CN113440687A

CN113440687A - Implanting syringe

Info

Publication number: CN113440687A
Application number: CN202010211031.7A
Authority: CN
Inventors: 蒋刚锋; 苏日佳; 王燕清; 陈正乾; 张啸然; 梁慧君; 严珍; 谢石宝; 徐朋; 钱增婷
Original assignee: Livzon Pharmaceutical Group Inc
Current assignee: Livzon Pharmaceutical Group Inc
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2021-09-28

Abstract

The present invention relates to a device for delivering a formulation into subcutaneous tissue, and in particular to an implantation syringe. The implanting injector of the present invention comprises: the injection needle is fixedly connected with the front end of the outer sleeve, the preparation receiving part is fixedly arranged inside the outer sleeve, the outer sleeve is axially and slidably arranged outside the inner sleeve, the inner wall of the outer sleeve is provided with a radial clamping part extending inwards, and the radial clamping part is provided with a first position for limiting the outer sleeve to axially slide; the syringe push rod and the inner sleeve are arranged in an axial sliding manner, the piston is fixedly arranged in the syringe push rod, and the front end of the piston corresponds to the preparation accommodating cavity of the preparation receiving part; when the injector push rod slides axially towards the front end of the inner sleeve, the piston slides forwards along the preparation containing cavity, and when the injector push rod enters the inner part of the outer sleeve, the radial clamping part is acted by the outward acting force of the injector push rod and is separated from the first position to release the axial sliding limitation on the outer sleeve.

Description

Implanting syringe

Technical Field

The present invention relates to a device for delivering a formulation into subcutaneous tissue, and in particular to an implantation syringe.

Background

An implantation syringe is a device for delivering a preparation into subcutaneous tissues, and generally comprises an injection needle for penetrating into skin, wherein an accommodating cavity for accommodating the preparation is arranged in an outer sleeve connected with the injection needle, a push rod and a piston connected with the push rod are arranged in the outer sleeve, after the injection needle penetrates into the subcutaneous tissues, the push rod is pushed to push the preparation into the injection needle from the accommodating cavity in the outer sleeve, then the outer sleeve is pulled backwards to withdraw the injection needle from the tissues, and in the process of withdrawing the injection needle, the preparation is separated from the needle head of the injection needle under the pushing action of the piston and is retained in the subcutaneous tissues.

In the operation process of implanting the syringe, when the step of pushing the push rod to make the preparation enter the syringe needle is operated, the syringe needle must keep the original position, if the position of the syringe needle changes in the process of pushing the push rod, the preparation cannot reach the preset position, so an operator needs to avoid touching an outer sleeve connected with the syringe needle as far as possible in order to ensure that the position of the syringe needle does not change in the process of pushing the push rod, and the holding area of the implanted syringe is too narrow in the operation process, so that the operation is inconvenient.

Disclosure of Invention

Therefore, it is necessary to provide an implantation syringe which is convenient to hold and prevents misoperation in order to solve the problem of inconvenient operation of the conventional implantation syringe.

The above purpose is realized by the following technical scheme:

an implant injector, comprising: an injection needle, an outer sleeve, a preparation receiving part, an inner sleeve, a syringe push rod and a piston,

the injection needle is fixedly connected with the front end of the outer sleeve, the preparation receiving part is fixedly arranged in the outer sleeve, and the front end of a preparation accommodating cavity in the preparation receiving part is communicated with the inner cavity of the injection needle through the front end of the outer sleeve;

the outer sleeve is axially and slidably arranged outside the inner sleeve, a radial clamping part extending inwards is arranged on the inner wall of the outer sleeve, and the radial clamping part is provided with a first position for limiting the outer sleeve to axially slide;

the syringe push rod and the inner sleeve are axially arranged in a sliding manner, the piston is fixedly arranged in the syringe push rod, and the front end of the piston corresponds to the preparation accommodating cavity of the preparation receiving part;

when the syringe push rod axially slides towards the front end of the inner sleeve, the piston slides forwards along the preparation accommodating cavity, and when the syringe push rod enters the inner part of the outer sleeve, the radial clamping part is separated from the first position by the outward acting force of the syringe push rod so as to release the axial sliding limitation of the outer sleeve.

In one embodiment, the outer sleeve has two extreme positions of axial sliding relative to the inner sleeve, and the radial engaging portion is located at the first position to limit the axial sliding of the outer sleeve when the outer sleeve is located at either extreme position.

The invention has the beneficial effects that: the injection syringe is characterized in that the inner wall of the outer sleeve of the injection syringe is provided with a radial clamping part extending inwards, the radial clamping part can limit the axial sliding of the outer sleeve relative to the inner sleeve, and when the push rod of the injection syringe is pushed to axially slide towards the front end of the inner sleeve, the outer sleeve is limited to slide by the radial clamping part, so that the injection needle is always kept at the original position, and the preparation can be pushed to the preset position by the piston.

The outer sleeve of the implantation syringe has two limit positions which axially slide relative to the inner sleeve, when the outer sleeve is pulled to remove the injection needle from subcutaneous tissues, the outer sleeve slides towards the rear end of the inner sleeve to the limit positions, the radial clamping part is positioned at the first position to limit the axial sliding of the outer sleeve, namely, after the implantation syringe is used, the outer sleeve and the inner sleeve are locked together again, and the syringe is prevented from being reused.

Drawings

FIG. 1 is a schematic structural view of an implantation syringe according to an embodiment of the present invention;

FIG. 2 is a schematic view of the outer sleeve of an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the outer sleeve in one embodiment of the implantation syringe of the present invention;

FIG. 4 is a schematic view of the rear portion of the inner sleeve in an embodiment of the present invention;

FIG. 5 is a cross-sectional view of the rear portion of the inner sleeve in one embodiment of the implant injector of the present invention;

FIG. 6 is a schematic view of the front portion of the inner sleeve of an embodiment of the present invention;

FIG. 7 is a cross-sectional view of the front portion of the inner sleeve in one embodiment of the implantation syringe of the present invention;

FIG. 8 is a schematic view of the injector ram of an embodiment of the present implantation injector;

FIG. 9 is a cross-sectional view of the injector ram in an embodiment of the implantation injector of the present invention;

FIG. 10 is a schematic view of the needle guard of the present invention in an embodiment of the implantation syringe; FIG. 11 is a cross-sectional view of the needle guard of one embodiment of the implantation syringe of the present invention;

FIG. 12 is a schematic view of the structure of the preparation receiving part in an embodiment of the implanting syringe of the present invention; FIG. 13 is a schematic view of the structure of the plunger stop of one embodiment of the implantation syringe of the present invention; FIG. 14 is an initial state view of one embodiment of the implantation syringe of the present invention;

FIG. 15 is an enlarged view of a portion of FIG. 14 at A;

FIG. 16 is an intermediate state view of one embodiment of the implantation syringe of the present invention;

FIG. 17 is an enlarged view of a portion of FIG. 16 at B;

FIG. 18 is an end view of one embodiment of the implantation syringe of the present invention;

fig. 19 is a partial enlarged view of fig. 18 at C.

Wherein:

100-syringe needle;

200-an outer sleeve;

210-an injection needle base;

220-a radial engagement portion;

221-card slot;

222-a bevel;

230-a stopper resilient arm;

240-ribs;

300-a formulation receiving portion;

310-a preparation containing cavity;

320-a slit;

400-inner sleeve;

410-front cross bridge;

420-sliding long hole;

430-rear cross bridge;

440-inner sleeve front;

441-a head; 4411-major axis outer edge; 4412-minor axis outer rim;

442-connecting rods;

450-inner sleeve rear;

451-plug hole;

500-injector ram;

510-a pushing part;

600-a piston;

700-needle protection cap;

710-short slot;

720-an abutment;

800-a push rod stop;

810-a snap ring;

820-a latch;

830-handle.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following is a detailed description of the implantation syringe of the present invention by way of example, with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The numbering of the components themselves, such as "first", "second", etc., is used herein only to distinguish between the objects depicted and not to have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 and 14, the present invention provides an implant injector comprising: an injection needle 100, an outer sleeve 200, an agent receiving part 300, an inner sleeve 400, a syringe push rod 500 and a plunger 600.

Referring to fig. 2 and 3, the front end of outer sleeve 200 has a needle base 210, and the rear end of needle 100 is inserted into needle base 210 and fixedly connected to the front end of outer sleeve 200. The inner part of the outer sleeve 200 connected with the needle base 210 is provided with a mounting seat, the front end of the preparation receiving part 300 is inserted into the mounting seat and fixedly arranged in the outer sleeve 200, the front end of a preparation accommodating cavity 310 in the preparation receiving part 300 is communicated with the inner cavity of the needle 100 through the front end of the outer sleeve 200, and the preparation accommodating cavity 310 and the inner cavity of the needle 100 are coaxial.

The outer sleeve 200 is axially slidably disposed outside the inner sleeve 400, the inner wall of the outer sleeve 200 is provided with a radially engaging portion 220 extending inward, and the radially engaging portion 220 has a first position for restricting the axial sliding of the outer sleeve 200.

As shown in fig. 14, the syringe push rod 500 is axially slidably disposed with the inner sleeve 400, the rear end of the piston 600 is inserted into the syringe push rod 500, the rear end is fixedly connected with the syringe push rod 500, and the front end of the piston 600 corresponds to the preparation accommodating chamber 310 of the preparation receiving part 300, and in this embodiment, the front end of the piston 600 is inserted into the preparation accommodating chamber 310 in an initial state.

In the initial state, the radial engaging portion 220 is located at the first position so that the outer sleeve 200 and the inner sleeve 400 are locked, and the outer sleeve 200 cannot slide axially relative to the inner sleeve 400. When the operator pushes the syringe push rod 500 to axially slide toward the front end of the inner sleeve 400, the piston 600 slides forward along the preparation containing chamber 310, and the injection needle 100 is always held at the original position since the outer sleeve 200 is restricted from sliding by the radial catching portion 220. When the syringe push rod 500 enters the outer sleeve 200, the radial engaging portion 220 is forced by the syringe push rod 500 to move away from the first position to release the axial sliding restriction of the outer sleeve 200, and at this time, the outer sleeve 200 and the inner sleeve 400 are unlocked, and the outer sleeve 200 can slide toward the rear end of the inner sleeve 400 to drive the injection needle 100 to move out of the subcutaneous tissue.

In the present embodiment, in order to make the radial engaging portion 220 located at the first position in the initial state and be able to be separated from the first position when receiving the force of the syringe plunger 500, as shown in fig. 2 and 3, a stopper elastic arm 230 is disposed on the cylindrical wall of the outer sleeve 200, one end of the stopper elastic arm 230 is connected to the cylindrical wall of the outer sleeve 200, and the other end is a free end having a radial swing space, and the radial engaging portion 220 is disposed at the free end of the stopper elastic arm 230. The stop elastic arm 230 is made of a material with a certain elasticity, such as plastic, so that it can deform when receiving a certain acting force, and drive the radial engaging portion 220 to swing outward to separate from the first position. Of course, the radial engaging portion 220 does not have to be connected to the outer sleeve 200 through the stopper elastic arm 230, but in other embodiments, the radial engaging portion 220 may be connected to the wall of the outer sleeve 200 in a brittle manner, and when the radial engaging portion 220 is pushed outward by the syringe plunger 500 to a certain extent, the portion of the radial engaging portion 220 connected to the outer sleeve 200 in a brittle manner is broken, so that the radial engaging portion 220 is separated from the first position, and the locked state between the outer sleeve 200 and the inner sleeve 400 is released.

In the present embodiment, in order to achieve the locking and unlocking states of the radial engaging portion 220 and the inner sleeve 400, further, the radial engaging portion 220 is provided with a locking groove 221, and a notch of the locking groove 221 faces the inside of the outer sleeve 200. Referring to fig. 4 and 5, the inner sleeve 400 has a front transverse bridge 410 on the wall thereof, and when the radial engaging portion 220 is at the first position, the front transverse bridge 410 is located in the engaging groove 221. In other embodiments, the positions of the locking groove 221 and the front transverse bridge 410 may also be interchanged, and the locking and unlocking states of the radial engaging portion 220 and the inner sleeve 400 may also be achieved, for example, the front transverse bridge 410 is disposed on an end surface of the radial engaging portion 220 facing the inside of the outer sleeve 200, the locking groove 221 is disposed on an outer side of a cylinder wall of the inner sleeve, and when the front transverse bridge 410 is located in the locking groove 221, the outer sleeve 200 is locked with the inner sleeve 400 through the radial engaging portion 220; when the front cross bridge 410 is disengaged from the engaging groove 221, the radial engaging portion 220 is unlocked from the inner sleeve 400.

Further, as shown in fig. 3, the side of the locking groove 221 facing the rear portion of the outer sleeve 200 is provided with a slope 222, and the slope 222 extends from the rear portion to the interior of the front outer sleeve 200, as shown in fig. 8 and 9, the front end of the syringe push rod 500 is provided with a pushing portion 510 capable of contacting with the slope 222. When the syringe push rod 500 slides forward from the rear end, the pushing portion 510 of the syringe push rod 500 contacts the inclined surface 222 and applies a forward pushing force to the inclined surface 222, which generates a radially outward component force on the inclined surface 222 to swing the radial engaging portion 220 outward away from the first position. Of course, the positions of the pushing portion 510 and the inclined surface 222 may be interchanged, for example, the inclined surface 222 is disposed at the front end of the syringe plunger 500, the pushing portion 510 is disposed at the side of the slot 221 facing the rear of the outer sleeve 200, and when the syringe plunger 500 slides forward from the rear end, the pushing portion 510 slides along the inclined surface 222, so that the radial engaging portion 220 swings outward away from the first position.

In this embodiment, the syringe plunger 500 is disposed inside the inner sleeve 400, as shown in fig. 4, the inner sleeve 400 has a long sliding hole 420 extending axially on the wall thereof, as shown in fig. 8, the pushing portion 510 is a protrusion protruding radially outward from the front end of the syringe plunger 500, the protrusion extends into the long sliding hole 420, when the radial engaging portion 220 is located at the first position, the inclined surface 222 is located in the long sliding hole 420, the front transverse bridge 410 is located at the front end of the long sliding hole 420, and in the initial state, as shown in fig. 14 and 15, the radial engaging portion 220 is located at the first position, the front transverse bridge 410 is located in the engaging groove 221, and the inclined surface 222 is located in the long sliding hole 420 and faces the rear of the outer sleeve 200; when the syringe push rod 500 slides towards the front end of the inner sleeve 400, the pushing part 510 slides forwards in the sliding long hole 420, when the pushing part 510 contacts with the inclined surface 222, a radial outward pushing force is generated on the inclined surface 222, the inclined surface 222 and the clamping groove 221 move outwards until the inclined surface 222 is disengaged from the sliding long hole 420, at this time, the radial clamping part 220 leaves the first position, and the outer sleeve 200 and the inner sleeve 400 are unlocked, as shown in fig. 16 and 17.

In this embodiment, after the outer sleeve 200 and the inner sleeve 400 are unlocked, the operator pulls the outer sleeve 200 backward to slide toward the rear end of the inner sleeve 400, and the inclined surface 222 and the locking groove 221 pass the pushing portion 510 and then return to the sliding long hole 420 again under the driving of the stopper elastic arm 230, and a rear transverse bridge 430 is disposed in the sliding long hole 420 near the rear end of the inner sleeve 400, and the rear transverse bridge 430 has a width matched with the locking groove 221, and when the outer sleeve 200 slides backward to the limit position, the inclined surface 222 passes the rear transverse bridge 430, and the rear transverse bridge 430 enters the locking groove 221, and at this time, the radial engaging portion 220 is located at the first position to lock the outer sleeve 200 and the inner sleeve 400 again, as shown in fig. 16 and 17. At this point, needle 100 has been removed from the subcutaneous tissue, the implanted syringe completes the injection of the formulation, and outer sleeve 200 is locked again with inner sleeve 400 to prevent the implanted syringe from being reused.

In this embodiment, the outer sleeve 200 has two axially sliding extreme positions relative to the inner sleeve 400, wherein in the initial state the outer sleeve 200 is in a forward extreme position relative to the inner sleeve 400 and in the final state when the outer sleeve 200 is slid backwards relative to the inner sleeve 400 to a rearward extreme position. When the outer sleeve 200 is located at any one of the limit positions, the radial engaging portion 220 is located at the first position to limit the axial sliding of the outer sleeve 200, and the outer sleeve 200 and the inner sleeve 400 are locked in the initial state in order to keep the injection needle 100 at the original position all the time when the syringe push rod 500 is pushed to axially slide towards the front end of the inner sleeve 400, so that the preparation can be pushed to the preset position by the piston 600; the outer sleeve 200 and the inner sleeve 400 are locked again in the end state in order to restrict the forward sliding of the injection needle 100, thereby preventing a person from being injured by the needle and preventing the syringe from being reused.

As shown in fig. 18, when the outer sleeve 200 is slid to the limit position toward the rear end of the inner sleeve 400, the front end of the plunger 600 protrudes from the front end of the injection needle 100, and in the end state, the front end of the plunger 600 protrudes from the front end of the injection needle 100, so that the sharp front end of the injection needle 100 can be prevented from pricking a person.

As shown in fig. 4 and 6, in the present embodiment, the inner sleeve 400 includes an inner sleeve front portion 440 and an inner sleeve rear portion 450, wherein the inner sleeve front portion 440 includes a head portion 441 and two symmetrically disposed connecting rods 442. Referring to fig. 2, the front end of the outer sleeve 200 has two through holes penetrating the interior, two connecting rods 442 respectively penetrate through the through holes and enter the outer sleeve 200 to be fixedly connected with the front end of the rear portion 450 of the inner sleeve, and the head 441 is sleeved on the exterior of the needle base 210 at the front end of the outer sleeve 200. In the present embodiment, the front cross bridge 410, the slide long hole 420, and the rear cross bridge 430 are disposed on the wall of the rear portion 450 of the inner sleeve. When outer sleeve 200 is slid toward the rear end of inner sleeve 400, two connecting rods 442 extend forward from the through holes at the front end of outer sleeve 200, and head 441 extends toward the front end of needle 100, as shown in fig. 18, in the closed state, head 441 is close to the front end of needle 100, further preventing needle 100 from pricking a person.

As shown in fig. 1, the injection syringe further comprises a needle protection cap 700, and a plug structure is provided between the needle protection cap 700 and the outer wall of the front portion of the outer sleeve 200 for fixedly connecting the needle protection cap 700 to the front portion of the outer sleeve 200, and the needle protection cap 700 can protect the needle 100 before and after the injection syringe is used, thereby preventing the needle 100 from being contaminated and injuring people by needle puncture.

Referring to fig. 2 and 10, in this embodiment, a plurality of short slots 710 are uniformly arranged on the circumference of the opening of the needle protection cap 700, a plurality of ribs 240 are circumferentially distributed on the outer wall of the front portion of the outer sleeve 200, the ribs 240 and the short slots 710 form an insertion structure, and when the needle protection cap 700 is covered on the front portion of the outer sleeve 200, the ribs 240 are inserted into the short slots 710, and the needle protection cap 700 is connected to the outer sleeve 200.

Meanwhile, if the inner sleeve 400 and the outer sleeve 200 slide relative to each other by an external force in the initial state, the radial engaging portion 220 is damaged, and in order to avoid this, it is necessary to restrict the relative sliding between the inner sleeve 400 and the outer sleeve 200 in the initial state. In the present embodiment, as shown in fig. 6 and 7, the head portion 441 of the inner sleeve front portion 440 is tapered, the head portion 441 having a pair of major axis outer edges 4411 which are radially wide and a pair of minor axis outer edges 4412 which are radially narrow; as shown in fig. 11, the needle protecting cap 700 has an abutting portion 720 on its inner wall, and when the needle protecting cap 700 is initially fitted over the front end of the outer sleeve 200, the abutting portion 720 on the inner wall of the needle protecting cap 700 abuts against the outer edge 4411 of the long shaft of the head 441, and at this time, the needle protecting cap 700 restricts the inner sleeve 400 from sliding forward relative to the outer sleeve 200, so as to prevent the inner sleeve 400 or the outer sleeve 200 from sliding relative to each other when being impacted by an external force, and thus, the radial engaging portion 220 from being damaged by an impact. In the end state, the needle protection cap 700 can be covered on the front end of the outer sleeve 200, and since the head 441 is protruded forward relative to the outer sleeve 200, the needle protection cap 700 can be rotated by a certain angle, for example, 90 ° to make the abutment 720 face the side where the short axis outer rim 4412 is located, in order to avoid the abutment 720 on the inner wall of the needle protection cap 700 abutting against the long axis outer rim 4411 of the head 441, and the head 441 can smoothly enter the needle protection cap 700.

As shown in fig. 12, in the present embodiment, the preparation receiving portion 300 is a cylindrical body, two symmetrical slits 320 are formed on a side wall of the cylindrical body, and the slits 320 extend along the preparation receiving portion 300 and the axial direction and are communicated with the preparation accommodating chamber 310. The slit 320 allows the side wall of the preparation receiving part 300 to be elastically deformed, and when the preparation is loaded into the preparation containing chamber 310 in the preparation receiving part 300, the side wall of the preparation receiving part 300 is elastically deformed to clamp the preparation, thereby preventing the preparation from falling off from the preparation receiving part 300 in an initial state.

At the same time, axial sliding of the syringe plunger 500 relative to the inner barrel 400 under impact of external forces should also be avoided prior to use of the syringe. In this embodiment, the implant syringe further includes a ram stop member 800, as shown in FIG. 1, which is removably mountable to the inner sleeve 400 to limit axial sliding movement of the syringe ram 500 toward the forward end of the inner sleeve 400. Specifically, as shown in fig. 13 and 4, the push rod stopping member 800 includes a snap ring 810, a latch 820 and a handle 830, wherein the latch 820 and the handle 830 are respectively disposed on an inner wall and an outer wall of the snap ring 810; the rear end of the inner sleeve rear part 450 is provided with a jack 451, before the injector is used, the snap ring 810 is clamped on the outer side of the inner sleeve rear part 450, so that the bolt 820 enters the inner sleeve rear part 450 from the jack 451, the sliding of the injector push rod 500 to the front end of the inner sleeve 400 can be limited, and the injector push rod 500 is prevented from sliding axially relative to the inner sleeve 400 under the impact of external force, so that the injector is prevented from being out of work; in use, pulling the handle 830 disengages the collar 810 from the inner sleeve rear portion 450, the latch is removed from the receptacle 451, and the syringe plunger 500 is released from its forward sliding restriction for use.

The working process of the embodiment comprises the following three stages:

first, initial state

As shown in fig. 14 and 15, the implantation syringe of the present embodiment is in an initial state before use, in which the radial direction engaging portion 220 of the outer sleeve 200 is located at the first position, that is, the engaging groove 221 and the inclined surface 222 are located in the sliding long hole 420 of the rear portion 450 of the inner sleeve, the front cross bridge 410 is located in the engaging groove 221, and the outer sleeve 200 and the inner sleeve 400 are locked together by the radial direction engaging portion 220.

In use, the plunger stop means 800 is removed from the inner sleeve 400 and the needle protection cap 700 is removed from the outer sleeve 200. The injection needle 100 is inserted into the subcutaneous tissue of the human or animal body, the head 441 of the front part 440 of the inner sleeve abuts against the outside of the subcutaneous tissue, the syringe push rod 500 is pushed to slide toward the front end of the inner sleeve 400, and the preparation is pushed from the preparation receiving part 300 into the injection needle 100.

Second, intermediate state

As shown in Figs. 16 and 17, when the syringe plunger 500 slides forward into the outer sleeve 200, the pushing portion 510 at the front end of the syringe plunger 500 contacts the inclined surface 222 and exerts a radially outward force on the inclined surface 222, which causes the stopper resilient arm 230 to swing outward to move the radial engaging portion 220 out of the first position, at which time the outer sleeve 200 is unlocked from the inner sleeve 400, the syringe plunger 500 slides forward to the limit position, and the preparation is pushed into the needle 100 by the piston 600.

Then, by pulling the outer sleeve 200 backward to slide the outer sleeve 200 toward the rear end of the inner sleeve 400, the needle 100 is slid backward together with the outer sleeve 200 and gradually removed to the outside of the subcutaneous tissue, and since the inner sleeve 400, the syringe push rod 500 and the plunger 600 are fixed to the subcutaneous tissue at this time, the preparation is released from the front end of the needle 100 and remains in the subcutaneous tissue during the backward sliding of the needle 100.

Third, termination state

As shown in fig. 18 and 19, when the outer sleeve 200 is slid backward to the limit position, the front end of the plunger 600 protrudes from the front end of the injection needle 100, the inclined surface 222 of the radial clamping portion 220 slides backward along the sliding long hole 420 until it goes over the rear cross bridge 430, so that the rear cross bridge 430 enters the groove 221, and at this time, the radial clamping portion 220 is again in the first position to lock the outer sleeve 200 and the inner sleeve 400 again, and the injection needle protection cap 700 is rotated 90 ° to cover the front end of the outer sleeve 200, thereby completing the whole using process.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An implant injector, comprising: an injection needle (100), an outer sleeve (200), a preparation receiving part (300), an inner sleeve (400), a syringe push rod (500) and a piston (600),

the injection needle (100) is fixedly connected with the front end of the outer sleeve (200), the preparation receiving part (300) is fixedly arranged inside the outer sleeve (200), and the front end of a preparation accommodating cavity (310) in the preparation receiving part (300) is communicated with the inner cavity of the injection needle (100) through the front end of the outer sleeve (200);

the outer sleeve (200) is axially and slidably arranged outside the inner sleeve (400), a radial clamping part (220) extending inwards is arranged on the inner wall of the outer sleeve (200), and the radial clamping part (220) has a first position for limiting the axial sliding of the outer sleeve (200);

the syringe push rod (500) and the inner sleeve (400) are axially arranged in a sliding manner, the piston (600) is fixedly arranged inside the syringe push rod (500), and the front end of the piston (600) corresponds to the preparation accommodating cavity (310) of the preparation receiving part (300);

when the syringe push rod (500) axially slides towards the front end of the inner sleeve (400), the piston (600) slides forwards along the preparation accommodating cavity (310), and when the syringe push rod (500) enters the inner part of the outer sleeve (200), the radial clamping part (220) is separated from the first position by the outwards acting force of the syringe push rod (500) so as to release the axial sliding limitation of the outer sleeve (200).

2. The implantation syringe according to claim 1, wherein a stopper elastic arm (230) is disposed on the cylindrical wall of the outer sleeve (200), one end of the stopper elastic arm (230) is connected to the cylindrical wall of the outer sleeve (200), the other end is a free end having a radial swing space, and the radial engaging portion (220) is disposed at the free end of the stopper elastic arm (230).

3. The implantation syringe according to claim 2, characterized in that the radial engagement portion (220) is provided with a catch (221), the notch of the catch (221) facing towards the inside of the outer sleeve (200), the inner sleeve (400) having a cylindrical wall provided with a front transverse bridge (410), the front transverse bridge (410) being located in the catch (221) when the radial engagement portion (220) is in the first position.

4. The implantation syringe according to claim 3, wherein a side of the catching groove (221) facing the rear portion of the outer sleeve (200) is provided with a slope (222), the slope (222) extends from the rear to the front inside the outer sleeve (200), and the front end of the syringe plunger (500) has a pushing portion (510) capable of contacting with the slope (222).

5. The implant syringe according to claim 4, wherein the syringe plunger (500) is disposed inside the inner sleeve (400), the inner sleeve (400) has a cylindrical wall formed with an axially extending slide slot (420), the pushing portion (510) is disposed inside the slide slot (420), and the inclined surface (222) is disposed inside the slide slot (420) when the radial engaging portion (220) is in the first position.

6. The implant syringe according to claim 5, characterized in that a rear transverse bridge (430) is provided in the slide long hole (420) near the rear end of the inner sleeve (400), the rear transverse bridge (430) having a width adapted to the catching groove (221).

7. The implantation syringe according to any one of claims 1 to 6, wherein the outer sleeve (200) has two extreme positions of axial sliding with respect to the inner sleeve (400), the radial engagement portion (220) being in the first position to limit the axial sliding of the outer sleeve (200) when the outer sleeve (200) is in either extreme position.

8. The implant syringe according to claim 7, characterized in that the front end of the plunger (600) protrudes out of the front end of the injection needle (100) when the outer sleeve (200) is slid to the extreme position towards the rear end of the inner sleeve (400).

9. The implant syringe according to claim 1, wherein the inner sleeve (400) comprises an inner sleeve front portion (440) and an inner sleeve rear portion (450), a rear end of the inner sleeve front portion (440) being fixedly connected to a front end of the inner sleeve rear portion (450) from a front end of the outer sleeve (200) inserted therein;

the inner sleeve front part (440) is sleeved outside the injection needle (100).

10. The implantation syringe according to claim 9, further comprising a needle protection cap (700), wherein a plug-in structure is provided between the needle protection cap (700) and the front outer wall of the outer sleeve (200), for fixedly connecting the needle protection cap (700) to the front of the outer sleeve (200).

11. The implant injector according to claim 10, wherein the front end of the inner sleeve front portion (440) has a tapered head portion (441), the head portion (441) having a pair of major axis outer edges (4411) which are wider in a radial direction and a pair of minor axis outer edges (4412) which are narrower in the radial direction;

the inner wall of the injection needle protection cap (700) is provided with an abutting part (720) which is abutted and matched with the outer edge (4411) of the long shaft of the head part (441).

12. The implanting syringe of claim 10, wherein the opening of the needle protecting cap (700) is circumferentially and uniformly provided with a plurality of short slots (710), the outer wall of the front part of the outer sleeve (200) is circumferentially distributed with a plurality of ribs (240), and the ribs (240) and the short slots (710) form a plug structure.

13. The implant syringe according to claim 1, wherein the preparation receiving part (300) is a cylindrical body, and two symmetrical slits (320) are formed in a side wall of the cylindrical body, and the slits (320) extend along the preparation receiving part (300) and in the axial direction.

14. The implant syringe of claim 1, further comprising a ram stop member (800), the ram stop member (800) being removably mountable on the inner sleeve (400) to limit axial sliding of the syringe ram (500) toward a forward end of the inner sleeve (400).