Use of shape memory alloy for internally fixing light emitting d

Details Use of shape memory alloy for internally fixing light emitting d Use of shape memory alloy for internally fixing light emitting d

1996-12-04

2000-06-27

Nasser, Robert L.

Surgery

Instruments

Orthopedic instrumentation

606 2, 607 96, 128897, A61B 1700

Patent

active

060801603

ABSTRACT:
A method and apparatus for selectively engaging and disengaging an anchor to fix a medical device at a selected site within a patient's body. A shape memory alloy (SMA) such as Nitinol is used to fabricate one or more anchors for the medical device. The shape memory effect exhibited by the SMA is thermally activated. One embodiment of the anchor has a substantially circular shape when at its martensite temperature and reverts to an elliptical shape at its austenite temperature. Another embodiment is a substantially straight strip at its martensite temperature and has an end that curls to engage tissue when at its austenite temperature. Still another embodiment includes a pair of anchors that extend outwardly from each side of an elongate probe at their austenite temperature and retract inwardly against the sides of the probe at their martensite temperature. The change in the shape of the SMA elements tends to anchor the medical device or probe at the treatment site. To change the temperature of the SMA elements, an electrical current is selectively energized to provide heat, or thermal conduction between the SMA and a heat source or a heat sink is employed.

REFERENCES:
patent: 3789838 (1974-02-01), Fournier et al.
patent: 4427000 (1984-01-01), Ueda
patent: 4485816 (1984-12-01), Krumme
patent: 4665906 (1987-05-01), Jervis
patent: 4898156 (1990-02-01), Gatturna et al.
patent: 4935068 (1990-06-01), Duerig
patent: 5002563 (1991-03-01), Pyka et al.
patent: 5147370 (1992-09-01), McNamara et al.
patent: 5171252 (1992-12-01), Friedland
patent: 5197978 (1993-03-01), Hess
patent: 5219358 (1993-06-01), Bendel et al.
patent: 5267960 (1993-12-01), Hayman et al.
patent: 5290289 (1994-03-01), Sanders et al.
patent: 5509923 (1996-04-01), Middleman et al.
patent: 5514178 (1996-05-01), Torchio
patent: 5522845 (1996-06-01), Wenstrom, Jr.
patent: 5542434 (1996-08-01), Imran et al.
patent: 5571104 (1996-11-01), Li
patent: 5578074 (1996-11-01), Mirigian
S.M. Andrews et al., "Shape memory alloys in minimally invasive therapy," Minimally Invasive Therapy 1995: 4: 315-318; .COPYRGT.1995 Blackwell Science Ltd.
E. Cingolani et al., "The Two Way Shape Memory Effect In Cu-Zn-Al Single Crystals: Role of Disclocations and Stabilization," Acta metall. mater. vol. 43, No. 6, pp. 2451-2461, 1995; .COPYRGT. 1995 Elsevier Science Ltd., Printed in Great Britain.
Mitek Surgical Products, Inc. Brochure for Mitek GII Anchor.TM., .COPYRGT.1991 Mitek Surgical Products, Inc., 2 pages.
H. Oonishi et al., "Studies on the Development of a High-Frequency Induction Heating Apparatus to Heat a Shape Memory TiNi Alloy Implanted in a Living Body," Biomaterials and Biomechanics 1983, edited by P. Ducheyne et al., Elsevier Science Publishers B.V., Amsterdam, 1984, pp. 155-161.
L. McDonald Schetky, "Shape-Mrmory Alloys," Sci. Am., vol. 241 No. 5, Nov. 1979, pp. 74-83.

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