INTERVENTIONAL MEDICAL SYSTEMS, CATHETERS, AND METHODS

摘要

In a system for retrieving an implanted device, a flared inner surface of a catheter tubular sidewall may define a distal-most opening of a device receptacle; the opening has a first diameter equal to that of the receptacle, and a second diameter, coincident with a distal-most edge of the tubular sidewall, and at least 5% greater than the receptacle diameter. Alternately, a retrieval tool in sliding engagement within a lumen of a catheter includes a shaft assembly, through which a snare member passes, and which includes a collapsible spring-biased perimeter sidewall; the sidewall defines a capture member passageway approximately coaxial, and in fluid communication with a lumen of the shaft assembly. A distal-most opening of the passageway has a spring-biased diameter that is greater than that of a distal-most opening of a device receptacle of the catheter, and a collapsed diameter that is less than the receptacle distal-most opening diameter.

主权项

1. An interventional medical system comprising an implantable medical device, a catheter, and a retrieval tool; the medical device comprising an electronic controller, a hermetically sealed housing containing the controller, an electrode electrically coupled to the controller and mounted in proximity to a distal end of the housing, an attachment feature joined to a proximal end of the housing, and a fixation member mounted to the distal end of the housing; the catheter comprising an elongate shaft and a device receptacle joined to a distal end of the shaft, the shaft including a longitudinally extending lumen, and the device receptacle being sized to contain the medical device therein and having a distal-most opening that allows passage of the medical device therethrough, and the device receptacle being in fluid communication with the shaft lumen; and the retrieval tool comprising an elongate snare member and a shaft assembly, the shaft assembly comprising an elongate tubular sidewall that defines a lumen configured to receive passage of the snare member therethrough, the elongate tubular sidewall configured for sliding engagement within the lumen of the catheter shaft; and wherein the shaft assembly of the retrieval tool further comprises:
a capture member comprising a collapsible spring-biased perimeter sidewall, the perimeter sidewall defining a passageway that is approximately coaxial, and in fluid communication with the lumen of the tubular sidewall of the retrieval tool shaft assembly, the perimeter sidewall extending from a proximal end thereof to a distal end thereof, the proximal end being coupled to the tubular sidewall of the shaft assembly, and the distal end defining a distal-most opening of the passageway; and wherein the distal-most opening of the capture member passageway has a spring-biased diameter that is greater than a diameter of the distal-most opening of the device receptacle of the catheter; the distal-most opening of the capture member passageway has a collapsed diameter that is less than the diameter of the device receptacle distal-most opening, when the capture member is received within the device receptacle; and the capture member passageway is sized to contain the attachment member of the medical device and the proximal end of the medical device housing.