Retrieval device made of precursor alloy cable

Details Retrieval device made of precursor alloy cable Retrieval device made of precursor alloy cable

2011-07-05

2011-07-05

Robert, Eduardo C (Department: 3733)

Surgery

Instruments

Means for concretion removal

Reexamination Certificate

active

07972343

ABSTRACT:
A medical retrieval device for retrieving foreign objects from a patient and the method of constructing the device are disclosed. The device incorporates a wire cable composed of a precursor alloy to a superelastic material to improve durability of the device. Because precursor alloys exhibit a linear stress-strain relationship and a yield point associated with a relatively high stress level, the device transfers greater stresses before experiencing deformation. Thus, greater crushing forces can be achieved using a device of this type. These crushing forces may be needed when the foreign object is too large to remove intact. This property also facilitates the device in dilating ducts to retrieve foreign objects. Using the precursor alloy additionally eliminates the need for heat treatment of the cables used in constructing the device. A retrieval device made of precursor alloy cable also is less susceptible to permanent deformation and unwinding during use.

REFERENCES:
patent: 5057114 (1991-10-01), Wittich et al.
patent: 5238004 (1993-08-01), Sahatjian et al.
patent: 5330482 (1994-07-01), Gibbs et al.
patent: 5-508559 (1993-12-01), None
patent: 6-508284 (1994-09-01), None
patent: WO 91/15152 (1991-10-01), None
patent: WO 92/22254 (1992-12-01), None
An English language version of a communication from the Japanese Patent Office citing the above Japanese Patents in Patent Application No. 2001-53602, mailed Sep. 16, 2008.

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