Retrieval device made of precursor alloy cable
First Claim
1. A medical retrieval device for retrieving foreign objects from a patient'"'"'s body, comprising:
- a retrieval assembly including a cable preformed into a configuration adapted to capture and remove said foreign objects, wherein said cable includes a core wire made of a precursor alloy to a superelastic material and a plurality of wire strands surrounding the core wire.
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Accused Products
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.
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Citations
37 Claims
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1. A medical retrieval device for retrieving foreign objects from a patient'"'"'s body, comprising:
a retrieval assembly including a cable preformed into a configuration adapted to capture and remove said foreign objects, wherein said cable includes a core wire made of a precursor alloy to a superelastic material and a plurality of wire strands surrounding the core wire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30)
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15. A method of manufacturing a medical retrieval device for retrieving foreign objects from a patient'"'"'s body, comprising the steps of:
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constructing a cable including a core wire made of a precursor alloy to a superelastic material and a plurality of wire strands surrounding the core wire; and
forming a retrieval assembly by preforming said cable into a configuration adapted to capture and remove said foreign objects.
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28. A medical retrieval device for retrieving foreign objects from a patient'"'"'s body, comprising:
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a plurality of cables interconnected to form a retrieval basket, each of said plurality of cables including a core wire and a plurality of wire strands surrounding the core wire, wherein the core wire and the plurality of wire strands each consist of a precursor alloy to a superelastic material so that an elongation of the core wire corresponds with similar elongation of the plurality of wire strands.
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31. A medical retrieval device for retrieving foreign objects from a patient'"'"'s body, comprising:
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a plurality of cables interconnected to form a retrieval basket, each of said plurality of cables including a core wire and a plurality of wire strands surrounding said core wire;
wherein the core wire and the plurality of wire strands each consist of a precursor alloy to a superelastic material so that the basket is capable of withstanding a relatively large stress without permanently deforming the basket. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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Specification