JPS5946955A - Hard tissue replacing composite material having stress releasing function during living body motion - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite material for replacing hard tissues such as bones and teeth, which has a stress relieving function during biological movement.

Conventional graft materials for hard tissues such as artificial bones and artificial tooth roots use materials that only have strong strength or are stable in the biological environment, such as laminated lamic. However, it lacks biomechanical innovation such as elastic modulus, which is required for hard tissues.

Therefore, there is a noticeable defect in the shock absorbing effect during biological movements such as walking and chewing, and the user has to endure a strong sense of discomfort due to this defect, and at the same time, there is a great possibility that some kind of trouble may occur during use.

For example, when a ceramic artificial patella 2 is implanted in a long tube 1 as shown in Fig. 1, there is a large difference in the elastic modulus of ceramic and bone material as shown in Le 11 and Kerr strain curve in Fig. Sometimes the ceramic patella 2 cannot respond to the movement of the long tube 1, which causes a biomechanical failure, resulting in a strong sense of discomfort. It has its drawbacks.

The present invention can eliminate the above-mentioned defects (1) to provide a composite material for tissue replacement (4), and its characteristics (1) are that the hard tissue of each part is X-ray inspection after implantation of an implant molded from the composite material of the present invention by adding various necessary mechanical properties to a polymer resin compound with mechanical properties similar to those of The reason lies in the fact that we have made it possible.

Next, an embodiment based on the above features will be described with reference to the accompanying drawings.

Polymer Composite 44R+ is a polymer composite used to replace hard tissues such as bones and teeth, and is a polymer resin compound with mechanical properties similar to those of the hard tissues of each part, with various additives added to harmonize with the hard tissues. It has the required biomechanical properties and also has X-ray radiopacity.

For example, the elastic modulus of compact bone tissue is 50.0 in long bones (femur, tibia, ulna, etc.) at the age of 70 to 70.
00～/gθ00θKg/crl, teeth are Otsu 0,
00θ-200,000Kp/C1d, also lit
The elastic modulus of f, t (I m is 2 shio θ ~ shio 00 Ky /
cyrl, and its stress-strain curve is as shown in FIG. Moreover, the elastic modulus differs depending on each part or age within the above range.

Therefore, the biocompatible '11. Excellent 1°1. '1-molecule compounds such as polyalpone resin, polyether sulfone resin, polycarbonate resin, polyarylate resin, polyacetal resin, etc. are used as a 1-co composition, and various additives such as potassium titanates and their similar series, glasses, and Biomechanical physical properties such as elastic modulus are achieved by compounding the same series, ceramics and the same series, fluorine and the same series, etc. in the form of fibers, bricks, powders, or liquids at the required addition rate. harmonizes with hard tissue. In that case resin,
Required physical properties can be obtained by various combinations of additive types 1, additive states, proportions, etc.

In this way, biomechanical properties such as elastic modulus, abrasion resistance, viscoelastic modulus, shear force, and bending moment are matched to each hard tissue.

FIG. 3 shows a state in which an artificial patella 12 formed from the composite material 11 configured as described above is embedded in a long tube 13.

Further, FIG. 7 shows an artificial long tube 15 formed by injecting a metal material 14 as a reinforcing body into the composite material 11, and FIG. 5 shows an artificial scapula 16 formed.

Roo, what about metal eyebrows 14? 4-shaped, plate-shaped, etc., with a plurality of J blade holes 14a scattered therethrough, and this convex shape 14a filled with 4.
``Nio-agikai-i: You can strengthen the bond with ``1.''

In order to have a Y-phase identification affinity, i, which is a -1mi component,
H', i min-f- Calcium titanate or Cal 7l/j\ may be added to the compound.

-・To give an example, one series of polysarpone resin 1/1
．． Rate 1; 12 g Ooo ~, 23.000 Ky
/cnj, which does not reach the elastic modulus of the hard tissue described in 1, but if potassium titanate and glass are added in the form of fine fibers at 1", the elastic modulus of /10,000 + modulus/d is within the range described. A high elastic modulus is obtained.

In this way, mechanical properties that are compatible with the different biomechanical properties of bones, teeth, or age can be obtained by combining various types and combinations of resins and additives. In addition, it is made opaque to enable X-ray examination.

The present invention is in the field of hard tissue implants such as bones and teeth.
simply meet the basic conditions of being stable in the biological environment, and
We go beyond the scope of conventional simple repair, which only requires a certain level of strength, to focus on biomechanical physical properties and develop the necessary biomechanics of a replacement for each hard tissue that harmonizes with that hard tissue. Since we provide a composite material for hard tissue replacement that has physical properties and a stress-relieving function during living body movements, implants molded with such materials can provide a natural sense of harmony during movement, and can last for a long time. The medical effects of using a dirty transplant without any risk of injury over a period of time are enormous.

[Brief explanation of the drawing]

The drawings show an actual 111h example of the present invention; FIG.
FIG. 1 is a cross-sectional view of the present invention. 11. Composite A'A interest rate 14. Monthly metal interest rate 12.15.
16...Artificial bone! 1. 17'1 Applicant
Kogure Yamato”l

Claims (1)

[Scope of Claims] / There is a polymer/composite phase for heat treatment on the 1st and 4th sides of the bone, and a layer of material that harmonizes with the hard tissue as a substitute for each hard tissue part. I+i during biological interlocking, which is characterized by having the necessary biomechanical substances 11; 4- (Composite material for hard tissue replacement having stress relieving function during body movement) according to item 1.