Interventional medical systems, catheters, and methods

Patent metadata

Field	Value
Publication number	US-10758729-B2
Application number	US-201514872770-A
Country	US
Kind code	B2
Filing date	Oct 1, 2015
Priority date	Oct 1, 2015
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

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.

First claim

We claim:

1. An interventional medical system comprising:
an implantable medical device that includes 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;
a catheter that includes 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
a retrieval tool that includes 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;
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.

2. The system of claim 1 , wherein:
the collapsible spring-biased perimeter sidewall of the capture member of the retrieval tool shaft assembly defines a flared outer surface of the capture member, when the distal-most opening of the passageway defined thereby is at the spring-biased diameter; and
a length of the capture member passageway is approximately equal to an overall length of the medical device.

3. The system of claim 2 , wherein the collapsible spring-biased perimeter sidewall comprises a flexible polymer mesh supported by a plurality of spring-biased ribs, a proximal end of each rib defining the proximal end of the perimeter sidewall, and the rib proximal ends being spaced apart from one another around a circumference of the tubular sidewall of the retrieval tool shaft assembly.

4. The system of claim 1 , wherein:
the spring-biased diameter of the distal-most opening of the capture member passageway of the retrieval tool shaft assembly is 2 to 5 times greater than the diameter of the distal-most opening of the device receptacle of the catheter; and
the collapsible spring-biased perimeter sidewall of the capture member comprises a flexible polymer mesh supported by a plurality of spring-biased ribs, a proximal end of each rib defining the proximal end of the perimeter sidewall, and the rib proximal ends being spaced apart from one another around a circumference of the tubular sidewall of the retrieval tool shaft assembly.

5. The system of claim 4 , further comprising:
a vacuum source adapted for coupling to the retrieval tool shaft assembly, so that suction can be applied through the lumen defined by the tubular sidewall and through the capture member passageway of the retrieval tool shaft assembly; and
wherein a length of the capture member passageway is approximately equal to an overall length of the medical device.

6. The system of claim 1 , wherein the retrieval tool shaft assembly further comprises a steering subassembly; and wherein the steering subassembly comprises an elongate pull wire, a pull band, and an actuator, the pull wire extending along a length of the tubular sidewall of the shaft assembly from a proximal end of the wire to a distal end of the wire, the pull band being mounted to a distal end of the tubular sidewall of the shaft assembly, in proximity to the capture member, and being coupled to the distal end of the pull wire, and the actuator being mounted to a handle of the retrieval tool and being coupled to the proximal end of the pull wire.

7. The system of claim 6 , wherein the pull band is configured to deflect the shaft assembly to align the passageway of the perimeter sidewall with the attachment feature when the attachment feature is not aligned with the device receptacle.

8. The system of claim 7 , wherein:
the steering assembly is a first steering assembly;
the pull wire is a first pull wire;
the pull band is a first pull band;
the actuator is a first actuator; and
the catheter further comprises a second steering assembly that comprises:
a second elongate pull wire that extends along the shaft of the catheter from a proximal end of the second pull wire to a distal end of the second pull wire;
a second pull band mounted in proximity to the distal end of the shaft of the catheter and coupled to the distal end of the second pull wire; and
a second actuator mounted to a handle of the catheter and being coupled to the proximal end of the second pull wire, wherein the second steering assembly is configured to deflect the distal end of the shaft when the second actuator is moved.

Assignees

• Medtronic Inc

Inventors

• Mcdonnell Paula
• Geraghty Brendan P
• Francis Gwenda
• Wood Rónán
• Ward Sean
• Mchugh Pat
• Kelly Tomas K

Classifications

• A61N1/362 Primary

  Heart stimulators (heart defibrillators A61N1/39) · CPC title

• A61N2001/058

  Fixing tools · CPC title

• A61N1/057

  Anchoring means; Means for fixing the head inside the heart · CPC title

• A61N2001/0578

  having means for removal or extraction · CPC title

• A61N1/3756

  Casings with electrodes thereon, e.g. leadless stimulators · CPC title