JPH05154189A - Bioimplanting material for medical treatment - Google Patents

Abstract

PURPOSE:To eliminate the possibility that a metallic blank material molded to a prescribed shape is corroded or adversely affects a living body by forming an amorphous diamond-like carbon film on the surface of the metallic blank material. CONSTITUTION:A clip 1 as a medical treating material A is constituted by cutting a metal, such as stainless steel, titanium or tantalum, formed to a plate shape to a prescribed length and bending this metal. The extremely thin DLC film of about 1mum thickness is formed on the surface of the medical treating material A. The DLC film is used to form the diamond-like carbon film on the surface of the metallic blank material by decomposing hydrocarbon in plasma and is formed by having high adhesive strength over the entire surface of the medical treating material A. Even if, therefore, the DLC film is immersed into the bodily fluid, there is no possibility that the bodily fluid permeates the DLC film and comes into contact with the metal and there is no possibility that the living body is adversely affected by the metal. In addition, there is no possibility that the DCL film adversely affects the biotissue even if the DLC film comes into contact with the biotissue.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biomedical implant material for medical use which is assumed to be embedded in a living body when a medical operation is performed.

[0002]

2. Description of the Related Art In a medical operation, microscopic blood vessels are occluded to stop bleeding, and living tissues such as bones, muscles and organs are sutured. The material used for occluding a blood vessel or suturing a living tissue is embedded in a living body, and conventionally a suture has been generally used. Recently, a clip made of metal such as stainless steel, tantalum, titanium, etc. to occlude a blood vessel (Japanese Patent Publication No. 55-40256).
, And staples made of stainless steel are used for suturing living tissue (Japanese Patent Laid-Open No. 121645/1990). The time required for surgery is greatly shortened by using the medical investment material such as the clips and staples.

[0003]

Metals such as stainless steel, tantalum, and titanium are used in the above-mentioned conventional medical implant materials such as clips and staples. That is, the metal is buried in the living body in such a state that the metal is always in contact with the living tissue or the body fluid to influence each other. Therefore, even stainless steel may be corroded by body fluid. Further, since tantalum is a heavy metal, it may adversely affect a living body, and when computer tomography is performed during diagnosis, there is a problem that a streak phenomenon occurs. Furthermore, titanium, which is said to have high biocompatibility, may be accumulated in the body in the form of fine-grained titanium or in the state of titanium oxide, and the accumulated titanium may stain the living tissue.

An object of the present invention is to provide a biomedical implant material for medical use such as clips and staples which are chemically stable and have a highly biocompatible film formed thereon.

[0005]

Means for Solving the Problems In order to solve the above problems, a biomedical implantable material according to the present invention is a medical implantable material that is implanted in a living body after the completion of medical surgery and is formed into a predetermined shape. It is configured by forming an amorphous diamond-like carbon film on the surface of a metal material.

[0006]

With the above-mentioned biomedical implant material for medical use, there is no risk of corrosion of the metal or adverse effect on the organism even if it is buried in the organism after the operation. That is, an amorphous diamond-like carbon (hereinafter referred to as "DLC") film is formed on the surface of a metal material formed into a predetermined shape, and a biomedical implantable material for medical use such as clips or staples (hereinafter referred to as "medical Since the medical material is embedded in the living body after the operation is completed, the metal as the material of the medical material does not come into direct contact with body fluid or living tissue. The DLC film is a diamond-like amorphous film, which is chemically stable and is formed as a smooth film along the surface of the metal material. Therefore, DLC
Even if the membrane is immersed in body fluid, there is no risk that this body fluid will penetrate the DLC membrane and come into contact with the metal, and there will be no possibility that the metal will adversely affect the living body. Further, even if the DLC film comes into contact with the living tissue, there is no possibility that the DLC film will adversely affect the living tissue.

[0007]

EXAMPLES Examples of medical materials will be described below with reference to the drawings. 1 is a perspective view of a clip, and FIG. 2 is a perspective view of a staple. In the medical material A according to the present invention, by covering the surface of a metal material molded into a predetermined shape with a DLC film, the metal material may adversely affect the living body even if the medical material is buried in the living body. There is no such thing.

FIG. 1 shows a clip 1 as a medical material A. This clip 1 has a function of blocking the terminal of a blood vessel that has been cut during an in-vivo operation to stop bleeding. The clip 1 is formed by cutting a plate-shaped metal such as stainless steel, titanium, or tantalum into a predetermined length and bending the cut metal. The blood vessel is sandwiched by the clip 1 and crushed by pliers to close the blood vessel.

FIG. 2 shows a staple 2 as a medical material A.
Is shown. The staple 2 has a function of suturing a living tissue cut during an operation. The staple 2 is configured by cutting stainless steel formed into a round or square linear shape into a predetermined length and bending it into a U-shape. The leg portion 2a of the staple 2 is made to face the living tissue to be sutured, and the living tissue is sutured by molding with a stapler.

An extremely thin DLC film having a thickness of about 1 μm is formed on the surface of the medical material A such as the clip 1 and the staple 2. The DLC film is formed by decomposing hydrocarbons in plasma to form a diamond-like carbon film on the surface of a metal material, and is formed with high adhesion over the entire surface of the medical material A. This DL
The C film is not a diamond crystal film but an amorphous film, that is, an amorphous film. Therefore, an extremely smooth film is formed on the surface of the medical material A. The DLC film is chemically stable and highly biocompatible. Further, since the DLC film is an amorphous film, it is unstable with respect to temperature, and at 400 ° C. or higher, granular crystals grow to lose the smoothness of the film. However, in the temperature range of a living body, crystal grains are not generated and stable smoothness can be maintained.

[0011]

As described above in detail, according to the biomedical implant material for medical use of the present invention, an amorphous material which is chemically stable and highly biocompatible with the surface of a metal material formed into a predetermined shape. Since the diamond-like carbon film of No. 1 is formed, it has a feature that even if it is buried in the living body, the metal material is not corroded or adversely affects the living body.

[Brief description of drawings]

FIG. 1 is a perspective view of a clip.

FIG. 2 is a perspective view of a staple.

[Explanation of symbols]

A is a medical material, 1 is a clip, 2 is a staple, 2a
Is the leg.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Matsumoto 743 Nakaakutsu, Takanezawa-machi, Shioya-gun, Tochigi Prefecture Matsutani Manufacturing Co., Ltd.

Claims (2)

[Claims] 1. A medical material which is embedded in a living body after completion of medical operation, characterized in that an amorphous diamond-like carbon film is formed on the surface of a metal material formed into a predetermined shape. Bioburden material for use. 2. The biomedical implantable material for medical use according to claim 1, wherein the medical implantable material for implantation in the living body is a clip for blocking a blood vessel or a staple for suturing a living tissue.