Patent ID: 9155552
Filing Date: 2015-10-13
Classification: A61B,A61M

Abstract:
1. A system for removing objects within an interior lumen of an animal, the system comprising: a pull wire having a proximal end, a distal end and a pull wire longitudinal axis extending from the proximal end to the distal end; a coaxial sheath having a hollow interior, an open proximal end leading to the interior, and an open distal end leading to the interior, the coaxial sheath enveloping the pull wire, the coaxial sheath slideable along at least a segment of the pull wire; a distal basket comprising an interior, a proximal end, a distal end, a distal basket length extending from the distal basket proximal end to the distal basket distal end, a distal basket height perpendicular to the distal basket length, a plurality of proximal cells defined by a plurality of proximal cell memory metal strips, each proximal cell comprising a proximal crown located at a proximal end of the proximal cell and pointing generally in the proximal direction and a distal crown located at a distal end of the proximal cell and pointing generally in the distal direction, and a plurality of distal cells distal to the proximal cells; a plurality of proximal strips, each proximal strip having a proximal end extending from the coaxial sheath, a distal end attached to a proximal crown of a proximal cell and a length extending from the proximal end to the distal end; and a catheter having a hollow interior, a proximal end leading to the interior and a distal end leading to the interior, the catheter comprised of a biocompatible material, the distal basket comprised of a memory metal and having: a relaxed state in which the open distal end of the coaxial sheath is located at a first position along the pull wire, the first position located a first distance proximal to the proximal crowns, and in which the distal basket, as measured at the proximal end of the distal basket, has a first height, a proximal collapsed state in which the open distal end of the coaxial sheath is located at a second position along the pull wire, the second position located a second distance proximal to the proximal crowns, and in which the distal basket, as measured at the proximal end of the distal basket, has a second height, the second distance greater than the first distance, the second heights less than the first height, and a distal collapsed state in which the open distal end of the coaxial sheath is located at a third position along the pull wire, the third position distal to the proximal crowns and located in the distal basket interior, and in which the distal basket, as measured at the proximal end of the distal basket, has a third height, the third height less than the first height, wherein the catheter is configured to envelope the distal basket when the distal basket is in the proximal collapsed state; wherein the distal basket is configured to move from the relaxed state to the proximal collapsed state by moving the open distal end of the coaxial sheath proximally to the second position while keeping the distal basket at a fixed location along the pull wire; and wherein the distal basket is configured to move from the relaxed state to the distal collapsed state by moving the open distal end of the coaxial sheath distally to the third position while keeping the distal basket at a fixed location along the pull wire; further wherein the distal end of the distal basket is fixed relative to the pull wire; and further wherein, in the distal collapsed state, the proximal end of the distal basket is substantially closed.