Diathermic snare, medical instrument system using the snare, and method of assembling the medical instrument system
First Claim
1. A diathermic snare used in combination with an endoscope, the endoscope including an inserting section which is inserted into a body cavity and which has a distal end and a proximal end, and a cylindrical cap section mounted on the distal end of the inserting section, the cap section having a distal end, a proximal end and an engagement projection having a bending portion that bends inward at the distal end of the cap section, wherein the diathermic snare comprises:
- an elongated flexible sheath having a distal end and a proximal end;
an operating wire inserted into the sheath so as to move forward and backward and having a distal end and a proximal end;
a snare wire coupled to the distal end of the operating wire and having a loop section which expands like a loop;
an operating section coupled to the proximal end of the sheath and including a guide member extending in an axial direction of the sheath and a slider which moves forward and backward in the axial direction of the sheath along the guide member and which is coupled to the proximal end of the operating wire;
the loop section of the snare wire projecting from the distal end of the sheath, the snare wire expanding like a loop, and the loop section expanding along an inner circumference of the engagement projection when the slider moves toward along the guide member; and
the loop section being stored in the sheath when the slider moves backward along the guide member; and
a bending portion provided at the distal end of the loop section, the bending portion ending in a direction that intersects a plane formed by the loop section and conforming to a corner of the bending portion of the engagement projection when the loop section expands along the inner circumference of the projection.
2 Assignments
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Accused Products
Abstract
A loop section has a bending portion at the distal end. The bending portion bends in a direction that intersects the plane formed by the loop section. A diathermic snare is used in combination with an endoscope. When the loop section expands along the inner circumference of an engagement projection of a cap section, the bending portion of the loop section conforms to the corner of the bending portion of the projection.
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Citations
13 Claims
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1. A diathermic snare used in combination with an endoscope, the endoscope including an inserting section which is inserted into a body cavity and which has a distal end and a proximal end, and a cylindrical cap section mounted on the distal end of the inserting section, the cap section having a distal end, a proximal end and an engagement projection having a bending portion that bends inward at the distal end of the cap section,
wherein the diathermic snare comprises: -
an elongated flexible sheath having a distal end and a proximal end;
an operating wire inserted into the sheath so as to move forward and backward and having a distal end and a proximal end;
a snare wire coupled to the distal end of the operating wire and having a loop section which expands like a loop;
an operating section coupled to the proximal end of the sheath and including a guide member extending in an axial direction of the sheath and a slider which moves forward and backward in the axial direction of the sheath along the guide member and which is coupled to the proximal end of the operating wire;
the loop section of the snare wire projecting from the distal end of the sheath, the snare wire expanding like a loop, and the loop section expanding along an inner circumference of the engagement projection when the slider moves toward along the guide member; and
the loop section being stored in the sheath when the slider moves backward along the guide member; and
a bending portion provided at the distal end of the loop section, the bending portion ending in a direction that intersects a plane formed by the loop section and conforming to a corner of the bending portion of the engagement projection when the loop section expands along the inner circumference of the projection.
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2. A medical instrument system using a diathermic snare and an endoscope in combination with each other, the endoscope including an inserting section which is inserted into a body cavity and which has a distal end and a proximal end, and a cylindrical cap section mounted on the distal end of the inserting section, the cap section having a distal end, a proximal end and an engagement projection having a bending portion that bends inward at the distal end of the cap section,
wherein the medical instrument system comprises: -
an elongated flexible sheath having a distal end and a proximal end;
an operating wire inserted into the sheath so as to move forward and backward and having a distal end and a proximal end;
a snare wire coupled to the distal end of the operating wire and having a loop section which expands like a loop;
an operating section coupled to the proximal end of the sheath and including a guide member extending in an axial direction of the sheath and a slider which moves forward and backward in the axial direction of the sheath along the guide member and which is coupled to the proximal end of the operating wire;
the loop section of the snare wire projecting from the distal end of the sheath, the snare wire expanding like a loop, and the loop section expanding along an inner circumference of the engagement projection when the slider moves toward along the guide member; and
the loop section being stored in the sheath when the slider moves backward along the guide member; and
a bending portion provided at the distal end of the loop section, the bending portion bending in a direction that intersects a plane formed by the loop section and conforming to a corner of the bending portion of the engagement projection when the loop section expands along the inner circumference of the projection. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of assembling a medical instrument system using a diathermic snare and an endoscope in combination with each other,
the endoscope including an elongated inserting section which is inserted into a body cavity and which has a distal end and a proximal end, and a cylindrical cap section mounted on the distal end of the inserting section, the cap section having a distal end, a proximal end, an engagement projection having a bending portion that bends inward at the distal end of the cap section, a fixing section provided at the proximal end of the cap section and fixed to a distal end of the endoscope, and a soft tube having an open distal end and an open proximal end, the soft tube being arranged alongside the inserting section of the endoscope when the fixing section is fixed to the distal end of the endoscope, and the open distal end communicating with an inside of the cap section, the diathermic snare including an elongated flexible sheath having a distal end and a proximal end, an operating wire inserted into the sheath so as to move forward and backward and having a distal end and a proximal end, a snare wire coupled to the distal end of the operating wire and having a loop section which expands like a loop, an operating section coupled to the proximal end of the sheath and including a guide member extending in an axial direction of the sheath and a slider which moves forward and backward in the axial direction of the sheath along the guide member and which is coupled to the proximal end of the operating wire, the loop section of the snare wire projecting from the distal end of the sheath, the snare wire expanding like a loop, and the loop section expanding along an inner circumference of the engagement projection when the slider moves toward along the guide member, and the loop section being stored in the sheath when the slider moves backward along the guide member, and a bending portion provided at the distal end of the loop section, the bending portion bending in a direction that intersects a plane formed by the loop section and conforming to a corner of the bending portion of the engagement projection when the loop section expands along the inner circumference of the projection, and the plane formed by the loop section inclining in the axial direction of the sheath and the loop section rotating around an axis of the sheath, comprising: -
a diathermic snare inserting step of mounting the cap section on the endoscope, then inserting the diathermic snare into the tube, and projecting the distal end of the sheath forward from the cap section;
a loop section projecting step of projecting the loop section from the sheath while the distal end of the sheath is projected from the cap section;
a loop section direction adjusting step of rotating the loop section around an axis of the sheath when necessary and adjusting a direction of the loop section;
a retracting step of retracting the loop section into the cap section;
a cap section pressing step of pressing a leading edge of the cap section against an object; and
a loop section setting step of pushing the sheath to bring the loop section into intimate contact with the engagement projection and expanding the loop section circularly along the engagement projection.
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Specification