CN213249316U

CN213249316U - Suction type biopsy needle

Info

Publication number: CN213249316U
Application number: CN202021849514.1U
Authority: CN
Inventors: 陈友平; 胡伟
Original assignee: Jiangxi Oude Medical Equipment Co ltd
Current assignee: Jiangxi Oude Medical Equipment Co ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-05-25
Anticipated expiration: 2030-08-28

Abstract

The utility model discloses a suction formula biopsy needle belongs to medical instrument technical field, suction formula biopsy needle includes the needle tubing subassembly, the nook closing member, the trigger switch, shell subassembly, the direction nest of tubes, negative pressure pipe fitting and spring part, negative pressure pipe fitting cup joints on the nook closing member, the one end and the shell subassembly looks joint of negative pressure pipe fitting, the spring part cup joints on the negative pressure pipe fitting, the one end of direction nest of tubes cup joints on the spring part, the other end and the nook closing member looks joint of direction nest of tubes, the direction nest of tubes can be followed the inner wall of shell subassembly and is slided. The utility model discloses a suction formula biopsy needle adopts the mechanism that guide tube group, negative pressure pipe fitting and spring part combined together, makes the sample action more steady reliable, and is easy and simple to handle swift, and the tissue of just taking a sample can fully take out from the human body, avoids taking a sample many times, helps medical care operating personnel to carry out accurate quick sample.

Description

Suction type biopsy needle

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a suction formula biopsy needle.

Background

With the development of medical treatment level, in recent years, fine needle aspiration cytology biopsy under ultrasonic guidance is applied more and more in daily medical treatment. The core tool involved is a biopsy needle. A biopsy needle is a medical instrument used for sampling living tissues of pyramidal tumors, unknown tumors, and the like of various organs such as kidney, liver, lung, breast, thyroid, prostate, pancreas, testis, uterus, ovary, body surface, and the like, and sucking cells, and the like.

Chinese patent document publication No. CN209048193U discloses a percutaneous aspiration biopsy needle, including needle tubing and stylet, still include handle operation end, handle operation end include shell body, endotheca, prevent mistake button, back percussion button, left button, right button, the shell body includes upper cover, lower cover, the endotheca is established in the shell body, the endotheca includes endotheca upper cover, endotheca lower cover, the inside endotheca structural plane that still is equipped with of endotheca, movable assembly includes stylet holder, blotter, needle tube seat, front spring, back spring, stylet holder and stylet tail connection, the blotter is connected with stylet holder side opening, back spring cover is in stylet holder afterbody, the stylet holder is connected with the needle tube afterbody, front spring cover is in stylet holder afterbody. The inner cavity of the inner sleeve is divided into a front cavity and a rear cavity by the inner sleeve structural surface, the front cavity can contain the needle tube seat and the front spring, and the rear cavity can contain the needle core seat and the rear spring.

However, when the percutaneous aspiration biopsy needle is used for loading, the right button and the left button need to be pressed respectively to compress the front spring and the rear spring so that the blocking surfaces formed by buckling the buckling structures at the tail parts of the needle core seat and the needle tube seat and the upper cover and the lower cover of the inner sleeve are contacted to complete the loading process, so that the percutaneous aspiration biopsy needle is complex to operate and inconvenient for operators to quickly sample. Meanwhile, the trigger button after being pressed and touched enables the needle core seat or the needle tube seat to move, in the needle group sampling movement process, the movement direction of the needle group is difficult to guarantee to be stable and consistent all the time, the puncture position is prone to deviation or the needle group rotates frequently to cause serious damage of tissue extrusion, when the needle group is pulled out, the divided tissue is difficult to be pulled out from a human body along with the needle tube, the sampling amount is insufficient, and the needle group is not beneficial to medical operators to carry out tissue sampling inspection smoothly.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect of the prior art, the utility model aims to solve the technical problem that a suction type biopsy needle is proposed is provided, adopts the mechanism that guide tube group, negative pressure pipe fitting and spring part combined together, makes the sample action more steady reliable, and is easy and simple to handle swift, and the sample tissue can fully take out from the human body, avoids taking a sample many times, helps medical care operating personnel to carry out accurate quick sample.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a suction type biopsy needle, which comprises a needle tube component, a needle core component, a trigger switch and a shell component, wherein the needle tube component is fixedly connected with the shell component, the trigger switch is clamped on the shell component, the needle core component can sequentially pass through the shell component, the trigger switch and the needle tube component, the suction type biopsy needle further comprises a guide tube group, a negative pressure tube and a spring part, the negative pressure tube is sheathed on the needle core component, one end of the negative pressure tube is clamped with the shell component, the spring part is sheathed on the negative pressure tube, one end of the guide tube group is sheathed on the spring part, the other end of the guide tube group is clamped with the needle core component, the guide tube group can slide along the inner wall of the shell component, the end part of the needle core component is pressed, one end of the guide tube group is clamped with the shell component, the guide tube group is pressed, cut apart in order to realize that the tissue puncture cuts apart, press the trigger switch, make the one end of guide tube group receive the compression deformation after with shell subassembly phase separation, the spring part is reset to stretch this moment, drives the front end of nook closing member subassembly and to the shell subassembly inner chamber retraction, is cut apart the tissue and receives the negative pressure effect of negative pressure pipe fitting and is inhaled in the needle tubing subassembly.

The utility model discloses preferred technical scheme lies in, the pipe group includes pipe fitting and buckle board, pipe fitting and buckle board integrated into one piece, pipe fitting accessible buckle board and shell subassembly looks joint, and the one end of pipe fitting cup joints on the spring part, and the other end and the nook closing member looks joint of pipe fitting, and the pipe fitting can be followed the inner wall of shell subassembly and is done the slip.

The utility model discloses preferably technical scheme lies in, shell subassembly includes shell spare and linking piece, the one end and the needle tubing subassembly looks joint of linking piece, and the other end of linking piece passes trigger switch and shell subassembly and negative pressure pipe spare looks joint in proper order, pipe spare accessible buckle board and shell spare looks joint, and the pipe spare can be followed the inner wall of shell spare and is done the slip, and the needle core subassembly can pass shell spare and linking piece in proper order.

The utility model discloses preferred technical scheme lies in, is equipped with the direction slider on the pipe spare, has seted up the guide rail groove on the inner wall of outer shell spare, and the direction slider can be followed the guide rail groove and done the slip.

The utility model discloses preferred technical scheme lies in, and negative pressure pipe fitting accessible sealing washer closely cooperates with the nook closing member subassembly.

The utility model discloses preferred technical scheme lies in, the nook closing member includes needle chipware and nook closing member, and the one end and the nook closing member looks rigid coupling of needle chipware, the other end of needle chipware pass the needle tubing subassembly, and the sealing washer cup joints on the nook closing member seat.

The utility model discloses preferred technical scheme lies in, needle tubing set includes needle tubing, luer joint and luer tooth lid, and the one end of needle tubing set is fixed in luer joint, luer joint and luer tooth lid threaded connection, luer tooth lid and linking piece looks joint, and luer tooth lid, luer joint and needle tubing set are passed in proper order to the one end of nook closing member.

The utility model discloses preferred technical scheme lies in, sealing washer and the ring seal groove looks joint of seting up on the nook closing member seat.

The utility model discloses preferred technical scheme lies in, is equipped with spacing buckle on the buckle board, and spacing buckle can receive the spring action of spring part and offset with outer shell spare to make buckle board and outer shell spare looks joint.

The utility model discloses preferred technical scheme lies in, luer connects's one end can be dismantled and be connected with the protection tube that is used for protecting the needle group, and needle tubing and nook closing member all penetrate the protection tube.

The utility model has the advantages that:

the utility model provides a suction type biopsy needle, shell subassembly are used for fixing a position the assembly with needle tubing subassembly, nook closing member subassembly and trigger switch, and the nook closing member subassembly is used for puncturing and cutting apart the tissue sample, and the needle tubing subassembly is used for the holding to be the divided tissue sample, and medical care operating personnel can drive the nook closing member and remove through pressing the trigger switch to release in following the needle tubing subassembly with the divided tissue sample, in order to realize taking out the tissue sample from the biopsy needle. Support and guide effect through the guide tube group, the direction guarantees unanimously when can guarantee that the nook closing member carries out biopsy sampling action, it is more steady reliable to move, help medical and medical operating personnel to carry out accurate location biopsy sample position, and adopt spring part and negative pressure pipe fitting matched with structure, medical and medical operating personnel of both being convenient for carries out quick loading and targets in place, and press the trigger switch and can make the spring part reset fast, thereby form the negative pressure in the negative pressure pipe fitting, help adsorbing divided tissue, guarantee that divided tissue can fully take out from the human body, avoid the sample volume not enough and sample many times repeatedly, the sampling process is both simple and convenient reliable, and is high-efficient safety again. Through the process, when the biopsy needle is guaranteed to be subjected to sampling operation, the sampling action is more stable and reliable, the operation is simple, convenient and fast, the sampling tissue can be fully extracted from the human body, multiple sampling is avoided, and the medical operation personnel can be helped to perform accurate and fast sampling.

Drawings

FIG. 1 is a schematic view of the structural assembly of an aspiration biopsy needle provided in an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an aspiration biopsy needle provided in an embodiment of the present invention;

FIG. 3 is an enlarged view of the configuration of the aspiration biopsy needle of portion A of FIG. 2;

fig. 4 is a schematic structural view of a guide tube group provided in an embodiment of the present invention;

FIG. 5 is a schematic structural view of a housing member provided in an embodiment of the present invention;

FIG. 6 is a schematic structural view of a stylet assembly provided in an embodiment of the invention;

fig. 7 is a schematic structural view of a joint member according to an embodiment of the present invention.

In the figure:

1. a needle cannula assembly; 11. a needle tubing member; 12. a luer fitting; 13. a luer cover; 2. a stylet assembly; 21. a needle core member; 22. a needle core seat; 221. an annular seal groove; 3. a trigger switch; 4. a housing assembly; 41. a housing member; 411. a guide rail groove; 42. a joining member; 5. a guide tube group; 51. a conduit member; 511. a guide slider; 52. a buckle plate; 521. a limiting buckle; 6. a negative pressure pipe fitting; 7. a spring member; 8. a seal ring; 9. and (5) protecting the tube.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 7, the aspiration type biopsy needle provided in this embodiment includes a needle tube assembly 1, a needle core assembly 2, a trigger switch 3, and a housing assembly 4, the needle tube assembly 1 is fixedly connected to the housing assembly 4, the trigger switch 3 is clamped on the housing assembly 4, and the needle core assembly 2 can sequentially pass through the housing assembly 4, the trigger switch 3, and the needle tube assembly 1. Wherein, shell subassembly 4 is used for carrying out the positioning assembly with needle tubing subassembly 1, nook closing member subassembly 2 and trigger switch 3, and nook closing member subassembly 2 is used for the puncture and cuts apart the tissue sample, and needle tubing subassembly 1 is used for the holding to be divided the tissue sample, and medical care operating personnel can drive nook closing member subassembly 2 and remove through pressing trigger switch 3. When sampling operation is carried out in order to guarantee the biopsy needle, the sample action is more steady reliable, and is easy and simple to handle swift, and the human body is fully taken out from to the sample tissue, avoids taking a sample many times, helps medical care operating personnel to carry out accurate quick sample. Furthermore, the suction type biopsy needle also comprises a guide tube group 5, a negative pressure tube 6 and a spring part 7, wherein the negative pressure tube 6 is sleeved on the needle core component 2, one end of the negative pressure tube 6 is clamped with the shell component 4, the spring part 7 is sleeved on the negative pressure tube 6, one end of the guide tube group 5 is sleeved on the spring part 7, the other end of the guide tube group 5 is clamped with the needle core component 2, the guide tube group 5 can slide along the inner wall of the shell component 4, the end part of the needle core component 2 is pressed to ensure that one end of the guide tube group 5 is clamped with the shell component 4, at the moment, the spring part 7 is compressed and contracted, the front end of the needle core component 2 can extend out of the needle tube component 1 to realize tissue puncture division, the trigger switch 3 is pressed to ensure that one end of the guide tube group 5 is separated from the shell component 4 after being compressed and deformed, at the moment, the spring part 7 is reset and, the divided tissue is sucked into the needle tube assembly 1 by the negative pressure of the negative pressure tube 6. The specific sampling procedure for the biopsy needle is as follows. First, the end of the stylet assembly 2 is pressed so that one end of the guide tube set 5 snaps into engagement with the housing assembly 4, a "click" is heard to indicate that the stylet assembly 2 is loaded into position, the trigger switch 3 is deactivated and the spring member 7 is compressed. Then, the operation of biopsy is carried out according to relevant regulations, before the percutaneous puncture of the biopsy needle, anesthesia can be properly carried out on the biopsy position, the skin is cut by a scalpel, and the percutaneous puncture process is carried out under the cooperation of an X-ray machine or a B-ultrasonic device, so that the accurate positioning of the biopsy needle is ensured, and the puncture process is safe and effective. The locator may be used to assist in positioning, and the locator may be depth adjusted so that when the locator contacts the skin, the biopsy needle is in the desired position. After inserting biopsy point with nook closing member 2 and needle tubing subassembly 1 simultaneously, nook closing member subassembly 2 passes needle tubing subassembly 1 and punctures and cuts apart human biopsy position, then medical care operating personnel presses trigger switch 3, make the one end pressurized deformation of guide tube group 5 back and shell subassembly 4 phase separation, spring part 7 resets and stretches this moment, the front end that drives nook closing member subassembly 2 is to the quick retraction of shell subassembly 4 inner chamber, make the inner chamber of negative pressure pipe fitting 6 form the negative pressure, at this moment, it receives the negative pressure effect of negative pressure pipe fitting 6 and is inhaled in the needle tubing subassembly 1 to cut apart the tissue. Wherein the entire biopsy needle may be rotated during firing of the sampled tissue, particularly for elastic tissue, to ensure that the tissue is thoroughly segmented for extraction sampling. After the biopsy sampling process is completed, the biopsy needle is slowly withdrawn from the patient, and the biopsy needle is safely placed. Finally, the end of the core assembly 2 is depressed and the sample is pushed out of the channel of the needle assembly 1 as the core assembly 2 is advanced, thereby allowing the sample to be removed from the biopsy needle. Wherein, support and guide effect through guide tube group 5, can guarantee that the direction guarantees unanimously when nook closing member subassembly 2 carries out the biopsy sample action, it is more steady reliable to move, help medical and nursing operating personnel to carry out accurate location biopsy sample position, and adopt

spring part

7 and 6 matched with structures of negative pressure pipe fitting, the medical and nursing operating personnel of both being convenient for carry out quick loading and target in place, and press trigger switch 3 and can make spring part 7 reset fast, thereby form the negative pressure in negative pressure pipe fitting 6, help adsorbing the tissue that is divided, guarantee that the tissue that is divided can fully take out from the human body, avoid the sample volume not enough and sample many times repeatedly, the sampling process is both simple and convenient reliable, and is high-efficient safety again. Through the process, when the biopsy needle is guaranteed to be subjected to sampling operation, the sampling action is more stable and reliable, the operation is simple, convenient and fast, the sampling tissue can be fully extracted from the human body, multiple sampling is avoided, and the medical operation personnel can be helped to perform accurate and fast sampling.

Preferably, the guide tube set 5 includes a tube member 51 and a latch plate 52, the tube member 51 and the latch plate 52 are integrally formed, the tube member 51 can be latched with the housing assembly 4 through the latch plate 52, one end of the tube member 51 is sleeved on the spring member 7, the other end of the tube member 51 is latched with the stylet assembly 2, and the tube member 51 can slide along the inner wall of the housing assembly 4. The pipe guide 51 is used for supporting and guiding the stylet assembly 2, so that the stylet assembly 2 is guaranteed to move more stably and reliably, and the clamping plate 52 is used for enabling the pipe guide 51 to be clamped with the shell assembly 4 in a positioning mode to be loaded in place quickly.

Preferably, the housing assembly 4 comprises a housing member 41 and a connecting member 42, one end of the connecting member 42 is connected with the needle cannula assembly 1 in a clamping manner, the other end of the connecting member 42 passes through the trigger switch 3 in sequence and the housing assembly 4 is connected with the negative pressure pipe member 6 in a clamping manner, the conduit member 51 can be connected with the housing member 41 in a clamping manner through a clamping plate 52, the conduit member 51 can slide along the inner wall of the housing member 41, and the needle core assembly 2 can pass through the housing member 41 and the connecting member 42 in sequence. The shell component 41 is used for positioning and assembling the needle tube component 1, the needle core component 2, the trigger switch 3, the guide tube group 5, the negative pressure tube component 6 and the spring component 7 and plays a role in safety protection, and the connecting component 42 is used for positioning and assembling the needle tube component 1, the trigger switch 3, the shell component 4 and the negative pressure tube component 6, is reliable in positioning and is convenient to disassemble and assemble.

Preferably, the guide rail member 51 is provided with a guide slider 511, the inner wall of the housing member 41 is provided with a guide rail slot 411, and the guide slider 511 can slide along the guide rail slot 411. The guide slide block 511 is matched with the guide rail slot 411, so that the moving direction of the needle core component 2 is ensured to be stable and constant, and the biopsy sampling positioning is ensured to be more accurate and reliable.

Preferably, the negative pressure tube 6 may be tightly fitted to the stylet assembly 2 by a sealing ring 8. Through setting up sealing washer 8, can strengthen the cavity gas tightness of negative pressure pipe fitting 6, guarantee the negative pressure adsorption affinity, make negative pressure pipe fitting 6 utilize the negative pressure effect to adsorb the process of tissue to go on smoothly.

Preferably, the stylet assembly 2 comprises a stylet 21 and a stylet holder 22, one end of the stylet 21 is fixedly connected with the stylet holder 22, the other end of the stylet 21 penetrates through the needle tube assembly 1, and the sealing ring 8 is sleeved on the stylet holder 22. The core member 21 is used for puncturing and sampling tissue, and the core holder 22 is used for positioning and supporting the core member 21, and is convenient for a medical operator to move the core member 21 by holding the core holder 22.

Preferably, the needle cannula assembly 1 comprises a needle cannula 11, a luer connector 12 and a luer cover 13, wherein one end of the needle cannula 11 is fixed in the luer connector 12, the luer connector 12 is in threaded connection with the luer cover 13, the luer cover 13 is in clamping connection with the joint piece 42, and one end of the needle core assembly 2 sequentially passes through the luer cover 13, the luer connector 12 and the needle cannula 11. The needle tube part 11 is used for holding the tissue sample divided by the stylet assembly 2, and is convenient to be matched with the connecting piece 42 in a dismounting manner by arranging the luer joint 12 and the luer tooth cover 13, so that medical care operators can change the needle tube assembly 1 according to requirements, the joint compatibility is good, and the replacement is convenient.

Preferably, the sealing ring 8 is clamped with an annular sealing groove 221 formed on the needle core seat 22. By arranging the annular sealing groove 221, the sealing ring 8 can be conveniently positioned and assembled.

Preferably, the fastening plate 52 is provided with a limiting fastener 521, and the limiting fastener 521 can be pressed against the casing 41 by the elastic force of the spring element 7, so that the fastening plate 52 is fastened to the casing 41. By arranging the limiting buckle 521, reliable positioning can be realized with the shell part 41.

Preferably, a protecting tube 9 for protecting the needle set is detachably connected to one end of the luer 12, and the needle tube 11 and the needle core assembly 2 are inserted into the protecting tube 9. When the biopsy needle is not used, the needle tube 11 and the needle core component 2 can be protected by sleeving the protection tube 9 on the needle tube 11.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.

Claims

1. An aspiration biopsy needle, comprising a needle tube assembly (1), a needle core assembly (2), a trigger switch (3) and a housing assembly (4), wherein the needle tube assembly (1) is fixedly connected with the housing assembly (4), the trigger switch (3) is connected to the housing assembly (4) in a clamping manner, the needle core assembly (2) can sequentially pass through the housing assembly (4), the trigger switch (3) and the needle tube assembly (1), and is characterized in that:

the suction type biopsy needle also comprises a guide tube group (5), a negative pressure tube (6) and a spring piece (7);

the needle core component (2) is sleeved with the negative pressure pipe fitting (6), one end of the negative pressure pipe fitting (6) is clamped with the shell component (4), the spring part (7) is sleeved on the negative pressure pipe fitting (6), one end of the guide pipe group (5) is sleeved on the spring part (7), the other end of the guide pipe group (5) is clamped with the needle core component (2), and the guide pipe group (5) can slide along the inner wall of the shell component (4);

pressing the end part of the stylet assembly (2) to enable one end of the guide tube group (5) to be clamped with the shell assembly (4), wherein the spring piece (7) is compressed and contracted, and the front end of the stylet assembly (2) can extend out of the needle tube assembly (1) to realize tissue puncture segmentation;

pressing the firing switch (3) to enable one end of the guide tube group (5) to be pressed and deformed and then separated from the shell component (4), at the moment, the spring piece (7) resets and stretches to drive the front end of the needle core component (2) to retract towards the inner cavity of the shell component (4), and the divided tissues are sucked into the needle tube component (1) under the action of negative pressure of the negative pressure pipe fitting (6).

2. The aspiration biopsy needle of claim 1, wherein:

the guide pipe group (5) comprises a guide pipe piece (51) and a clamping plate (52);

the pipe guide piece (51) and the clamping plate (52) are integrally formed, and the pipe guide piece (51) can be clamped with the shell component (4) through the clamping plate (52);

one end of the pipe guide piece (51) is sleeved on the spring piece (7), the other end of the pipe guide piece (51) is clamped with the needle core component (2), and the pipe guide piece (51) can slide along the inner wall of the shell component (4).

3. The aspiration biopsy needle of claim 2, wherein:

the housing assembly (4) comprises a housing piece (41) and a joint piece (42);

one end of the connecting piece (42) is clamped with the needle tube assembly (1), and the other end of the connecting piece (42) sequentially penetrates through the trigger switch (3) and the shell assembly (4) to be clamped with the negative pressure pipe fitting (6);

the guide pipe fitting (51) can be clamped with the outer shell member (41) through the clamping plate (52), and the guide pipe fitting (51) can slide along the inner wall of the outer shell member (41);

the stylet assembly (2) may be passed through the housing member (41) and the engagement member (42) in sequence.

4. The aspiration biopsy needle of claim 3, wherein:

the guide pipe piece (51) is provided with a guide sliding block (511), and the inner wall of the outer shell piece (41) is provided with a guide rail groove (411);

the guide sliding block (511) can slide along the guide rail groove (411).

5. The aspiration biopsy needle of claim 1, wherein:

the negative pressure pipe fitting (6) can be tightly matched with the needle core component (2) through a sealing ring (8).

6. The aspiration biopsy needle of claim 5, wherein:

the stylet assembly (2) comprises a stylet piece (21) and a stylet holder (22);

one end of the needle core piece (21) is fixedly connected with the needle core seat (22), and the other end of the needle core piece (21) penetrates through the needle tube assembly (1);

the sealing ring (8) is sleeved on the needle core seat (22).

7. The aspiration biopsy needle of claim 3, wherein:

the needle cannula assembly (1) comprises a needle cannula part (11), a luer connector (12) and a luer cover (13);

one end of the needle tube piece (11) is fixed in the luer connector (12), the luer connector (12) is in threaded connection with the luer cover (13), and the luer cover (13) is clamped with the joint piece (42);

one end of the stylet assembly (2) sequentially penetrates through the luer cover (13), the luer connector (12) and the needle tube piece (11).

8. The aspiration biopsy needle of claim 6, wherein:

the sealing ring (8) is clamped with an annular sealing groove (221) formed in the needle core seat (22).

9. The aspiration biopsy needle of claim 3, wherein:

the buckle plate (52) is provided with a limiting buckle (521);

the limiting buckle (521) can be abutted against the outer shell part (41) under the action of the elastic force of the spring part (7), so that the buckle plate (52) is clamped with the outer shell part (41).

10. The aspiration biopsy needle of claim 7, wherein:

one end of the luer connector (12) is detachably connected with a protection tube (9) used for protecting the needle group;

the needle tube part (11) and the needle core component (2) penetrate into the protection tube (9).