Retrieval device made of precursor alloy cable
First Claim
1. A medical device for retrieving foreign objects from a patient'"'"'s body, the device comprising:
- a retrieval device configured to be inserted into a patient'"'"'s body to a site of a foreign object, the retrieval device including a cable formed from a core wire made of a precursor alloy to a superelastic material and a plurality of wire strands surrounding the core wire, wherein the retrieval device is configured to be inserted into the patient'"'"'s body in a collapsed configuration and expand to an expanded configuration within the patient'"'"'s body, and wherein the retrieval device is configured to capture, crush, and remove a foreign object from the patient'"'"'s body.
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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.
184 Citations
37 Claims
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1. A medical device for retrieving foreign objects from a patient'"'"'s body, the device comprising:
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a retrieval device configured to be inserted into a patient'"'"'s body to a site of a foreign object, the retrieval device including a cable formed from a core wire made of a precursor alloy to a superelastic material and a plurality of wire strands surrounding the core wire, wherein the retrieval device is configured to be inserted into the patient'"'"'s body in a collapsed configuration and expand to an expanded configuration within the patient'"'"'s body, and wherein the retrieval device is configured to capture, crush, and remove a foreign object from the patient'"'"'s body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A medical device for retrieving foreign objects from a patient'"'"'s body, the device comprising:
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a retrieval assembly including a cable preformed into a basket-like configuration, the cable including a core wire made of a material that exhibits a linear stress-strain curve extending to a yield point, and a plurality of wire strands surrounding the core wire, wherein the retrieval assembly is configured to repeatedly capture and crush the foreign objects for removal from the patient'"'"'s body without substantial permanent deformation. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A medical device for retrieving foreign objects from a patient'"'"'s body, the device comprising:
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a retrieval assembly including at least a portion having a basket-like configuration, the portion being formed of at least one wire made of a precursor alloy to a superelastic material, wherein the portion of the retrieval assembly is configured to capture, crush, and remove at least one foreign object from the patient'"'"'s body. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification