CN216135955U - Needle holding stitching instrument for laparoscope - Google Patents

Abstract

The utility model discloses a laparoscope needle-holding stitching instrument, which comprises a handle, wherein a main rod is arranged on the handle, the main rod extends towards the far end of the handle, a stitching needle capable of horizontally rotating is arranged at the far end of the main rod, a rotatable wire coil is arranged on the handle, and a stitching thread is wound on the wire coil. Compared with the prior art, through set up the horizontally pivoted seam needle on the mobile jib, realize the contained angle between adjustable seam needle and the mobile jib to quick switching satisfies different angle operation requirements, can make the art person in the abdominal cavity can have oneself to sew up, tie a knot in a flexible way like this.

Description

Needle holding stitching instrument for laparoscope

Technical Field

The utility model relates to a medical instrument, in particular to a laparoscope needle-holding stitching instrument.

Background

Laparoscopes play a significant role in the diagnosis and treatment of abdominal diseases, but the mobility and flexibility of laparoscopic surgery, such as that of the basic suturing of laparotomy, is largely lost. In order to make up for the deficiency, the laparoscope is used for stopping bleeding or closing tissues, simple but dangerous thermal coagulation, electrocoagulation, laser, clips, staples and the like are adopted, but the careless operation can cause severe bleeding or necrosis of surrounding tissues, so that the patient dies. Corresponding suturing devices are also improved correspondingly, for example, the utility model with the publication number of CN1729939A and the name of laparoscope suturing device and the utility model with the publication number of CN101449989A and the name of laparoscope suturing knotter are all in order to improve the maneuvering flexibility of suturing, but the structure is complex and the operation is not convenient, while the laparoscope needle-holding suturing device with the publication number of 107714116A can adjust the included angle between the needle and the main rod in a plugging and unplugging mode, but the needle needs to be adjusted in a manual plugging and unplugging mode, so that the operation time is increased, and the operation difficulty is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a laparoscope needle-holding stitching instrument, which aims to solve the technical problem of flexibly stitching and knotting in an abdominal cavity.

In order to solve the technical problem, the utility model adopts the following technical scheme: the utility model provides a needle stitching instrument is held to peritoneoscope, includes the handle, be equipped with the mobile jib on hand, the mobile jib extends towards the distal end of handle, but is equipped with horizontal pivoted seam needle at the distal end of mobile jib, is equipped with rotatable drum on hand, and the winding has the suture on the drum.

Further, the distal end of mobile jib is equipped with the needle fixing base, and the distal end of needle fixing base is equipped with the commentaries on classics needle groove, and commentaries on classics needle groove axial link up the distal end terminal surface of needle fixing base and radially link up the distal end of needle fixing base one side outer wall wherein to make the needle can at least the level rotate 90 degrees, be equipped with in the needle fixing base and carry out the activity fixed commentaries on classics needle hole to the needle, commentaries on classics needle hole and commentaries on classics needle groove intercommunication are equipped with the commentaries on classics needle axle with needle near-end vertically in the near-end of needle, and the commentaries on classics needle axle is located in the commentaries on classics needle hole.

Furthermore, the needle rotating groove comprises a straight needle groove and an inclined groove which are sequentially arranged from the center of the needle fixing seat to the outer wall of one side of the needle fixing seat, the straight needle groove is communicated with the inclined groove, the gradient of the inclined groove gradually ascends towards the near end direction of the needle fixing seat, so as to form a limit stop part with a slope surface between the straight needle groove and the inclined groove, the rotating needle hole is arranged at the near end of the straight needle groove and communicated with the straight needle groove, a needle pressing groove is arranged at the near end of the inclined groove, the needle pressing groove extends towards the direction of the needle rotating hole and is communicated with the straight needle groove and the needle rotating hole, a butt platform is formed at the bottom of the needle pressing groove, when the needle rotates from the straight needle groove to the needle pressing groove through the inclined groove, the needle is guided by the slope surface to rotate towards the inclined groove and lift up to the top end of the inclined groove, then the needle is guided by the needle pressing groove to fall down, so that the needle rotating shaft is placed in the needle rotating hole again, and the needle body part of the needle is limited by the needle pressing groove and abuts against the abutting platform.

Further, the mobile jib is hollow tubular structure, both ends are uncovered, be equipped with the fixed seat hole with the tucking groove at the near-end of seam needle fixing base, the fixed seat hole of changeing needle hole and commentaries on classics needle groove intercommunication, the fixed seat hole runs through the near-end terminal surface of seam needle fixing base, make its lumen intercommunication with the mobile jib, be equipped with the handle through-hole with the coaxial setting of mobile jib on hand, be equipped with the ejector pin in mobile jib and handle through-hole, the axial displacement of mobile jib and handle through-hole can be followed to the ejector pin, be equipped with fixing mechanism on the ejector pin, in order to fix the ejector pin, after the ejector pin removed towards the distal end of mobile jib, the distal end top of ejector pin is epaxial at the commentaries on classics needle, in order to fix the seam needle.

Furthermore, the fixing mechanism comprises a fixing screw arranged on the near end of the ejector rod and a thread arranged on the hole wall of the near end of the handle through hole, and the far end of the fixing screw is fixedly connected with the near end of the ejector rod.

Furthermore, the slope surface is a triangular slope which is obliquely radiated towards the direction of the straight needle groove from the top end of one side of the limiting blocking part, which is positioned on the outer wall of the needle fixing seat, as a vertex.

Furthermore, a wire coil groove is formed in the handle, the wire coil is rotatably fixed in the wire coil groove through a rotating shaft, a wire hole is formed in the handle and communicated with the wire coil groove, and a suture is led out from the wire hole.

Furthermore, the wire coil is provided with a winding shaft, the shaft wall of the winding shaft is provided with a spine-shaped bulge, and the suture is wound on the winding shaft.

Furthermore, the sewing needle also comprises a needle head front end, a needle head tail end and a needle rod part which are sequentially arranged from the far end to the near end, the rotating needle shaft is arranged at the near end of the needle rod part, the needle head front end and the needle head tail end are arc-shaped, and the needle rod part is wave-shaped.

Furthermore, the cross section of the front end of the needle head is oval, the long axis of the needle head is horizontally arranged, the concave arc-shaped parts are symmetrically arranged in the short axis direction of the front end of the needle head, the needle head threading through hole at the front end of the needle head is arranged between the two arc-shaped parts, the cross section of the tail end of the needle head is oval, the long axis of the needle head is horizontally arranged, and the tail end of the needle head and the front end of the needle head are coaxially arranged; the needle shaft portion is circular in cross-section.

Compared with the prior art, the adjustable abdominal cavity suturing device has the advantages that the horizontally rotatable suturing needle is arranged on the main rod, so that the included angle between the suturing needle and the main rod can be adjusted, the change is rapid, the use requirements of different angles are met, and an operator can flexibly suture and knot in the abdominal cavity.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2-1 is a schematic structural view of the needle holder of the present invention.

Fig. 2-2 is a schematic view of the internal structure of the needle holder of the present invention.

Fig. 2-3 are schematic external views of the needle holder of the present invention.

Fig. 3 is a schematic diagram of the structure of the boom of the present invention.

Fig. 4 is a schematic structural view of the handle of the present invention.

Figure 5 is a schematic diagram of the construction of the wire coil of the present invention.

FIG. 6 is a schematic view of the needle of the present invention entering the needle channel.

FIG. 7 is a schematic view of the construction of the needle of the present invention.

Fig. 8 is a sectional view taken along the direction a-a in fig. 7.

Fig. 9 is a cross-sectional view taken along the direction B-B in fig. 7.

Fig. 10 is a cross-sectional view taken along the direction C-C in fig. 7.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The proximal end of the utility model is the end close to the operator, and the distal end is the end far away from the operator.

As shown in figure 1, the utility model discloses a laparoscope needle-holding stitching instrument, which comprises a handle 1 and a main rod 2, wherein the main rod 2 is fixed on the handle 1, the main rod 2 extends towards the far end of the handle 1, the far end of the main rod 2 is provided with a stitching needle 3 which can horizontally rotate, a rotatable wire coil 8 is arranged on the handle 1, and a stitching thread 9 is wound on the wire coil 8.

Through the sewing needle 3 that can horizontally rotate, realized the change of a plurality of angles in the abdominal cavity to satisfy and sew up or tie a knot in narrow and small space in the abdominal cavity.

As shown in fig. 1, 3 and 4, the handle 1 is fixedly connected with the main rod 2 by a threaded connection, and the main rod 2 is fixed at the far end of the handle 1.

As shown in fig. 1, 3 and 4, the handle 1 is provided with a handle through hole 13 coaxially provided with the main lever 2.

As shown in fig. 2-1, 2-2 and 2-3, the distal end of the main rod 2 is provided with a needle holder 4, the needle holder 4 is cylindrical, the distal end of the needle holder 4 having a diameter matched with the outer diameter of the main rod 2 is provided with a needle rotating groove 21, the needle rotating groove 21 axially penetrates through a distal end surface of the needle holder 4 and radially penetrates through an outer wall of one of the distal ends of the needle holder 4, so that the needle 3 can rotate at least 90 ° horizontally, and specifically, the needle rotating groove 21 is axially disposed in the needle holder 4. A needle rotating hole 5 for movably fixing the needle 3 is arranged in the needle fixing seat 4, the needle rotating hole 5 is communicated with the needle rotating groove 21, a needle rotating shaft 31 vertical to the proximal end of the needle 3 is arranged at the proximal end of the needle 3, and the needle rotating shaft 31 is arranged in the needle rotating hole 5 so that the needle 3 can horizontally rotate.

As shown in fig. 2-1, 2-2 and 2-3, based on the above structure, the needle rotating groove 21 includes a straight needle groove 26 and an inclined groove 27 sequentially arranged from the center of the needle holder 4 to one outer wall of the needle holder 4, the inclined groove 27 penetrates through the distal end surface of the needle holder 4 and one outer wall of the needle holder 4, the straight needle groove 26 communicates with the inclined groove 27, the inclined groove 27 gradually ascends toward the proximal end of the needle holder 4, a limit stopper 28 having a slope 29 is formed between the straight needle groove 26 and the inclined groove 27, the slope 29 of the limit stopper 28 is a triangular slope obliquely projected from the top end of one side of the limit stopper 28 on the outer wall of the needle holder 4 as a vertex toward the straight needle groove 26 to guide the needle 3 to rotate between the straight needle groove 26 and the inclined groove 27, the needle rotating hole 5 is arranged at the proximal end of the straight needle groove 26 and communicates with the straight needle groove 26, the needle pressing groove 22 penetrating through the outer wall of the needle fixing seat 4 is arranged at the near end of the inclined groove 27, the notch of the needle pressing groove 22 located on the side wall of the needle fixing seat 4 and the notch of the inclined groove 27 located on the side wall of the needle fixing seat 4 are arranged on the same side, the needle pressing groove 22 extends towards the direction of the needle rotating hole 5 and is communicated with the straight needle groove 26 and the needle rotating hole 5, the abutting platform 23 is formed at the bottom of the needle pressing groove 22, the extending direction of the needle pressing groove 22 is perpendicular to the axis of the needle fixing seat 4, when the needle 3 rotates from the straight needle groove 26 to the needle pressing groove 22 through the inclined groove 27, the needle 3 is guided by the slope 29 on the limiting blocking part 28 to lift up to the top end of the inclined groove 27 and then is guided by the needle pressing groove 22 to fall, so that the needle rotating shaft 31 is placed in the needle rotating hole 5 again, and the needle body part of the needle 3 is limited by the needle pressing groove 22 and abuts against the abutting platform 23.

As shown in fig. 2-2, the upper end groove wall of the straight needle groove 26 is a slope connected with the upper end groove wall of the inclined groove 27, so that the needle 3 can smoothly rotate when rotating.

In the present invention, the diameter of the sewing needle 3 is matched with the inclined groove 27 and the needle pressing groove 22 of the straight needle groove 26, so that the sewing needle can smoothly rotate in the needle rotating groove 21.

As shown in fig. 2-1, 2-2 and 2-3, the bottom of the needle pressing groove 22 is an arc surface matched with the arc of the outer wall of the sewing needle 3, and the bottom of the needle pressing groove 22 is at a height which is basically kept on the same horizontal plane with the bottom of the straight needle groove 26.

As shown in FIG. 1, a threading through hole 25 is provided on the needle holder 4 to relatively fix the distal end of the suture 9, and the threading through hole 25 may be provided below the inclined groove 27 of the needle holder 4.

As shown in fig. 1, the main rod 2 is a hollow tubular structure, two ends of the main rod are open, a fixing seat hole 24 communicated with the needle pressing groove 22, the needle rotating hole 5 and the needle rotating groove 21 is formed in the proximal end of the needle sewing fixing seat 4, the fixing seat hole 24 penetrates through the proximal end face of the needle sewing fixing seat 4 to enable the needle sewing fixing seat to be communicated with a lumen of the main rod 2, a handle through hole 13 coaxially formed with the main rod 2 is formed in the handle 1, the handle through hole 13 is communicated with the lumen of the main rod 2, a first thread is formed on a proximal tube body of the main rod 2, a second thread is formed on a proximal hole wall of the handle through hole 13, the main rod 2 is in threaded connection with the handle 1 through the first thread, so that the main rod 2 is fixedly connected with the handle 1, and the main rod 2 is fixed at the distal end of the handle 1; be equipped with ejector pin 6 in mobile jib 2 and the handle through-hole 13, the axial displacement of mobile jib 2 and handle through-hole 13 can be followed to ejector pin 6, is equipped with fixed establishment on the ejector pin 6 to fix ejector pin 6, after ejector pin 6 removed towards the distal end of mobile jib 2, the distal end top of ejector pin 6 was on the needle shaft 31, fixed with the angle of butt stitch needle 3.

As shown in fig. 1, the fixing mechanism includes a fixing screw 7 disposed on the proximal end of the push rod 6 and a thread disposed on the lumen wall of the proximal end of the push rod 6, and the distal end of the fixing screw 7 is fixedly connected to the proximal end of the push rod 6, so that after the push rod 6 is inserted from the proximal end of the handle through hole 13, the fixing screw extends into the fixing seat hole 24 through the handle through hole 13 and the lumen of the main rod 2.

As shown in fig. 4, a wire coil groove 11 is formed in the handle 1, the wire coil groove 11 is adapted to the wire coil 8, the wire coil 8 is rotatably fixed in the wire coil groove 11 through a rotating shaft, the wire coil groove 11 is formed in one side surface of the handle 1, a lead hole 12 is formed in the handle 1, the lead hole 12 is communicated with the wire coil groove 11, and the suture 9 is led out from the lead hole 12.

As shown in fig. 4, a lead hole 12 is provided at the distal end of the handle 1 to facilitate the extraction and use of the suture 9.

As shown in fig. 5, the spool 8 has a spool 81, the spool 81 has a ratchet-shaped protrusion 82 on the wall thereof, the suture 9 is wound on the spool 81, and the spool 81 has a through hole to be rotatably fixed in the spool groove 11 by a rotation shaft.

As shown in fig. 7, 8, 9 and 10, the sewing needle 3 further includes a needle head end 32, a needle tail end 33 and a needle bar portion 34 arranged in this order from the distal end to the proximal end, the rotating needle shaft 31 is arranged at the proximal end of the needle bar portion 34, the needle head end 32 and the needle tail end 33 are curved, the needle bar portion 34 is waved, when the needle tip 32, the needle tail 33 and the shaft portion 34 are combined to form a W-shape, as shown in fig. 8, the needle tip 32 has an oval-shaped cross-section, the major axis of the needle is horizontally arranged, the minor axis of the needle head front end 32 is symmetrically provided with concave arc parts 321, a needle head threading through hole on the needle head front end 32 is arranged between the two arc parts 321, the section of the needle head front end 32 is gradually changed into an elliptic taper shape from the needle point, as shown in FIG. 9, the section of the needle tail end 33 is oval, the long axis is also horizontally arranged, and the needle tail end 33 and the needle front end 32 are coaxially arranged; as shown in fig. 10, the shaft portion 34 is circular in cross-section so that the leading end 32 of the needle and the trailing end 33 of the needle gradually change from an oval shape to a circular shape.

In the present invention, the size of the needle tip 32 is equal to the size of the needle tail 33, and the diameter of the shaft portion is less than the length of the long axis of the needle tip 32.

When in use, the angle of the sewing needle 3 is adjusted, and then the far end of the mandril 6 is tightly propped against the needle rotating shaft 31 of the sewing needle, thereby realizing the fixation of the sewing needle 3.

The sewing and knotting technique of the utility model is as follows:

1. entering the abdominal cavity: adjust to required angle in the needle groove 21 of turning round needle 3 that will wear suture 9, screw up ejector pin 6, make needle 1 fixed, and with mobile jib 2 on same straight line, get into the abdominal cavity after through 6 ~ 7mm sleeve pipe, unscrew ejector pin 6, through the angular adjustment of pressing the stitch 3 of tong to sewing with the angle, needle 3 rotates to last entering in chute 27 through domatic 29's guide and presses needle groove 22, screw up ejector pin 6 once more, make needle 3 fixed, needle 3 is 90 contained angles with mobile jib 2 this moment, in order to do benefit to smoothly sewing up.

2. And (3) sewing: and (3) holding the suturing device by the right hand to enable the suture needle 3 to penetrate through the suturing part, then further withdrawing the needle to enable the suture thread 9 to be exposed from the needle hole by 4-5 mm, holding the thread clamping forceps by the operator with the left hand to jack and clamp the suture thread at the front end, withdrawing the suture needle, completing the suture threading, and releasing the broken end of the suture thread by the thread clamping forceps.

3. And (3) knotting: after the suture needle 3 with the thread rotates around the thread clamp for 1 circle (square knot making) or 2 circles (surgical knot making), the thread clamp clamps the broken end of the thread, and the stitching instrument and the thread clamp are correspondingly tensioned to complete one knot. The second or third junction is completed in the same way.

4. Trimming: the stitching instrument and the thread clamp draw the straight thread and the thread scissors cut off. The stitching instrument does not withdraw from the abdominal cavity, and secondary stitching and knotting are carried out.

5. And (3) exiting: the ejector rod 6 is unscrewed, the suture needle 3 is rotated into the needle rotating groove 21 through the thread clamp, then the ejector rod 6 is screwed, and the main rod 2 and the suture needle 3 are drawn out of the abdominal cavity together.

The present invention can perform:

1. thread transferring and knotting: when the suture is not sutured, the suture is delivered and knotted by a suturing device, and the broken end of the tissue is ligated. The method is the same as above. Can replace the ferrule technology adopted by the prior laparoscope, and save a large amount of material cost.

2. Intermittent sewing: the sewing and knotting skill is intermittent sewing.

3. 8-shaped sewing: after the stitching device stitches and threads, the suture is knotted without cutting the suture, the second needle stitching and threading are carried out, after the thread clamp passes through the suture at the needle hole, the other broken end of the suture is clamped and pulled out, the stitching needle exits the tissue, the two ends of the suture are knotted, and the 8-shaped stitching is completed.

4. Continuous sewing and chain sewing: the same 8-shaped suture is adopted, but the directions of the entering and exiting suture needles are different.

The utility model has the advantages that the inserting and pulling adjustment of the suture needle in the abdominal cavity is not needed, thereby reducing the operation difficulty of surgical instruments, and the operation requirements of different angles are met due to the quick conversion, thereby enabling an operator to flexibly suture and knot in the abdominal cavity and shortening the operation time.

Claims (10)

1. A laparoscopic needle-holding stapler comprising a handle (1), characterized in that: be equipped with mobile jib (2) on handle (1), mobile jib (2) extend towards the distal end of handle (1), but be equipped with horizontal pivoted seam needle (3) at the distal end of mobile jib (2), be equipped with rotatable drum (8) on handle (1), the winding has suture (9) on drum (8).

2. The laparoscopic needle-holding stapler of claim 1, wherein: the distal end of mobile jib (2) is equipped with seam needle fixing base (4), the distal end of seam needle fixing base (4) is equipped with needle rotating groove (21), needle rotating groove (21) axial link up the distal end terminal surface of seam needle fixing base (4) and radially link up the distal end of seam needle fixing base (4) one of them side outer wall, so that 90 degrees are rotated to the level at least of making seam needle (3), be equipped with in seam needle fixing base (4) and carry out activity fixed needle rotating hole (5) to seam needle (3), needle rotating hole (5) and needle rotating groove (21) intercommunication, be equipped with near-end of seam needle (3) with seam needle (3) near-end vertically needle rotating shaft (31), needle rotating shaft (31) are located in needle rotating hole (5).

3. The laparoscopic needle-holding stapler of claim 2, wherein: the needle rotating groove (21) comprises a straight needle groove (26) and a chute (27) which are sequentially arranged from the center of the needle fixing seat (4) to the outer wall of one side of the needle fixing seat (4), the straight needle groove (26) is communicated with the chute (27), the slope of the chute (27) gradually ascends towards the proximal direction of the needle fixing seat (4) so as to form a limit blocking part (28) with a slope surface (29) between the straight needle groove (26) and the chute (27), a needle rotating hole (5) is arranged at the proximal end of the straight needle groove (26) and is communicated with the straight needle groove (26), a needle pressing groove (22) is arranged at the proximal end of the chute (27), the needle pressing groove (22) extends towards the needle rotating hole (5) and is communicated with the straight needle groove (26) and the needle rotating hole (5), a butt platform (23) is formed at the bottom of the needle pressing groove (22), and when a needle (3) rotates from the straight needle groove (26) to the needle pressing groove (22) through the chute (27), the sewing needle (3) is guided by the slope surface (29) to rotate towards the inclined groove (27) and lift up to the top end of the inclined groove (27), and then falls down under the guidance of the needle pressing groove (22), so that the needle rotating shaft (31) is placed in the needle rotating hole (5) again, and the needle body part of the sewing needle (3) is limited by the needle pressing groove (22) and is propped against the propping platform (23).

4. The laparoscopic needle-holding stapler of claim 3, wherein: the main rod (2) is a hollow tubular structure, two ends of the main rod are open, a fixing seat hole (24) communicated with the needle pressing groove (22), the needle rotating hole (5) and the needle rotating groove (21) is arranged at the near end of the needle sewing fixing seat (4), the fixing seat hole (24) penetrates through the near end surface of the needle sewing fixing seat (4) to be communicated with the tube cavity of the main rod (2), a handle through hole (13) which is coaxial with the main rod (2) is arranged on the handle (1), a mandril (6) is arranged in the main rod (2) and the handle through hole (13), the mandril (6) can move along the axial direction of the main rod (2) and the handle through hole (13), a fixing mechanism is arranged on the mandril (6) to fix the mandril (6), when the ejector rod (6) moves towards the far end of the main rod (2), the far end of the ejector rod (6) is abutted against the needle rotating shaft (31) so as to fix the sewing needle (3).

5. The laparoscopic needle-holding stapler of claim 4, wherein: the fixing mechanism comprises a fixing screw (7) arranged on the near end of the ejector rod (6) and a thread arranged on the hole wall of the near end of the handle through hole (13), and the far end of the fixing screw (7) is fixedly connected with the near end of the ejector rod (6).

6. The laparoscopic needle-holding stapler of any one of claims 3 to 5, wherein: the slope surface (29) is a triangular slope surface which is obliquely radiated towards the direction of the straight needle groove (26) from the top end of one side of the limit blocking part (28), which is positioned on the outer wall of the needle fixing seat (4), as a vertex.

7. The laparoscopic needle-holding stapler of claim 1, wherein: the wire coil is characterized in that a wire coil groove (11) is formed in the handle (1), a wire coil (8) is rotationally fixed in the wire coil groove (11) through a rotating shaft, a wire hole (12) is formed in the handle (1), the wire hole (12) is communicated with the wire coil groove (11), and a suture (9) is led out from the wire hole (12).

8. The laparoscopic needle-holding stapler according to claim 1 or 7, wherein: the wire coil (8) is provided with a winding shaft (81), the shaft wall of the winding shaft (81) is provided with a spine-shaped bulge (82), and the suture (9) is wound on the winding shaft (81).

9. The laparoscopic needle-holding stapler of claim 1, wherein: the sewing needle (3) further comprises a needle head front end (32), a needle head tail end (33) and a needle rod part (34) which are sequentially arranged from the far end to the near end, the needle rotating shaft (31) is arranged at the near end of the needle rod part (34), the needle head front end (32) and the needle head tail end (33) are arc-shaped, and the needle rod part (34) is wave-shaped.

10. The laparoscopic needle-holding stapler of claim 9, wherein: the section of the front end (32) of the needle head is oval, the long axis of the front end (32) of the needle head is horizontally arranged, concave arc-shaped parts (321) are symmetrically arranged in the short axis direction of the front end (32) of the needle head, a needle head threading through hole of the front end (32) of the needle head is arranged between the two arc-shaped parts (321), the section of the tail end (33) of the needle head is oval, the long axis of the tail end (33) of the needle head is horizontally arranged, and the tail end (33) of the needle head and the front end (32) of the needle head are coaxially arranged; the shank portion (34) is circular in cross-section.

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