Delivery system with variable delivery rate for deploying a medical device
First Claim
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1. A system for delivering a medical device within vasculature, comprising:
- a retractable sheath;
a medical device retained by the retractable sheath; and
a handle assembly including an actuating mechanism coupled to the sheath, the actuating mechanism including a flexible elongate member having one end coupled to the retractable sheath and another end coupled to a wind-up member, the wind-up member being rotatable to allow a portion of the flexible elongate member to wind thereon to effect longitudinal movement of the sheath, and a speed-increasing member associated with the actuating mechanism which increases the speed by which the sheath moves longitudinally as the flexible elongate member is wound about the wind-up member, wherein the wind-up member is a drum and the speed-increasing member is a first cam directly and pivotally connected to the drum and a second cam directly linked to the first cam.
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Abstract
A delivery system utilizes a handle assembly including an actuating mechanism capable of initially providing sufficient mechanical advantage to overcome static friction when initiating deployment of the medical device. The actuating mechanism includes components which help to increase the speed of deployment as the physician continues to manipulate the actuating mechanism.
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Citations
24 Claims
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1. A system for delivering a medical device within vasculature, comprising:
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a retractable sheath; a medical device retained by the retractable sheath; and a handle assembly including an actuating mechanism coupled to the sheath, the actuating mechanism including a flexible elongate member having one end coupled to the retractable sheath and another end coupled to a wind-up member, the wind-up member being rotatable to allow a portion of the flexible elongate member to wind thereon to effect longitudinal movement of the sheath, and a speed-increasing member associated with the actuating mechanism which increases the speed by which the sheath moves longitudinally as the flexible elongate member is wound about the wind-up member, wherein the wind-up member is a drum and the speed-increasing member is a first cam directly and pivotally connected to the drum and a second cam directly linked to the first cam. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A handle for delivering a medical device within vasculature, comprising:
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a body; and an actuating mechanism located in the body, the actuating mechanism including a belt having a first end and a second end, the second end of the belt being coupled to a rotatable, wind-up member upon which at least a portion of the belt is wound to cause the first end of the belt to effect longitudinal movement, the wind-up member being rotated via an actuating motion to cause the belt to wind therearound, and a speed-increasing member to increase the longitudinal speed of the first end of the belt as the belt winds around the wind-up member when a particular input speed is applied by the user to the actuating mechanism, wherein the wind-up member is a drum and the speed-increasing member is a first cam directly and pivotally connected to the drum and a second cam directly linked to the first cam. - View Dependent Claims (9, 10, 11, 12)
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13. A system for delivering a medical device within vasculature, comprising:
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a retractable sheath; a medical device retained by the retractable sheath; and a handle assembly including an actuating mechanism coupled to the sheath, the actuating mechanism including a flexible elongate member having one end coupled to the retractable sheath and another end coupled to a wind-up member, the wind-up member being rotatable and having a outer edge upon which a portion of the flexible elongate member winds thereon to effect longitudinal movement of the sheath, the outer edge of the wind-up member having varying radiuses to increase the speed by which the retractable sheath moves longitudinally as the flexible elongate member is being wound about the wind-up member, and a speed-increasing member directly attached to the wind-up member, the speed-increasing member having an outer edge upon which a portion of the elongate member winds about as the wind-up member rotates, the speed-increasing member further increasing the speed by which the sheath moves longitudinally as the flexible elongate member is being wound about the wind-up member and the speed-increasing member. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification