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US 10,111,767 B2Granted
Sheaths used in polymer scaffold delivery systems
AssigneeAbbott Cardiovascular Systems Inc.
InventorJohn E. Papp
Life of this patent
Estimating the term…
Abstract
A medical device includes a polymer scaffold crimped to a catheter having an expansion balloon. A sheath is placed over the crimped scaffold after crimping to reduce recoil of the crimped polymer scaffold. The sheath is removed before the medical device is implanted within the body.
Claims11
A method for crimping, comprising:
- using a scaffold having a scaffold diameter, the scaffold being made from a polymer tube and having a plurality of rings interconnected by links;
- using a balloon catheter;
- using a sheath having a sheath diameter, the sheath being configurable between an un-deformed state and a deformed state by radially stretching the sheath along its entire circumference, wherein the sheath is a tube having an undeformed diameter (d0) and when radially stretched the sheath has a deformed diameter (d3) at both ends thereof, and d3>d0;
- crimping the scaffold to the balloon catheter including reducing the scaffold diameter from a first diameter (d1) to a second diameter (d2) by plastic deformation of the scaffold, wherein a ratio d1/d2 is at least 2.5;
- and
- reducing recoil effects in the crimped scaffold, comprising steps of
- deforming the sheath, including
- configuring the sheath into its deformed state to enable the sheath to receive the crimped scaffold, wherein d3>d2,
- receiving the crimped scaffold within the sheath configured in the deformed state, and
- after the crimped scaffold is received within the sheath configured in the deformed state, allowing the sheath to return to substantially the un-deformed state and attach to a surface of the scaffold rings;
- wherein the sheath is configured for being manually removed from the scaffold before the scaffold is placed within a body.
8 more elements
A method for crimping, comprising:
- using a scaffold having a scaffold diameter, the scaffold being made from a polymer tube and having a plurality of rings formed by struts connected at crowns;
- using a balloon catheter;
- using a tubular sheath having ends, a sheath diameter and a v-shaped cut is present at one or both of the ends;
- crimping the scaffold to the balloon catheter including reducing the scaffold diameter from a first diameter (d1) to a second diameter (d2) by plastic deformation of the scaffold, wherein a ratio d1/d2 is at least 2.5;
- and
- reducing recoil effects in the crimped scaffold, comprising steps of
- radially stretching the sheath along its entire circumference to increase the sheath diameter from an undeformed diameter (d0) to a deformed diameter (d3) at both of its ends, wherein d0 is less than d2 and d3 is greater than d2,
- receiving the crimped scaffold within the radially stretched sheath, and
- after the crimped scaffold is received within the radially stretched sheath, allowing the radially stretched sheath to return to a substantially un-deformed state, thereby attaching to surfaces of the scaffold struts;
- wherein the sheath is configured for being manually removed from the scaffold before the scaffold is placed within a body.
7 more elements
Dependencies are inferred from the claim text.