A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
128/113
A61B 17/22 (2006.01)
Patent
CA 1320889
WM7 ABSTRACT CLINICALLY PRACTICAL ROTATIONAL ANGIOPLASTY SYSTEM The present invention is a clinically practical, rotational angioplasty system which employs a unique rotary ablative device for mechanically abrading, and thereby removing, lesions from within a patient's vessels. The device, called a "Rotablator" by its inventors, has a gas driven prime mover with an integrated water pump and fiberoptic tachometer. The prime mover is connected, via a hollow helical drive assembly, to an ellipsoidal, rotating, ablative burr which is used for the actual recannilization of the patient's vessel. The burr is provided with a central opening therethrough, which, together with the hollow drive assembly, permits the burr and drive assembly to be threaded over a guide wire similar to the type conventionally used in a catheterization procedure. The drive assembly is located within a hollow sheath which prevents the rotating drive assembly from contacting the inner walls of a patient's vessel. The lumen which is created between the drive assembly and the sheath is connected to a water pump within the Rotablator, and, in use, saline pumped through this lumen serves to lubricate and cool the rotating drive assembly. The fiberoptic tachometer uses a fiber optic cable assembly for determining the rotational speed of the air driven turbine. Accordingly, there is no direct electrical connection between the Rotablator drive unit and any electrical power supply, whereby assuring complete patient isolation from electrical power supplies. A control box is used to control the rotational speed of the angioplasty burr, with feedback provided to the electronics by means of the fiber optic tachometer. WM7 A foot control may be used by the physician conducting the angioplasty, to turn on the prime mover.
551950
Auth David Christopher
Clement Thomas J.
Hinchcliffe John S.
Intlekofer Michael J.
Slota Michael W.
Heart Technology Inc.
Osler Hoskin & Harcourt Llp
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