Detachment mechanism for a central venous access filter and method of use

摘要

A detachment and retrieval mechanism for a central venous access filter includes a catheter body, and an outer sheath concentrically disposed about the catheter body. The outer sheath and the catheter body are moveable relative to one another. A filter member includes a first end coupled to the catheter body and a second end movable relative to the catheter body. The first end may have a collar that is immovably coupled to the catheter body in a first state and movably coupled to the catheter body upon transition to a second state.

主权项

1. A method of use for a detachment mechanism for a central venous access filter system having a catheter body, an outer sheath concentrically disposed about the catheter body wherein the catheter body and the outer sheath are moveable relative to one another, and a filter member having a first end coupled to the catheter body via a shape memory detachment mechanism and a second end movable relative to the catheter body, the shape memory detachment mechanism having a first state that immovably couples the first end of the filter member to the catheter body and a second state that removably couples the first end of the filter member to the catheter body, the method comprising the steps of:
a. deploying the filter member within a blood vessel such that the filter member remains attached to the catheter body and has an enlarged diametric opening which opens facing a patient's blood flow and capturing embolic material within the opened filter member; and b. triggering a change of state of the shape memory detachment mechanism from its first state to its second state thereby releasing the filter member from the catheter body.