CN105193421B

CN105193421B - Real-time dynamic glucose single soft needle sensor and special needle assisting device thereof

Info

Publication number: CN105193421B
Application number: CN201410263723.0A
Authority: CN
Inventors: 郝刚; 张远; 吴庆峰
Original assignee: Irvine Investment Co ltd
Current assignee: Ji Xiaoyu
Priority date: 2014-06-13
Filing date: 2014-06-13
Publication date: 2020-05-05
Anticipated expiration: 2034-06-13
Also published as: CN105193421A

Abstract

A real-time dynamic glucose single soft needle sensor and a special needle assisting device thereof comprise an auxiliary needle, a sensing chip, a base which bears a detecting head and the sensing chip and is provided with a plurality of bayonets, and a base frame which is provided with a plurality of buckles. The base is provided with a detection hole, the detection hole is a through hole, the detection head extends out of the base downwards from the detection hole, the buckle is matched with the shape and the position of the bayonet for use, the auxiliary needle is provided with an axial tangent plane, and the auxiliary needle penetrates through the detection hole and covers the detection head. By adopting the sensor with the solution, the fixing effect of the probe penetrating into the subcutaneous tissue is better and more stable, the speed is high, and the operation is simple.

Description

Real-time dynamic glucose single soft needle sensor and special needle assisting device thereof

Technical Field

The invention relates to medical equipment, in particular to real-time dynamic glucose sensing equipment and a special needle assisting device thereof.

Background

In recent years, there have been a number of continuous dynamic blood glucose monitoring systems on the market that have a probe that is placed in the subcutaneous tissue, the probe requiring assistance from an auxiliary device to be placed in the subcutaneous tissue; in addition, since the monitoring of real-time dynamic blood glucose lasts for a long time, during which the patient performs various necessary activities to move muscles, the probe is displaced and even separated from the subcutaneous tissue, and at this time, if the probe is implanted into the subcutaneous tissue for many times, physical burden and discomfort are imposed on the patient, and the replacement of the probe also increases the cost of blood glucose monitoring. Therefore, how to implant the probe into the subcutaneous tissue quickly and accurately and how to stably position the probe in the subcutaneous tissue becomes a research direction which is urgently needed by all parties.

Disclosure of Invention

An object of the present invention is to provide a real-time dynamic glucose single soft needle sensor in which a probe can be quickly, accurately, smoothly and simply implanted into subcutaneous tissue, reducing the number of times that the probe is displaced or even detached from the subcutaneous tissue during real-time dynamic blood glucose monitoring, reducing the discomfort of the patient and reducing the cost of blood glucose monitoring.

Another object of the present invention is to provide a needle assisting device which can implant the probe of the real-time dynamic glucose single soft needle sensor into the subcutaneous tissue quickly, accurately, stably and simply.

In order to achieve the above object, the solution provided by the present invention is: a real-time dynamic glucose single soft needle sensor comprises an auxiliary needle, a sensing chip, a base and a base frame, wherein the base is used for bearing a detecting head and the sensing chip and is provided with a plurality of bayonets, and the base frame is provided with a plurality of buckles. The base is provided with a detection hole, the detection hole is a through hole, the detection head extends out of the base downwards from the detection hole, the buckle is matched with the shape and the position of the bayonet, the auxiliary needle is provided with an axial tangent plane, and the auxiliary needle penetrates through the detection hole and covers the detection head. When the sensor adopting the solution is used for placing the probe into subcutaneous tissue, the probe can be made of soft materials because the auxiliary needle covers the probe, and when a patient moves to drive muscle to move, the shape of the probe can be properly changed according to the muscle movement, so that the probability of displacement or separation of the probe from the subcutaneous tissue and the discomfort of the patient are reduced, the times of replacing the probe or the base due to the displacement or separation of the probe from the subcutaneous tissue are reduced, and the blood sugar monitoring cost is reduced; because the auxiliary needle has an axial section, the probe head is contacted with the subcutaneous tissue, and when the auxiliary needle is pulled out of the subcutaneous tissue, the probe head has better and more stable fixing effect when penetrating into the subcutaneous tissue; during the use, fix the bed frame to the skin surface earlier, it is fixed with base and bed frame again, the assistance-localization real-time of bed frame makes the location of sensor detecting head more accurate, steady.

Preferably, a rubberized fabric layer can be attached to the lower surface of the base frame, the rubberized fabric layer is preferably made of a medical low-sensitivity rubberized fabric and used for adhering the base frame to the skin of a patient, and the bottom surface of the base frame is adhered to the rubberized fabric more reliably in a chemical fusion mode.

Preferably, the radian of the axial section of the auxiliary needle is 90 degrees to 120 degrees, in this case, the auxiliary effect of the auxiliary needle on the implantation of the probe into subcutaneous tissue is the best, and the probe fixing effect is stable when the needle head is retracted.

Preferably, the sub-needle has an axial section portion with a length greater than the probe length, and the probe length is less than the sub-needle bevel area, thereby reducing the retraction force applied to the probe when the sub-needle is implanted in subcutaneous tissue due to the sub-needle bevel area being free of the probe.

Preferably, the auxiliary needle is installed in the needle shooter, the needle shooter is provided with an elastic supporting leg, the base is provided with a supporting hole matched with the elastic supporting leg, the auxiliary needle is fixed with the base through the needle shooter, and the auxiliary needle is not easy to separate from the probe.

More preferably, the needle injector is provided with an elastic part, the elastic supporting leg is provided with a clamping table, the clamping table controls the elastic part to actuate, the elastic part contracts to drive the auxiliary needle to retreat, the clamping table controls the elastic part to contract to further control the mode of retreating the auxiliary needle, the auxiliary needle retreating speed is high, the retreating angle is stable, and the needle withdrawing is quick and simple.

Preferably, the probe penetrates out of the base to the detection hole, is bent at a right angle and then extends downwards from the detection hole, and when the auxiliary needle drives the probe to be implanted into subcutaneous tissue, the penetrating part of the probe from the base plays a role in blocking the probe from returning.

Preferably, the base and the sensing chip are of a split structure, and once the probe is displaced or separated from subcutaneous tissues, only the probe and the base can be replaced, so that the blood glucose monitoring cost is reduced.

Preferably, the sensor can further comprise a fixing shell, the fixing shell is in threaded connection with the base and fixes the sensing chip and the base, and the capacity of bearing external force impact of the sensor is improved.

Preferably, the base frame is provided with a positioning hole at the front end, the detecting head penetrates through the positioning hole to be implanted into subcutaneous tissue, and the positioning hole can help an installer to accurately position the implantation position of the detecting head of the sensor after the base frame is fixed on the surface of the skin.

In order to achieve another object, the present invention provides a solution: a needle assisting device comprises a shell with a hollow inner part, a pushing core moving axially in the shell and a traction device for actuating the pushing core to move axially. The push core is fixedly connected with the traction device, the traction device is installed on the shell, the inner contour of the shell is matched with the outer contour of the base frame, the sensor is arranged behind the push core of the needle assistor, the needle assistor is arranged on the base frame, the traction device is actuated, and when the stroke of pushing the push core by the traction device is finished, the clamping buckle and the bayonet are clamped, and the auxiliary needle drives the probe head to be implanted into subcutaneous tissue. Because the outline of the base frame is matched with the outline in the shell, the base frame limits the moving range of the shell in the assisting needle process, and a good assisting needle positioning effect is generated.

Preferably, the outer contour of the base frame is egg-shaped and matched with the inner contour of the shell, the smooth mould of the egg-shaped contour is simple to manufacture, and the egg-shaped contour has the size and the direction to form multi-point limiting and directional positioning on the needle assisting device.

Preferably, the traction device comprises a pull rod and an elastic part, the pull rod is fixedly connected with the push core, one end of the elastic part abuts against the push core, when the needle is assisted, the pull rod pulls the push core, the push core extrudes the elastic part, the pull rod is released after the elastic part reaches a fixed position, under the restoring acting force of the elastic part, the pull rod pushes the push core, the push core pushes the base, and the needle is assisted to be inserted into subcutaneous tissues quickly, accurately, stably and simply.

More preferably, the pulling device further comprises a blocking piece and a control piece which are arranged on the shell, the control piece controls the blocking piece to move, the blocking piece blocks the pull rod or the elastic piece to return, and the push core is kept in a ready needle-assisting state, so that the instant process of assisting the needle can be more stable, if the blocking piece is not arranged, the needle-assisting device needs to be finished from the pull rod to the needle-assisting device in one step, the needle-assisting device is often deviated from the original position due to the pulling force of an operator in the pulling process, or the needle-assisting device is not pulled to the position, and the elastic piece does not have enough restoring force to enable the needle. After the blocking piece and the control key are adopted, the pull rod can be pulled to a certain position firstly, then the blocking piece is used for clamping the pull rod, so that the pull rod cannot move up and down, the whole needle assisting device is kept in a state of preparing the needle assisting, then the needle assisting device is aligned to the position needing to be implanted, then the blocking piece is opened through the control piece, the core is pushed to push the sensor under the restoring acting force of the elastic piece, and the auxiliary needle is quickly, accurately, stably and simply inserted into subcutaneous tissue.

Preferably, the push core further comprises a pre-tightening claw, the base is provided with a pre-tightening port matched with the pre-tightening claw, when the push core is pulled to the inside of the shell by the pulling device, the pre-tightening claw is extruded by the shell in the moving process and is clamped with the pre-tightening port, the sensor is reliably fixed on the push core, the needle assisting device stays in any direction, the sensor can keep a fixed state, and the needle assisting process is simpler and more stable.

More preferably, the number of the pre-tightening claws is 3, the pre-tightening claws are uniformly arranged on the outer side of the push core, and when the number of the pre-tightening claws is 3, the sensors are fixed by forces from three directions of one plane, so that the fixing effect is good.

Preferably, the shell further comprises a needle withdrawing structure, the probe is implanted into subcutaneous tissue and then extrudes the needle withdrawing structure, the needle withdrawing structure extrudes the elastic supporting legs, the elastic piece actuates the elastic supporting legs to upwards leave the supporting grooves and then expand towards two sides, the auxiliary needle is separated from the clamping table to limit the auxiliary needle to be separated from the subcutaneous tissue under the restoring action force of the elastic piece, and the auxiliary needle is stably and simply withdrawn from the subcutaneous tissue to the needle shooting shell.

More preferably, the housing further comprises a needle release structure, the needle release structure is pressed after the auxiliary needle is withdrawn from the subcutaneous tissue to the needle ejector housing, the needle release structure releases the fixation of the needle ejector housing, and the needle ejector housing is separated from the needle booster.

The utility model provides a needle assisting device can implant subcutaneous tissue with the detecting head of real-time dynamic glucose single soft needle sensor fast, accurately, steadily, simply to simple, withdraw from subcutaneous tissue with the auxiliary needle fast.

Drawings

FIG. 1 is a front view of a sensor

FIG. 2 is a schematic view of the base of the sensor

FIG. 3 is a schematic view of a base frame of a sensor

FIG. 4 is a schematic view of a needle injector of the sensor

FIG. 5 is a schematic view of the sub-needle of the sensor

FIG. 6 is a cross-sectional view taken along line AA' of FIG. 5

FIG. 7 is a schematic view of the installation of the sub-needle and the probe

FIG. 8 is a front view of the needle assisting device

FIG. 9 is a schematic view of the assembly of the inner part of the needle assisting device

FIG. 10 is a schematic view of FIG. 9 taken along direction B

FIG. 11 is a bottom view of the needle assisting device

Description of the main element symbols:

1 needle assisting device

2 push core

3 draw-off gear

5 needle shooter

6 fixed shell

7 base

8 base frame

11 handle

12 needle-assisting key

13 casing

14 needle releasing key

15 withdraw of the needle key

21 pre-tightening claw

22 release needle fastener 2

23 release the needle and buckle one

24 elastic member III

25 inner contour of housing

221 needle releasing table II

31 elastic member one

32 draw bar

33 Cross bar

34 elastic member four

311 block

321 notch

51 needle releasing table one

52 shooting needle shell

53 elastic member two

54 auxiliary needle stand

55 elastic supporting foot

56 auxiliary needle

57 card table

561 axial section

562 bevel cut zone

71 support hole

72 detection hole

73 probe head

74 bayonet

75 pre-tightening opening

81 positioning hole

82 fastener

83 rubberized fabric layer

α radian of axial tangent plane

Length of section of H-shaped auxiliary needle

Length of vertical part between L-shaped probe and base

Detailed Description

The sensor and the special needle assisting device thereof are further described with the accompanying drawings.

Fig. 1 shows a real-time dynamic glucose single soft needle sensor, which comprises a needle injector 5, a fixed shell 6, a base 7 and a sensing chip (not shown in the figure). The base 7 and the sensing chip (not shown in the figure) are of a split structure, and the fixing shell 6 is in threaded connection with the base 7 and used for fixing the sensing chip. In this embodiment, fixed shell 6 covers behind the sensor chip and base threaded connection, and when pushing away the core and pushing away the sensor, the sensor is more shock-resistant, and the performance is more stable.

As shown in fig. 2, the base 7 has 2

bayonets

74, 1

probe hole

72, and 2 support holes 71, the probe hole 72 is a through hole, and the probe head 73 protrudes downward from the probe hole 72 out of the base 7.

As shown in fig. 3, the base frame 8 has 1

positioning hole

81 and 2 fasteners 82, the fasteners 82 match with the shape and position of the bayonet 74 shown in fig. 2, a layer of rubberized fabric 83 is attached to the lower surface of the base frame 8, and the rubberized fabric is a medical low-sensitivity rubberized fabric for adhering the base frame to the skin of a patient.

In this embodiment, base 7 and bed frame 8 pass through bayonet 74, bayonet 82 fixed connection, and bed frame 8 passes through the rubberized fabric layer 83 and fixes to the skin surface, and during the use, owing to fix bed frame 8 to the skin surface earlier, it is fixed with base 7 and bed frame 8 again, and bed frame 8 plays assistance-localization real-time's effect, and the location of detecting head is more accurate, steady, pastes more reliably.

As shown in fig. 4, the needle shooter 5 comprises a needle shooter shell 52, a second elastic piece 53, an auxiliary needle seat 54, an elastic supporting leg 55 and an auxiliary needle 56, wherein, the auxiliary needle 56 is fixed on the auxiliary needle seat 54 and is arranged in the needle shooting device shell 52, the elastic supporting foot 55 is provided with a clamping platform 57, when the elastic support foot 55 is placed in the support hole 71 of the base 7 shown in fig. 2, the clamping table 57 fixes the auxiliary needle holder 54 and thus positions the auxiliary needle 56, which, in this embodiment, the auxiliary needle is fixed with the base through the needle shooter, the auxiliary needle is not easy to be separated from the probe, the needle shooter 5 is provided with a second elastic part 53, the elastic supporting foot 55 is provided with a clamping table 57, the clamping table 57 controls the second elastic part 53 to move, the second elastic part 53 drives the auxiliary needle 56 to retreat when contracting, the mode that the elastic part contracts and then the auxiliary needle returns is controlled through the clamping table, the auxiliary needle returns fast, the returning angle is stable, and the needle withdrawing is fast and simple.

The root of each elastic support 55 is preferably moulded integrally with the injector housing 52, and the free end opposite to the root is used to lever the flexibility of the elastic support 55, in particular the transverse flexibility of the catch 57, so that it can catch or release the axial movement path of the second elastic element 53, the auxiliary needle seat 54 and the auxiliary needle 56 fixed by it in the injector housing 52. The clamping platform 57 is withdrawn or released from the movement path when the elastic support legs 55 are in an unstressed or free state, and the clamping platform 57 is clamped or blocked in the movement path when the free ends of the elastic support legs 55 are pressed and folded in a double-clamped manner into the support holes 71 of the base 7 shown in fig. 2.

As shown in figures 5 and 6, the auxiliary needle 56 has an axial section 561 and a chamfered section 562, wherein the radian α of the axial section is 120 degrees, so that the auxiliary needle is used for assisting the implantation of the probe into the subcutaneous tissue and the probe is fixed when the needle is retracted, and the combined effect of the two aspects is better.

As shown in figure 7, after the probe head 73 penetrates out of the base to the probe hole, the probe head is bent at a right angle and then extends downwards from the probe hole, the length H of the section of the tangent plane of the auxiliary needle is greater than the length L of the vertical base part of the probe head, and the length of the vertical base part of the probe head is not as long as the inclined cutting area 562 of the auxiliary needle.

As shown in fig. 8, 9 and 10, the needle assistor 1 provided by the present invention comprises a hollow housing 13, a push core 2 axially moving in the housing, and a pulling device 3 actuating the push core to axially move;

the shell 13 comprises a pull handle 11, a cross bar 33, a needle assisting key 12, a needle releasing key 14 and a needle withdrawing key 15;

the traction device 3 comprises a pull rod 32, a first elastic part 31, a stop block 311 and a fourth elastic part 34, the pull handle 11 is fixedly connected with one end of the pull rod 32, the first elastic part 31 is sleeved outside the pull rod 32 and then penetrates through a cross rod 33, the cross rod 33 is fixedly installed on the shell 13 and is in contact with the needle-assisting key 12, the fourth elastic part 34 is installed in the cross rod 33 as a control part, one end of the fourth elastic part is abutted against the needle-assisting key 12, the stop block 311 is arranged at one end of the first elastic part 31, the stop block 311 is abutted against by the fourth elastic part 34 as a stop part, the other end of the first elastic part 31 is abutted against the push core 2, and the other end of the.

The needle assisting process comprises the following steps: the pull rod 32 pulls the push core 2, the push core 2 extrudes the first elastic part 31, the push core 2 is pulled to a fixed position, the stop block 311 is clamped in the notch 321 of the pull rod 32, the push core 2 is positioned at the fixed position to keep a needle assisting state, when the needle assisting is carried out, the needle assisting key 12 is pressed, the needle assisting key 12 abuts against the fourth elastic part 34 serving as a control part, the fourth elastic part 34 abuts against the stop block 311 to move out of the notch 321, under the action of restoring force of the first elastic part 31, the push core 2 pushes the sensor, the auxiliary needle 56 is inserted into subcutaneous tissue, and the whole needle assisting process is simple and rapid.

As shown in fig. 10, 3 and 2, the inner contour 25 of the housing is egg-shaped and fits with the outer contour of the base frame 8, the push core 2 has 3 pre-tightening claws 21, as shown in fig. 1, the base 7 has 3 pre-tightening ports 75, after the sensor is placed on the push core 2 of the needle assistor, the pre-tightening claws 21 are engaged with the pre-tightening ports 75, the sensor is fixed by the needle assistor, at this time, the needle assistor is placed on the base frame 8, the needle assisting process is performed, and when the needle assisting process is finished, the buckle 82 and the bayonet 74 are engaged and the auxiliary needle 56 drives the probe head 73 to implant into subcutaneous tissue. Because the outline of the base frame 8 is matched with the inner outline 25 of the shell, the base frame 8 limits the moving range of the shell 13 in the assisting needle process, a good assisting needle positioning effect is generated, the smooth mould with the egg-shaped outline is simple to manufacture, and the size direction and the direction of the mould form multi-point limiting and direction positioning on the assisting needle device.

As shown in fig. 1, 2 and 4, the auxiliary needle 56 is fixedly mounted on the auxiliary needle seat 54, the auxiliary needle seat 54 is pulled by the second elastic member 53, and the clamping table 57 blocks the auxiliary needle seat 54 from moving due to the elastic supporting leg 55 extending into the supporting hole 71;

as shown in fig. 8, 9, and 10, in the present embodiment, the needle withdrawing structure includes: the auxiliary needle seat 54, the second elastic element 53, the elastic supporting foot 55, the supporting hole 71, the clamping table 57, the third elastic element 24 and the needle withdrawing key 15. The three 24 elastic pieces are fixedly arranged on two sides of the push core 2, one end of each elastic piece 24 is in contact with the elastic supporting leg 55 in the supporting hole 71, after the needle assisting process is finished, the other end of each elastic piece 24 abuts against the front needle withdrawing key and the rear needle withdrawing key 2, at the moment, the needle withdrawing keys 15 are pressed, the needle withdrawing keys 15 extrude the three 24 elastic pieces, the three 24 elastic pieces extrude the elastic supporting legs 55 to be separated from the supporting holes 71, and the auxiliary needles 56 are withdrawn into the needle shooter shell 52 under the restoring force of the three 24 elastic pieces.

As shown in fig. 1, 8, and 9, in the present embodiment, the needle releasing structure includes: a first needle releasing table 51, a second needle releasing table 221, a second needle releasing buckle 22, a first needle releasing buckle 23 and a needle releasing key 14. After the sensor is installed in the push core 2, the first needle releasing table 51 is clamped with the second needle releasing table 221, the needle shooting device shell 52 is contacted with the second needle releasing buckle 22 and the first needle releasing buckle 23, the needle releasing key 14 is contacted with the first needle releasing buckle 23, the first needle releasing buckle 23 is contacted with the second needle releasing buckle 22, the needle releasing key 14 is extruded, the first needle releasing buckle 23 is extruded by the needle releasing key 14, the second needle releasing buckle 22 is extruded by the first needle releasing buckle 23, the second needle releasing table 221 is separated from the clamping state with the first needle releasing table 51, and the needle shooting device 5 is separated from the shell 13.

The needle assisting device adopting the needle withdrawing structure and the needle releasing structure automatically withdraws the auxiliary needle from subcutaneous tissues and withdraws the sharp auxiliary needle into the needle shooter, thereby reducing the possibility of injury of a user and simultaneously enabling the whole needle assisting process to be simpler and quicker.

Although the present invention has been described in terms of embodiments, those of ordinary skill in the art will recognize that there are numerous variations and permutations of the present invention as set forth herein without departing from the spirit and scope of the invention as set forth in the appended claims.

Claims

1. A real-time dynamic glucose single soft needle sensor comprises an auxiliary needle, a sensing chip, a base for bearing a probe head and the sensing chip, and is characterized in that,

the auxiliary needle is provided with an axial tangent plane, and the auxiliary needle penetrates through the detection hole and covers the detection head; the auxiliary needle is installed in the needle shooter, the needle shooter is provided with an elastic supporting leg, the base is provided with a supporting hole matched with the elastic supporting leg, the needle shooter is provided with an elastic piece, the elastic supporting leg is provided with a clamping table, the clamping table controls the elastic piece to act, and the elastic piece contracts to drive the auxiliary needle to retreat.

2. The real-time dynamic glucose single soft needle sensor according to claim 1, wherein a layer of medical hypo-sensitive adhesive tape is attached under the base frame.

3. The real-time dynamic glucose single soft needle sensor as claimed in claim 1, wherein the radian of the axial section of the auxiliary needle is 90 to 120 degrees.

4. The real-time dynamic glucose single soft needle sensor of claim 1, wherein the auxiliary needle has an axial section with a length greater than the probe length, and wherein the probe length is less than the auxiliary needle bevel area.

5. The real-time dynamic glucose single soft needle sensor according to claim 1, wherein the root of the elastic supporting foot is molded with the injector shell into a whole, the free end opposite to the root is used for prying the flexibility of the elastic supporting foot so that the elastic supporting foot can clamp or release the elastic piece, the auxiliary needle seat and the axial movement path of the auxiliary needle fixed by the elastic piece and the auxiliary needle in the injector shell, the clamping table is withdrawn or released from the movement path under the unstressed or free state of the elastic supporting foot, and the clamping table clamps or blocks the movement path when the free end of the elastic supporting foot is pressed and folded by double clamping into the supporting hole.

6. The real-time dynamic glucose single soft needle sensor of claim 5, wherein the free end opposite the root is used to pry the lateral deflection of the chuck.

7. The real-time dynamic glucose single soft needle sensor as recited in claim 1, wherein the probe head extends out of the base to the probe hole, bends at a right angle, and then extends downward from the probe hole.

8. The real-time dynamic glucose single soft needle sensor according to claim 1, wherein the base and the sensing chip are of a split structure.

9. The real-time dynamic glucose single soft needle sensor according to claim 1, further comprising a fixing shell in threaded connection with the base for fixing the sensing chip to the base.

10. The real-time dynamic glucose single soft needle sensor according to claim 1, wherein the front end of the base frame has a positioning hole.

11. A needle assister is characterized by comprising a shell with a hollow interior, a push core which moves axially in the shell and a pulling device which actuates the push core to move axially, wherein the push core is fixedly connected with the pulling device, the pulling device is installed on the shell, the inner contour of the shell is matched with the outer contour of a base frame, the real-time dynamic glucose single soft needle sensor as claimed in any one of claims 1 to 10 is placed behind the push core of the needle assister, the needle assister is placed on the base frame, the pulling device is actuated, and when the stroke of pushing the push core by the pulling device is finished, a buckle and a bayonet are buckled, and the auxiliary needle drives a probe to be implanted into subcutaneous tissue; the housing further includes a needle withdrawing structure.

12. The needle aid of claim 11 wherein the base frame has an egg-shaped outer profile that conforms to the inner profile of the housing.

13. The needle assisting device according to claim 11, wherein the pulling device comprises a pull rod and an elastic member, the pull rod is fixedly connected with the push core, and one end of the elastic member abuts against the push core.

14. The needle aid of claim 13, wherein the device further comprises a blocking member and a control member mounted on the housing, the control member controls the blocking member to move, and the blocking member blocks the pull rod or the elastic member from returning to keep the plunger in a ready state for assisting the needle.

15. The needle assist device according to claim 11, wherein the push core further comprises a pre-tightening claw, and the base has a pre-tightening opening engaged with the pre-tightening claw.

16. The needle assisting device according to claim 15, wherein the number of the pre-tightening claws is 3 respectively and is uniformly arranged outside the push core.

17. The needle assist device of claim 11 wherein the housing further comprises a needle release structure.