Basket-type grasping tool adapted for use in combination with an endoscope
First Claim
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1. A basket-type grasping tool adapted for use in combination with an endoscope, wherein:
- a basket section formed by at least three elastic wires bundled at both of front and rear ends thereof being extractable from and retractable into a tip end of a sheath so that said basket section is expanded into a basket-like shape by the elasticity of said basket section when said basket section is extracted from said tip end of said sheath, and contracted when said basket section is retracted into said tip end of said sheath, said tip end of said sheath having a center axis, and said basket section having a center axis which is an extension of said center axis of said tip end;
at least first axially corresponding portions of said elastic wires being bent about said center axis of said basket section in the same direction; and
guide paths through which said elastic wires respectively pass being formed on an inner face of a tip-end mouth of said sheath.
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Abstract
A basket-type grasping tool, adapted for use in combination with an endoscope, for capturing a foreign material or the like into a basket section. Axially corresponding portions of elastic wires are each twisted in the same direction about a center axis of a basket section. Guide paths, through which the elastic wires respectively pass, are formed on an inner face of a tip-end mouth of a sheath.
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Citations
15 Claims
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1. A basket-type grasping tool adapted for use in combination with an endoscope, wherein:
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a basket section formed by at least three elastic wires bundled at both of front and rear ends thereof being extractable from and retractable into a tip end of a sheath so that said basket section is expanded into a basket-like shape by the elasticity of said basket section when said basket section is extracted from said tip end of said sheath, and contracted when said basket section is retracted into said tip end of said sheath, said tip end of said sheath having a center axis, and said basket section having a center axis which is an extension of said center axis of said tip end; at least first axially corresponding portions of said elastic wires being bent about said center axis of said basket section in the same direction; and guide paths through which said elastic wires respectively pass being formed on an inner face of a tip-end mouth of said sheath. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A basket-type grasping tool adapted for use in combination with an endoscope, wherein:
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a basket section formed by at least three elastic wires bundled at both of front and rear ends thereof being extractable from and retractable into a tip end of a sheath so that said basket section is expanded into a basket-like shape by the elasticity of said basket section when said basket section is extracted from said tip end of said sheath, and contracted when said basket section is retracted into said tip end of said sheath, said tip end of said sheath having a center axis, and said basket section having a center axis which is an extension of said center axis of said tip end; each of said elastic wires having a largely expandable middle portion, a forward portion extending forwardly from said middle portion, and a rearward portion extending rearwardly of said middle portion; at least one of said forward and rearward portions of said each elastic wire not being bent about said center axis of said basket section; and the rest of said forward, middle and rearward portions of said each elastic wire being partially or entirely bent about said center axis of said basket section in the same direction. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification