Delivery and detachment mechanisms for vascular implants
First Claim
Patent Images
1. A vascular delivery system, comprising:
- an implant having, at a proximal region, a hub defining a port having an inner cross-sectional dimension;
a shaft having (i) a tube and (ii) a collet having a plurality of extension members attached to a distal end of the tube, the collet being distal to the port, the collet having a flared state with a flared cross-sectional dimension and a relaxed state with a relaxed cross-sectional dimension, less than the flared cross-sectional dimension;
a control wire extending through a lumen of the shaft and having an engagement portion, distal to at least a portion of the collet, with an engagement cross-sectional dimension, greater than the relaxed cross-sectional dimension, and being retractable relative to the collet, wherein proximal retraction of the engagement portion against the collet causes the collet to transition from the relaxed state to the flared state, wherein the control wire is biased to move proximally while the engagement portion is positioned against the extension members;
wherein the collet is configured to remain distal to the port while in the flared state.
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Abstract
Vascular delivery systems configured to deliver an implant to a location within a vasculature can include one or more control wires controllable by a user to detach the implant from the delivery system. Control wires can cause a feature of the delivery system to mechanically engage a hub at a proximal end of an implant. Proximal or distal movement of the control wire can allow the feature to disengage from the hub, thereby allowing release of the implant.
196 Citations
17 Claims
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1. A vascular delivery system, comprising:
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an implant having, at a proximal region, a hub defining a port having an inner cross-sectional dimension; a shaft having (i) a tube and (ii) a collet having a plurality of extension members attached to a distal end of the tube, the collet being distal to the port, the collet having a flared state with a flared cross-sectional dimension and a relaxed state with a relaxed cross-sectional dimension, less than the flared cross-sectional dimension; a control wire extending through a lumen of the shaft and having an engagement portion, distal to at least a portion of the collet, with an engagement cross-sectional dimension, greater than the relaxed cross-sectional dimension, and being retractable relative to the collet, wherein proximal retraction of the engagement portion against the collet causes the collet to transition from the relaxed state to the flared state, wherein the control wire is biased to move proximally while the engagement portion is positioned against the extension members; wherein the collet is configured to remain distal to the port while in the flared state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of delivering a vascular implant, comprising:
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delivering, to a target location, an implant having a hub at a proximal end of the implant, while (i) a shaft extends through a port of the hub, the shaft having a tube, (ii) a collet of the shaft, in a flared state with a flared cross-sectional dimension greater than an inner cross-sectional dimension of the port, is distal to the port, the collet having a plurality of extension members attached to a distal end of the tube, (iii) a control wire extends through a lumen of the shaft, and (iv) an engagement portion of the control wire abuts the collet to hold the collet in the flared state, wherein the control wire is biased to move proximaaly while the engagement portion abuts the collet; advancing the control wire distally until the collet transitions to a relaxed state with a relaxed cross-sectional dimension, less than the flared cross-sectional dimension; retracting the shaft proximally past the port; and retracting the control wire proximally past the port. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification