Surgery – Instruments – Orthopedic instrumentation
Patent
1992-02-28
1997-05-27
Hilten, John S.
Surgery
Instruments
Orthopedic instrumentation
606170, 606174, A61B 1756
Patent
active
056327463
ABSTRACT:
The present invention provides a device or apparatus for manipulating matter in a confined or inaccessible space, comprising manipulator means at least partly constructed of one or more bent or twisted elongate shape memory alloy members having pseudoelasticity at the intended manipulation temperature, and a hollow housing (preferably of elongate tubular form) or cannula capable of holding at least the shape memory alloy member(s) in a relatively straightened state, and actuating means for extending the shape memory alloy member(s) from the housing to manipulate matter within the said space and for withdrawing the shape memory alloy member(s) into the housing, the arrangement being such that the shape-memory alloy member(s) bend(s) or twist(s) pseudoelastically in a lateral or helical sense to manipulate the matter on extending from the housing at the said manipulation temperature, and become(s) relatively straightened on withdrawal into the housing at the said temperature.
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"An Engineer's Perspective of Pseudoelasticity", by T.W. Duerig and R. Zadno, Engineering Aspects of Shape Memory Alloys, pp. 369-393.
Buhler Michael
Dyk Karl Van
Jervis James E.
Middleman Lee M.
Poncet Philippe
Hilten John S.
Medtronic Inc.
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