A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
128/113
A61B 17/32 (2006.01) A61B 18/00 (2006.01) A61M 1/00 (2006.01)
Patent
CA 1264634
ABSTRACT OF THE DISCLOSURE A surgical instrument for cutting and separating biological tissue by employing ultrasonic vibration, particularly for cutting bones, separating the periosteum, and removing a coherent mass such as a calcium mass. The instrument includes an ultrasonic vibration-transmitting tool which is connected to an ultrasonic vibration source and which performs mechanical vibration at the frequency of the ultrasonic waves. The tool has a spoon-shaped working portion which is provided with at least one of a first blade-shaped portion and a second blade-shaped portion, the first portion including a blade-shaped part forming a predetermined angle with respect to the direction of the mechanical vibration at the frequency of the ultrasonic waves, the second portion including at least one blade-shaped part substantially parallel with the direction of the mechanical vibration at the frequency of the ultrasonic waves, the spoon-shaped working portion being brought into contact with the biological tissue. The tool further has a liquid passage passing through its interior, the liquid passage having an opening which opens into the working portion. Further, since the whole part or the surface portion of the spoon-shaped working portion which is provided with a blade-shaped portion to be brought into contact with the biological tissue is made of a ceramic material, it is possible to prevent wear deformation of the blade-shaped portion, and also to prevent transmission of electrical shocks to the nervous tissue in the event of a simple electrical fault occurring in the instrument.
518622
Idemoto Morito
Noguchi Yasuo
Fetherstonhaugh & Co.
Sumitomo Bakelite Company Limited
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