Title:
BONE JOINT SCREW
Document Type and Number:
Japanese Patent JP3958448
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a bone joint screw which can be decomposed and absorbed in-vivo, which has a large area effective for transmission of torque of a screwdriver, which can efficiently and uniformly transmits torque without concentration of the torque, and which can firmly be screwed in vivo without damaging cross grooves and a head thereof.
SOLUTION: A bone joint screw 1 is made of a polymer which can be decomposed and absorbed in vivo. Cross grooves 5 are formed in the top surface of a screw head 2, and the center parts of the cross grooves 5 are formed in a deep groove parts 6 having deeper bottoms, except the four ends thereof. Due to the provision of the deep groove parts 6, the area effective for transmission of torque of a screwdriver can be increased so that the torque can be efficiently and uniformly transmitted without concentration of the torque, thereby it is possible to screw the bone joint screw into a biological bone without damaging the cross grooves and the screw head 2.
Inventors:
Hidekazu Botani
Sasaki Mitsugu
Sasaki Mitsugu
Application Number:
JP28888298A
Publication Date:
August 15, 2007
Filing Date:
September 24, 1998
Export Citation:
Assignee:
Takiron Co., Ltd.
International Classes:
A61B17/58; F16B35/00; A61B17/88; F16B23/00; A61B17/86; (IPC1-7): F16B35/00; A61B17/58; F16B23/00
Domestic Patent References:
| JP9253089A | ||||
| JP4958955U | ||||
| JP715271U | ||||
| JP4132213U | ||||
| JP5614614A | ||||
| JP4981750A | ||||
| JP528913Y1 | ||||
| JP6430912A | ||||
| JP5662412U |
Attorney, Agent or Firm:
河▲崎▼ 眞樹