CN220495373U - Disposable sterile implant agent feeder - Google Patents

Abstract

The utility model belongs to the technical field of medical appliances, and discloses a disposable sterile implant drug feeder, which comprises a push rod and a needle tube, wherein a safety device is arranged on the push rod; a limiting piece is arranged in the needle tube lower cover at the lower end of the needle tube, and a spring is arranged between the limiting piece and the needle tube lower cover; the bottom of the needle tube is provided with a spring buckle, and the limiting piece is provided with a limiting piece convex point which is clamped with a compression spring; push rod salient points are arranged at the bottom end of the push rod corresponding to the elastic buckle, and the bottom end of the push rod is fixedly connected with a stainless steel column; the bottom end of the limiting piece is fixedly connected with a needle head, and the needle head extends outwards and is sleeved with a needle head protective sleeve; the needle is preloaded with the implant, the limiting piece is provided with a central hole communicated with the needle, and the bottom end of the stainless steel column is inserted into the central hole of the limiting piece in a sliding way and can push the implant to be implanted; when the push rod pushes the bottom of the needle tube, the push rod protruding points extrude the elastic buckle to release the limit, and the spring returns to drive the limit piece and the needle to rebound to the inside of the needle tube. The utility model has simple production and assembly, convenient operation, can avoid secondary use and is safe to recycle.

Description

Disposable sterile implant agent feeder

Technical Field

The utility model belongs to the technical field of medical appliances, and particularly relates to a disposable sterile implant drug feeder.

Background

The implant (Implants) refers to a sterile solid preparation for implantation made of medicines and auxiliary materials, and an instrument for implanting the implant into the body is an implant administration instrument. In order to avoid cross infection of viruses caused by irregular disinfection of the implant drug administration device, a disposable sterile implant drug administration device is mostly adopted in the existing medical process. However, existing implant applicators suffer from the following drawbacks:

(1) After the disposable sterile implant drug delivery device is used, the needle is exposed outside, so that people are easily injured in the treatment process, the risk of being punctured and infected exists, and the safety treatment and recovery are not facilitated;

(2) The disposable sterile implant drug delivery device can be recovered for repeated use after being used, which is contrary to the original purpose of disposable implant drug delivery device, is easy to cause cross infection and is not sanitary enough.

Patent document CN114404732a discloses a medical self-destruction type disposable aseptic implantation injector, which comprises a clamping mechanism and a needle tube, wherein the needle tube is arranged on the clamping mechanism in a sliding manner; the lower part of the inner side of the needle tube is provided with a needle in a sliding manner; the upper part of the inner side of the needle tube is provided with a sliding piston which is matched with the needle head; the pressing mechanism is arranged on the clamping mechanism. According to the disposable sterile implant drug feeder, the injection of the liquid medicine can be rapidly and accurately completed through the cooperation of the needle tube, the needle head, the piston, the clamping mechanism, the pressing mechanism and the clamping mechanism, and the needle head can be fed into the needle tube after the injection of the liquid medicine is completed, so that the disposable sterile implant drug feeder is prevented from being used by a person for the second time. However, the common structure of the self-destruction injector is complex, so that the production cost is high, the assembly is difficult, and the self-destruction injector is suitable for liquid medicament injection and is not suitable for solid implant administration.

Patent document CN209237055U discloses a disposable syringe, including the syringe, syringe one end is provided with the injection joint, be connected with the injection needle on the injection joint, be provided with the sealing plug that removes along the syringe inner chamber in the syringe, be connected with the injection pole that stretches out the syringe on the sealing plug, the one end that the syringe inner chamber kept away from the injection joint has set firmly the baffle ring, the baffle ring internal diameter reduces towards the injection joint direction gradually, the last stop ring that has set firmly of injection pole, the stop ring diameter is less than syringe internal diameter and is greater than the minimum internal diameter of baffle ring, the sealing plug is when being close to the terminal surface that the injection connects in the syringe, the stop ring is located between baffle ring and the injection joint. The disposable injector provided by the patent utilizes the limiting ring and the baffle ring to limit, so that the disposable injector cannot be reused, the structure is simple, the disposable injector is suitable for liquid medicament injection, is not suitable for solid implant administration, and the needle tube is exposed after the disposable injector is used, so that huge potential safety hazards exist, the problem of easy stabbing is solved, and the safety treatment and recovery are not facilitated.

Disclosure of Invention

The utility model aims to solve at least one technical problem existing in the prior art or related technology, and provides a disposable sterile implant drug feeder which is simple to produce and assemble, convenient to use and operate, and can prevent a needle from rebounding into a needle tube after use and being reused by a person, and is beneficial to safe treatment and recovery.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

a disposable sterile implant drug delivery device, which comprises a push rod component, a needle tube component and a needle head component; the needle head assembly comprises a needle head and a needle head protective sleeve;

the push rod is connected in the needle tube in a sliding way, and a safety device is arranged on the push rod in a pluggable manner; the upper end of the needle tube is provided with a needle tube upper cover, and the lower end of the needle tube is provided with a needle tube lower cover; the limiting piece is positioned at the bottom of the needle tube cavity and is abutted against the needle tube lower cover, and a spring is arranged between the limiting piece and the needle tube lower cover; the bottom pipe wall of the needle pipe is provided with a spring buckle, and the outer wall of the limiting piece is provided with a limiting piece salient point; the elastic buckle is clamped with the limiting piece through the convex points, and the limiting piece is fixed at the bottom of the needle tube cavity in a limiting mode and limits the compression spring; a push rod salient point is arranged on the outer wall of the bottom end of the push rod corresponding to the elastic buckle, and the bottom end of the push rod is fixedly connected with the stainless steel column; the bottom end of the limiting piece is fixedly connected with a needle head, and the needle head extends out to the bottom end of the needle tube lower cover and is sleeved with a needle head protecting sleeve;

the needle head is preloaded with an implant, the limiting piece is provided with a central hole communicated with the needle head, the bottom end of the stainless steel column is inserted into the central hole of the limiting piece in a sliding manner, and the implant can be pushed out of the needle head under the pushing of the push rod; when the push rod is pushed to the bottom of the needle tube, the push rod protruding points are extruded to be buckled to release the limit of the limiting piece, and meanwhile, the spring is reset to drive the limiting piece and the needle to rebound to the inside of the needle tube.

Further, an open slot is arranged on the bottom pipe wall of the needle tube, and a spring fastener extending into the pipe wall of the needle tube is arranged in the open slot.

Further, a push rod cap is arranged at the bottom end of the push rod, and two push rod protruding points are oppositely arranged at the periphery of the push rod cap; two elastic buckles are arranged on the needle tube corresponding to the two push rod convex points; two limiting piece protruding points are arranged on the limiting piece corresponding to the two elastic buckles.

Further, the elastic buckle and the pipe wall of the needle pipe are integrally formed; the push rod convex points are round convex points or square convex points, and the limiting piece convex points are square convex points.

Further, the limiting piece is of a stepped cylindrical shaft structure and comprises a first cylindrical shaft and a second cylindrical shaft, the shaft diameter of the first cylindrical shaft is larger than that of the second cylindrical shaft, and the position, corresponding to the elastic buckle, of the first cylindrical shaft is provided with a limiting piece salient point;

a first central hole is formed in the first cylindrical shaft in a penetrating manner, a second central hole is formed in the second cylindrical shaft in a penetrating manner, the first central hole is communicated with the second central hole, and the aperture of the first central hole is smaller than that of the second central hole; the bottom of the stainless steel column is slidably inserted into the first central hole, the needle head is fixedly inserted into the second central hole, and the implant is positioned in a cavity which is formed by the bottom of the stainless steel column, the first central hole and the needle head in a surrounding mode.

Further, a protruding shaft is arranged in the needle tube lower cover upwards, two-stage stepped holes are formed in the protruding shaft, the protruding shaft comprises a first stepped hole and a second stepped hole, and the aperture of the first stepped hole is smaller than that of the second stepped hole;

the bottom end of the first cylindrical shaft of the limiting piece is abutted against the protruding shaft, and the spring is sleeved on the periphery of the protruding shaft;

the second cylindrical shaft of the limiting piece is inserted into the first stepped hole of the protruding shaft, a slot is formed between the second cylindrical shaft and the second stepped hole, and the needle head protecting sleeve is inserted into the slot.

Further, two bump slideways are arranged on the inner wall of the needle tube corresponding to the two elastic buckles, and the push rod bumps slide to the bottom of the needle tube along the bump slideways to extrude the elastic buckles, so that the spring drives the limiting piece and the needle head to rebound in the needle tube, and the limiting piece bumps move along the bump slideways when the limiting piece rebounds.

Furthermore, two push rod lugs are arranged on the outer wall of the bottom end of the push rod relatively, two limit piece lugs are arranged on the limit piece corresponding to the push rod lugs, and two lug slide ways are arranged on the inner wall of the needle tube corresponding to the push rod lugs and the limit piece lugs;

when the push rod pushes down, the push rod lug moves down along the lug slideway; when the limiting piece rebounds, the limiting piece lug moves upwards along the lug slideway.

Further, an upper cover positioning groove matched with the push rod convex block is formed in the upper cover of the needle tube, and the upper cover positioning groove is used for aligning the initial position installation position of the push rod;

meanwhile, an upper cover positioning lug is inwards arranged on the needle tube upper cover corresponding to one of the upper cover positioning grooves, and a push rod positioning slide way matched with the upper cover positioning lug is arranged on the push rod and used for limiting the pushing-down track of the push rod, so that when the push rod is pushed downwards, the upper cover positioning lug moves relatively along the push rod positioning slide way.

Further, the needle tube upper cover is detachably screwed with the upper end of the needle tube, and the needle tube lower cover is integrally and fixedly connected with the lower end of the needle tube or detachably screwed with the upper end of the needle tube.

Further, a push rod head is fixedly arranged at the upper end of the push rod, and the outer end surface of the push rod head is a circular convex surface; the safety device is a strip-shaped baffle, and the push rod is provided with a slot for inserting the safety device.

Compared with the prior art, the utility model has the beneficial effects that:

(1) According to the disposable sterile implant drug delivery device, the limiting piece fixedly connected with the needle is elastically buckled at the bottom of the needle tube cavity, the compression spring is arranged between the limiting piece and the bottom end of the needle tube, after drug delivery is finished, the limiting piece is released from limiting by the needle tube through the extrusion and the elastic buckling of the bottom end of the push rod, so that the spring is reset and drives the limiting piece and the needle to rebound into the needle tube together, the disposable sterile implant drug delivery device can be effectively prevented from being used by a person for a second time, the needle is prevented from being exposed after the disposable sterile implant drug delivery device is used, safety treatment and recovery are facilitated, meanwhile, the syringe is simple in structure, convenient to produce and assemble, low in production cost and convenient to use and operate;

(2) According to the disposable sterile implant drug feeder provided by the utility model, the safety device is arranged on the push rod and can be inserted on the push rod in a pluggable manner, and the push rod can be limited and blocked from moving along the needle tube before use, so that the spring rebound caused by mistakenly touching the push rod in the process of transferring the syringe product is avoided, and the scrapping of the product when the product is not used is avoided;

(3) According to the disposable sterile implant drug feeder provided by the utility model, the bump slideway is arranged on the needle tube, the bump slideway is in one-to-one correspondence with the positions of the push rod bump, the elastic buckle and the limiting piece bump, when drug is fed, the push rod is pushed downwards, the push rod bump moves downwards along the bump slideway, so that the push rod bump accurately approaches the elastic buckle and the limiting piece bump along the bump slideway, the push rod bump can be ensured to successfully push the elastic buckle, the spring drives the limiting piece and the needle to rebound smoothly into the needle tube, and in the rebound process, the limiting piece bump of the limiting piece also moves upwards along the bump slideway, the risk that the limiting piece bump is blocked by the smooth tube wall of the needle tube can be avoided, and the rebound is ensured to be smooth;

(4) As a further improvement, two push rod convex blocks are arranged on the periphery of the push rod cap relatively, two limit piece convex blocks are arranged on the limit piece corresponding to the push rod convex blocks, and two convex block slide ways are arranged on the needle tube corresponding to the push rod convex blocks and the limit piece convex blocks; simultaneously, when the drug delivery finishes, when the spring drives the locating part to rebound, locating part bump and locating part lug on the locating part respectively follow bump slide, lug slide upward movement, can further avoid the locating part to rebound about when rotatory to reduce the risk of being blocked by the lug slide because of the atress is uneven when moving up to the locating part bump.

(5) As a further improvement, the upper cover of the needle tube is provided with an upper cover positioning groove matched with the push rod lug, and the upper cover positioning groove is used for aligning the initial position of the push rod so that the push rod lug can be aligned with the snap fastener and the limiting piece lug one by one; simultaneously, the needle tubing upper cover inwards is provided with upper cover positioning lug corresponding to one of them upper cover positioning groove, set up on the push rod with upper cover positioning lug complex push rod positioning slide for when restriction push rod pushes down the orbit, upper cover positioning lug follows when the push rod pushes down push rod positioning slide relative movement further ensures that the push rod pushes down the in-process and does not take place the rotation about, so that the implantation smoothly implants and the syringe needle kick-backs smoothly, further improved the reliability of dosing ware work.

Drawings

FIG. 1 is a schematic view of the overall structure of an applicator according to an embodiment of the present utility model;

FIG. 2 is a schematic view of an exploded construction of an applicator according to an embodiment of the present utility model;

FIG. 3 is a schematic view showing a semi-sectional structure of a dispenser according to an embodiment of the present utility model;

FIG. 4 is a schematic view of the connection of a needle tube assembly and a needle assembly of an applicator according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a partially enlarged structure of the applicator according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a partially enlarged structure of a push rod of the drug feeder according to an embodiment of the present utility model when pushing out the bottom of the needle tube and squeezing out the snap button;

FIG. 7 is a schematic view showing the structure of a push rod of the drug dispenser according to the embodiment of the present utility model;

FIG. 8 is a schematic view of the structure of a needle tube of the drug feeder according to the embodiment of the present utility model;

FIG. 9 is a schematic view of the stopper of the dispenser according to the embodiment of the present utility model;

FIG. 10 is a schematic view of the structure of the upper cover of the needle tube of the drug feeder according to the embodiment of the present utility model;

FIG. 11 is a schematic view of the structure of the syringe according to the embodiment of the present utility model before use;

FIG. 12 is a schematic view of the structure of the syringe according to the embodiment of the present utility model when the needle is retracted back into the needle tube after use;

the figure indicates: 1-a putter head; 2-a safety device; 3-push rod, 301-push rod convex points, 302-push rod convex points and 303-push rod positioning slide ways; 4-stainless steel columns; 5-needle tube upper cover, 501-upper cover positioning groove, 502-upper cover positioning convex block; 6-needle tube, 601-slide, 6011-bump slide, 6012-bump slide, 602-snap fastener, 603-open slot; 7-limit parts, 701-limit part convex points, 702-limit part convex points, 703-first cylindrical shafts and 704-second cylindrical shafts; 8-a needle; 9-a spring; 10-needle tube lower cover, 1001-convex shaft; 11-needle protective sleeve; 12-implant.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "another end," "upper," "one side," "top," "inner," "front," "center," "two ends," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.

1-4, embodiments of the present utility model provide a disposable sterile implant applicator comprising a push rod assembly, a needle cannula assembly, and a needle assembly; the push rod assembly comprises a push rod 3, a safety device 2 and a stainless steel column 4, the needle tube assembly comprises a needle tube upper cover 5, a needle tube 6, a needle tube lower cover 10, a limiting piece 7 and a spring 9, and the needle head assembly comprises a needle head 8 and a needle head protective sleeve 11.

The push rod 3 is slidably connected in the needle tube 6, and the push rod 3 is provided with a safety device 2 in a pluggable manner and used for limiting and blocking the push rod 3 from moving along the needle tube 6 before use; the upper end of the needle tube 6 is provided with a needle tube upper cover 5 for preventing the push rod 3 from being separated from the needle tube 6; the lower end of the needle tube 6 is provided with a needle tube lower cover 10, the limiting piece 7 is positioned at the bottom of the cavity of the needle tube 6 and is abutted against the needle tube lower cover 10, and a spring 9 is arranged between the limiting piece 7 and the needle tube lower cover 10; an open slot 603 is formed in the bottom pipe wall of the needle tube 6, a snap fastener 602 extending into the pipe wall of the needle tube 6 is arranged in the open slot 603, a limit piece protruding point 701 is arranged on the outer wall of the limit piece 7, the snap fastener 602 is clamped on the limit piece protruding point 701, and the limit piece 7 is fixed at the bottom of the needle tube cavity in a limiting manner and limits the compression spring 9; push rod salient points 301 are arranged on the outer wall of the bottom end of the push rod 3 corresponding to the elastic buckle, and the center of the bottom end of the push rod 3 is fixedly connected with the stainless steel column 4

In some embodiments, the upper needle tube cover 5 is detachably screwed with the upper end of the needle tube 6, and the lower needle tube cover 10 is fixedly connected with the lower end of the needle tube 6 in an integral mode, or is detachably screwed with the lower end of the needle tube 6, and the lower end of the needle tube is more convenient to assemble and disassemble.

The bottom end of the limiting piece 7 is fixedly connected with a needle head 8, and the needle head 8 extends out to the bottom end of the needle tube lower cover 10 and is sleeved with a needle head protective sleeve 11; the needle 8 is preloaded with an implant 12, the limiting piece 7 is provided with a central hole communicated with the needle 8, the bottom end of the stainless steel column 4 is slidably inserted into the central hole of the limiting piece 7, and the implant 12 can be pushed out of the needle 8 under the pushing of the push rod 3.

When the safety device is used, the safety device 2 and the needle head protective sleeve 11 are pulled out, the push rod 3 is pushed to drive the stainless steel column 4 to move downwards, the stainless steel column 4 pushes the implant 12 to be implanted, and at the moment, the snap 602 and the limit protruding points 701 keep a limit clamping state, as shown in fig. 5; when the push rod 3 pushes the bottom of the needle tube 6, referring to fig. 6, the push rod protruding point 301 at the bottom of the push rod 3 extrudes the snap button 602 towards the periphery of the tube wall, so that the snap button 602 moves into the open slot 603 and is separated from the protruding point 701 of the limiting piece, thereby releasing the limiting and fixing effect on the limiting piece 7, at the same time, the spring 9 returns to rebound, and drives the limiting piece 7 and the needle 8 to rebound inside the needle tube together.

The state of the disposable sterile implant applicator according to the embodiment of the present utility model before use is shown in fig. 11, and the state when the needle is rebounded to the needle tube after use is shown in fig. 12.

In some embodiments, referring to fig. 7, a push rod cap is disposed at the bottom end of the push rod 3, two push rod protruding points 301 are disposed at the periphery of the push rod cap, and the push rod protruding points 301 may be protruding parts such as round protruding points or square protruding points; referring to fig. 8, two buckles 602 are provided on the needle tube 6 corresponding to the push rod protruding points 301, and the buckles 602 and the tube wall of the needle tube 6 are integrally formed; referring to fig. 9, two stopper bumps 701 are provided on the stopper 7 corresponding to the two snap buttons 602, and the stopper bumps 701 are square bumps so as to be clamped with the snap buttons 602.

In some embodiments, the limiting member 7 is in a stepped cylindrical shaft structure, and includes a first cylindrical shaft 703 and a second cylindrical shaft 704, referring to fig. 9, the shaft diameter of the first cylindrical shaft 703 is larger than that of the second cylindrical shaft 704, and, as shown in fig. 4, the limiting member protruding point 701 is disposed on the first cylindrical shaft 703 at a position corresponding to the snap ring 602; the first cylindrical shaft 703 is provided with a first central hole in a penetrating manner, the second cylindrical shaft 704 is provided with a second central hole in a penetrating manner, the first central hole is communicated with the second central hole, the aperture of the first central hole is smaller than that of the second central hole, the bottom end of the stainless steel column 4 is slidably inserted into the first central hole, the needle 8 is fixedly inserted into the second central hole, and the implant 12 is positioned at the bottom of the stainless steel column 4 and in a cavity surrounded by the first central hole and the needle 8.

Meanwhile, a protruding shaft 1001 is provided upwards in the needle tube lower cover 10, two-stage stepped holes are provided in the protruding shaft 1001, the two-stage stepped holes comprise a first stepped hole and a second stepped hole, and the aperture of the first stepped hole is smaller than that of the second stepped hole; the bottom end of the first cylindrical shaft 703 of the limiting piece 7 is abutted against the protruding shaft 1001, and the spring 9 is sleeved on the periphery of the protruding shaft 1001; the second cylindrical shaft 704 of the limiting piece 7 is inserted into the first stepped hole of the protruding shaft 1001, and forms a slot with the second stepped hole, and the needle protecting sleeve 11 is inserted into the slot.

In some embodiments, a slide 601 (see fig. 2) is disposed on the inner wall of the needle cannula 6, and in particular, as shown in fig. 8, two protruding point slides 6011 are disposed on the inner wall of the needle cannula 6 corresponding to the two snap buttons 602.

The purpose of this arrangement is: when the medicine is administered, the push rod 3 pushes downwards, the push rod salient point 301 moves downwards along the salient point slideway 6011, so that the push rod salient point 301 accurately approaches to the elastic buckle 602 and the limiting part salient point 701 along the salient point slideway 6011, the elastic buckle 602 is ensured to be smoothly extruded by the push rod salient point 301, the spring 9 drives the limiting part 7 and the needle 8 to rebound smoothly in the needle tube 6, and in the rebound process, the limiting part salient point 701 of the limiting part 7 also moves upwards along the salient point slideway, the risk that the limiting part salient point 701 is blocked by the smooth tube wall of the needle tube 6 can be avoided, and the rebound smoothness is ensured.

In some embodiments, as a further improvement, two push rod protrusions 302 (see fig. 7) are also disposed on the periphery of the push rod cap of the push rod 3, two stopper protrusions 701 are disposed on the first cylindrical shaft 703 of the stopper 7 corresponding to the push rod protrusions 302, and two protrusion slides 6012 are disposed on the inner wall of the needle tube 6 corresponding to the push rod protrusions 302 and the stopper protrusions 702.

The purpose of this arrangement is: when the medicine is administered, the push rod 3 pushes downwards, the push rod convex point 301 and the push rod convex point 302 respectively move downwards along the convex point slide 6011 and the convex point slide 6012, so that the push rod 3 can be further prevented from rotating leftwards and rightwards when moving downwards, the push rod convex point 301 can be ensured to be more accurately and smoothly extruded to open the elastic buckle 602, and the risk that the push rod convex point 301 is blocked by the convex point slide 6011 due to uneven stress when sliding downwards can be reduced under the assistance of the push rod convex point 302 sliding downwards along the convex point slide 6012; meanwhile, when the drug delivery is finished and the spring 9 drives the limiting part 7 to rebound, the limiting part convex points 701 and 702 on the limiting part 7 move upwards along the convex point slide 6011 and the convex block slide 6012 respectively, so that the limiting part 7 can be further prevented from rotating left and right when rebounding upwards, and the risk that the limiting part convex points 701 are blocked by the convex block slide 6012 due to uneven stress when moving upwards is reduced.

As a further improvement, as shown in fig. 7 and 10, the needle tube upper cover 5 is provided with an upper cover positioning groove 501 matched with the push rod lug 302, and the upper cover positioning groove 501 is used for aligning the initial position of the push rod 3, so that the push rod lug 302 can be aligned with the snap button 602 and the limit piece lug 702 one by one.

Meanwhile, an upper cover positioning lug 502 is inwardly arranged on the needle tube upper cover 5 corresponding to one of the upper cover positioning grooves 501, and a push rod positioning slideway 303 matched with the upper cover positioning lug 502 is arranged on the push rod 3, so that when the push rod 3 is pushed downwards, the push track of the push rod 3 is limited, when the push rod 3 is pushed downwards, the upper cover positioning lug 502 moves relatively along the push rod positioning slideway 303, the push rod 3 is further ensured not to rotate left and right in the pushing process, the implant 12 is smoothly implanted, the needle 8 rebounds smoothly, and the working reliability of the drug feeder is further improved.

In some embodiments, the push rod tab 302 and the limiter tab 702 are square or wedge tabs.

In some embodiments, the upper end of the push rod 3 is fixedly provided with a push rod head 1, and the outer end surface of the push rod head 1 is a circular convex surface, so that the push rod operation is convenient for medical staff to perform by one hand.

In some embodiments, the safety device 2 is an elongated baffle, and the push rod 3 is provided with a slot for plugging the safety device 2.

The foregoing description is only exemplary of the utility model and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the scope of the present utility model should be included in the protection scope of the present utility model. Discarding.

Claims (11)

1. A disposable sterile implant applicator comprising a push rod assembly, a needle tube assembly and a needle assembly; the needle head assembly comprises a needle head and a needle head protective sleeve;

the push rod is connected in the needle tube in a sliding way, and a safety device is arranged on the push rod in a pluggable manner; the upper end of the needle tube is provided with a needle tube upper cover, and the lower end of the needle tube is provided with a needle tube lower cover; the limiting piece is positioned at the bottom of the needle tube cavity and is abutted against the needle tube lower cover, and a spring is arranged between the limiting piece and the needle tube lower cover; the bottom pipe wall of the needle pipe is provided with a spring buckle, and the outer wall of the limiting piece is provided with a limiting piece salient point; the elastic buckle is clamped with the limiting piece through the convex points, and the limiting piece is fixed at the bottom of the needle tube cavity in a limiting mode and limits the compression spring; a push rod salient point is arranged on the outer wall of the bottom end of the push rod corresponding to the elastic buckle, and the bottom end of the push rod is fixedly connected with the stainless steel column; the bottom end of the limiting piece is fixedly connected with a needle head, and the needle head extends out to the bottom end of the needle tube lower cover and is sleeved with a needle head protecting sleeve;

the needle head is preloaded with an implant, the limiting piece is provided with a central hole communicated with the needle head, the bottom end of the stainless steel column is inserted into the central hole of the limiting piece in a sliding manner, and the implant can be pushed out of the needle head under the pushing of the push rod; when the push rod is pushed to the bottom of the needle tube, the push rod protruding points are extruded to be buckled to release the limit of the limiting piece, and meanwhile, the spring is reset to drive the limiting piece and the needle to rebound to the inside of the needle tube.

2. The drug delivery device according to claim 1, wherein an opening groove is arranged on the bottom pipe wall of the needle tube, and a spring button extending into the pipe wall of the needle tube is arranged in the opening groove.

3. The drug delivery device according to claim 2, wherein a push rod cap is arranged at the bottom end of the push rod, and two push rod protruding points are oppositely arranged at the periphery of the push rod cap; two elastic buckles are arranged on the needle tube corresponding to the two push rod convex points; two limiting piece protruding points are arranged on the limiting piece corresponding to the two elastic buckles.

4. A dispenser according to claim 3, wherein the clip is integrally formed with the wall of the needle cannula; the push rod convex points are round convex points or square convex points, and the limiting piece convex points are square convex points.

5. The drug feeder according to claim 1, wherein the limiting piece is of a stepped cylindrical shaft structure and comprises a first cylindrical shaft and a second cylindrical shaft, the shaft diameter of the first cylindrical shaft is larger than that of the second cylindrical shaft, and the limiting piece salient points are arranged on the first cylindrical shaft at positions corresponding to the elastic buckles;

a first central hole is formed in the first cylindrical shaft in a penetrating manner, a second central hole is formed in the second cylindrical shaft in a penetrating manner, the first central hole is communicated with the second central hole, and the aperture of the first central hole is smaller than that of the second central hole; the bottom of the stainless steel column is slidably inserted into the first central hole, the needle head is fixedly inserted into the second central hole, and the implant is positioned in a cavity which is formed by the bottom of the stainless steel column, the first central hole and the needle head in a surrounding mode.

6. The drug delivery device according to claim 5, wherein a protruding shaft is arranged upwards in the lower cover of the needle tube, two-stage stepped holes are formed in the protruding shaft, the protruding shaft comprises a first stepped hole and a second stepped hole, and the aperture of the first stepped hole is smaller than that of the second stepped hole;

the bottom end of the first cylindrical shaft of the limiting piece is abutted against the protruding shaft, and the spring is sleeved on the periphery of the protruding shaft;

the second cylindrical shaft of the limiting piece is inserted into the first stepped hole of the protruding shaft, a slot is formed between the second cylindrical shaft and the second stepped hole, and the needle head protecting sleeve is inserted into the slot.

7. The drug delivery device according to claim 1, wherein two bump slideways are arranged on the inner wall of the needle tube corresponding to the two elastic buckles, and the push rod bumps slide to the bottom of the needle tube along the bump slideways to squeeze out the elastic buckles, so that the spring drives the limiting piece and the needle head to rebound inwards of the needle tube, and the limiting piece bumps move along the bump slideways when the limiting piece rebounds.

8. The drug delivery device according to claim 7, wherein two push rod lugs are arranged on the outer wall of the bottom end of the push rod relatively, two limit piece lugs are arranged on the limit piece corresponding to the push rod lugs, and two lug slide ways are arranged on the inner wall of the needle tube corresponding to the push rod lugs and the limit piece lugs;

when the push rod pushes down, the push rod lug moves down along the lug slideway; when the limiting piece rebounds, the limiting piece lug moves upwards along the lug slideway.

9. The dispenser of claim 8, wherein the needle cannula upper cover is provided with an upper cover positioning groove cooperating with the push rod projection, the upper cover positioning groove being used for aligning an initial installation position of the push rod;

meanwhile, an upper cover positioning lug is inwards arranged on the needle tube upper cover corresponding to one of the upper cover positioning grooves, and a push rod positioning slide way matched with the upper cover positioning lug is arranged on the push rod and used for limiting the pushing-down track of the push rod, so that when the push rod is pushed downwards, the upper cover positioning lug moves relatively along the push rod positioning slide way.

10. The applicator of any one of claims 1-9, wherein the needle cannula upper cap is removably threaded onto the upper end of the needle cannula and the needle cannula lower cap is integrally fixedly attached or removably threaded onto the lower end of the needle cannula.

11. The drug delivery device according to claim 10, wherein a push rod head is fixedly arranged at the upper end of the push rod, and the outer end surface of the push rod head is a circular convex surface; the safety device is a strip-shaped baffle, and the push rod is provided with a slot for inserting the safety device.