CN215134957U - Electronic injection needle for electronic injection device - Google Patents

Abstract

The utility model relates to the technical field of medical equipment and discloses an electronic injection needle for an electronic injection device, which comprises a needle sleeve, a needle main body and an elastic ring; the needle sleeve is internally provided with a partition board which divides the needle sleeve into a first accommodating cavity and a second accommodating cavity; the elastic ring is arranged on the needle head main body, and the upper end of the needle head main body and the elastic ring are positioned in the first accommodating cavity; the lower end of the needle body penetrates through the elastic ring and the partition plate and extends to the interior of the second accommodating cavity. This electron injection needle for injection device, divide into first chamber and the second that holds through the baffle with the needle cover and hold the chamber, base member and elastic ring are located first intracavity that holds, and the needle tubing of being connected with the base member passes the elastic ring and extends to the second and hold the intracavity, and the elastic ring is pushed down when making the base member move down in the needle cover, and the needle tubing stretches out the needle cover, pricks the needle, and in the needle cover was got back to again to the needle tubing under the effect of elastic ring after pricking the needle, realized the mesh of protractile back extension needle.

Description

Electronic injection needle for electronic injection device

Technical Field

The utility model relates to the technical field of medical equipment, specifically be an electron syringe needle for electron injection device.

Background

The currently commonly used water light injection needle head injects high-end injection products such as hyaluronic acid, collagen, botulinum toxin, PRP autologous cells and the like which are lost due to aging into the dermis layer of the skin by utilizing the negative pressure principle, so that sufficient water is absorbed and stored in the skin to awaken the cell regeneration function, cells which are withered and broken by the skin are restored again, and the skin is reshaped to be compact, smooth and elastic in a short period.

The Chinese application CN 111420182A discloses a nine-hole negative pressure injection needle, a nine-needle luer connector is in threaded connection with a nine-needle turntable, the end part of the nine-needle separation blade is connected with a nine-needle base and is fixed by glue, the nine-needle base is connected with nine needle tubes, a through connecting hole II in the nine-needle luer connector is communicated with the inside of the needle tubes, the boss step parts of the nine-needle base with the needle tubes, the nine-needle separation blade and the nine-needle luer connector which are connected into a whole are arranged in a nine-needle shell and can slide axially, the nine-needle turntable is in snap-fit connection with the nine-needle shell, and the nine-needle turntable can rotate around the step of the nine-needle shell; when the nine-needle turntable rotates in one direction, the nine-needle luer connector is driven to move forwards and axially, so that the nine needle tubes are synchronously exposed out of the outer end of the six conical columns of the nine-needle housing, when the nine-needle turntable rotates in the reverse direction, the nine needle tubes retract into the needle outlet holes of the six conical columns at the same time, the skin can be compacted by negative pressure and move upwards, so that the needle points of the needle tubes enter the skin, the nine needles can simultaneously feed medicine during injection, the injection time is shortened, and the uniform surface coverage type injection is facilitated.

However, during negative pressure injection, the needle head needs to be matched with an injection hand tool, the needle outlet needs to be manually rotated, so that the needle tube can be used for needle outlet, and the length and the precision of the needle inlet and outlet are difficult to guarantee due to the fact that the needle inlet and outlet are manually rotated.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model provides a not enough to prior art, the utility model provides an electron injection syringe needle for electron injection device possesses advantages such as telescopic business turn over needle, has solved among the prior art length and the precision that the needle caused the business turn over needle of cooperation injection hand utensil and has all been difficult to the problem of guaranteeing.

(II) technical scheme

In order to realize the purpose of the telescopic in-out needle, the utility model provides a following technical scheme:

an electronic injection needle for an electronic injection device comprises a needle sleeve, a needle body and an elastic ring;

the needle sleeve is internally provided with a partition board which divides the needle sleeve into a first accommodating cavity and a second accommodating cavity;

the elastic ring is arranged on the needle head main body, and the upper end of the needle head main body and the elastic ring are positioned in the first accommodating cavity; the lower end of the needle head main body penetrates through the elastic ring and the partition plate and extends into the second accommodating cavity; when the needle body moves in the needle sleeve, the elastic ring is compressed by the needle sleeve, and the lower end of the needle body extends out of the needle sleeve.

Preferably, the needle head main body comprises a base body, the upper end of the base body is provided with an injector connecting pipe connected with an injector, and the lower end of the base body is fixedly connected with a plurality of needle tubes distributed in an array; and a flow guide channel for communicating the injector connecting pipe with the needle tube is also arranged in the base body.

Preferably, the number of the needle tubes is nine.

Preferably, the elastic ring is positioned on the outer side of the needle tube, and the elastic ring is fixedly or movably connected with the lower end of the base body.

Preferably, the elastic ring is made of a non-toxic elastic material.

Preferably, the elastic ring is made of silica gel.

Preferably, the partition plate is provided with a conical tube communicating the first accommodating cavity and the second accommodating cavity, and the needle tip of the needle tube penetrates through the first accommodating cavity and is positioned in the conical tube.

Preferably, the resilient ring is compressed a maximum distance equal to the maximum distance that the needle tip of the needle cannula protrudes out of the conical tube.

Preferably, the needle sleeve is further provided with a negative pressure connecting pipe communicated with the first accommodating cavity and used for being connected with an external pipeline generating negative pressure.

Preferably, the needle sleeve is further provided with a guide groove, a guide pin is arranged inside the guide groove, the base body is further provided with a pin hole matched with the guide pin, and the guide pin penetrates through the guide groove and is inserted into the pin hole; when the base body moves inside the needle sleeve, the guide pin also follows the movement thereof and the guide pin slides inside the guide groove.

(III) advantageous effects

Compared with the prior art, the utility model provides an electron syringe needle for electron injection device possesses following beneficial effect:

1. this electron injection needle for injection device, divide into first chamber and the second that holds through the baffle with the needle cover and hold the chamber, base member and elastic ring are located first intracavity that holds, and the needle tubing of being connected with the base member passes the elastic ring and extends to the second and hold the intracavity, and the elastic ring is pushed down when making the base member move down in the needle cover, and the needle tubing stretches out the needle cover, pricks the needle, and in the needle cover was got back to again to the needle tubing under the effect of elastic ring after pricking the needle, realized the mesh of protractile back extension needle.

2. According to the electronic injection needle for the electronic injection device, the conical tube is arranged, so that the needle tube is positioned in the conical tube when not used, the human body is prevented from being hurt when not used, and the safety is enhanced.

3. This electron injection needle for device uses through the cooperation of the pinhole of guide way and uide pin and the base member that sets up on the needle cover, and the base member is when needle cover inside removes, and the uide pin also follows its removal to the uide pin slides in the inside of guide way, and the syringe needle main part of not squinting when guaranteeing the base member to remove, and make needle cover and base member can dismantle, conveniently change different quantity needle tubing.

Drawings

FIG. 1 is a schematic view of the overall structure of a dual motor propelled subcutaneous electronic injection device;

FIG. 2 is a schematic cross-sectional view of a dual motor-propelled subcutaneous electronic injection device;

FIG. 3 is another schematic structural view of a dual motor propelled subcutaneous electronic injection device;

FIG. 4 is a schematic view of the overall structure of the electronic needle;

FIG. 5 is a schematic cross-sectional view of an electronic needle;

FIG. 6 is a schematic view of the structure of the needle body;

fig. 7 is a schematic structural view of the elastic ring.

In the figure: the device comprises a handle shell 1, a handheld part 101, a display screen 102, an operation button 103, a trachea accommodating hole 104, a second servo motor 2, a second screw rod 3, a connecting block 4, a fixing rod 5, a first servo motor 6, a first screw rod 7, a push block 8, a moving frame 9, a placing frame 10, a first accommodating groove 11, a second accommodating groove 12, an adjusting screw 13, a clamping block 14, a needle sleeve 15, a base 16, a syringe connecting pipe 17, a flow guide channel 18, a needle tube 19, an elastic ring 20, a first accommodating cavity 21, a second accommodating cavity 22, a partition plate 23, a conical tube 24, a negative pressure connecting pipe 25, a pin hole 26, a guide pin 27, a guide groove 28 and a guide strip 29.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, in order to accurately control the penetration depth of a needle, a double-motor propelled subcutaneous electronic injection device is provided, which comprises a handle shell 1, wherein a second linear guide rail mechanism and a first linear guide rail mechanism which are in linkage fit are arranged on the handle shell 1, a placing frame 10 is arranged on one side of the first linear guide rail mechanism, the placing frame 10 is used for placing an injector provided with the needle, and the first linear guide rail mechanism is used for pushing a push rod of the injector to control the injection amount of the injector; the other side of the first linear guide rail mechanism is provided with a connecting structure, the moving end of the second linear guide rail mechanism is connected with the first linear guide rail mechanism through the connecting structure, and the second linear guide rail mechanism is used for pushing the first linear guide rail mechanism and the placing rack 10 to integrally move so as to control the pricking depth of the needle head on the placing rack 10.

The first linear guide rail mechanism comprises a horizontal moving frame 9, one end of the moving frame 9 is fixedly connected with a first servo motor 6, an output shaft of the first servo motor 6 is fixedly connected with a first screw rod 7, a push block 8 matched with the first screw rod 7 is arranged on the first screw rod 7, two sides of the upper part of the push block 8 are in sliding connection with the upper surface of the moving frame 9, and a guiding effect is achieved to a certain degree; the first servo motor 6 drives the first screw rod 7 to rotate, and the first screw rod 7 rotates due to the fixed position of the first servo motor 6, so that the push block 8 matched with the first screw rod 7 moves.

The other end of the moving frame 9 is fixedly connected with a placing frame 10 coaxially arranged with the first lead screw 7, the moving frame 9 and the placing frame 10 are movably connected with the handle shell 1 and can move back and forth under the action of the second linear guide rail mechanism, a first accommodating groove 11 for accommodating a syringe needle cylinder is arranged at one end of the placing frame 10 connected with the moving frame 9, the center of the first accommodating groove 11 and the center of the push block 8 are positioned on the same axis, and the first accommodating groove and the center of the push block 8 are used for ensuring that the push block 8 can contact with a push rod of the syringe to push the push rod of the syringe so as to control the injection amount; a second accommodating groove 12 coaxial with the first accommodating groove 11 is formed in the other end of the placing frame 10, and the second accommodating groove 12 is matched with the needle head and used for placing the needle head;

furthermore, in order to adapt to syringes of different models, the first accommodating groove at one end of the placing frame 10 connected with the moving frame 9 is changed into an adjustable fixing device, the fixing device comprises clamping blocks 14 positioned at the front side and the rear side of the placing frame 10, adjusting screws 13 are arranged on the clamping blocks 14, the adjusting screws 13 penetrate through the clamping blocks 14 to be in threaded connection with the placing frame 10, and when a syringe of a smaller model is to be placed, the adjusting screws 13 are rotated to reduce the distance between the two clamping blocks 14, so that the syringe of the syringe is fixed; conversely, the adjusting screw 13 is rotated to increase the distance between the two clamping blocks 14, so that the device is suitable for large-size syringe syringes.

When the injection amount is controlled (the push rod displacement of the injector is controlled), the needle head is placed in the second accommodating groove 12 on the placing frame 10, then the injector and the needle head are connected and placed on the fixing device, the adjusting screw 13 is adjusted, and the two clamping blocks 14 are clamped tightly; then the first servo motor 6 drives the push block 8 to push the push rod of the injector, the first servo motor 6 (the servo motor can make the control speed and the position precision very accurate, and can convert the voltage signal into the torque and the rotating speed to drive the control object, or the screw rod driving mode in the document mentioned in the background art) is used to control the rotating circle number of the first screw rod 7, and the rotating circle number is converted into the linear displacement of the push block 8, so as to control the push block 8 to push the linear displacement of the push rod of the injector, and the movement of the push rod can push the injection of the liquid medicine in the injector, thereby achieving the purpose of accurately controlling the amount of the injected liquid medicine.

The specific process is as follows: the injection amount can be obtained by multiplying the pushing distance of the pushing block 8 by the cross-sectional area of the accommodating space of the syringe barrel, and the injection amount is reflected by the displacement of the pushing block 8.

The second linear guide rail mechanism comprises a second servo motor 2 fixedly connected to the handle shell 1, an output shaft of the second servo motor 2 and an output shaft of the first servo motor 6 are arranged in a reverse direction, the output shaft of the second servo motor 2 is fixedly connected with a second screw rod 3, and an upper thread of the second screw rod 3 is connected with a horizontally moving connecting block 4 in a matching manner; the second servo motor 2 is fixed on the handle shell 1 and is connected to the upper part of the first servo motor 6 in a sliding way; the lower end of the connecting block 4 is provided with a connecting structure fixedly connected with the first servo motor 6, the connecting structure is a fixed rod 5, and the second servo motor 2 drives the first servo motor 6 to horizontally move through the connecting block 4 and the fixed rod 5;

when the penetration depth of the needle head is controlled (the displacement distance of the whole first linear guide rail mechanism), the first servo motor 6 does not work; the second servo motor 2 drives the second screw rod 3 to rotate, and the second servo motor 2 drives the second screw rod 3 to rotate due to the fixed position of the second servo motor 2, so that the connecting block 4 moves towards the second servo motor 2, and further drives the first servo motor 6 fixedly connected with the connecting block 4 to move; when the first servo motor 6 moves, the needle head on the first linear guide rail mechanism also moves along with the first linear guide rail mechanism; and utilize second servo motor 2 control second lead screw 3 pivoted number of turns, change into the linear displacement of connecting block 4, the linear displacement of connecting block 4 then is the linear displacement of rack 10, and the linear displacement of rack 10 is the linear displacement of syringe needle, and then reaches the purpose of the degree of depth that the control syringe needle pricked skin, does not need the manual work to prick the needle by virtue of experience, has reduced the degree of difficulty of using.

Furthermore, a guide structure is arranged between the first servo motor 6 and the second servo motor 2, the guide structure is a guide strip 29 and a linear groove matched with the guide strip 29, the guide strip 29 and the linear groove are respectively arranged on the first servo motor 6 and the second servo motor 2, and deviation occurs when the first linear guide rail mechanism moves.

Further, the handle housing 1 is also provided with a display screen 102 and an operation button 103, the display screen 102 and the operation button 103 are both electrically connected with the second servo motor 2 and the first servo motor 6, so as to display and control the on-off and displacement of the propulsion of the second servo motor 2 and the first servo motor 6 (obtained by multiplying the rotation speed of the second servo motor 2 and the first servo motor 6 and the rotation speed of the second screw rod 3 and the first screw rod 7 which are respectively connected with the second servo motor 2 and the first servo motor 6 by time); the handle shell 1 is provided with the hand-held part 101, so that the handle shell is convenient for people to hold and use;

still be equipped with trachea accommodation hole 104 on handle shell 1 for place the trachea, trachea and syringe needle are connected, are used for producing the negative pressure to the syringe needle, set up the trachea in handle shell 1, accomodate, avoid the trachea to expose outside, lead to using inconveniently.

Referring to fig. 4-7, in order to match the subcutaneous electronic injection device, the conventional needle head which is manually rotated to adjust the needle insertion depth cannot meet the use requirement, so a new needle head structure is proposed for use, and the specific structure is as follows:

an electronic injection needle for an electronic injection device comprises a needle sleeve 15, a needle body and an elastic ring 20, wherein the needle body comprises a base body 16, an injector connecting pipe 17 connected with an injector is arranged at the upper end of the base body 16, a plurality of needle tubes 19 distributed in an array are fixedly connected at the lower end of the base body 16, and the number of the needle tubes 19 can be nine; the base body 16 is also provided with a flow guide channel 18 which is communicated with the injector connecting pipe 17 and the needle tubes 19, and the flow guide channel 18 uniformly guides the medicine liquid sent by the injector connecting pipe 17 to be sent into each needle tube 19.

The outer side of the needle body is provided with an elastic ring 20, the elastic ring 20 is located on the outer side of the needle tubes 19 distributed in an array, the elastic ring 20 can be fixedly connected with the lower end of the base body 16, or can be separately arranged without being connected and is sleeved on the outer side of the needle tubes 19, and the elastic ring 20 is made of a non-toxic elastic material, preferably silica gel.

The upper end of the needle body and the elastic ring 20 are positioned inside the first containing cavity 21, and the lower end of the needle body passes through the partition plate 23 and the elastic ring 20 and extends to the inside of the second containing cavity 22; the concrete structure is as follows:

a partition plate 23 is arranged in the needle sleeve 15, the partition plate 23 divides the needle sleeve 15 into a first accommodating cavity 21 and a second accommodating cavity 22, a conical pipe 24 communicating the first accommodating cavity 21 with the second accommodating cavity 22 is arranged on the partition plate 23, and the lower end of the conical pipe 24 extends into the second accommodating cavity 22; when the needle body moves within the sleeve 15, the resilient ring 20 is compressed by the sleeve 15 and the lower end of the needle body protrudes out of the sleeve 15; the base body 16 and the elastic ring 20 are positioned in the first accommodating cavity 21 and can move up and down; the needle point of the needle tube 19 penetrates through the first accommodating cavity 21 and is located in the conical tube 24, the conical tube 24 is vertically arranged, the needle tube 19 has guiding and protecting effects, the needle tube 19 is prevented from being deviated and bent in the process that the needle tube 19 is too long and enters the skin, and the size and the number of the conical tube 24 are matched with those of the needle tube 19.

Furthermore, the maximum distance of the elastic ring 20 compressed is equal to the maximum distance of the needle tip of the needle tube 19 extending out of the conical tube 24, so as to ensure that the needle tip is positioned in the conical tube 24 when not in use, and does not hurt the human body, thereby playing a role in protection.

The needle sleeve 15 is provided with a negative pressure connecting pipe 25 communicated with the first accommodating cavity 21 and used for being connected with an external pipeline generating negative pressure, so that negative pressure is formed in the first accommodating cavity 21 and the second accommodating cavity 22, the skin is compacted and moves upwards due to the negative pressure, the needle point of the needle tube 19 enters the skin, and the skin is in a tight state at the moment, and pain is reduced.

When the needle is used, the needle sleeve 15 is firstly attached to the skin of a human body, then the negative pressure connecting pipe 25 is utilized to suck and attach the skin under negative pressure, then the needle body is pressed downwards, the elastic ring 20 is pressed downwards by the needle body, the needle point of the needle tube 19 extends out of the conical tube 24, and then the skin enters the inside of the skin which is sucked and attached under negative pressure; after the injection is completed, the resilience of the resilient ring 20 retracts the needle body to the initial position.

Furthermore, the length of the conical tube 24 is not greater than the depth of the second accommodating cavity 22, so that the needle sheath 15 is more attached to the skin, and the situation that the attachment area of the needle sheath 15 and the skin is small due to the overlong conical tube 24 and the needle tip of the needle tube 19 cannot enter the skin is avoided.

Furthermore, the needle sleeve 15 is also provided with a guide groove 28, a guide pin 27 is arranged inside the guide groove 28, the base body 16 is provided with a pin hole 26 matched with the guide pin 27, the guide pin 27 passes through the guide groove 28 and is inserted into the pin hole 26, when the base body 16 moves inside the needle sleeve 15, the guide pin 27 also moves along with the base body, and the guide pin 27 slides inside the guide groove 28, so that the base body 16 is ensured not to generate deflection in the moving process, the length of the guide groove 28 is equal to the maximum distance of the compression of the elastic ring 20, the guide pin 27 can limit the moving range of the base body 16 in the needle sleeve 15, and meanwhile, the base body 16 is prevented from falling from the inside of the needle sleeve 15; meanwhile, when the base body 16 needs to be disassembled, the guide pin 27 is pulled out, and the needle bodies with different numbers of needle tubes 19 are convenient to install and replace.

When in use:

(1) firstly, placing the electronic injection needle head in a second accommodating groove 12 on a placing rack 10, then connecting the injector and the needle head, placing the injector and the needle head on a fixing device, then rotating an adjusting screw 13 to clamp the injector, holding the handheld part 101 by a hand, and aligning the electronic injection needle head to a position to be pricked; then connecting the negative pressure connecting pipe 25 with the electronic syringe needle to a negative pressure pipe, and carrying out negative pressure suction on the skin; then the second servo motor 2 drives the second screw rod 3 to rotate so as to drive the connecting block 4 to move, the connecting block 4 enables the first servo motor 6 to move, finally the needle head main body in the electronic injection needle head moves and compresses the elastic ring 20, and finally the needle point of the needle tube 19 protrudes out of the conical tube 24 and gradually enters the skin to reach the specified depth.

(2) Then the first servo motor 6 starts to rotate, drives the push block 8 to push the push rod of the injector to perform linear displacement, and the movement of the push rod sends the liquid medicine in the injector into the needle tube 19 of the electronic injection needle, so as to perform injection.

(3) After the injection is completed, the second servo motor 2 drives the first micro linear guide rail mechanism to return to the initial position, and the elastic ring 20 of the electronic injection needle rebounds to send the needle tube 19 into the conical tube 24 again.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. An electronic syringe needle for an electronic injection device, characterized in that: comprises a needle sleeve (15), a needle body and an elastic ring (20);

a partition plate (23) is arranged in the needle sleeve (15), and the needle sleeve is divided into a first accommodating cavity (21) and a second accommodating cavity (22) by the partition plate (23);

the elastic ring (20) is arranged on the needle body, and the upper end of the needle body and the elastic ring (20) are positioned in the first accommodating cavity (21); the lower end of the needle body passes through the elastic ring (20) and the partition plate (23) and extends to the inside of the second accommodating cavity (22); when the needle body moves within the sleeve (15), the resilient ring (20) is compressed by the sleeve (15) and the lower end of the needle body protrudes out of the sleeve (15).

2. An electronic needle for an electronic injection device as defined in claim 1, wherein: the needle head main body comprises a base body (16), an injector connecting pipe (17) connected with an injector is arranged at the upper end of the base body (16), and a plurality of needle tubes (19) distributed in an array are fixedly connected at the lower end of the base body (16); a flow guide channel (18) for communicating the injector connecting pipe (17) and the needle tube (19) is also arranged in the base body (16).

3. An electronic needle for an electronic injection device according to claim 2, wherein: the number of the needle tubes (19) is nine.

4. An electronic needle for an electronic injection device according to claim 2, wherein: the elastic ring (20) is positioned on the outer side of the needle tube (19), and the elastic ring (20) is fixedly or movably connected with the lower end of the base body (16).

5. An electronic needle for an electronic injection device according to claim 4, wherein: the elastic ring (20) is made of a non-toxic elastic material.

6. An electronic needle for an electronic injection device according to claim 5, wherein: the elastic ring (20) is made of silica gel.

7. An electronic needle for an electronic injection device according to claim 2, wherein: the partition plate (23) is provided with a conical tube (24) communicated with the first accommodating cavity (21) and the second accommodating cavity (22), and the needle point of the needle tube (19) penetrates through the first accommodating cavity (21) and is located in the conical tube (24).

8. An electronic needle for an electronic injection device according to claim 7, wherein: the maximum distance that the elastic ring (20) is compressed is equal to the maximum distance that the needle tip of the needle tube (19) protrudes out of the conical tube (24).

9. An electronic needle for an electronic injection device according to claim 2, wherein: the needle sleeve (15) is also provided with a negative pressure connecting pipe (25) communicated with the first containing cavity (21) and used for being connected with an external pipeline generating negative pressure.

10. An electronic needle for an electronic injection device according to claim 2, wherein: the needle sleeve (15) is further provided with a guide groove (28), a guide pin (27) is arranged inside the guide groove (28), the base body (16) is further provided with a pin hole (26) matched with the guide pin (27), and the guide pin (27) penetrates through the guide groove (28) and is inserted into the pin hole (26); when the base body (16) moves inside the needle sleeve (15), the guide pin (27) also moves along with it, and the guide pin (27) slides inside the guide groove (28).

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