CN215129869U

CN215129869U - Medical bone nail

Info

Publication number: CN215129869U
Application number: CN202121588959.3U
Authority: CN
Inventors: 王建超; 王振国; 张星燕; 潘超; 程曦; 刘伟; 王晶; 李敬一; 马宇航; 王亮
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2021-07-13
Filing date: 2021-07-13
Publication date: 2021-12-14
Anticipated expiration: 2031-07-13

Abstract

The utility model provides a medical bone nail, include: the nail comprises a nail cap, a nail rod and a nail head which are sequentially connected from top to bottom, wherein the nail rod comprises a main rod, a bone trabecular structure, a root part and a thread tip, and the bone trabecular structure is coated along the outer surface of the main rod; the root parts are arranged at equal intervals along the longitudinal direction of the main rod, and one root part is correspondingly connected with one thread tip so that the thread tips form threads on the main rod; wherein the inner side and the outer side of the root part are respectively connected with the bone trabecula structure and the screw tooth tip; the tip of the main rod and the tip of the screw thread are both solid structures. The advantages are that: the soft tissue infiltration and firm attachment is realized, the high load bearing strength and the low elastic modulus are realized, and the stress shielding is minimized under the condition of physiological load bearing.

Description

Medical bone nail

Technical Field

The utility model belongs to the technical field of the medical instrument technique and specifically relates to medical bone nail.

Background

The bone nail is a commonly used bone fixing device in orthopedic surgery, and can fix devices such as a fixing plate, a connecting plate and the like on bones, so that the bone nail is convenient for treating orthopedic diseases such as fracture, bone deformation and the like.

Requirements for medical implants are: (1) the biocompatibility is good; (2) bone tissue ingrowth or dissociation can be achieved in vivo; (3) the implant structure is similar to human bone; (4) has good biomechanical property; (5) good corrosion resistance.

Some medical bone nails at present have poor biocompatibility and mechanical compatibility all the time, some can not realize bone ingrowth and bone fusion, some mechanical properties are not good, for example, the elastic modulus is low, the torsional strength is low, the fracture is easy to occur in implantation and follow-up processes, the elastic modulus of some bone nails and human bones is not matched to cause the stress shielding phenomenon, so that the bone nails are loosened, and great pain is caused to patients.

SUMMERY OF THE UTILITY MODEL

The utility model provides a medical bone nail, the purpose is to overcome above-mentioned technical defect at least for strengthen its mechanical properties when doing benefit to the bone and growing into.

In order to realize the purpose of the utility model, the utility model provides a following technical scheme:

a medical bone nail, comprising: the nail cap, the nail rod and the nail head are sequentially connected from top to bottom; the screw rod comprises a main rod, a bone trabecula structure, a root and a thread tip, wherein the bone trabecula structure is coated along the outer surface of the main rod; the root parts are arranged at equal intervals along the longitudinal direction of the main rod, and one root part is correspondingly connected with one thread tip so that the thread tips form threads on the main rod;

wherein the inner side and the outer side of the root part are respectively connected with the bone trabecula structure and the screw tooth tip; the tip of the main rod and the tip of the screw thread are both solid structures.

Preferably, the root is a solid structure or a porous structure.

Preferably, the bone trabecular structure has a porosity of 50-80%, a filament diameter of 400 μm and a pore size of 100-400 μm.

Preferably, the porosity of the pore structure is 50% -80%, the filament diameter is 400 μm, and the pore size is 100 μm-400 μm.

The utility model discloses a medical bone nail, its advantage is: the novel bone nail has the advantages that the outer surface of the novel bone nail is a porous bone trabecula structure which is very similar to a cancellous bone structure, so that bone induction is facilitated, soft tissues can be rapidly and widely infiltrated and firmly attached, and the novel bone nail has high load intensity and low elastic modulus, so that stress shielding is minimized under physiological load conditions; and the tip of the main rod and the tip of the screw thread are solid structures, and have the physical characteristics, mechanical properties and cutting function of the common bone nail.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. In the drawings:

FIG. 1 is a schematic longitudinal sectional view of a medical bone screw according to a second embodiment;

FIG. 2 is a schematic cross-sectional view of a portion of a medical bone screw according to a second embodiment;

FIG. 3 is a longitudinal sectional view of the medical bone screw according to the third embodiment;

FIG. 4 is a schematic cross-sectional view of a portion of a medical bone screw according to a third embodiment;

FIG. 5 is a longitudinal sectional view schematically illustrating a medical bone screw according to a fourth embodiment;

FIG. 6 is a schematic cross-sectional view of a portion of a medical bone screw according to a fourth embodiment;

FIG. 7 is a longitudinal sectional view schematically illustrating a medical bone screw according to a fifth embodiment;

FIG. 8 is a schematic cross-sectional view of a portion of a medical bone screw, as provided in example five;

wherein:

a nail cap 1;

the nail rod 2, the main rod 21, the trabecular bone structure 22, the root 23 and the thread tip 24;

a nail head 3.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a number" is two or more unless specifically limited otherwise.

Example one

The purpose of this embodiment is to provide medical bone nail, from last to the head of a nail 1, nail pole 2, the pin fin 3 that connects gradually down, its characterized in that: the nail rod 2 comprises a main rod 21, a bone trabecular structure 22, a root 23 and a thread tip 24, wherein the bone trabecular structure 22 is coated along the outer surface of the main rod 21; the root portions 23 are arranged at equal intervals along the longitudinal direction of the main rod 21, and one root portion 23 is correspondingly connected with one thread tip 24, so that the thread tips 24 form threads on the main rod 21;

wherein the inner side and the outer side of the root 23 are respectively connected with the bone trabecula structure 22 and the thread tip 24; the main rod 21 and the thread tip 24 are both solid structures.

The technical effect of the technical scheme is as follows: the outer surface of the main rod 21 is coated with the bone trabecular structure 22, so that in the use process of the bone nail, because the surface-coated bone trabecular structure 22 is similar to a spongy or cortical bone structure, the bone nail is beneficial to the occurrence of bone induction, can quickly infiltrate and firmly adhere soft tissues, and has high load intensity and low elastic modulus, thereby allowing the stress shielding to be minimized under physiological load conditions.

Example two

According to the medical bone nail of the first embodiment, as shown in fig. 1 and 2, the bone nail is a half-thread locking screw and is formed by 3D printing, the root portion 23 is a pore structure, the porosity of the bone trabecular structure 22 and the porosity of the pore structure are both 55%, the wire diameter is both 400 μm, and the pore size is both 100 μm; further promoting the occurrence of osteoinduction and shortening the bone fusion time;

further, the root portion 23 may be a trabecular bone structure.

EXAMPLE III

According to the medical bone nail of the first embodiment, as shown in fig. 3 and 4, the bone nail is a half-thread locking screw and is formed by 3D printing; the root 23 is a solid structure, the porosity of the trabecular bone structure 22 is 60%, the silk diameter is 400 microns, and the pore size is 200 microns, so that the occurrence of osteoinduction is further promoted, and the bone fusion time is shortened;

in this embodiment, the root 23, the main rod 21 and the thread tip 24 are preferably made of the same material, and the root 23 and the thread tip 24 are integrally formed.

Example four

According to the first embodiment of the medical bone nail, as shown in fig. 5 and 6, the bone nail is a cortical bone screw and is formed by 3D printing; the root part 23 is a pore structure, the porosity of the bone trabecula structure 22 and the porosity of the pore structure are both 70%, the silk diameter is 400 micrometers, the pore size is 100 micrometers, the occurrence of osteoinduction is further promoted, and the bone fusion time is shortened;

further, the root portion 23 may be a trabecular bone structure.

EXAMPLE five

According to the first embodiment of the medical bone nail, as shown in fig. 7 and 8, the bone nail is a cortical bone screw and is formed by 3D printing; the root 23 is a solid structure, the porosity of the trabecular bone structure 22 is 75%, the silk diameter is 400 microns, and the pore size is 200 microns, so that the occurrence of osteoinduction is further promoted, and the bone fusion time is shortened;

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. Medical bone nail includes from last to down nail cap (1), nail pole (2), pin fin (3) that connect gradually, its characterized in that: the nail rod (2) comprises a main rod (21), a bone trabecula structure (22), a root (23) and a thread tip (24), wherein the bone trabecula structure (22) is coated along the outer surface of the main rod (21); the root parts (23) are arranged at equal intervals along the longitudinal direction of the main rod (21), and one root part (23) is correspondingly connected with one thread tip (24), so that the thread tips (24) form threads on the main rod (21);

wherein the inner side and the outer side of the root (23) are respectively connected with the bone trabecula structure (22) and the thread tip (24); the main rod (21) and the thread tip (24) are both solid structures.

2. The medical bone screw of claim 1, wherein: the root portion (23) is of a solid structure or a porous structure.

3. The medical bone screw of claim 1, wherein: the bone trabecular structure (22) has a porosity of 50-80%, a filament diameter of 400 μm, and a pore size of 100-400 μm.

4. The medical bone screw of claim 2, wherein: the porosity of the pore structure is 50-80%, the filament diameter is 400 μm, and the pore size is 100-400 μm.