CN217447972U

CN217447972U - Barb type intramedullary pin

Info

Publication number: CN217447972U
Application number: CN202221288847.0U
Authority: CN
Inventors: 司雨; 马长城
Original assignee: Peking University Third Hospital Peking University Third Clinical Medical College
Current assignee: Peking University Third Hospital Peking University Third Clinical Medical College
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-09-20
Anticipated expiration: 2032-05-27

Abstract

The utility model relates to a barb type intramedullary needle belongs to medical device technical field, has solved among the prior art intramedullary needle and has need make a hole once more and fix at long bone both ends, causes the problem of extra wound easily. The utility model discloses an agnail type intramedullary pin, include: the connecting rod, the first barb component and the second barb component; the first barb component and the second barb component are respectively arranged at two ends of the connecting rod; the first barb assembly comprises a plurality of barbed needles, and the axes of the barbed needles and the axes of the connecting rod form an acute angle. The utility model discloses a quick connect to the broken bone is fixed, and need not punch and the outside is fixed.

Description

Barb type intramedullary pin

Technical Field

The utility model relates to the technical field of medical devices, especially, relate to an agnail type intramedullary needle.

Background

For patients with fractures, a common remedy is to use internal fixation of the fracture for fixation. The internal fixation for fracture refers to an operation in which a broken bone is directly connected and fixed in the broken bone by using a metal screw, a steel plate, an intramedullary pin, a steel wire, a bone plate or the like when the fracture occurs.

The main advantage of internal fixation is that it better maintains the anatomical reduction of the fracture, more directly and effectively than simply external fixation, and in particular more effectively in preventing scissor or rotational movement of the fractured ends. In addition, the internal fixation has strong supporting function, and can be used for less or no external fixation after operation, thereby reducing the range and time of external fixation.

The existing intramedullary pin fixation is a fixation mode after long bone fracture, but the intramedullary pin needs to be drilled and fixed again at the two ends of the long bone, and additional trauma is easily caused.

SUMMERY OF THE UTILITY MODEL

In view of the above analysis, the present invention is directed to provide a barb type intramedullary pin, which is used to solve the problem that the conventional intramedullary pin needs to be re-drilled and fixed at both ends of a long bone, which is likely to cause additional trauma.

The purpose of the utility model is mainly realized through the following technical scheme:

a barbed-type intramedullary pin comprising: the connecting rod, the first barb component and the second barb component; the first barb component and the second barb component are respectively arranged at two ends of the connecting rod; the first barb assembly comprises a plurality of barbed needles, and the axes of the barbed needles and the axes of the connecting rod form an acute angle.

Further, the first barb component and the second barb component are identical in structure and are symmetrically arranged.

Further, the first barb assembly comprises a multi-layer barb structure; each layer of barb structure comprises a plurality of barbed needles which are evenly distributed along the circumferential direction of the connecting rod.

Furthermore, the barbed needle is fixedly connected with the connecting rod or is of an integral structure.

Further, the barb structure is umbrella-shaped structure.

Further, the connecting rod is of a split structure.

Furthermore, the connecting rod is of a split structure; the connecting rod includes: first barb installation department, second barb installation department, thin plate portion and fixed rod cover.

Further, the first barb mounting part, the second barb mounting part and the thin plate part are connected into a whole; the first barb mounting part and the second barb mounting part are of cylindrical structures; the thin plate part and the fixed rod sleeve can be spliced into a cylindrical structure.

Further, a rectangular groove is formed in the inner side of the fixing rod sleeve; the rectangular groove can be attached to the outer surface of the thin plate part; the outer surface of the fixed rod sleeve is a cylindrical surface.

Furthermore, the thin plate part is made of flexible and bendable material; the fixed rod sleeve is of a rigid metal structure.

The utility model discloses technical scheme can realize one of following effect at least:

1. the utility model discloses a barb type intramedullary pin structure of both ends barb type, the middle flexible connection metal pole that is, through the broken end of long bone directly fill in both ends marrow intracavity, heavily and realize the simple and convenient fixed of broken end of fracture.

2. The agnail type intramedullary pin of the utility model is provided with a multi-layer agnail structure; in the longitudinal direction, the effective bone grasping is realized through the barb type structure; can prevent bone separation on two sides of the port. In the transverse direction, the rotary displacement of the broken end can be effectively avoided through the design of different directions of the barb.

The utility model discloses in, can also make up each other between the above-mentioned each technical scheme to realize more preferred combination scheme. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.

Fig. 1 is a schematic structural view of a barb-type intramedullary nail according to embodiment 1 of the present invention.

Fig. 2 is a plan view of a barbed intramedullary pin according to example 1 of the present invention;

fig. 3 is a top view of a single-layer barb structure of a barb-type intramedullary pin according to example 2 of the present invention;

fig. 4 is a schematic structural view of a barb-type intramedullary pin according to embodiment 3 of the present invention;

fig. 5 is a fixing rod sleeve of the barb-type intramedullary pin of embodiment 3 of the present invention;

fig. 6 is a schematic view showing a state of use of the barb-type intramedullary pin of the present invention.

Reference numerals:

1-a connecting rod; 2-a first barb assembly; 3-a second barb component;

11-a first barb mount; 12-a second barb mounting section; 13-a lamella portion; 14-fixing the rod sleeve.

Detailed Description

The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of the invention, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit the scope of the invention.

Example 1

A specific embodiment of the present invention, as shown in fig. 1 and 2, discloses a barb type intramedullary pin, comprising: the connecting rod 1, the first barb component 2 and the second barb component 3; the first barb component 2 and the second barb component 3 are respectively arranged at two ends of the connecting rod 1; and, the first barb assembly 2 and the second barb assembly 3 are symmetrically disposed.

During the use, insert first barb subassembly 2 and second barb subassembly 3 inside the marrow cavity of both sides disconnected bone respectively, because the inside unevenness of marrow cavity, during a plurality of barb cards on the barb subassembly go into the local slight recess in marrow cavity for the barb subassembly easily inserts and is difficult to extract, realizes the intramedullary needle through the barb subassembly and the fixed connection between the disconnected bone, and then will cut two disconnected bones and connect as an organic wholely, realize two and cut difficult separation after the disconnected bone is connected.

In a specific embodiment of the present invention, the first barb assembly 2 and the second barb assembly 3 are identical in structure and symmetrically arranged, as shown in fig. 1.

The first barb assembly 2 is illustrated as an example:

specifically, first barb assembly 2 comprises a multi-layer barb structure.

Specifically, as shown in fig. 2, each layer of barb structure is composed of a plurality of barbed needles uniformly distributed along the circumferential direction of the connecting rod 1.

Specifically, the barbed needle is fixedly connected with the connecting rod 1; and the axis of the barbed needle forms an acute angle with the axis of the connecting rod 1.

Preferably, the angle between the barbed needle and the connecting rod 1 is 30-60 °.

As shown in figure 1, each layer of barb structure is developed in an "umbrella shape" along the axial direction of the connecting rod 1.

In use, as shown in figure 6, the first barb assembly 2 and the second barb assembly 3 are inserted into the intramedullary cavity of a fractured bone, the tail ends of the barb pins are stressed to bend inwards to deform when being inserted, and the included angle between the barb pins and the connecting rod 1 is reduced. If the barb assembly is to be extracted from the intramedullary canal, the force required to bend the barb relative to the connecting rod 1 will be greater. Because of the inclined structure of the barbed needle, the barb type intramedullary needle of the utility model is easy to insert and is difficult to extract, and can realize the connection and fixation of broken bones.

Example 2

The utility model discloses a concrete embodiment improves barb type intramedullary pin on the basis of embodiment 1, specifically, as shown in fig. 3: the axis of the barbed needle is arranged obliquely relative to the radial direction of the connecting rod 1, and the oblique directions of two adjacent layers are opposite.

Specifically, the first barb assembly 2 and the second barb assembly 3 are identical in structure and are symmetrically arranged. The first barb assembly 2 comprises a multi-layer barb structure; each layer of barb structure consists of a plurality of barbed needles which are evenly distributed along the circumferential direction of the connecting rod 1.

Further, the barbed needles of each layer of barb structures are offset to one side, as shown in FIG. 3.

Specifically, as shown in fig. 3, the projection of the axial direction of the barbed needle on the cross section of the connecting rod 1 forms an acute angle with the radial direction (i.e., the radial direction) of the connecting rod 1.

Specifically, the deflection directions of the barb structures of every two adjacent layers are opposite.

Example 3

The present invention provides a specific embodiment, which is an improvement of the barb type intramedullary pin based on embodiment 1 or embodiment 2, specifically, as shown in fig. 4 and 5.

In order to facilitate the installation of realizing the intramedullary needle in the broken bone of both sides, the barb type intramedullary needle of this embodiment sets up connecting rod 1 into components of a whole that can function independently structure, includes: a first barbed mounting portion 11, a second barbed mounting portion 12, a thin plate portion 13, and a fixed rod cover 14.

Wherein, the first barb mounting part 11, the second barb mounting part 12 and the thin plate part 13 are connected into a whole; the first barb mounting part 11 and the second barb mounting part 12 are cylindrical structures.

Furthermore, the thin plate part 13 is made of flexible and bendable material; the fixation rod sleeve 14 is a rigid metal structure.

Further, the two ends of the connecting rod 1 are of cylindrical structures, and barb structures are arranged on the outer sides of the cylinders. The middle part of the connecting rod 1 is a thin plate part 13.

Specifically, as shown in fig. 4 and 5, the inner side of the fixing rod sleeve 14 is a rectangular groove; the rectangular groove can be fitted to the outer surface of the thin plate portion 13.

Specifically, as shown in fig. 5, the outer portion of the fixing rod sleeve 14 is a circular arc surface; the arc surface is superposed with the cylindrical sections at the two ends of the connecting rod 1; i.e. the circular arc surface of the fixation rod sleeve 14 is the same as the diameter of the outer cylindrical surface of the first barb mounting part 11 and the second barb mounting part 12.

When in use, the thin plate part 13 can be bent, so that the first barb component 2 and the second barb component 3 on two sides can be conveniently inserted into the marrow cavity of a broken bone; after the first barb component 2 and the second barb component 3 are inserted into the fractured bone, straightening the thin plate part 13, and sleeving a fixing rod sleeve 14 on the outer side of the thin plate part 13 for reinforcement; after reinforcement, the broken bones at the two sides are jointed; after the both-side fractured bone is jointed, the cylindrical structure composed of the thin plate part 13 and the fixing rod cover 14 is also inserted into the medullary cavity of the fractured bone, as shown in fig. 6.

The barb type intramedullary pin of the embodiment realizes the flexible design of the connecting rod 1, is convenient for inserting barb structures at two sides into a medullary cavity, and is provided with the fixing rod sleeve 14 for reinforcing the thin plate part 13 of the connecting rod 1, thereby ensuring the rigidity of the intramedullary pin and avoiding the bending of a broken bone fracture part after the connection; the connection reliability is improved, and the rehabilitation of the patient is facilitated.

Compared with the prior art, the embodiment has at least one of the following beneficial effects:

1. the barb type intramedullary pin of the utility model can realize effective fixation of fracture parts by adopting the fixation method of the invention for the parts with low load requirement such as humerus and the groups with low load such as infants. The fixing between the intramedullary pin and the broken bone is realized by adopting the barbs in different directions, thereby avoiding punching on the bone when the intramedullary pin is fixed and avoiding the secondary damage to the broken bone.

2. The utility model discloses an barb type intramedullary pin, accessible barb structure are connected the broken bone at both ends fixedly, have realized promptly fixedly after the intramedullary pin installation is accomplished, have saved the fixed step to intramedullary pin, have practiced thrift treatment time, and only install in the marrow, need not to set up fixed knot at the broken bone outside and construct, have promoted patient's treatment impression, are favorable to patient's quick recovery.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims

1. A barb-type intramedullary pin, comprising: the connecting rod (1), the first barb component (2) and the second barb component (3); the first barb component (2) and the second barb component (3) are respectively arranged at two ends of the connecting rod (1); the first barb component (2) comprises a plurality of barbed needles, and the axes of the barbed needles and the axes of the connecting rod (1) form an acute angle.

2. The barbed intramedullary pin according to claim 1, wherein the first barb assembly (2) and the second barb assembly (3) are identical in structure and are symmetrically arranged.

3. The barbed intramedullary pin according to claim 2, wherein the first barb assembly (2) is a multi-layer barb structure; each layer of barb structure comprises a plurality of barbed needles which are uniformly distributed along the circumferential direction of the connecting rod (1).

4. The barbed intramedullary pin according to claim 3, wherein the barbed needle is fixedly connected to the connecting rod (1) or is an integral structure.

5. The barbed intramedullary pin according to claim 4, wherein the barbed structure is an umbrella structure.

6. The barbed intramedullary pin according to claim 5, wherein the connecting rod (1) is a split structure.

7. The barbed intramedullary pin according to claim 6, wherein the connecting rod (1) comprises: a first barb mounting part (11), a second barb mounting part (12), a thin plate part (13) and a fixed rod sleeve (14).

8. The barbed intramedullary pin according to claim 7, wherein the first barbed mounting portion (11), the second barbed mounting portion (12) and the thin plate portion (13) are integrally connected; the first barb mounting part (11) and the second barb mounting part (12) are of cylindrical structures; the thin plate part (13) and the fixed rod sleeve (14) can be spliced into a cylindrical structure.

9. The barbed intramedullary pin according to claim 8, wherein a rectangular groove is provided on the inner side of the fixing stem sleeve (14); the rectangular groove can be attached to the outer surface of the thin plate part (13); the outer surface of the fixed rod sleeve (14) is a cylindrical surface.

10. The barbed intramedullary pin according to any one of claims 7 to 9, wherein the fixation rod sleeve (14) is a rigid metal structure.