CN108403173B

CN108403173B - Extrusion nail for fixing ligament in orthopedics department and assembling tool thereof

Info

Publication number: CN108403173B
Application number: CN201810276945.4A
Authority: CN
Inventors: 王玉珏; 赵金忠; 蒋佳; 孙杨
Original assignee: Shenzhen Corliber Scientific Co ltd; Shanghai Sixth Peoples Hospital
Current assignee: SHENZHEN CORLIBER SCIENTIFIC Co.,Ltd.
Priority date: 2017-12-30
Filing date: 2018-03-30
Publication date: 2021-03-02
Anticipated expiration: 2038-03-30
Also published as: CN211583317U; CN112971885A; CN108523954A; CN108403173A; CN208725787U; CN109793544A; CN112971885B; CN209018822U; CN209996455U; CN112971886B; CN112971886A

Abstract

The invention provides a compression nail for fixing ligaments, which comprises: the nail body, it is the column, and the periphery of nail body has the screw to in the periphery of nail body, still be provided with along the length direction's of nail body two at least recesses, the recess runs through the nail body along the length direction of nail body. According to the invention, the extrusion nail can inhibit the risk of slippery threads and is beneficial to the growth of bone tissues, and the extrusion nail is easy to form an occlusion structure with the tissues to prevent loosening. In addition, the invention also provides an assembling tool which is used for operating the extrusion nail for fixing the ligament.

Description

Extrusion nail for fixing ligament in orthopedics department and assembling tool thereof

Technical Field

The invention relates to the field of medical instruments, in particular to an extrusion nail for fixing ligaments for orthopedics and an assembling tool thereof.

Background

Cruciate ligament injury is one of the common sports injuries in daily life. The tearing of the cruciate ligaments can directly affect the motor ability of a patient, and improper treatment can cause instability of the knee joint and secondary articular cartilage damage, and finally affect the function of the knee joint. At present, the cruciate ligament reconstruction under an arthroscope by utilizing bone nails is one of the main treatment means of cruciate ligament injury. Fix the tendon in the bone tunnel through the bone nail, guarantee the healing of tendon, can also prevent that the tendon from removing in the bone tunnel and causing the tunnel to enlarge.

The first clinically used non-absorbable metal bone screws. The metal bone nail has the advantages of high material strength and firm fixation. However, since the metal bone nail is not absorbed by human body, if the metal bone nail stays in the human body permanently, the metal bone nail will bring certain harm to the human health. For example, osteolysis around the bone pins or exposure of the bone pins results in damage to the articular cartilage, formation of synovitis, and the like. In addition, some metal bone nails can be affected in the nuclear magnetic resonance examination, so that the nuclear magnetic resonance examination cannot be performed on the patient. If the patient is taken out by operation, secondary damage is caused to the patient, and more complications can be caused.

For this reason, bone nails made of absorbable materials have been developed. After years of improvement, the strength of the bone nail made of the absorbable material is greatly improved, and the characteristic of absorbability after implantation greatly reduces inconvenience and injury to patients. However, in clinical operation, the improved absorbable material has lower strength compared with metal, and is easy to cause slippery condition in use. Once the slippery thread appears, the doctor can hardly take out the failed bone nail, which brings inconvenience to the doctor.

In addition, because the bone nail made of the absorbable material is not uniformly degraded when degraded in a bone tunnel, the bone tissue is not uniformly grown, even the fixation strength of the bone nail is insufficient, and the loosening and displacement are caused, thereby bringing great hidden trouble and inconvenience to patients.

Disclosure of Invention

The present invention has been made in view of the above-described state of the art, and an object thereof is to provide a compression nail capable of suppressing the risk of slippery threads and facilitating the growth of bone tissue.

To this end, the present invention provides in one aspect a compression pin for fixing a ligament, comprising: the nail body is long, threads are arranged on the periphery of the nail body, at least two grooves along the length direction of the nail body are further arranged on the periphery of the nail body, and the grooves penetrate through the nail body along the length direction of the nail body.

In the invention, at least two grooves are arranged on the periphery of the extrusion nail, so that the possibility of wire slipping can be eliminated when a doctor uses the assembling tool to twist the extrusion nail, and the operation efficiency of the doctor can be improved. In addition, since the groove penetrates the nail body along the length direction of the nail body, the nail body is advantageous for the discharge of bone fragments when implanted into bone tissue. In addition, bone tissue tends to grow in the recess earlier when growing, and this not only is favorable to bone tissue to find the impetus thereby to promote the restoration of damage position, thereby can also reduce the possibility that the extrusion nail displacement appears with extrusion nail formation interlock structure, can also prevent better that the extrusion nail from becoming flexible.

In addition, in the extruded nail for fixing a ligament according to one aspect of the present invention, optionally, a head connected to the nail body is further included, and the head is tapered. Thereby, the entry of the compression nail into the bone tunnel can be facilitated.

In addition, in the ligament-fixing clip according to the aspect of the present invention, the clip may be at least one selected from the group consisting of medical stainless steel, platinum, titanium alloy, titanium-nickel memory alloy, cobalt-chromium alloy, and magnesium alloy. In this case, by manufacturing the extrusion nail using the above material, the material strength of the extrusion nail can be made high, the fixation is secured, and the possibility of occurrence of the slip and the possibility of displacement in the bone tunnel are reduced.

In addition, in the ligament-fixation clip according to the aspect of the present invention, the material of the clip may be at least one selected from a polylactic acid material, polycaprolactone, polydioxanone, and polyglycolic acid, or at least one selected from a random copolymer or a block copolymer of two or more members selected from lactide, caprolactone, polydioxanone, and glycolide. In this case, by using the absorbable material to manufacture the extrusion nail, not only the occurrence of the secondary operation but also the occurrence of various inconveniences such as the inability to perform nuclear magnetic resonance examination or the occurrence of inflammation such as synovitis, which may be caused by remaining in the body, are prevented.

Further, in a ligament fixation staple in accordance with an aspect of the present invention, optionally, the staple body has a distal end and a proximal end, and the thread has a greater pitch at the distal end than at the proximal end. Therefore, the injury of the screw to the ligament can be reduced, and the fixation of the compression nail in the bone tunnel can be facilitated.

Further, in the ligament anchoring nail according to the aspect of the present invention, the head may be integrally formed with the shank. This can avoid the possibility of separation of the nail head from the nail body, and improve the reliability of the extruded nail.

In addition, in the ligament-fixing clip according to the aspect of the present invention, the clip may further include a through hole penetrating the clip body in the longitudinal direction. In this case, positioning can be performed through the through hole and bone fragments can be easily discharged from the through hole when the jig is used, and the squeeze nail can be easily taken out by injecting lubricating liquid through the through hole when the squeeze nail is taken out.

Further, in the ligament-fixing squeeze nail according to the aspect of the present invention, the thread may be a thread of a thread type. Thereby, the friction between the compression nail and the bone tunnel can be increased.

Further, in a ligament-fixing squeeze nail according to an aspect of the present invention, the crest of the thread may optionally have a chamfer. Therefore, the possibility of secondary damage to the bone tunnel and the ligament caused by the extrusion nail can be reduced.

Further, in a ligament fixation staple according to an aspect of the present invention, the staple body may optionally have a distal end and a proximal end, and the width of the groove at the proximal end may be greater than the width of the groove at the distal end. In this case, the pressing nail can facilitate the discharge of the remaining bone fragments by pressing the bone fragments out of the bone tunnel through the groove during the entrance into the bone tunnel.

Further, in the ligament-fixing squeeze nail according to the aspect of the present invention, the crest of the thread may be a flat top type or a dome type. Therefore, the manufacturing process difficulty of the extrusion nail can be reduced, and cutting damage to the ligament can be avoided.

Furthermore, another aspect of the invention provides a compression nail assembly, characterized by a compression nail for operating any of the above mentioned ligament fixation compression nails. Therefore, the implantation of the extrusion nail can be facilitated.

According to the present invention, there are provided a compression nail capable of suppressing the risk of slippery threads and facilitating the growth of bone tissue, and an assembly tool for operating the compression nail.

Drawings

FIG. 1 is a schematic view showing the use of a ligament anchoring extrusion nail according to an embodiment of the present invention

Fig. 2 is a perspective view showing an angle of a ligament-fixing squeeze pin according to an embodiment of the present invention.

Fig. 3 is a perspective view showing another angle of the ligament-fixing squeeze pin according to the embodiment of the present invention.

Fig. 4 is a plan view showing a ligament-fixing squeeze pin according to an embodiment of the present invention.

Fig. 5 is a perspective sectional view showing a ligament-fixing squeeze pin according to an embodiment of the present invention.

Fig. 6 is a plan sectional view showing a ligament-fixing squeeze pin according to an embodiment of the present invention.

Fig. 7 is a partial schematic view illustrating the pressing nail shown in fig. 6.

Fig. 8 is a plan view showing an extrusion nail according to an embodiment of the present invention.

Fig. 9 is a perspective view showing a press nail attachment according to an embodiment of the present invention.

Fig. 10 is a bottom view showing the press pin attachment according to the embodiment of the present invention.

Fig. 11 is a perspective view illustrating the cooperation of the pressing nail and the assembling tool according to the embodiment of the present invention.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.

It is noted that, as used herein, the terms "comprises," "comprising," or any other variation thereof, such that a process, method, system, article, or apparatus that comprises or has a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include or have other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Cruciate ligament injury is one of the common sports injuries in daily life. For example, the cruciate ligament of knee joint, also known as cruciate ligament, is located between the medial and lateral condyles of femur, with the anterior and posterior two intersecting each other. The anterior cruciate ligament prevents the tibia from moving forwards, is used for connecting the femur and the tibia and is an important structure for maintaining the stability of the knee joint; the posterior cruciate ligament prevents the tibia from shifting posteriorly. The tearing of the cruciate ligaments can directly affect the motor ability of a patient, and improper treatment can cause instability of the knee joint and secondary articular cartilage damage, and finally affect the function of the knee joint.

Fig. 1 is a schematic view showing the use of a ligament-fixing squeeze pin 1 according to an embodiment of the present invention. In the application scenario of the compression pin 1, the compression pin 1 functions as a means for fixing the ligaments of the knee joint for reconstruction of the cruciate ligaments of the knee joint.

In the present embodiment, as shown in fig. 1, when the ligament-fixing compression nail 1 according to the present embodiment is used, the entire compression nail is inserted into a bone tunnel, and the ligament in the bone tunnel is compressed, whereby the ligament is fixed and repaired. The compression nail 1 provided by the invention effectively implants ligaments such as tendons into a bone tunnel, and ensures the healing of the tendons. In addition, by pressing the nail 1, it is possible to prevent the tendon from moving in the bone tunnel and enlarging the tunnel.

The extruded nail 1 according to the present embodiment may be referred to as an interface screw, a bone nail, an interface extruded nail, or the like in the field of orthopedic implantation.

Fig. 2 is a perspective view showing one angle of the ligament-fixing clip 1 according to the present embodiment. Fig. 3 is a perspective view showing another angle of the ligament-fixing clip 1 according to the present embodiment.

In the present embodiment, as shown in fig. 2 and 3, the ligament-fixing clip 1 according to the present embodiment may include a clip body 10. The nail body 10 may be elongated. In some examples, the shank 10 may be cylindrical. The nail body 10 may have a cylindrical shape, a tapered shape, a truncated cone shape, an irregular shape, or the like. Thus, the nail body 10 can be in different shapes according to different application scenes. In general, when using the compression nail 1 for ligament fixation and repair, it is generally first necessary to form a bone tunnel in bone tissue by drilling (e.g., by an electric drill machine). Then, the extrusion nail 1 is implanted into the bone tunnel along the bone tunnel, thereby playing roles in fixing the ligament and repairing. In such a case, it is not generally required that the shank 10 have a pointed head.

In addition, in the present embodiment, the compression nail 1 may further include a nail head connected to the nail body 10. In the case where the extruded nail 1 has a head, the extruded nail 1 may include a shank 10 and a head, and for convenience of explanation, the extruded nail 1 is roughly divided into a shank 10a (i.e., the shank 10) and a head 10b (see fig. 6 described later). Here, the boundary between the shank 10a and the head 10b is not absolute, and is illustrated only schematically in fig. 6.

In some examples, head 10b may be tapered, with the larger diameter side of head 10b being connected to shank 10 a. Thereby, the entry of the compression nail 1 into the bone tunnel can be facilitated.

In other examples, head 10b and shank 10a may be integrally formed. In this case, the head 10b is formed integrally with the shank 10a, whereby the head 10b and the shank 10a can be prevented from being separated from each other during the operation of pressing the nail 1, thereby preventing the possibility of slipping-off of the pressed nail 1 due to the separation.

In addition, in the present embodiment, the material of the extrusion nail 1 may be one or more selected from a polylactic acid material, polycaprolactone, polydioxanone, and polyglycolic acid. In addition, in some examples, the material of the extruded nail 1 may also be selected from one or more of lactide, caprolactone, more than two random copolymers or block copolymers of p-dioxanone and glycolide. Further, in other examples, the extruded nail 1 may be further composed of one or more of Polyorthoesters (POE), polyamphosphine, polycaprolactone, polyester urethane, polyanhydride-imine copolymer, polyhydroxybutyrate and its copolymer, and polyamino acids (PAA).

In the present embodiment, by using the extruded nail 1 made of the above-described material, not only the secondary removal operation can be avoided, but also various inconveniences caused by leaving the metal extruded nail 1 in the body, such as failure of nuclear magnetic resonance examination, or inflammation such as synovitis, etc., can be avoided. In addition, the compression nail 1 made of absorbable material such as polylactic acid (PLA) has an effect of promoting bone tissue healing.

In the present embodiment, the extrusion nail 1 may also be composed of one or more of medical stainless steel, platinum, titanium alloy, titanium-nickel memory alloy, cobalt-chromium alloy, or magnesium alloy. In this case, the pressing nail 1 can also effectively function to fix the ligament. Since the above material is relatively low in price and high in material strength, fixation is firm, and it is more excellent in terms of reducing the possibility of occurrence of sliding and displacement in a bone tunnel, compared with an absorbable material.

Referring to fig. 2, the outer circumference of the shank 10 may have threads. In the present embodiment, the thread provided on the outer periphery of the nail body 10 may be a thread of a thread type. This increases the frictional force between the compression nail 1 and the bone tunnel.

In the present embodiment, the outer periphery of the nail body 10 may be provided with UNR threads. The UNR thread is also a uniform thread with constant pitch at the root of the circular arc.

In some examples, the threads may also be provided as a round root coarse series unified thread (UNRC), a round root fine series unified thread (UNRF), a round root ultra fine series unified thread (UNREF), or a round root special series unified thread (UNRS).

In other examples, the thread may also be a standard coarse huh series, a standard english standard BS84 english thread with 55 angles (b.s.w.) a standard fine huh series, a general purpose cylindrical thread (b.s.f.), an additional optional huh series, a general purpose cylindrical thread (whit.s), a non-standard thread of huh type (Whit), a uniform thread of constant pitch (UN), a uniform thread of coarse series (UNC), a uniform thread of fine series (UNF), a uniform thread of ultra fine series (UNEF), or a uniform thread of special Series (UNs). In this case, different threads can be selected according to different use environments, so that the extrusion nail 1 can be adapted to different application scenarios.

In addition, as shown in fig. 8, in the present embodiment, the nail body 10 may further have a distal end close to the ligament and a proximal end far from the ligament in the length direction. Here, for convenience of explanation, both ends of the nail body 10 are divided into a distal end contacting the tissue or ligament first and a proximal end opposite to the distal end in the order in which the nail body 10 enters the bone tunnel.

In this embodiment, the screw thread provided on the outer periphery of the nail body 10 has a distal thread pitch H1 larger than a proximal thread pitch H2, that is, the distal thread is looser than the proximal thread. In this case, the distal thread is relatively sparse (i.e., the pitch is relatively large) compared to the proximal thread, so that when the nail body 10 is implanted into a bone tunnel, the distal portion of the nail body 10 can reduce damage to ligaments in the bone tunnel, and the proximal portion of the nail body 10 can increase the friction between the compression nail 1 and the bone tunnel, thereby facilitating the compression nail 1 to enter the bone tunnel and be fixed therein.

In addition, as shown in fig. 6 and 7, in the present embodiment, the crest of the thread provided on the outer periphery of the nail body 10 may have a chamfer. In the present embodiment, θ may be equal to the sum of flank angles on both sides of the crest, for example, 30 to 60 °. This reduces the possibility of secondary damage to the bone tunnel and ligaments by the compression pin 1.

In other examples, the chamfer of the crest of the thread provided at the outer periphery of the nail body 10 may be flat-top type or dome type. Therefore, the sharpness of the thread of the extrusion nail 1 can be reduced, and the cutting damage of the extrusion nail 1 to the ligament can be avoided.

In addition, at least two grooves 11 along the length direction of the nail body 10 may be further provided on the outer circumference of the nail body 10. Wherein, the groove 11 can penetrate the nail body 10 along the length direction of the nail body 10.

In some examples, the outer circumference of the nail body 10 may be provided with two (two) or more grooves 11 along the length direction of the nail body 10. In addition, as described above, the groove 11 may also penetrate the nail body 10 along the length direction of the nail body 10, that is, the length of the groove 11 may be substantially equal to the length of the nail body 10. In this case, the generated bone fragments or bone fragments can be easily discharged along the grooves 11 during the implantation of the extrusion nail 1 into, for example, a bone tunnel of bone tissue.

In some examples, the length of the groove 11 may be slightly less than the length of the nail body 10. In addition, the depth of the groove 11 may be smaller than the outer radius of the nail body 10. In some examples, the tack body 10 may also have a distal end proximal to the ligament and a proximal end distal to the ligament along the length. In this case, by deepening the recess 11 of the proximal end, the proximal end is more easily adapted to the mounting tool 2.

In the present embodiment, the grooves 11 (in the present embodiment, the

grooves

11a, 11b, and 11c) may be equiangularly distributed therebetween, for example, in the case where three grooves are provided, the

grooves

11a, 11b, and 11c may be equiangularly distributed. That is, the

grooves

11a, 11b, and 11c may be uniformly distributed along the outer circumference of the nail body 10. In this case, the force of the pressing nail 1 is uniformly applied, and the possibility of occurrence of thread slipping is further reduced.

Furthermore, in other examples, each of the grooves 11 may be distributed at different angles, for example, in the case where three grooves 11 are provided, the

grooves

11a, 11b and 11c may be distributed at different angles. In this case, by providing the grooves 11 at non-equal angles, bone tissue growth can be guided in the direction of the grooves 11, which is more suitable in the case of special requirements for bone tissue growth.

As described above, by providing two or more grooves 11 on the periphery of the extrusion nail 1, the doctor can increase the torque by using the grooves 11 when twisting the extrusion nail 1 by using the assembling tool 2, so that the extrusion nail 1 can be twisted by only a small force, thereby avoiding the possibility of occurrence of the phenomenon of wire slipping due to excessive local stress, and in addition, the operation efficiency of the doctor and other operators can be further improved.

In addition, in the present embodiment, since the groove 11 can penetrate the nail body 10 along the longitudinal direction of the nail body 10, bone tissue grows at the groove 11 first when it grows, which is not only advantageous for the bone tissue to find the point of strength to promote the repair of the damaged portion, but also to form an engagement structure with the compression nail 1 to reduce the possibility of the displacement of the compression nail 1. In addition, the discharge of bone chips or bone dregs is facilitated.

In addition, as described above, the shank 10 may also have a distal end that is proximal to the ligament (or more recently to the ligament) along the length and a proximal end that is distal from the ligament (or later to the ligament). In addition, the width of the groove 11 at the outer periphery of the nail body 10 is larger at the proximal end than the width of the groove 11 at the distal end. In this case, the pressing nail 1 can facilitate the discharge of the remaining bone fragments by pressing the bone fragments out of the bone tunnel through the groove 11 during the entrance into the bone tunnel.

As shown in fig. 4 and 5, in the present embodiment, the compression nail 1 may further include a through hole 12 penetrating the nail body 10 in the longitudinal direction. The through-hole 12 can function as a positioning tool of a later-described fitting of the extrusion nail 1, whereby the through-hole 12 can be easily handled.

In some examples, the through-hole 12 may be a cylindrical through-hole. In other examples, the through-holes 12 may also be triangular, square, irregular, etc. In this case, the range of force applied to the compression nail 1 can be increased by the through-hole 12 when the fitting tool 2 is used, so that the force can be stably applied, bone fragments can be discharged through the through-hole 12, and a positioning function can be performed when the fitting tool 2 is used.

In addition, in some examples, the through hole 12 may further have a communication hole (not shown) communicating with the outer circumference of the nail body 10. This also makes it possible to inject a lubricating fluid into the outer periphery of the nail body 10 through the through-hole 12 when removing the compression nail 1, thereby reducing the frictional force between the compression nail 1 and the bone tunnel and facilitating the removal of the compression nail 1. In some examples, a plurality of communication holes (not shown) may be provided through which the through-holes 12 communicate with the outer circumference of the nail body 10.

Fig. 9 is a perspective view showing a press nail attachment according to an embodiment of the present invention. Fig. 10 is a bottom view showing the press pin attachment according to the embodiment of the present invention. Fig. 11 is a perspective view illustrating the cooperation of the pressing nail and the assembling tool according to the embodiment of the present invention.

Hereinafter, the assembling tool 2 for operating the compression pin 1 for fixing the ligament will be described in detail with reference to fig. 9 to 11.

The mounting tool 2 according to the present embodiment includes: a grip portion 21; two or more legs 22 provided to the grip 21 so as to extend from the grip 21, the legs 22 being capable of being fitted into the grooves 11 of the press stud 1; and positioning posts 23 provided between the legs 22 and fitted into the through holes 12 of the press nails 1. In this case, the assembling tool 2 can embed each part into the corresponding part of the extrusion nail 1 when in use, so as to play the roles of stably bearing force and preventing wire sliding.

When implanting the compression screw 1 into, for example, a bone tunnel, the mounting tool 2 and the compression screw 1 may be first assembled together, wherein the legs 22 and the positioning posts 23 of the mounting tool 2 are inserted into the corresponding positions of the recesses 11 and the through holes 12 of the compression screw 1 (see fig. 11). Next, the fitting tool 2 (specifically, the grip portion 21 of the fitting tool 2) is operated to insert the extrusion pin 1 into a certain position (bone tunnel). The crimp pin 1 can then be pushed into place to a suitable depth by operating (e.g. rotating clockwise) the fitting 2, so that the crimp pin 1 is fixed, for example together with a ligament, in a bone tunnel. Finally, the mounting tool 2 is removed along the groove 11 of the extrusion nail 1.

In the present embodiment, the grip portion 21 may have an elongated shape. Thereby, it is possible to facilitate handling and use. In some examples, the grip 21 may also be spherical, conical, or irregular in shape. This can be applied to a case where different gripping methods are required.

In this embodiment, the legs 22 may be tapered. In this case, the portion of the leg 22 near the grip portion 21 is more stable and is less likely to break when being biased.

In some examples, the feet 22 may also be of uniform size. Therefore, the difficulty of the manufacturing process is reduced.

In this embodiment, the legs 22 may lie on the circumference of the same circle, seen in the longitudinal direction of the legs 22. This allows the structure of the extrusion nail 1 to be fitted.

In the present embodiment, the individual legs 22 may be arranged in an equiangular manner. That is, the individual legs 22 may be evenly distributed over the circumference. This makes it possible to uniformly apply the force to the extrusion nail 1 and prevent the occurrence of the phenomenon of the slipping thread and the breakage of the leg 22.

In the present embodiment, there may be three legs 22 arranged in an equiangular manner. Thereby, a good stability can be obtained with a minimum number of legs 22 used. In other examples, the legs 22 may be non-equiangularly arranged, in which case the position of the legs 22 may be adapted to the particular recess position of the extrusion nail 1 by providing the legs 22 at non-equiangular positions.

In the present embodiment, the grip 21 is integrally formed with the leg 22. This can prevent the occurrence of falling off, breakage, or the like.

In the present embodiment, the handle may be provided in a direction orthogonal to the grip portion 21. Therefore, a better use effect can be obtained during twisting. In addition, in some examples, the handle may penetrate the grip portion 21 in a penetrating manner along the orthogonal direction of the grip portion 21. In other examples, the handle may be connected to the grip portion 21 in a non-penetrating manner. This also makes it possible to provide a portion that is easy to grip when twisting the compression spike 1, so that a better gripping effect is achieved.

In the present embodiment, the length of the leg 22 may be equal to the length of the groove 11 of the pressing nail 1. In this case, the entire extrusion nail 1 can be simultaneously urged, and the possibility of occurrence of breakage of the legs 22 is reduced while enhancing the efficiency of the urging force.

In other examples, the length of the legs 22 may also be less than the length of the groove 11 of the extruded nail 1. In this case, grooves of different lengths can be accommodated.

In the present embodiment, the length of the positioning column 23 may be the same as the length of the through hole 12 of the pressing nail 1. In this case, the positioning post 23 is inserted into the through hole 12 to exert a stable force and prevent the wire from slipping.

In some examples, the length of the positioning post 23 may also be smaller than the length of the through hole 12 of the extrusion nail 1. This allows the through-hole 12 to be adapted to different lengths.

In the present embodiment, the positioning column 23 may be a cylinder. Additionally, in some examples, the positioning post 23 may also be a triangular prism, a rectangular parallelepiped, or a polyhedron. This makes it possible to adapt to different shapes of the through-hole 12 of the staple 1.

While the invention has been specifically described above in connection with the drawings and examples, it will be understood that the above description is not intended to limit the invention in any way. Those skilled in the art can make modifications and variations to the present invention as needed without departing from the true spirit and scope of the invention, and such modifications and variations are within the scope of the invention.

Claims

1. An orthopedic ligament fixation extrusion nail, operable by an assembling tool having a leg, comprising:

a nail body having an elongated shape, the nail body having a thread-shaped thread on an outer periphery thereof, crests of the thread having chamfers for reducing tissue damage, and at least two grooves along a length direction of the nail body being further provided on the outer periphery thereof, the grooves being uniformly distributed along the outer periphery of the nail body, the grooves penetrating the nail body along the length direction thereof, the compression nail further having a through-hole penetrating the nail body along the length direction, the through-hole having a communication hole communicating with the outer periphery of the nail body,

wherein the nail body has a distal end close to the ligament and a proximal end far from the ligament, the thread has a smaller pitch at the proximal end than at the distal end, the groove has a width at the proximal end larger than that at the distal end, the groove has a depth at the proximal end larger than that at the distal end, and lubricating liquid is injected to the periphery of the nail body through the through hole,

when the assembling tool is assembled on the extrusion nail and the support leg is embedded in the groove, the thickness of the support leg is smaller than the depth of the groove, and a gap exists between the support leg and the periphery of the nail body.

2. The extruded nail of claim 1,

the nail head is connected with the nail body, the nail head and the nail body are integrally formed, and the nail head is gradually contracted.

3. The extruded nail of claim 1,

the material of the extrusion nail is at least one of medical stainless steel, platinum, titanium alloy, cobalt-chromium alloy or magnesium alloy.

4. The extruded nail of claim 1,

the material of the extrusion nail is selected from at least one of polylactic acid material, polycaprolactone, polydioxanone or polyglycolic acid, or at least one of more than two random copolymers or block copolymers selected from lactide, caprolactone, polydioxanone or glycolide.

5. An assembling tool for an extrusion nail is characterized in that,

for operating the extruded nail according to any one of claims 1 to 4.