CN212382671U

CN212382671U - Expansion type fixing pin

Info

Publication number: CN212382671U
Application number: CN202021436029.1U
Authority: CN
Inventors: 蒋鹏
Original assignee: Beijing Zhong An Tai Hua Science & Technology Co ltd
Current assignee: Beijing Zhong An Tai Hua Science & Technology Co ltd
Priority date: 2020-07-18
Filing date: 2020-07-18
Publication date: 2021-01-22
Anticipated expiration: 2030-07-18

Abstract

The application relates to the field of medical instruments, in particular to an expansion type fixing pin. The utility model provides an expanded type fixing pin, includes fixed sheath and staple, the fixed sheath includes hollow tube and integrated into one piece at the end of hollow tube tip, and the position shaping that is close to the end on end and the hollow tube has multichannel fracture, and multichannel fracture intersects in end middle part position, the staple is located the fixed sheath to with fixed sheath threaded connection. After one end of the artificial ligament is placed in the bone hole, the fixing sheath is placed in the bone hole. Then put into the staple, twist the staple through the instrument, the inside wall of staple butt end, final end and hollow tube are along the position separation of fracture and outside deformation expansion, and the inseparable butt of the inside wall in lateral wall and the bone hole of hollow tube is fixed. Because the fixing sheath contacted with the ligament can not generate cutting force on the ligament in the whole fixing process, the damage to the ligament when the ligament is fixed is reduced.

Description

Expansion type fixing pin

Technical Field

The application relates to the field of medical instruments, in particular to an expansion type fixing pin.

Background

More and more people are moving and have injuries to the tendon ligament caused by improper exercise. For patients with cruciate ligament injury of the knee joint, cruciate ligament reconstruction is a good treatment method. The function of the joint can be recovered after the cruciate ligament is reconstructed, and the probability of occurrence of complications such as gonitis and the like is reduced.

In recent years, with the continuous improvement of implant design and the continuous improvement of surgical techniques, the reconstruction effect of the cruciate ligament is better and better. In the process of reconstructing the cruciate ligament, after one end of the ligament is placed into the bone hole, the ligament needs to be fixed. The prior technical scheme is that the interface screw is used for fixing, and the interface screw adopts a thread design, so that the cutting force is extremely easy to generate on the autologous tendon, the damage of the reconstructed ligament is caused, and the reconstruction strength is reduced.

SUMMERY OF THE UTILITY MODEL

To reduce the damage to the ligament when securing the ligament, the present application provides an expansion type fixation pin.

The application provides an expansion type fixing pin, adopts following technical scheme:

the utility model provides an expanded type fixing pin, includes fixed sheath and staple, the fixed sheath includes hollow tube and integrated into one piece at the end of hollow tube tip, and the position shaping that is close to the end on end and the hollow tube has multichannel fracture, and multichannel fracture intersects in end middle part position, the staple is located the fixed sheath to with fixed sheath threaded connection.

By adopting the technical scheme, after one end of the artificial ligament is placed into the bone hole, the fixing sheath is placed into the bone hole. Then put into the staple, twist the staple through the instrument, the inside wall of staple butt end, final end and hollow tube are along the position separation of fracture and outside deformation expansion, and the inseparable butt of the inside wall in lateral wall and the bone hole of hollow tube is fixed. Because the fixing sheath contacted with the ligament can not generate cutting force on the ligament in the whole fixing process, the damage to the ligament when the ligament is fixed is reduced.

Preferably, the outside shaping that the hollow tube is close to end one end has the multichannel annular to collude, and every annular colludes and the hollow tube link is the bottom, and the annular colludes and keeps away from hollow tube one end and be most advanced.

Through adopting above-mentioned technical scheme, the outside shaping annular that is close to end one end at the hollow tube colludes and makes the most advanced that the annular colluded can be fixed with the butt between the inside wall in bone hole, and frictional force between increase and the bone hole inside wall avoids the dowel to deviate from.

Preferably, each annular hook inclines from the middle of the bottom end to the tip end in the direction far away from the end head.

Through adopting above-mentioned technical scheme, set up the every way annular and collude toward the tip to the direction slope of keeping away from the end for the annular colludes the cooperation structure that forms the overhead kick when cooperating with the bone hole inside wall, makes the annular collude and is difficult for taking place relative displacement between the bone hole inner wall.

Preferably, the middle part shaping of staple has the nail through-hole along staple length direction, the middle part shaping of end has the sheath through-hole, and the nail through-hole is just to the sheath through-hole when staple and fixed sheath threaded connection cooperate, nail through-hole and sheath through-hole are worn to link through same root locating lever.

Through adopting above-mentioned technical scheme, set up nail through-hole and sheath through-hole to nail through-hole and sheath through-hole and pass through the locating lever and link, make the central point of staple and fixed sheath put and align, when going into the bone hole with fixed sheath and staple installation, relative skew can not take place in center between them, and the inflation degree inconsistent of each direction when avoiding causing fixed sheath inflation behind both relative point shifts.

Preferably, at least one force application groove/force application block along the length direction of the nail through hole is formed on the inner wall of the nail through hole.

Through adopting above-mentioned technical scheme, shaping application of force groove or application of force piece make specific instrument can with follow closely through-hole and application of force hole/application of force piece cooperation come the transmission moment of torsion drive staple to rotate on the inside wall of nail through-hole.

Preferably, the outer diameter of one end of the fixing nail close to the end head is gradually reduced towards the end head.

Through adopting above-mentioned technical scheme, set up the staple and reduce towards the direction external diameter that is close to the end gradually for during staple and end butt, can begin to strut the end outwards along the fracture gradually from the middle part.

Preferably, a hemispherical groove is formed in one side, facing the hollow pipe, of the end head, and the inner diameter of the groove is equal to that of the hollow pipe.

Through adopting above-mentioned technical scheme, set up hemispherical recess and come to make the end can be extruded outwards to strut with the end part cooperation of staple.

Preferably, the hollow tube is kept away from end one end and is had a plurality of shaping holes around circumference equipartition shaping, all is equipped with the butt piece in every shaping hole, and one side and the downthehole wall side integrated into one piece of shaping of butt piece, the surface shaping of butt piece has the multichannel bar to collude.

Through adopting above-mentioned technical scheme, set up the butt piece and make fixed sheath when putting into the bone hole, the bar colludes and the inside wall extrusion deformation in bone hole for the butt piece is to the direction deformation in the hollow tube. The fixing nail is screwed, the fixing nail enters the fixing sheath to abut against the inner side face of the abutting part in the process, the abutting part is extruded by the fixing nail to deform outwards, and the strip-shaped hook of the abutting part is finally abutted and positioned with the inner side wall of the bone hole tightly.

In summary, the present application includes at least one of the following beneficial technical effects:

1. after one end of the artificial ligament is placed into the bone hole, the fixing sheath is placed into the bone hole; then, a fixing nail is placed in the fracture, the fixing nail is screwed by a tool and is abutted against the inner side wall of the end head, finally, the end head and the hollow pipe are separated along the fracture position and are deformed and expanded outwards, and the outer side wall of the hollow pipe is tightly abutted against and fixed with the inner side wall of the bone hole; because the fixing sheath contacted with the ligament can not generate cutting force on the ligament in the whole fixing process, the damage to the ligament when the ligament is fixed is reduced.

2. The outside shaping annular that is close to end one end at the hollow tube is colluded and is made the most advanced that the annular colluded can be fixed with the butt between the inside wall in bone hole, and frictional force between increase and the bone hole inside wall avoids the dowel to deviate from.

Drawings

FIG. 1 is a schematic structural view of an embodiment;

FIG. 2 is a schematic cross-sectional view taken along the line A-A in FIG. 1;

FIG. 3 is an isometric schematic view of an embodiment;

fig. 4 is a schematic structural view of the fixing nail in the embodiment.

Description of reference numerals: 1. a fixing sheath; 2. fixing nails; 3. a hollow tube; 4. a tip; 5. a groove; 6. a ring hook; 7. a sheath through hole; 8. breaking off; 9. forming holes; 10. an abutting member; 11. a strip hook; 12. nailing through holes; 13. positioning a rod; 14. a force application groove.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses an expansion type fixing pin.

As shown in fig. 1 and 2, the expansion type fixing pin comprises a fixing sheath 1 and a fixing nail 2, wherein the fixing nail 2 is screwed in the fixing sheath 1.

As shown in fig. 1 and 2, the fixing sheath 1 comprises a hollow tube 3 and a tip 4 integrally formed at one end of the hollow tube 3, wherein the tip 4 is hemispherical and the diameter of the tip 4 is equal to the outer diameter of the hollow tube 3. A hemispherical groove 5 is formed in one side, facing the hollow pipe 3, of the end 4, so that the end 4 is a hemispherical shell with equal wall thickness, and the diameter of the groove 5 is equal to the inner diameter of the hollow pipe 3. The outside shaping that hollow tube 3 is close to 4 one ends in end has the multichannel annular to collude 6, and every annular colludes 6 and 3 links of hollow tube and be the bottom, and the annular colludes 6 and keeps away from 3 one ends of hollow tube and be most advanced, and the annular colludes 6 and toward the direction slope of keeping away from end 4 from the bottom middle part to most advanced. A sheath through hole 7 is formed in the middle of the end head 4, three fractures 8 are formed in the positions, close to the end head 4, of the end head 4 and the hollow tube 3, the three fractures 8 are communicated with the sheath through hole 7, and the end head 4 and the part, close to the end head 4, of the hollow tube 3 are trisected through the three fractures 8. When the fixing nail 2 is screwed into the fixing sheath 1, the fixing nail 2 is abutted against the end head 4 to drive the end head 4 and the hollow tube 3 to separate along the position of the fracture 8 and expand outwards in a deformation mode.

As shown in figures 2 and 3, three square forming holes 9 are uniformly formed in one end, far away from the end head 4, of the hollow tube 3 in the circumferential direction, an abutting part 10 is integrally formed in each forming hole 9, and only one side, close to the end head 4, of each abutting part 10 is connected with the inner side wall of each forming hole 9. The outer surface of the abutting part 10 is flush with the outer surface of the hollow tube 3, a strip-shaped hook 11 is formed on the outward side of the abutting part 10, and when the cross section of the abutting part is observed, the height of the strip-shaped hook 11 is larger than that of the annular hook 6. The connection stability of the fixing pin is further increased by the abutting of the strip-shaped hook 11 and the inner side wall of the bone hole.

As shown in fig. 2 and 4, the fixing nail 2 is cylindrical, and the outer diameter of the fixing nail 2 decreases gradually from the end close to the head 4. The middle part shaping of staple 2 has along 2 length direction's of staple through-holes 12, and the nail through-hole 12 is just to sheath through-hole 7. The nail through hole 12 and the sheath through hole 7 are connected through the positioning rod 13 in a penetrating manner, and the fixing nail 2 and the fixing sheath 1 are positioned through the positioning rod 13, so that the fixing nail 2 and the fixing sheath 1 are ensured to be aligned in the center when in use.

As shown in fig. 4, four force applying grooves 14 are uniformly formed on the inner wall of the nail through hole 12 along the length direction of the nail through hole 12, and a tool matched with the shape of the nail through hole 12 is inserted into the nail through hole 12 to drive the fixing nail 2 to rotate; it is also possible to provide a force application block on the inner wall of the nail through hole 12, and a corresponding groove is formed on the tool, which is not shown in the drawings.

The specific using process is as follows:

bone holes are formed in the bone, and the diameter of each bone hole is close to the maximum outer diameter of the annular hook 6. After one end of the artificial ligament is placed in the bone hole, the fixing sheath 1 is also placed in the bone hole. The strip-shaped hook 11 and the inner side wall of the bone hole are extruded, so that the abutting part 10 is deformed towards the direction in the hollow tube 3.

Then put into staple 2, twist through the instrument and move staple 2, the in-process that staple 2 got into fixed sheath 1 is with the medial surface butt of butt 10, and the outside deformation of butt 10 is extruded to staple 2, and the bar of butt 10 is colluded 11 and is finally followed closely the butt location with the bone hole inside wall. Continue to twist forward staple 2, the inside wall of 2 butt end of staple 4, final end 4 and hollow tube 3 along the position separation of fracture 8 and outside deformation expansion, the annular colludes 6 and the inseparable butt location of the inside wall in bone hole.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An expansion type fixing pin is characterized in that: including fixed sheath (1) and staple (2), fixed sheath (1) includes hollow tube (3) and integrated into one piece end (4) at hollow tube (3) tip, and the position shaping that is close to end (4) on end (4) and hollow tube (3) has multichannel fracture (8), and multichannel fracture (8) cross in end (4) middle part position, staple (2) are located fixed sheath (1) to with fixed sheath (1) threaded connection.

2. The intumescent fixing pin according to claim 1, characterized in that: the outside shaping that hollow tube (3) are close to end (4) one end has the multichannel annular to collude (6), and every channel annular colludes (6) and hollow tube (3) link and is the bottom, and the annular colludes (6) and keeps away from hollow tube (3) one end and be most advanced.

3. The intumescent fixing pin according to claim 2, characterized in that: each annular hook (6) inclines from the middle part of the bottom end to the tip end towards the direction far away from the end head (4).

4. The intumescent fixing pin according to claim 1, characterized in that: the middle part shaping of staple (2) has along staple (2) length direction's nail through-hole (12), the middle part shaping of end (4) has sheath through-hole (7), and when staple (2) and fixed sheath (1) threaded connection cooperate, nail through-hole (12) just to sheath through-hole (7), link through with sheath through-hole (7) through same root locating lever (13) nail through-hole (12).

5. The intumescent fixing pin according to claim 4, characterized in that: at least one force application groove (14)/force application block along the length direction of the nail through hole (12) is formed on the inner wall of the nail through hole (12).

6. The intumescent fixing pin according to claim 1, characterized in that: one end of the fixing nail (2) close to the end head (4) is gradually reduced in outer diameter towards the end head (4).

7. The intumescent fixing pin according to claim 6, characterized in that: and a hemispherical groove (5) is formed in one side, facing the hollow pipe (3), of the end head (4), and the inner diameter of the groove (5) is equal to that of the hollow pipe (3).

8. The intumescent fixing pin according to claim 1, characterized in that: end (4) one end is kept away from in hollow tube (3) has a plurality of shaping holes (9) around circumference equipartition shaping, all is equipped with butt piece (10) in every shaping hole (9), one side and shaping hole (9) inner wall side integrated into one piece of butt piece (10), and the surface shaping of butt piece (10) has the multichannel bar to collude (11).