CN218684624U

CN218684624U - Locking trocar

Info

Publication number: CN218684624U
Application number: CN202222408454.5U
Authority: CN
Inventors: 刘文菁; 李明; 朱小伟
Original assignee: Suzhou Meichuang Medical Technology Co ltd
Current assignee: Suzhou Meichuang Medical Technology Co ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2023-03-24
Anticipated expiration: 2032-09-09

Abstract

The utility model relates to a locking trocar, which comprises an outer casing seat, a hollow sleeve and two openings arranged at both ends; the needle core tube seat is arranged in a hollow mode, an opening is formed in one end of the needle core tube seat facing the outer sleeve tube seat, the needle core tube seat moves towards the outer sleeve tube seat until a needle core extends into the outer sleeve tube seat, and the outer sleeve tube seat extends into the needle core tube seat towards one end of the needle core tube seat; the outer sleeve seat is provided with first wavy grains along the length direction, the inner wall of the stylet tube seat is provided with a fixture block, the fixture block has elasticity, and when the outer sleeve seat is positioned in the stylet tube seat, the fixture block slides on the first wavy grains; chucking spare is suitable for and conflicts or breaks away from with the fixture block, and the position of restriction fixture block when conflicting with the fixture block makes the fixture block chucking on first raised grain, and the restriction fixture block slides on first raised grain, the utility model discloses have and take off the nook closing member after making things convenient for the puncture, reduced the time of taking off the nook closing member, reduced the operating time's of operation effect.

Description

Locking type trocar

Technical Field

The utility model relates to a technical field of interventional medical instrument, concretely relates to locking type trocar.

Background

The coaxial sleeve needle seat is a puncture tool commonly used in medicine, and mainly establishes a passage between the outside and a pathological change tissue by puncturing the pathological change tissue in a human body, and the pathological change tissue can be subjected to puncture biopsy and radiofrequency ablation treatment through the passage.

The casing needle seat in the prior art normally comprises a needle core and an outer casing seat, the outer casing seat is hollow, the needle core is coaxially arranged at one end of the outer casing seat and extends into the outer casing seat and moves circumferentially in the outer casing seat until the needle core extends out from the other end of the outer casing seat and punctures in a human body, but the length distance of the needle core extending out of the outer casing seat is uncontrollable, the needle core is not fixed during puncturing, the condition of needle back can be caused, a needle core tube seat can be arranged at one end of the needle core outside the human body at the moment, the needle core is fixed on the needle core tube seat, the needle core tube seat gradually moves in the outer casing seat along with the needle core, and therefore the needle core moves towards the direction of the outer casing seat, threads are arranged on the inner wall of the needle core tube seat and the side wall of the outer casing seat facing one end of the needle core tube seat, the needle core tube seat is sleeved on the end of the outer casing seat and is in threaded connection with the outer casing seat, the needle core tube seat moves towards the other end of the outer casing seat, the needle core tube seat moves, and the needle core can not be punctured, and the needle core can not be influenced when the needle core moves.

However, in the actual use process, after the stylet extends out of the outer cannula base to puncture, the stylet base and the outer cannula base are required to be separated, so that the injector can conveniently check whether the puncture is completed on the outer cannula base, the stylet base is required to be taken down from the outer cannula base at the moment, the stylet base is required to be taken down by continuously rotating the stylet base again, the time is spent, and the operation time of the operation is prolonged.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model discloses solve and take off the technical problem that the time spent is long for the nook closing member, extension operation time to a locking type trocar is provided.

A locking trocar, comprising:

the outer sleeve seat is arranged in a hollow mode, and openings are formed in the two ends of the outer sleeve seat;

the needle core tube seat is arranged in a hollow mode, an opening is formed in one end of the needle core tube seat facing the outer sleeve tube seat, one end of the needle core is located in the needle core tube seat, the other end of the needle core extends out of the needle core tube seat, the needle core tube seat moves towards the outer sleeve tube seat until the needle core extends into the outer sleeve tube seat, and the outer sleeve tube seat extends into the needle core tube seat towards one end of the needle core tube seat;

the outer sleeve seat is provided with first wavy grains along the length direction, the inner wall of the stylet tube seat is provided with a fixture block, the fixture block has elasticity, and when the outer sleeve seat is positioned in the stylet tube seat, the fixture block slides on the first wavy grains;

the clamping piece is suitable for abutting against or separating from the clamping block, and limits the position of the clamping block when abutting against the clamping block, so that the clamping block is clamped on the first wavy veins, and the sliding of the clamping block on the first wavy veins is limited.

Furthermore, the clamping piece comprises a clamping tube seat sleeved on the outer sleeve seat, the clamping tube seat rotates on the outer sleeve seat along the axis, a gap is reserved between the outer sleeve seat and the clamping tube seat, and the stylet tube seat extends into the space between the outer sleeve seat and the clamping tube seat;

the inner wall of the outer sleeve seat is provided with a propping block, when the outer sleeve seat rotates to the propping block and the clamping block is abutted, the clamping block is limited between the propping block and the first raised grains, and the clamping block is limited to slide on the first raised grains.

Furthermore, first standing groove has been seted up along its length direction to the outer sleeve pipe seat, first standing groove extends and runs through outer sleeve pipe seat wall towards the stylet mandrel seat direction, first raised grain is located in the first standing groove.

Further, still be provided with the sliding block on the chucking tube socket inner wall, the sliding block has elasticity, leave the space between sliding block and the chucking tube socket inner wall, the nook closing member pipe is provided with round second raised grain along its circumference, works as when the nook closing member pipe seat stretches into between outer casing seat and the chucking tube socket, the sliding block slides along its length direction on the second raised grain.

Furthermore, the inner wall of the clamping tube seat is provided with a second placing groove at the position of the sliding block, the sliding block is positioned at the position of a notch of the second placing groove, one end of the sliding block is connected with the inner wall of the second placing groove, and the surface of the other end of the sliding block protrudes out of the second placing groove.

Further, the method also comprises the following steps:

the supporting tube is arranged at one end, back to the stylet tube seat, of the outer sleeve seat and is coaxially arranged with the outer sleeve seat, and one end of the supporting tube is communicated with the outer sleeve seat.

Furthermore, the needle core support device also comprises a support tube seat, wherein the support tube seat is arranged at one end of the outer sleeve tube seat, which is back to the needle core tube seat, and the support tube is arranged in the support tube seat.

Furthermore, one end of the outer sleeve base, which faces the stylet base, is provided with an injector connecting section, the injector connecting section and the outer sleeve base are coaxially arranged, the injector connecting section is communicated with the outer sleeve base, and the injector connecting section is suitable for being connected with an external injector.

Further, the needle core and the supporting tube are both made of metal materials.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a locking type trocar, which comprises an outer casing seat, a hollow sleeve and a locking sleeve, wherein both ends of the hollow sleeve are provided with openings; the needle core tube seat is arranged in a hollow mode, an opening is formed in one end of the needle core tube seat facing the outer sleeve tube seat, one end of the needle core is located in the needle core tube seat, the other end of the needle core extends out of the needle core tube seat, the needle core tube seat moves towards the outer sleeve tube seat until the needle core extends into the outer sleeve tube seat, and the outer sleeve tube seat extends into the needle core tube seat towards one end of the needle core tube seat; the outer sleeve seat is provided with first wavy grains along the length direction, the inner wall of the stylet tube seat is provided with a fixture block, the fixture block has elasticity, and when the outer sleeve seat is positioned in the stylet tube seat, the fixture block slides on the first wavy grains; the clamping piece is suitable for abutting against or separating from the clamping block, when the clamping piece abuts against the clamping block, the position of the clamping block is limited, the clamping block is clamped on the first raised grain, the clamping block is limited to slide on the first raised grain, before puncture, the needle core firstly extends into the outer sleeve seat from one end of the needle core back to the needle core seat, then the needle core seat is moved, the needle core moves towards the other end in the needle core seat until the needle core seat moves to the outer sleeve seat, the outer sleeve seat extends into the needle core seat, the clamping block on the inner wall of the outer sleeve seat is positioned on the first raised grain on the outer sleeve seat, the elastic clamping block slides on the first raised grain until the outer sleeve seat and the inner wall of the needle core seat abut against, just in time, the tip of the needle core extends out of the supporting tube on the outer sleeve seat, then the clamping piece is moved, and the clamping piece and the clamping block abut against the clamping block, support the fixture block tightly between chucking spare and first raised grain, the fixture block can't take place deformation this moment, and because there is the recess on the first raised grain, the fixture block just is restricted in the recess, can't slide on first raised grain again, make the nook closing member can not take place to remove in the puncture, influence the effect of puncture, after the puncture, need take out the nook closing member and check whether the puncture targets in place, nook closing member tube seat and nook closing member need take off this moment, direct removals chucking spare again this moment makes chucking spare and fixture block break away from, the fixture block has not the restriction of chucking spare, under elastic deformation's effect, the fixture block can slide on first raised grain, directly take off nook closing member tube seat and nook closing member from the outer cannula seat, it is convenient to take off the nook closing member, the time of taking off the nook closing member has been reduced, the operating time of operation has been reduced.

2. The utility model provides a locking type trocar, first raised grain sets up in first standing groove, makes the outer wall of the outstanding outer tube seat of first raised grain, makes first raised grain can not influence the installation of trocar, simultaneously because the setting of first standing groove, the fixture block can stretch into in the first standing groove, and first raised grain supports the position that tightly limits the needle core tube seat, and under the effect of first standing groove, make the fixture block can not be circumferential direction on outer tube seat outer wall this moment to influence the puncture.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of the overall structure of the locking trocar of the present invention;

FIG. 2 is an exploded view of the assembly of the outer cannula holder and the stylet holder in the present invention;

FIG. 3 is a schematic view of a needle core tube seat structure of the present invention;

fig. 4 is a schematic view of a clamping member of the present invention.

Description of reference numerals:

1. an outer sleeve seat; 2. a needle core tube seat; 3. a first raised grain; 4. a clamping block; 5. a clamping member; 51. clamping the tube seat; 52. a propping block; 6. a first placing groove; 7. a slider; 8. a second raised grain; 9. a second placing groove; 10. supporting a tube; 11. an injector connection section; 12. supporting the tube seat; 13. a needle core.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Examples

Referring to fig. 1-4, the present invention provides a locking trocar, which comprises an outer casing base 1, a trocar base 2, a clamping member 5 and a supporting tube 10, wherein the outer casing base 1 is hollow and has openings at both ends; the stylet tube seat 2 is arranged in a hollow mode, an opening is formed in one end, facing the outer cannula seat 1, of the stylet tube seat 2, one end of the stylet 13 is located in the stylet tube seat 2, the other end of the stylet 13 extends out of the stylet tube seat 2, the stylet tube seat 2 moves towards the outer cannula seat 1 until the stylet 13 extends into the outer cannula seat 1, one end, facing the stylet tube seat 2, of the outer cannula seat 1 extends into the stylet tube seat 2, the supporting tube 10 is arranged on one end, facing away from the stylet tube seat 2, of the outer cannula seat 1 and is coaxially arranged with the outer cannula seat 1, one end of the supporting tube 10 is communicated with the outer cannula seat 1, the supporting tube 10 and the stylet 13 are made of metal materials, and the outer cannula seat 1 and the stylet tube seat 2 are made of abs materials; the outer sleeve seat 1 is provided with first wavy grains 3 along the length direction, a fixture block 4 is arranged on the inner wall of the needle core tube seat 2, the fixture block 4 has elasticity, meanwhile, a through hole is formed in the side wall, located at the fixture block 4, of the needle core tube seat 2, the fixture block 4 is located at the through hole, one end of the fixture block 4 is connected with the needle core tube seat 2, the other end of the fixture block 4 can be bent towards the direction close to or far away from the axis of the needle core tube seat 2, and when the outer sleeve seat 1 is located in the needle core tube seat 2, the fixture block 4 slides on the first wavy grains 3; the clamping piece 5 is suitable for abutting against or being separated from the clamping block 4, and limits the position of the clamping block 4 when abutting against the clamping block 4, so that the clamping block 4 is clamped on the first wavy veins 3, and the clamping block 4 is limited to slide on the first wavy veins 3.

Before puncture, firstly, the needle core 13 is extended into the outer sleeve seat 1 back to one end of the needle core tube seat 2, then the needle core tube seat 2 is moved, so that the needle core 13 moves towards the other end in the needle core tube seat 2 until the needle core tube seat 2 moves to the position of the outer sleeve seat 1, so that the outer sleeve seat 1 is extended into the needle core tube seat 2, at the moment, the fixture block 4 on the inner wall of the outer sleeve seat 1 is positioned on the first wavy veins 3 on the outer sleeve seat 1, and the elastic fixture block 4 slides on the first wavy veins 3 until the inner walls of the outer sleeve seat 1 and the needle core tube seat 2 are tightly abutted, at the moment, the tip end of the needle core 13 is extended out of the support tube 10 on the outer sleeve seat 1, then the clamping piece 5 is moved, so that the clamping piece 5 is abutted against the fixture block 4, the fixture block 4 cannot be deformed, and because depressions are formed on the first wavy veins 3, the fixture block 4 is limited in the depressions, the depression cannot slide on the first wavy veins 3, so that the needle core 13 cannot move when the clamping piece 5 is abutted against the outer sleeve 5 and the first wavy veins 3, when the needle core tube seat 13 is moved, the needle core 13 is not moved, the needle core seat, the needle core 13 is not directly taken out of the needle core tube seat, the needle core 13, the needle is taken out, the needle core 13 is taken out, the needle is not taken out, the needle core seat, and the needle is directly, and the needle core 13 is taken out, and the needle is not taken out, the needle is convenient for the needle is taken out, and the needle is not taken out, at the operation, and the needle is not taken out, at the time is reduced, and the time is reduced, at the time of the needle is not taken out, and the time of the needle is reduced, and the needle is reduced, at the operation, and the operation, at the operation is convenient.

In addition, the outer cannula seat 1 is provided with a first placing groove 6 along the length direction thereof, the first placing groove 6 extends towards the direction of the needle core tube seat 2 and penetrates through the wall of the outer cannula seat 1, the first raised grains 3 are positioned in the first placing groove 6, the first raised grains 3 are arranged in the first placing groove 6, the first raised grains 3 do not protrude out of the outer wall of the outer cannula seat 1, the first raised grains 3 cannot influence the installation of the trocar, meanwhile, due to the arrangement of the first placing groove 6, the fixture block 4 can extend into the first placing groove 6 and abut against the first raised grains 3 to limit the position of the needle core tube seat 2, and at the moment, under the action of the first placing groove 6, the fixture block 4 cannot circumferentially rotate on the outer wall of the outer cannula seat 1, so that the puncture is influenced.

As an improved embodiment, the locking trocar further comprises a support tube 10 seat, the support tube 10 seat and the outer cannula seat 1 are coaxially arranged, and are also arranged in a hollow way, and both ends of the support tube are provided with openings, the support tube 10 seat is arranged at one end of the outer cannula seat 1, which is opposite to the trocar core tube seat 2, and is communicated with the inside of the outer cannula seat 1, the support tube 10 is arranged at one end of the support tube 10 seat, which is opposite to the outer cannula seat 1, and is communicated with the support tube 10, and the support tube 10 is installed in the outer cannula seat 1 through the support tube 10 seat.

The outer cannula base 1 is provided with an injector connecting section 11 towards one end of the stylet base 2, the injector connecting section 11 and the outer cannula base 1 are coaxially arranged, the injector connecting section 11 is communicated with the outer cannula base 1, the injector connecting section 11 is suitable for being connected with an external injector, when the stylet 13 extends out of the support tube 10 and the puncture is completed, the clamping piece 5 is directly moved again at the moment, the clamping piece 5 is separated from the clamping block 4, the clamping block 4 is not limited by the clamping piece 5, the clamping block 4 can slide on the first wavy veins 3 under the action of elastic deformation, the stylet base 2 and the stylet 13 are directly taken down from the outer cannula base 1, the injector connecting section 11 is exposed, the external injector is connected onto the injector connecting section 11, and whether the puncture is completed or not is checked through the injector.

As a specific embodiment, the clamping member 5 includes a clamping tube seat 51 sleeved on the outer cannula seat 1, the clamping tube seat 51 is made of PC material, the clamping tube seat 51 is hollow and has openings at two ends, before the stylet tube seat 2 is placed, the clamping tube seat 51 is sleeved on the outer cannula seat 1, the clamping tube seat 51 rotates on the outer cannula seat 1 along an axis, a gap is left between the outer cannula seat 1 and the clamping tube seat 51, the stylet tube seat 2 extends between the outer cannula seat 1 and the clamping tube seat 51, a resisting block 52 is arranged on an inner wall of the outer cannula seat 1, when the outer cannula seat 1 rotates until the resisting block 52 and the clamping block 4 are contacted, the clamping block 4 is limited between the resisting block 52 and the first wavy veins 3, the clamping block 4 is limited to slide on the first wavy veins 3, the clamping tube seat 51 rotates on the outer cannula seat 1 to drive the resisting block 52 to rotate, and when the clamping block 4 is located in the tube seat 51, the clamping tube seat 51 is driven to drive the clamping tube seat 51 to be capable of tightly contacted, or the clamping block 52 and the stylet tube seat 4 is separated from the movement or the movement is controlled. When the puncture needle is used, after the needle core tube seat 2 extends between the outer sleeve seat 1 and the clamping tube seat 51, the clamping block 4 and the abutting block 52 are in a separation state, so that the clamping block 4 is not in contact with the first raised grains 3, the clamping block 4 can move freely on the first raised grains 3 along the length direction of the first raised grains until the needle core 13 passes through the support tube 10, then the clamping tube seat 51 is rotated, in the rotating process of the clamping tube seat 51, the abutting block 52 rotates along with the clamping tube seat 51 until the abutting block 52 rotates to the position of the clamping block 4 and abuts against the clamping block 4, the clamping block 4 is pushed to move towards the first raised grains 3 until the clamping block 4 abuts against the first raised grains 3, the position of the clamping block 4 is limited, the clamping block 4 cannot slide freely on the first raised grains 3, the needle core 13 does not move at present positions of the needle core tube seat 2 and the needle core 13, the puncture is finished, after the puncture is finished, the clamping tube seat 51 is rotated again, the clamping block 52 is separated from the clamping block 4 and the clamping block 4 is separated from the first raised grains 3, the needle core tube seat is convenient for puncture to check, and the condition of the needle core 4 is taken out, and the needle core is convenient for the puncture.

As an alternative embodiment, the inner wall of the clamping tube seat 51 is further provided with a sliding block 7, the sliding block 7 has elasticity, a gap is left between the sliding block 7 and the inner wall of the clamping tube seat 51, the stylet tube seat 2 is provided with a circle of second raised grains 8 along the circumferential direction, and when the stylet tube seat 2 extends between the outer cannula seat 1 and the clamping tube seat 51, the sliding block 7 slides on the second raised grains 8 along the length direction thereof.

Simultaneously in order to make sliding block 7 can wave in second raised grain 8 and move ahead, chucking tube socket 51 inner wall is located sliding block 7 department and is provided with second standing groove 9, sliding block 7 is located the notch position of second standing groove 9 to one end and the 9 inner wall connection of second standing groove, the outstanding second standing groove 9 of other end surface cause sliding block 7 to retract or stretch into second standing groove 9 toward in the second standing groove 9.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A locking trocar, comprising:

the outer sleeve seat (1) is hollow and is provided with openings at two ends;

the needle core tube seat (2) is arranged in a hollow mode, an opening is formed in one end of the needle core tube seat (1) in the direction of the outer tube seat (1), one end of a needle core (13) is located in the needle core tube seat (2), the other end of the needle core tube seat extends out of the needle core tube seat (2), the needle core tube seat (2) moves towards the outer tube seat (1) until the needle core (13) extends into the outer tube seat (1), and one end, facing the needle core tube seat (2), of the outer tube seat (1) extends into the needle core tube seat (2);

the outer sleeve seat (1) is provided with first raised grains (3) along the length direction of the outer sleeve seat, a clamping block (4) is arranged on the inner wall of the stylet tube seat (2), the clamping block (4) has elasticity, and when the outer sleeve seat (1) is located in the stylet tube seat (2), the clamping block (4) slides on the first raised grains (3);

the clamping piece (5) is suitable for abutting against or separating from the clamping block (4), and limits the position of the clamping block (4) when abutting against the clamping block (4), so that the clamping block (4) is clamped on the first raised grains (3), and the clamping block (4) is limited to slide on the first raised grains (3).

2. The locking trocar according to claim 1, wherein the clamping member (5) comprises a clamping tube seat (51) sleeved on the outer cannula seat (1), the clamping tube seat (51) rotates on the outer cannula seat (1) along an axis, a gap is left between the outer cannula seat (1) and the clamping tube seat (51), and the stylet tube seat (2) extends into the gap between the outer cannula seat (1) and the clamping tube seat (51);

the inner wall of the outer sleeve seat (1) is provided with a abutting block (52), when the outer sleeve seat (1) rotates to the abutting block (52) to be abutted against the clamping block (4), the clamping block (4) is limited between the abutting block (52) and the first raised grains (3), and the clamping block (4) is limited to slide on the first raised grains (3).

3. The locking trocar according to claim 1, wherein the outer cannula holder (1) is provided with a first placing groove (6) along the length direction thereof, the first placing groove (6) extends towards the trocar holder (2) and penetrates through the wall of the outer cannula holder (1), and the first raised grains (3) are positioned in the first placing groove (6).

4. The locking type trocar according to claim 2, wherein a sliding block (7) is further arranged on the inner wall of the clamping tube seat (51), the sliding block (7) has elasticity, a gap is reserved between the sliding block (7) and the inner wall of the clamping tube seat (51), the needle core tube seat (2) is provided with a circle of second raised grains (8) along the circumferential direction of the needle core tube seat, and when the needle core tube seat (2) extends between the outer sleeve seat (1) and the clamping tube seat (51), the sliding block (7) slides on the second raised grains (8) along the length direction of the needle core tube seat.

5. The locking type trocar as claimed in claim 4, wherein the inner wall of the chucking socket (51) is provided with a second placing groove (9) at a sliding block (7), the sliding block (7) is located at a notch position of the second placing groove (9), and one end is connected with the inner wall of the second placing groove (9) and the other end surface protrudes out of the second placing groove (9).

6. The locking trocar as recited in claim 1, further comprising:

the supporting tube (10), the supporting tube (10) sets up on outer sleeve pipe seat (1) dorsad nook closing member seat (2) one end to with outer sleeve pipe seat (1) coaxial setting, supporting tube (10) one end and outer sleeve pipe seat (1) intercommunication.

7. The locking trocar according to claim 6, further comprising a support tube holder (12), wherein the support tube holder (12) is arranged on an end of the outer cannula holder (1) facing away from the trocar core tube holder (2), and the support tube (10) is arranged inside the support tube holder (12).

8. Locking trocar according to claim 1, characterised in that the outer cannula holder (1) is provided with a syringe connection section (11) at the end facing the stylet holder (2), the syringe connection section (11) and the outer cannula holder (1) being coaxially arranged, the syringe connection section (11) and the outer cannula holder (1) communicating, the syringe connection section (11) being adapted to be connected with an external syringe.

9. Locking trocar according to claim 6, characterised in that the needle core (13) and the support tube (10) are both made of a metallic material.