CN215306599U

CN215306599U - Interlocking bone nail

Info

Publication number: CN215306599U
Application number: CN202121765234.7U
Authority: CN
Inventors: 姚力军; 张桐滨; 诸楠; 何强龙; 张茜垚; 王凌
Original assignee: Ningbo Zhaoying Medical Instrument Co ltd
Current assignee: Ningbo Zhaoying Medical Instrument Co ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-12-28
Anticipated expiration: 2031-07-30

Abstract

The utility model provides an interlocking bone nail, which comprises a main nail and a sub-nail, wherein the main nail is divided into a head part and a threaded part along the length direction, the head part is obliquely penetrated and provided with an interlocking hole, and the sub-nail is inserted into the interlocking hole; the surface of one side of the head part, which is far away from the thread part, is a screwing surface, and the screwing surface is inclined to the length direction of the main nail. According to the utility model, the interlocking holes are formed, the sub-nails are inserted into the interlocking holes, the two screws are matched for use, the re-opening positioning is not needed, the operation time is reduced, the wound area is reduced, the healing of the fracture is facilitated, the holding force of the screws on the bone is increased, the tail parts of the screws are made into the shape of an inclined plane, the bone surface is better attached, the cutting marks of the screws are reduced, the soft tissues around the irritation of a patient are reduced, and the utility model has the characteristics of simple structure, convenience in implementation, low cost and the like.

Description

Interlocking bone nail

Technical Field

The utility model belongs to the technical field of bone nails, and particularly relates to an interlocking bone nail.

Background

Because the calcaneal distance joint surface is narrow, the surface is uneven and is shielded by a lateral malleolus, the wide incision method is difficult to effectively expose the calcaneal back joint surface, the bone fracture by using the reset hollow screw has higher screw incisional trace, and the multi-section fracture screw is not connected after being implanted, so that the holding force on the fracture block is insufficient after being implanted, and the stability of the fracture part is influenced.

Calcaneal fracture is an orthopedic disease with high incidence rate, and is mainly caused by axial stress injury caused by high-fall. And relevant investigation results show that the closed fracture accounts for 98%, the bilateral calcaneus fracture accounts for about 10%, and a calcaneus fracture patient exceeding 3/4 belongs to intra-articular fracture, so that the joint surface of the patient is usually damaged, heel pain may be caused if the patient is not effectively treated, the normal walking function is influenced, and the life quality of the patient is greatly influenced.

The fixing product in the prior art is in a short thread shape, the thread pitch of the head part is large, the thread pitch of the tail part is small, and the fixing product can generate a pressurizing effect in the process of being implanted into a fracture end. And all the components are used independently, and when the calcaneus is fractured in multiple sections, the openings are required to be repositioned after one screw is driven, so that the operation time is increased, and the wound area is increased. The head of the screw is usually conical, and after bone grafting, a part of the head of the screw exceeds the bone surface.

CN202113159U discloses a novel bone pin, its scheme is: an axial hole is arranged in the hexagonal nut and the screw rod, an inner screw rod is arranged in the axial hole, the tail end of the inner screw rod is connected with the oblique insertion rod through a connecting rod, and a through hole is formed in the screw rod. The utility model discloses a because it has oblique inserted bar, increased the friction resistance nature of coaptation nail to sclerotin, improved the fixed effect of steel sheet, in withdrawing the screw rod with oblique inserted bar earlier during the dismantlement, reduced the friction resistance nature of coaptation nail and sclerotin, can be easily will fix taking out, its is rational in infrastructure, convenient to use to it is convenient to have brought for medical work.

CN213697156U discloses an anti-slip metal bone screw, which comprises a screw body, wherein a nut is arranged at the top end of the screw body, the screw body is divided into an upper section, a middle section and a lower section, first threads are arranged on the side surfaces of the upper section and the lower section of the screw body, the first threads are fine threads, second threads are arranged on the side surface of the middle section of the screw body, the second threads are coarse threads, a screw tip is arranged at the bottom of the screw body, third threads are arranged on the side surface of the nut, the third threads are fine threads, the first threads, the second threads and the third threads are connected end to end, and a screw groove is arranged at the top of the nut; the utility model discloses a divide into the screw rod body upper and middle, lower three-section and set up the screw thread respectively, and set up thin screw thread at screw rod body upper segment and hypomere, increase area of contact, increase and control power, set up thick screw thread in screw rod body middle section, increase withdrawal force, it is poor to have solved the intensity of current bone screw fixation on the bone, grabs the unstable problem of power.

The existing bone nails have the problems of complex structure, difficult implementation, high cost and the like, so that the problem that how to reduce the operation time and the injury to soft tissues of patients under the condition of ensuring that the bone nails have simple structures becomes the problem which needs to be solved urgently at present.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide an interlocking bone nail, wherein a sub-nail is inserted into a main nail through an interlocking hole, so that the operation opening is reduced, the operation time is reduced, and the screwing surface is obliquely arranged, so that the implanted bone nail is more attached to the bone surface, the injury to the soft tissue of a patient is reduced, and the interlocking bone nail has the characteristics of simple structure, convenience in implementation, low cost and the like.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides an interlocking bone nail, which comprises a main nail and a sub-nail, wherein the main nail is divided into a head part and a threaded part along the length direction, the head part is obliquely penetrated and provided with an interlocking hole, and the sub-nail is inserted into the interlocking hole; the surface of one side of the head part, which is far away from the thread part, is a screwing surface, and the screwing surface is inclined to the length direction of the main nail.

According to the utility model, the interlocking holes are formed, the sub-nails are inserted into the interlocking holes, the two screws are matched for use, the re-opening positioning is not needed, the operation time is reduced, the wound area is reduced, the healing of the fracture is facilitated, the holding force of the screws on the bone is increased, the tail parts of the screws are made into the shape of an inclined plane, the bone surface is better attached, the cutting marks of the screws are reduced, the soft tissues around the irritation of a patient are reduced, and the utility model has the characteristics of simple structure, convenience in implementation, low cost and the like.

In a preferred embodiment of the present invention, an angle between the engagement surface and the longitudinal direction of the main nail is 10 ° to 30 °, for example, 10 °, 12 °, 14 °, 16 °, 18 °, 20 °, 22 °, 24 °, 26 °, 28 °, or 30 °, but is not limited to the above-mentioned numerical values, and other numerical values not mentioned in the numerical value range are also applicable.

In a preferred embodiment of the present invention, the side surface of the head portion is provided with a thread, and the pitch of the thread of the head portion is the same as the pitch of the thread of the threaded portion.

According to the utility model, the thread pitch of the head part is the same as that of the thread part, so that the bone nail is not pressurized again when the head part is implanted, and the bone nail is further stabilized through the sub-nail, and the stability is high.

In a preferred embodiment of the present invention, the pitch of the thread of the head is 0.5 to 2.75mm, for example, 0.50mm, 0.55mm, 0.60mm, 0.65mm, 0.70mm, 0.75mm, 0.80mm, 0.85mm, 0.90mm, 0.95mm, 1.00mm, 1.20mm, 1.40mm, 1.60mm, 1.80mm, 2.00mm, 2.20mm, 2.40mm, 2.60mm or 2.75mm, but is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned range are also applicable.

As a preferable technical scheme of the utility model, the main nail is provided with a central through hole along the length direction in a penetrating way.

The utility model can be used in cooperation with various instruments such as a Kirschner wire, a guider, a bone drill, an orthopedic screwdriver and the like by arranging the central hole, thereby improving the practicability of the bone nail.

In a preferred embodiment of the present invention, the diameter of the central through hole is 0.9 to 2.6mm, for example, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm or 2.6mm, but is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned range are also applicable.

As a preferable technical scheme of the utility model, the interlocking hole is internally provided with a thread matched with the sub-nail.

According to the utility model, the matched threads of the sub-nail are arranged in the interlocking hole, so that the stability of the sub-nail during implantation can be improved.

As a preferred embodiment of the present invention, an included angle between the axial direction of the interlocking hole and the axial direction of the main nail is 30 ° to 60 °, for example, 30 °, 32 °, 34 °, 36 °, 38 °, 40 °, 42 °, 44 °, 46 °, 48 °, 50 °, 52 °, 54 °, 56 °, 58 °, or 60 °, but is not limited to the enumerated values, and other unrecited values within the numerical range are also applicable.

As a preferred technical scheme of the utility model, a counter bore structure is arranged at the sub-nail insertion end of the interlocking hole, and the counter bore structure is matched with the head of the sub-nail.

According to the utility model, by arranging the counter bore structure, after the sub-nail is completely screwed in, the head part of the sub-nail can sink into the counter bore structure, so that the wound surface is reduced.

As a preferable technical scheme of the utility model, the material of the interlocking bone nail is titanium alloy.

Exemplarily, a method for using the interlocking bone nail is provided, which specifically comprises the following steps:

the screw thread part of the interlocking type fixing is screwed into the bone tissue, and then the sub-nail is screwed in through the interlocking hole for fixing.

The recitation of numerical ranges herein includes not only the above-recited numerical values, but also any numerical values between non-recited numerical ranges, and is not intended to be exhaustive or to limit the utility model to the precise numerical values encompassed within the range for brevity and clarity.

Compared with the prior art, the utility model has the beneficial effects that:

Drawings

FIG. 1 is a schematic structural view of an interlocking bone screw according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a primary staple provided in one embodiment of the present invention;

fig. 3 is a schematic view of a sub-staple structure provided in an embodiment of the present invention.

Wherein, 1-main nail; 2-sub-nail; 3-rolling and kneading; 4-interlocking holes; 5-central through hole.

Detailed Description

It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention.

It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "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 by those of ordinary skill in the art through specific situations.

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

In a specific embodiment, the present invention provides an interlocking bone nail, as shown in fig. 1, 2 and 3, the interlocking bone nail comprises a main nail 1 and a sub-nail 2, wherein the main nail 1 is divided into a head part and a threaded part along a length direction, the head part is obliquely provided with an interlocking hole 4 in a penetrating manner, and the sub-nail 2 is inserted into the interlocking hole 4; the surface of one side of the head part far away from the thread part is a screwing surface 3, and the screwing surface 3 is inclined to the length direction of the main nail 1.

According to the utility model, the interlocking hole 4 is arranged, the sub-nail 2 is inserted into the interlocking hole 4, the two screws are matched for use, the re-opening positioning is not needed, the operation time is reduced, the wound area is reduced, the healing of the fracture is facilitated, the holding force of the screws to the bone is increased, the tail parts of the screws are made into the shape of an inclined plane, the bone surface is better attached, the cutting mark of the screws is reduced, the irritation of the soft tissues around the patient is reduced, and the utility model has the characteristics of simple structure, convenience in implementation, low cost and the like.

Furthermore, the included angle between the screwing surface 3 and the length direction of the main nail 1 is 10-30 degrees.

Further, the side of the head portion is provided with threads, and the thread pitch of the head portion is the same as the thread pitch of the threaded portion. The utility model sets the thread pitch of the head part and the thread pitch of the thread part to be the same, so that the bone nail is not pressurized again when the head part is implanted, but the sub-nail 2 is used for further stabilizing and has high stability.

Furthermore, the thread pitch of the head is 0.5-2.75 mm.

Further, the main nail 1 is provided with a central through hole 5 along the length direction. The utility model can be used in cooperation with various instruments such as a Kirschner wire, a guider, a bone drill, an orthopedic screwdriver and the like by arranging the central hole, thereby improving the practicability of the bone nail.

Furthermore, the diameter of the central through hole 5 is 0.9-2.6 mm.

Further, a thread matched with the sub-nail 2 is arranged in the interlocking hole 4. According to the utility model, the matched threads of the sub-nail 2 are arranged in the interlocking hole 4, so that the stability of the sub-nail 2 during implantation can be improved.

Further, the included angle between the axial direction of the interlocking hole 4 and the axial direction of the main nail 1 is 30-60 degrees.

Furthermore, a counter bore structure is arranged at the inserting end of the sub nail 2 of the interlocking hole 4, and the counter bore structure is matched with the head of the sub nail 2. According to the utility model, by arranging the counter bore structure, after the sub-nail 2 is completely screwed in, the head part of the sub-nail can sink into the counter bore structure, so that the wound surface is reduced.

Furthermore, the material of the interlocking bone nail is titanium alloy.

the screw thread part of the interlocking type fixation is screwed into the bone tissue, and then the sub-nail 2 is screwed in through the interlocking hole 4 for fixation.

Example 1

The embodiment provides an interlocking type bone nail, based on a specific implementation mode, wherein, revolve the closed surface 3 with the length direction's of main nail 1 contained angle is 20, and the screw thread interval of head is 1.5mm, and the diameter of central through-hole 5 is 1.5mm, the axial direction of interlocking hole 4 with the axial direction's of main nail 1 contained angle is 45.

Example 2

The embodiment provides an interlocking type bone nail, based on a specific implementation mode, wherein, the screw surface 3 with the length direction's of main nail 1 contained angle is 10, and the screw thread interval of head is 0.5mm, and the diameter of central through-hole 5 is 0.9mm, the axial direction of interlocking hole 4 with the axial direction's of main nail 1 contained angle is 30.

Example 3

The embodiment provides an interlocking type bone nail, based on a specific implementation mode, wherein, the screw surface 3 with the length direction's of main nail 1 contained angle is 30, and the screw thread interval of head is 2.75mm, and the diameter of central through-hole 5 is 2.6mm, the axial direction of interlocking hole 4 with the axial direction's of main nail 1 contained angle is 60.

Through the embodiment, the interlocking holes 4 are formed, the sub-nails 2 are inserted into the interlocking holes 4, the two screws are matched for use, the re-opening positioning is not needed, the operation time is reduced, the wound area is reduced, the healing of the fracture is facilitated, the holding force of bone between the screws is increased, the tail parts of the screws are made into the shape of an inclined plane, the bone surfaces are attached, the cutting marks of the screws are reduced, the soft tissues around the irritation of a patient are reduced, and the bone fracture plate has the characteristics of simple structure, convenience in implementation, low cost and the like.

The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims

1. The interlocking bone nail is characterized by comprising a main nail and a sub-nail, wherein the main nail is divided into a head part and a threaded part along the length direction, an interlocking hole is obliquely formed in the head part in a penetrating mode, and the sub-nail is inserted into the interlocking hole;

the surface of one side of the head part, which is far away from the thread part, is a screwing surface, and the screwing surface is inclined to the length direction of the main nail.

2. An interlocking bone screw according to claim 1, characterised in that the angle between the screwing surface and the length direction of the main screw is between 10 ° and 30 °.

3. An interlocking bone screw as claimed in claim 1, wherein the head portion is provided with threads on its side surface, the pitch of the threads of the head portion being the same as the pitch of the threads of the threaded portion.

4. The interlocking bone screw of claim 3, wherein the head has a thread pitch of 0.5 to 2.75 mm.

5. The interlocking bone screw of claim 1 wherein the primary screw has a central through hole extending therethrough in the length direction.

6. An interlocking bone screw according to claim 5, characterised in that the diameter of the central through hole is 0.9-2.6 mm.

7. The interlocking bone screw of claim 1 wherein the interlocking holes are threaded to mate with the sub-screws.

8. An interlocking bone screw according to claim 1, characterised in that the angle between the axial direction of the interlocking hole and the axial direction of the main screw is between 30 ° and 60 °.

9. The interlocking bone nail according to claim 1, wherein the sub-nail insertion end of the interlocking hole is provided with a counter-bore structure, and the counter-bore structure is matched with the head of the sub-nail.

10. The interlocking bone screw of claim 1, wherein the interlocking bone screw is made of a titanium alloy.