Trocar and trocar system
First Claim
Patent Images
1. A trocar system comprising:
- a trocar needle structured to pierce a body wall;
an outer tube including a distal end and a proximal end from which the trocar needle is insertable;
a dilator which is interposed between the outer tube and the trocar needle, after being inserted from the proximal end of the outer tube, and has a pierce hole expansion portion that dilates a small-diameter pierce hole made by the trocar needle;
a guide member which includes a cylindrical portion which is projected outward from a distal end portion of the dilator, after being inserted from a proximal end portion of the dilator, the guide member including a handle portion which projects from a proximal end of the dilator, with the guide member engaged with the dilator; and
an adjusting mechanism for changing an amount of projection of the cylindrical portion by relatively moving the guide member and the dilator according to an operation of the handle portion to change the amount of projection of the cylindrical portion in a state in which the guide member and the dilator are combined.
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Accused Products
Abstract
A trocar has a projection portion which is a part of a tube projecting from a distal end portion of an outer tube in the state in which the tube is inserted in the outer tube, an amount of projection of the projection portion from the distal end portion of the outer tube varying in accordance with relative movement of the tube and the outer tube.
70 Citations
27 Claims
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1. A trocar system comprising:
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a trocar needle structured to pierce a body wall; an outer tube including a distal end and a proximal end from which the trocar needle is insertable; a dilator which is interposed between the outer tube and the trocar needle, after being inserted from the proximal end of the outer tube, and has a pierce hole expansion portion that dilates a small-diameter pierce hole made by the trocar needle; a guide member which includes a cylindrical portion which is projected outward from a distal end portion of the dilator, after being inserted from a proximal end portion of the dilator, the guide member including a handle portion which projects from a proximal end of the dilator, with the guide member engaged with the dilator; and an adjusting mechanism for changing an amount of projection of the cylindrical portion by relatively moving the guide member and the dilator according to an operation of the handle portion to change the amount of projection of the cylindrical portion in a state in which the guide member and the dilator are combined. - View Dependent Claims (2, 3)
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4. A trocar system comprising:
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a needle structured to pierce and to be inserted into a body wall; an oscillation element which produces ultrasonic oscillation and is connected to the needle; a sheath including a proximal end from which the needle is insertable, and a distal end which has a first opening from which the needle is projectable; a trocar tube in which the sheath is insertable and which has a second opening at a distal end portion thereof, from which the distal end portion of the sheath is projectable, a length of the sheath projecting from the distal end portion of the trocar tube being greater than a thickness of the body wall; and an adjusting mechanism in which a length of the sheath projecting from the distal end portion of the trocar tube is changed by an operation of the proximal end of the sheath according to a condition of a pierced portion, and the sheath is fixable, with the length changed, wherein the sheath is projected from the proximal end of the trocar tube, while being engaged with the trocar tube. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A trocar comprising:
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a needle structured to pierce and to be inserted into a body wall; an oscillation element including a proximal end and a distal end to which the needle is connected, the oscillation element being configured to transmit ultrasonic oscillation to the needle; a holding member including a distal end and a proximal end fixed to the proximal end of the oscillation element to hold the oscillation element; a first tube including a handle portion, a distal end and a proximal end from which the needle is insertable, the first tube defining a position of part of the needle which is projected from the distal end of the first tube, proximal end of the first tube and the distal end of the holding member are engaged with each other, with the needle inserted from the distal end of the first tube; and a second tube including a proximal end from which the first tube is insertable, and from which the handle portion of the first tube projects, and a distal end from which the distal end of the first tube is projectable in accordance with the relative movement between the first tube and the second tube, which is carried out by an operation of the handle portion of the first tube after the first tube is inserted from the proximal end of the second tube.
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15. A trocar comprising:
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a needle structured to pierce and to be inserted into a body wall; an oscillation element to which the needle is connected, and which is configured to transmit ultrasonic oscillation to a distal end of the needle; a first tube including a handle portion, a distal end and a proximal end from which the needle is insertable, the first tube being fixable, with a distal end of the needle projecting from the distal end of the first tube; a second tube including a proximal end in which the first tube and the needle are insertable, and from which the handle portion of the first tube projects and a distal end from which the distal end of the first tube and the needle are projectable; a lock mechanism for fixing the first tube to the second tube in one of at least two positions, which is selected in accordance with the movement of the first tube relative to the second tube by an operation of the handle portion, the lock mechanism enabling adjusting an amount of projection of the distal end of the first tube from the distal end of the second tube by changing a position of the first tube with respect to the second tube to said selected one of said at least two positions. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification