CN114796721A

CN114796721A - Syringe

Info

Publication number: CN114796721A
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: 2022-07-29
Anticipated expiration: 2042-03-30
Also published as: CN114796721B

Abstract

The invention 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; the lower end of the piston rod is inserted into the medicine bottle and is positioned above the piston; the bracket is in a cylindrical shape with an open top, and can be used for placing the medicine bottle in and driving the medicine bottle to move upwards, so that the piston is abutted against the lower end of the piston rod; the fixing piece is arranged at the lower part of the pipe body and 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 in a state that the piston is abutted against the piston rod. The medicine bottle air exhaust device is provided with the bracket for supporting the medicine bottle, so that the bracket drives the medicine bottle to move upwards when exhausting air until a gap between the piston and the piston rod is eliminated, and the air exhaust is realized; therefore, the exhaust process of the injection device is that the medicine bottle moves upwards and the piston rod is not moved, and is different 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 further met.

Description

Syringe

Technical Field

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

Background

A multi-injection syringe is a medicine injection device which can inject medicine liquid in a medicine bottle into a user body for multiple times. The injector with multiple injections can be used for multiple times, so that the requirement of a patient is met. For example, a diabetic generally needs to inject insulin for a long time to control the disease condition, and the amount of insulin injected each time is small. If a small syringe is used each time, waste is caused. In order to avoid waste and reduce use cost, a large syringe can be used for injection in a quantitative manner.

However, in the injector capable of multiple injections in the market, due to the problem of assembly precision, the requirement of reserving space for liquid medicine and the prevention of overflow of the liquid medicine, an axial assembly gap exists between the piston rod and the piston in the medicine bottle, and if the gap is not eliminated before injection, the amount of the medicine injected into the body of a patient is not up to the standard when the injector capable of multiple injections is injected for the first time, so that 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 above problems, the invention discloses a medicine injection device for multiple injections in Chinese patent application with patent number CN202110561355.8 (publication number CN113384776A), which comprises a shell, a plunger rod axially slidably mounted on the shell, a drive spring mounted in the shell, and a locking sleeve circumferentially rotatably mounted 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 tendency to move towards the injection direction; the locking sleeve is provided with a locking stepped structure for the abutment of the plunger convex part to restrict the plunger rod to move towards the injection direction; after the locking sleeve rotates for a specified angle towards the unlocking direction, the plunger convex part is separated from the locking stepped structure and forms an injection stroke with the next-stage stepped surface of the locking stepped structure, and under the action of the driving spring, the plunger rod moves towards the injection direction until the plunger convex part is abutted against the next-stage stepped surface of the locking stepped structure.

The exhaust process of this patent is as follows: the plunger rod (equivalent to a piston rod below) moves towards the front end direction under the action of the drive 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 cartridge bottle (equivalent to a medicine bottle below) towards the front end direction by 3mm, and the axial assembly gap between the front end of the plunger rod and the piston of the cartridge bottle can be eliminated, so that air exhaust is realized.

However, the operation of venting the injection device is very similar to the operation of injecting, namely the plunger rod moves forward, which easily causes the misunderstanding that the first injection is performed, i.e. the user may misunderstand the first venting as the injection action to perform the injection directly, because the venting dose is generally much smaller than the injection dose, which may cause serious risk of dose insufficiency and affect the treatment effect.

Disclosure of Invention

The present invention is directed to provide an injector capable of distinguishing an exhaust action from an injection action, so as to effectively prevent a user from mistakenly considering the exhaust action as the injection action.

The technical scheme adopted by the invention for solving the technical problems is as follows: a syringe is characterized in that the syringe is provided with a syringe body,

comprises a pipe body and

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 in the medicine bottle and is positioned above the piston;

further comprising:

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

the fixing piece is arranged at the lower part of the pipe body and 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 in a state that the piston is abutted against the piston rod.

In order to connect the fixing piece with the bracket, one scheme is as follows: the fixing piece is in threaded connection with the upper part of the bracket. The screw connection is simple in structure and does not affect the movement of the bracket.

In order to prevent that the user from rotating the bracket by mistake and leading to the bracket to shift up, the lower extreme cartridge of mounting is in the bracket, the external diameter of body is greater than the mounting, a protective sheath cover is established on the lower part of body and the upper portion of bracket, and the protective sheath can reciprocate for body and bracket, but be equipped with between protective sheath and the bracket upper portion and make the two connection structure of synchronous pivoted, still be equipped with the location structure that prevents the relative body rotation of protective sheath between protective sheath and the body, the restraint of location structure to the protective sheath can be relieved in the protective sheath is shifted down to the protective sheath. The protective sheath can prevent to rotate the bracket by mistake, if not move the protective sheath down, the protective sheath can't rotate under location structure's restriction, and is equipped with connection structure again between protective sheath and the bracket, and under the protective sheath can't the pivoted condition, the bracket also can't rotate.

The connecting structure can have various structural forms, and is simple in structure, the connecting structure comprises a first sliding groove extending vertically and a first sliding block sliding in the first sliding groove all the time, the first sliding groove is arranged on one of the outer peripheral wall of the bracket and the inner peripheral wall of the protective sleeve, and the first sliding block is arranged on the other one of the outer peripheral wall of the bracket and the inner peripheral wall of the protective sleeve. This connection structure can not influence the reciprocating of protective sheath, but can realize the synchronous rotation of protective sheath and bracket again.

The positioning structure can have a plurality of structural forms, and is simple in structure, the positioning structure comprises a second sliding groove extending vertically and a second sliding block capable of moving to the outside of the second sliding groove along the second sliding groove, 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 one of the outer peripheral wall of the pipe body and the inner peripheral wall of the protective sleeve. When the second sliding block is in the second sliding groove, the protective sleeve and the pipe body are fixed in the circumferential direction, and the pipe body is fixedly arranged and cannot rotate, so that the protective sleeve 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 and links to each other, move down in order to prevent the protective sheath, remove location structure's restraint, seted up 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 internal perisporium of protective sheath, under the state that the protective sheath passes through location structure and body and 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 in the protective sheath, make the elasticity bump warp and break away from the draw-in groove, the protective sheath could move down and remove location structure to its restraint.

In order to connect the fixing piece with the bracket, another scheme is as follows: the fixing piece is a fixing sleeve sleeved on the upper portion of the bracket, a first connecting piece is arranged on the bracket, a second connecting piece is arranged on the fixing sleeve, and the first connecting piece and the second connecting piece are connected 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 portion of the connecting arm, the wall surface of the positioning block facing the fixing sleeve is at least partially a first inclined surface inclined from top to bottom in the direction far away from the central line of the bracket, a buckling hole is formed in the peripheral wall of the fixing sleeve, 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 exhausting, 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 the exhaust, need fix a position the medicine bottle on vertical, the registration arm that inserts in the bracket and link to the body, the bottom of this registration arm offsets with the top of medicine bottle, follows the through hole that its axial interval set up two at least fretwork registration arm lateral walls on the registration arm, and each through hole extends along the circumference of registration arm, and at least wherein two through holes that set up at the axial interval are in the setting of misplacing in the circumference of registration arm to make registration arm can elastic deformation in the axial. The registration arm limits shifting up of medicine bottle, and the bracket can limit shifting down of medicine bottle, because the registration arm can elastic deformation again, so can not influence the medicine bottle and move up and carry out the exhaust.

Compared with the prior art, the invention has the advantages that: the medicine bottle air exhaust device is provided with the bracket for supporting the medicine bottle, so that the bracket drives the medicine bottle to move upwards when exhausting air until a gap between the piston and the piston rod is eliminated, and the air exhaust is realized; therefore, the exhaust process of the injection device is that the medicine bottle moves upwards and the piston rod is not moved, and is different 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 further met.

Drawings

FIG. 1 is a schematic structural view (before purging, in a non-injection state) of example 1 of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1 with the cap removed (longitudinal half-section from the positioning block);

FIG. 3 is a cross-sectional view (in longitudinal half section from the projection) of FIG. 1 with the cap removed;

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 structural view of the stopper tube of FIG. 4;

FIG. 7 is a schematic view of the structure of the guide tube shown in FIG. 4 (with the tube body removed);

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

FIG. 9 is a partial schematic view of the handle of FIG. 1 with the tube and the outer ring of the handle peeled away;

FIG. 10 is a cross-sectional view of FIG. 1 (taken transversely from the second stopper);

FIG. 11 is a schematic view showing a cross-sectional view, a guide block and a first stopper in an injection completed state;

FIG. 12 is a cross-sectional view of an embodiment of the present invention (after venting, in the injection complete state, the self-positioning block is half cut longitudinally);

FIG. 13 is a sectional view showing a projection in the case of example 1 of the present invention (after exhausting, in a half-section in the longitudinal direction from the projection in the injection-completed state);

FIG. 14 is a sectional view of embodiment 1 of the present invention (after exhausting, in a non-injection state, a self-positioning block is longitudinally half-sectioned);

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

FIG. 16 is a schematic view of the protective sheath of FIG. 15;

FIG. 17 is a schematic structural view of example 2 of the present invention (before purging, in a non-injected state);

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

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

fig. 20 is a schematic view of the pouch of fig. 18;

fig. 21 is a sectional view (after exhausting, in a non-injection state) of embodiment 2 of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 16, the syringe of the preferred embodiment includes 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 holder 7. The injection direction of the injector is defined from top to bottom.

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

Medicine bottle 1 is shelved in bracket 7 from top to bottom, and medicine bottle 1 is also uncovered in the top, is equipped with the piston 11 that can reciprocate in the medicine bottle 1, and piston rod 2 installs in

body

0, and 2 lower extreme cartridges of piston rod are located piston 11 top in the medicine bottle, and piston rod 2 moves down and can promote piston 11 in order to carry out the injection of the liquid medicine 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 formed in the outer circumferential wall of the piston rod 2, the plurality of positioning grooves 21 are arranged at intervals along the axial direction of the piston rod 2, and two adjacent positioning grooves 21 are communicated with each other 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 installed in the pipe body 0, the injection rod 3 is located 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, and the top and the bottom of each positioning groove 21 are sealed, so that the positioning block 31 can only be limited in the positioning grooves 21 in the vertical direction. 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 the injection of the 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 times of quantitative injection of the liquid medicine is realized.

The number of the positioning grooves 21 through which the injection rod 3 rotates for one circle (360 degrees) is N, N is more than or equal to 2, and before each injection, the required rotation angle of the injection rod 3 is 360 degrees/N. In the embodiment, N is 2, the injection rod 3 rotates 180 degrees each time, and the injection of one dose is realized; and because two adjacent constant head tank 21 of axial of this embodiment are misplaced in the circumference of the piston rod 2, inject the pole 3 and rotate towards a direction all the time (clockwise or anticlockwise), so as to make the locating piece 31 limit in each constant head tank 21 sequentially, do not need to change the rotation direction of injecting the pole 3 continuously, facilitate users' use. A handle 30 exposed out of the tube body 0 is fixedly provided at the upper end of the injection rod 3 so as to rotate the injection rod 3.

As shown in fig. 7, 8 and 9, the guide tube 4 is used for guiding the moving track of the injection rod 3, so that the positioning block 31 can be accurately moved into the corresponding positioning slot 21. The injection rod 3 is movably arranged in the guide tube 4 in an end-to-end manner, N guide surfaces 41 are arranged on the guide tube 4 in an end-to-end manner, in this embodiment, N guide surfaces 41 are arranged on the end surface of the guide tube 4 and are connected end to end in sequence, specifically, each guide surface 41 comprises a first transverse section 411 and a second transverse section 412 which are arranged along the axial direction of the guide tube 4 at intervals, the axial interval is realized by arranging a recess 410 extending along the circumferential direction on the end surface of the guide tube 4, namely, the first transverse section 411 is arranged at the bottom surface of the recess 410, the second transverse section 412 is arranged at the top surface of the recess 410 (namely, on the end surface of the guide tube 4), so that the first transverse section 411 can be arranged below the second transverse section 412, the first transverse section 411 and the second transverse section 412 can be arranged in a staggered manner in the circumferential direction of the guide tube 4, and the smoothness of the first transverse section 411 and the second transverse section 412 of the same guide surface 41 is considered to be connected, the end of the first transverse section 411 and the beginning of the second transverse section 412 are connected by an inclined section 413, and the axial distance between the first transverse section 411 and the second transverse section 412 in the axial direction of the guide tube 4 is the same as the axial distance between two axially adjacent positioning slots 21 on the piston rod 2.

And further requires: the first transverse sections 411 of two adjacent guide surfaces 41 are located on the same circumference, the first transverse sections 411 are connected with the second transverse sections 412 of the adjacent guide surfaces 41 through the vertical section 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 block 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 beginning of the first transverse section 411 of the adjacent guide surface 41, if the injection rod 3 continues to rotate, the positioning block 31 will slide out of the second positioning groove 21, once the second positioning groove 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 from further rotating.

The rotation direction of the injection rod 3 is defined as a first direction, the injection rod 3 is further sleeved with a fixedly arranged limiting tube 6, the limiting tube 6 and the guide tube 4 are sequentially arranged along the axial direction of the injection rod 3, the limiting tube 6 is provided with N first limiting blocks 61 at intervals along the circumferential direction of the limiting tube, when the positioning block 31 slides over the tail end of the second transverse section 412 and faces the starting end of the first transverse section 411 of the adjacent guide surface 41, the first limiting blocks 61 are located on the moving path of the guide block 33 when the injection rod 3 rotates along the first direction and abut against the guide block 33, and therefore 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 beginning end of the first transverse section 411 of the adjacent guide surface 41, the guide block 33 can move downward along the vertical section 42 to abut against the beginning 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 downward to complete the injection, after the injection is completed, the first limit block 61 needs to release the limit on the guide block 33, so that the injection rod 3 can continue to rotate for the next injection, and therefore when the guide block 33 moves downward along the vertical section 42 to abut against the beginning end of the first transverse section 411 of the adjacent guide surface 41, the first limit block 61 and the guide block 33 are staggered in the circumferential direction of the limit pipe 6, and do not hinder the movement of the guide block along the first transverse section 411.

Furthermore, 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, it is necessary to not only limit the injection rod 3 from continuing to rotate in the first direction, but also prevent the injection rod from rotating in the opposite direction, otherwise the guide block 33 abuts against the second transverse section 412 of the original guide surface 41, which may cause the injection rod 3 to be unable to move downward, and further cause the piston rod 2 to be unable to move downward for injection.

As shown in fig. 4, 5, 6, 9 and 10, N first through holes 62 penetrating through the wall thickness of the limiting tube 6 are formed in the limiting tube 6 at intervals along the circumferential direction thereof, a second limiting member 63 is disposed in each first through hole 62, the second limiting member 63 includes a first connecting arm 631 having one end connected to the side wall of the first through hole 62 and a second limiting member 632 disposed at the other end of the first connecting arm 631, the first connecting arm 631 extends along the circumferential direction of the limiting tube 6, and the first connecting arm 631 tends to move radially inward (here, inward in the direction toward the center line of the limiting tube 6) along the limiting tube 6 under the action of the first elastic member 633. In this embodiment, there are two second limiting parts 63, the first elastic element 633 is an arc-shaped elastic sheet extending along the circumferential direction of the limiting pipe 6, two ends of the first elastic sheet are respectively wrapped on the outer surfaces of the two second limiting parts 632, and correspondingly, there are also two grooves 32 described below.

The 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 limit block 632 can abut against the side wall of the groove 32, the side wall of the groove 32 is the stop portion 321, and in the state that the first limit block 61 abuts against the guide block 33, the second limit block 632 is located on the moving path of the stop portion 321 when the injection rod 3 rotates in the reverse direction along the first direction and abuts against the stop portion 321 under the action of the first elastic member 633, so that the purpose of preventing the injection rod 3 from rotating in the reverse direction is achieved.

The first connecting arm 631 is equivalent to an elastic arm, and when the injection rod 3 rotates in a first direction (e.g. clockwise in fig. 10), the first connecting arm 631 can move radially outward (in a direction away from the centerline of the stopper tube 6) after overcoming the force of the first elastic member 633, and will not interfere with the rotation of the injection rod 3; when the injection rod 3 rotates to the groove 32 corresponding to a second stopper 632, the first connecting arm 631 moves radially inward along the stopper tube 6 under the action of the first elastic element 633, so that the second stopper 632 abuts against the sidewall of the groove 32 again, thereby preventing the injection rod 3 from rotating reversely.

In summary, 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 injection rod 3 is blocked by the first and second limiting

blocks

61 and 632 and cannot rotate, and the injection rod 3 can only move axially downward, so that the guide block 33 moves downward along the vertical section 42 to abut against the beginning end of the first transverse section 411 of the adjacent guide surface 41, thereby completing one injection.

As shown in fig. 3, 4, 8 and 11, the outer circumferential wall of the piston rod 2 is further provided with a plurality of limiting grooves 23, the number of the limiting grooves 23 is not less than the number 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 arranged on the positioning tube 5, a positioning member 52 is arranged in the second through hole 51, the positioning member 52 comprises an extension arm 521 and a projection 522, one end of the extension arm 521 is connected with the side wall of the second through hole 51, the projection 522 is 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 projection 522 can be buckled in the limiting groove 23, and the wall surface of the projection 522, facing the limiting groove 23, is an inclined surface 5221 which is inclined towards the limiting groove 23 from top to bottom (the inclined surface 5221 can enable the thickness of the projection 522 to be gradually thickened from top to bottom). When the protrusion 522 is fastened in the position-limiting groove 23, the protrusion 522 can prevent the piston rod 2 from moving upwards, and when 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 protrusion 522 forces the extension arm 521 to move outwards (here, outwards pointing away from the central line of the piston rod 2) along the radial direction of the piston rod 2, and does not limit the downward movement of the piston rod 2, i.e., does not affect the injection of the piston rod 2, until the protrusion 522 is fastened in the next position-limiting groove 23, and once again prevents the piston rod 2 from moving upwards.

Because the piston rod 2 is axially moved, all the position-limiting grooves 23 are substantially in a straight line along the axial direction of the piston rod 2, and a part of the positioning grooves 21 and the position-limiting grooves 23 are substantially in the same straight line along the axial direction of the piston rod 2, and the part of the positioning grooves 21 also serve as the position-limiting grooves 23. Thus, the positioning grooves 21 have two purposes, the number of the limiting grooves 23 can be reduced, and the positioning grooves 21 used as the limiting grooves 23 and the limiting grooves 23 are sequentially and alternately arranged along the axial direction of the piston rod 2. Thus, the buckling action of the positioning block 31 in the positioning groove 21 is not influenced.

The injection process of the syringe of this embodiment is 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 protrusion 522 is buckled in 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, causing the injection rod 3 to rotate, 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 projection 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 along the circumferential direction and the axial direction of the connecting groove 22, and when the guide block 33 moves along the second transverse section 412, the positioning block 31 enters 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 beginning of the first transverse section 411 of the adjacent guide surface 41, at this time, the guide block 33 abuts against the first stop block 61 on the stop tube 6, the second stop block 632 on the stop 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, at this time, the injection rod 3 drives the piston rod 2 to synchronously move downwards to inject a dose, and the protrusion 522 is also buckled in the adjacent limiting groove 23 (defined as the second limiting groove 23) above the first limiting groove 23;

when the injection is completed, as shown in fig. 11, the guide block 33 is located at the first transverse section 411 of the guide surface 41 (defined as the second guide surface 41) adjacent to the first guide surface 41, and the guide block 33 will slide along the second guide surface 41 if the next injection is to be performed: 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 abuts against the first transverse section 411, the vertical section 42 formed by connecting 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 rotates in the reverse direction along the first direction, so that the injection rod 3 is prevented from rotating in the reverse direction;

when the guide block 33 moves along the inclined section 413, the positioning block 31 moves along the circumferential direction and the axial direction of the connecting groove 22, and when the guide block 33 moves along the second transverse section 412, 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 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, at this time, the guide block 33 abuts against the first stop block 61 on the limit tube 6, the second stop block 632 on the limit 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, at this time, the injection rod 3 drives the piston rod 2 to synchronously move downwards, injection of a dose is performed again, and the protrusion 522 is also buckled in the adjacent limit groove 23 (defined as the third limit groove 23) above the second limit groove 23;

the above steps are repeated in this way until all the injections of the medical fluid are completed.

In this embodiment, 5 integrated into one piece of registration arm in the lower extreme of body 0, the shaping of stand pipe 4 is in body 0, and spacing pipe 6 is located body 0 and is located 4 tops of stand pipe, and fixed linking to each other between spacing pipe 6 and the body 0. The pipe body 0 is fixedly arranged, so that the guide pipe 4, the positioning pipe 5 and the limiting pipe 6 are fixedly arranged.

Because the problem of assembly precision and need reserve the space for the liquid medicine, prevent that the liquid medicine is excessive, can have axial assembly clearance between piston rod 2 and the piston 11, if do not eliminate this section clearance before the injection, can cause the syringe to inject the internal dose of patient not up to standard in the injection of first time, so before the injection, need exhaust, eliminate the axial clearance between piston rod 2 and the piston 11.

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

the bracket 7 can drive the medicine bottle 1 to move upwards, so that the piston 11 is abutted 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 abutted against the piston rod 2, the bracket 7 is moved upwards by a small distance to enable the medicine liquid to flow out one drop, air in the medicine liquid is removed, and then air is exhausted. The fixing member is disposed at the lower portion of the tube body 0, the fixing member is a hollow tubular structure, the upper portion of the bracket 7 is sleeved with the fixing member, and the fixing member is fixedly connected with the bracket 7 in a state that the piston 11 abuts against the piston rod 2.

The lower end of the positioning pipe 5 is inserted in the bracket 7, and the positioning pipe 5 is in threaded connection with the upper part of the bracket 7. Therefore, in the present embodiment, the bracket 7 is moved upward by rotating the bracket 7, so as to drive the medicine bottle 1 to move upward for air exhaust.

But when not needing to exhaust, or exhaust the completion, the user probably can mistake and rotate bracket 7, lead to medicine bottle 1 to shift up, the liquid medicine flows out, cause the waste, to this problem, the external diameter of body 0 is greater than

registration arm

5, 8 covers of a protective sheath are established on body 0 lower part and bracket 7 upper portion, protective sheath 8 can reciprocate for body 0 and bracket 7, and be equipped with between protective sheath 8 and the bracket 7 upper portion and make the synchronous pivoted connection structure of the two, still be equipped with between protective sheath 8 and the body 0 and prevent that protective sheath 8 is relative to the rotatory location structure of body 0, protective sheath 8 moves down and can remove the restraint of location structure to protective sheath 8.

Protective sheath 8 can prevent that the mistake from rotating bracket 7, if do not move protective sheath 8 down, protective sheath 8 can't rotate under location structure's restriction, and is equipped with connection structure again between protective sheath 8 and the bracket 7, and 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 groove 81 extending vertically and a first sliding block 71 sliding in the first sliding groove 81 all the time, the first sliding groove 81 is disposed on the inner peripheral wall of the protective sheath 8, and the first sliding block 71 is disposed 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 protector 8.

The positioning structure includes a vertically extending second chute 82 and a second slider 01 capable of moving along the second chute 82 to the outside of the second chute 82, the second chute 82 is disposed on the inner peripheral wall of the protection sleeve 8, the second slider 01 is disposed on the outer peripheral wall of the tube body 0, of course, the second chute 82 can also be disposed on the outer peripheral wall of the tube body 0, and the second slider 01 is disposed on the inner peripheral wall of the protection sleeve 8.

When the second sliding block 01 is in the second sliding groove 82, the protective sleeve 8 and the tube body 0 are fixed in the circumferential direction, and the protective sleeve 8 cannot rotate because the tube 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 sliding slot 82, the protective sheath 8 can rotate.

Protective sheath 8 passes through under the state that location structure and registration arm 5 link to each other, in order to prevent that protective sheath 8 from moving down, remove location structure's restraint, draw-in groove 02 has been seted up 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 protective sheath 8's the internal perisporium, under the state that protective sheath 8 passes through location structure and registration arm 5 to link to each other, elasticity bump 83 card is established in draw-in groove 02, protective sheath 8 can not drop downwards, unless artificial application of force is on protective sheath 8, make elasticity bump 83 warp and break away from draw-in groove 02, protective sheath 8 can only move down and remove location structure to its restraint.

The venting process of the present example is as follows:

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

2. pull down protective sheath 8, make elasticity bump 83 break away from draw-in groove 02, second slider 01 moves outside second spout 82, then rotate protective sheath 8, because first slider 71 is located first spout 81, so protective sheath 8 can drive bracket 7 and rotate, bracket 7 drives medicine bottle 1 and moves up, the lower extreme and piston 11 of piston rod 2 offset, eliminate the axial clearance between piston 11 and the piston rod 2, and after piston 11 offsets with piston rod 2, move bracket 7 a short segment distance upwards again, so that the liquid medicine flows out one drop, clear away the air in the liquid medicine, the top of medicine bottle 1 extrudees to the limit state with registration arm 5 this moment, exhaust is accomplished.

The lower extreme of registration arm 5 offsets with the top of medicine bottle 1, and along its axial interval be equipped with the through hole 53 of two at least fretwork lateral walls on the lateral wall of registration arm 5, each through hole 53 extends along the circumference of registration arm 5, and at least two of them are in the setting of misplacing in registration arm 5's circumference at the fretwork hole 53 that axial interval set up to make registration arm 5 can elastic deformation in the axial. The positioning tube 5 limits the upward movement of the medicine bottle 1, the bracket 7 can limit the downward movement of the medicine bottle 1, and the positioning tube 5 can elastically deform, so that the upward movement of the medicine bottle 1 is not influenced for exhausting.

Example 2

Embodiment 2 differs from embodiment 1 in the exhaust structure.

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

In this embodiment, the upper portion of the bracket 7 is provided with a first accommodating hole 72 penetrating through the wall thickness of the bracket 7, the first accommodating hole 72 is provided with the first connecting member 73, the first connecting member 73 includes a connecting bar 731 extending along the axial direction of the bracket 7 and a positioning portion 732 formed at the end of the connecting bar 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 provided 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 a second connecting member. The bracket 7 moves upward, and when the piston 11 abuts against the bottom end of the piston rod 2, the positioning part 732 is buckled in the buckling hole 91, so that the bracket 7 is positioned.

The inner peripheral wall of the sleeve 9 is provided with a first flange 92 and the outer peripheral wall of the bracket 7 is provided with a second flange 74 located below the first connector 73, 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 vertically extending guide groove 93, and the outer peripheral wall of the bracket 7 is provided with a convex portion 75 capable of sliding along the guide groove 93 to guide the upward movement track of the bracket 7. In this embodiment, the fixing sleeve 9 is fixedly connected to the pipe body 0.

The venting process of this example is as follows:

1. in an 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 buttonhole 91;

2. the bracket 7 is pulled upwards 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, the lower end of the piston rod 2 is abutted against the piston 11 at the moment, the axial gap between the piston 11 and the piston rod 2 is eliminated, and the bracket 7 is moved upwards for a short distance after the piston 11 is abutted against the piston rod 2, so that the medicine liquid flows out one drop, the air in the medicine liquid is removed, the top of the medicine bottle 1 and the positioning pipe 5 are extruded to a limit state at the moment, and the exhaust is completed.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to 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);

the piston rod (2) is installed 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);

it is characterized by also comprising:

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

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

2. The syringe of claim 1, wherein: the fixing piece is in threaded connection with the upper part of the bracket (7).

3. The syringe of claim 2, wherein: the lower extreme cartridge of mounting is in bracket (7), the external diameter of body (0) is greater than the mounting, and a protective sheath (8) cover is established on the lower part of body (0) and the upper portion of bracket (7), protective sheath (8) can reciprocate for body (0) and bracket (7), just be equipped with between protective sheath (8) and bracket (7) upper portion and make the synchronous pivoted connection structure of the two, still be equipped with between protective sheath (8) and the body and prevent that protective sheath (8) are rotatory location structure relative to body (0), protective sheath (8) move down and can remove the restraint of location structure to protective sheath (8).

4. The syringe of claim 3, 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, 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 one of the outer peripheral wall of the bracket (7) and the inner peripheral wall of the protective sleeve (8).

5. The syringe of claim 3, wherein: the positioning structure comprises a second sliding groove (82) extending vertically and a second sliding block (01) capable of moving to the outside 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 one of the outer peripheral wall of the pipe body (0) and the inner peripheral wall of the protective sleeve (8).

6. The syringe of claim 5, wherein: the utility model discloses a pipe joint, including body (0), draw-in groove (02), the longitudinal section of draw-in groove (02) has been seted up on the periphery wall of body (0), be the arc on the internal perisporium of protective sheath (8), be equipped with elasticity bump (83) on protective sheath (8) through location structure with body (0) continuous state under, elasticity bump (83) card is established in draw-in groove (02).

7. The syringe of claim 1, wherein: the mounting is established fixed cover (9) on bracket (7) upper portion for the cover, be equipped with first connecting piece (73) on bracket (7), be equipped with the second connecting piece on fixed cover (9) bracket (7) are removed under the state that the bottom of piston (11) and piston rod (2) offsets, first connecting piece (73) and second connecting piece link to each other.

8. The syringe of claim 7, wherein: the upper portion of the bracket (7) is provided with a first containing hole (72) penetrating through the wall thickness of the bracket, a first connecting piece (73) is arranged in the first containing hole (72), the first connecting piece (73) comprises 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), the 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 the direction away from the center line of the bracket (7), the peripheral wall of the fixing sleeve (9) is provided with a fastening hole (91), the positioning portion (732) can be fastened in the fastening hole (91), and the fastening hole (91) is the second connecting piece.

9. The syringe of claim 8, wherein: the inner peripheral wall of the fixed 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).

10. The syringe of any one of claims 1 to 9, wherein: the medicine bottle positioning device is characterized in that a positioning tube (5) connected to the tube body (0) is inserted into the bracket (7), the bottom of the positioning tube (5) is abutted to the top of the medicine bottle (1), through holes (53) with at least two hollowed-out side walls are formed in the side wall of the positioning tube (5) at intervals along the axial direction of the positioning tube, each through hole (53) extends along the circumferential direction of the positioning tube (5), and at least two through holes (53) arranged at intervals along the axial direction are arranged in a staggered mode in the circumferential direction of the positioning tube (5), so that the positioning tube (5) can elastically deform in the axial direction.