall of the protective sleeve (8), and the first sliding block (71) is arranged on the other of the outer peripheral wall of the bracket (7) and the inner peripheral wall of the protective sleeve (8).

3. The syringe of claim 1, wherein: the positioning structure comprises a second sliding groove (82) which extends vertically and a second sliding block (01) which can move out of the second sliding groove (82) along the second sliding groove (82), the second sliding groove (82) is arranged on one of the outer peripheral wall of the pipe body (0) and the inner peripheral wall of the protective sleeve (8), and the second sliding block (01) is arranged on the other of the outer peripheral wall of the pipe body (0) and the inner peripheral wall of the protective sleeve (8).

4. A syringe according to claim 3, wherein: the clamping groove (02) is formed in the outer peripheral wall of the pipe body (0), the longitudinal section of the clamping groove (02) is arc-shaped, the elastic protruding points (83) are arranged on the inner peripheral wall of the protective sleeve (8), and the elastic protruding points (83) are clamped in the clamping groove (02) when the protective sleeve (8) is connected with the pipe body (0) through the positioning structure.

5. The syringe of claim 1, wherein: the inner peripheral wall of the fixing sleeve (9) is provided with a first flange (92), the outer peripheral wall of the bracket (7) is provided with a second flange (74) positioned below the first connecting piece (73), and the second flange (74) can be placed on the first flange (92).

6. The syringe of any one of claims 1-5, wherein: the utility model discloses a medicine bottle, including bracket (7) and body, including support, body (0) and bracket (7), be equipped with in bracket (7) connect in locating tube (5) of body (0), the bottom of this locating tube (5) offsets with the top of medicine bottle (1), be equipped with through-hole (53) of two at least fretwork lateral walls along its axial interval on the lateral wall of locating tube (5), each through-hole (53) extend along the circumference of locating tube (5), and at least two wherein through-hole (53) that set up at axial interval dislocation set in the circumference of locating tube (5) to make locating tube (5) can elastic deformation in the axial.