Kobe University

Takiron Co., Ltd.

Teijin Medical Technologies Co., Ltd.

Masaki Okuno

Hiroshi Morii

Yasuo Shikinami

Katsuya Nada

Ryosuke Kuroda

Ryo Kashiwadani

A guide pin piercing jig includes a curved frame, a front cylinder unit provided at a front end of the frame, and a rear cylinder unit provided at a rear end of the frame, in which the front cylinder unit has a positioning projection and a boring aiming portion at a tip thereof, the rear cylinder unit has a plurality of parallel guide pin insertion cylinders into which to insert the guide pins and a tentative fixing unit provided at a tip of the rear cylinder unit, and the rear cylinder unit is provided at a rear end of the frame slidably so as be directed to a tip of the front cylinder unit. It becomes possible to aim at a proper portion of a living body bone through which to bore a bone tunnel and to pierce the living body bone with guide pins for hollow drills from behind the living body bone to the proper aiming portion in a proper direction.

Jig for guide pin piercing

A guide pin piercing jig includes a cylinder unit and a frame having a positioning projection at a tip thereof, in which the cylinder unit has plural parallel guide pin insertion cylinders and tentative fixing unit and is attached to the frame slidably so as to be directed to the tip of the frame. It becomes possible to pierce living body bone with plural guide pins for hollow drills to a proper portion of a living body bone in a proper direction with parallel arrangement to form a bone tunnel that has a rectangular or elliptical opening and is suitable for tendon transplantation.

A drill guide has a main body in which a drill insertion hole is formed and plural projection portions to be inserted into plural bone tunnels. The plural projection portions project forward from the main body parallel with the center line of the drill insertion hole, a virtual drill insertion hole which extends from the drill insertion hole of the main body is formed between the plural projection portions parallel with their center lines by cutting out confronting portions of the plural projection portions, and the length of at least one of the drill insertion hole and the virtual drill insertion hole is 5 mm or more. The drill guide can guide a drill so as to be correctly between plural bone tunnels bored through a living body bone without causing axis deviation so that a link bone tunnel for connecting the plural bone tunnels can be formed between them in the same direction as their direction.

Drill guide

A process for producing a biodegradable and bioabsorbable implant material, which comprises forging a billet comprising and biodegradable and bioabsorbable crystalline polymer at a low temperature and then forging the same once more or in a plurality of times at a low temperature by changing its press-forcing direction.

Method for adjusting the shape of a biodegradable and bioabsorbable implant material

This invention provides a biodegradable and bioabsorbable implant material having a high mechanical strength wherein its shape after deformation within ordinary temperature range can be fixed and maintained so that its shape can be easily adjusted at the site of operation, and it has substantially no anisotropy in view of strength so that it does not cause whitening, breakage and sharp decrease in strength when its bending deformation is repeated in any direction and it has toughness. Particularly, it provides an implant material which comprises a biodegradable and bioabsorbable crystalline polymer that has a crystallinity of 5% or more, can effect deformation such as bending or twisting within ordinary temperature range and has a shape-keeping ability to fix and maintain the shape after deformation as such, wherein molecular chains, domains of molecular chain assembly or crystals of the polymer are oriented along a large number of reference axes having different axial directions, or clusters having these reference axes having different orientation are assembled in a large number.

Growing community of inventors

Osaka, Japan

Masaki Okuno