Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-10-06
1997-09-23
McDermott, Corrine M.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 35, 604 22, 606171, 128898, A61M 3100
Patent
active
056698763
ABSTRACT:
A method and apparatus minimally invasive tissue removal contemplates a system including a tissue cutting tool having a motor driven cutting blade reciprocating within a percutaneously introducable cannula. In accordance with one method of the invention, the frequency of reciprocation of the cutting blade is tuned to a characteristic frequency of the target tissue to be excised, which frequency is a function of certain properties of the target tissue and the surrounding tissue. Cutting at the characteristic frequency of the target tissue not only enhances the speed and efficiency of the tissue excision, but also minimizes the risk of cutting surrounding tissue. Another aspect of the system includes feedback control of both aspiration and irrigation circuits of the system. With the feedback control, coupled with user settable inputs, the surgeon can control the system to "tease" tissue into the cutting opening to provide more manageable bite sizes of the excised tissue. Controllable valves and pressure transducers allow the operator to set and maintain the aspiration vacuum and irrigation pressure at optimum levels. In other aspects of the invention, other cutting heads, such as a rasp and a tissue morcelator, are disclosed which take advantage of the integrated feedback control system of the invention.
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Publication: Automated Percutaneous Lumbar Diskectomy, by Gary Onik and Clyde A. Helms; Commentary by H.M. Herkowitz, M.D.; published 1991.
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Brochure; Amset PLD Percutaneous Lumbar Disectomy, by AMC; published 1992 Official Gazette: Pressure Infusion Device; U.S. Patent No. 4,735,613 to Bellin et al.; filed Oct. 23, 2986, Serial. No. 922,173; Issued Apr. 5, 1988.
Mark Joseph L.
Schechter Alan M.
Danek Medical Inc.
Gring N. Kent
McDermott Corrine M.
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