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Interventional medical systems and associated assemblies and methods

  • US 10,398,892 B2
  • Filed: 07/21/2016
  • Issued: 09/03/2019
  • Est. Priority Date: 07/21/2016
  • Status: Active Grant
First Claim
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1. An interventional medical system comprising an implantable medical device and a catheter assembly;

  • the implantable medical device comprising an electronic controller, a hermetically sealed housing containing the controller, an electrode electrically coupled to the controller, and a fixation member mounted to a distal end of the housing;

    the catheter assembly comprising an elongate inner tubular member, an elongate outer tubular member, and an end-cap subassembly;

    the outer tubular member defining an elongate lumen in which the inner tubular member extends, the outer tubular member extending from a proximal end of the outer tubular member to a distal terminal end of the outer tubular member, the distal terminal end of the outer tubular member defining a distal-most opening of the elongate lumen, the elongate lumen, in proximity to the distal-most opening, being sized to contain an entirety of the implantable medical device therein, and the distal-most opening allowing passage of the implantable medical device therethrough;

    the inner tubular member including a distal end of the inner tubular member configured to engage with a proximal end of the implantable medical device, and the inner tubular member being moveable through the elongate lumen defined by the outer tubular member; and

    the end-cap subassembly of the catheter assembly comprising;

    a cap including a proximal end of the cap, a distal end of the cap, a first portion extending from the proximal end of the cap, a second portion extending from the distal end of the cap, and a transition zone extending between the first and second portions, the first portion having a girth sized to fit within the distal-most opening of the lumen of the outer tubular member, the second portion having a girth that tapers from a first size at the transition zone to a second, smaller size at the distal end, the girth of the second portion at the transition zone being too large to fit within the distal-most opening of the elongate lumen defined by the outer tubular member; and

    a spring-biased tethering member extending within the catheter assembly, a distal end of the spring-biased tethering member being coupled to the cap so that the tethering member extends from the proximal end of the cap, the tethering member being configured extend alongside the implantable medical device when the implantable medical device is contained in the lumen of the outer tubular member; and

    wherein, when the first portion of the cap extends within the distal-most opening of the elongate lumen of the outer tubular member, the catheter assembly constrains the spring-biased tethering member in a spring-loaded first configuration;

    wherein, when the outer tubular member is retracted relative to the spring-biased tethering member the cap is separated from the distal-most opening of the elongate lumen of the outer tubular member and the spring-biased tethering member is released to extend out from the distal-most opening and to a second configuration in which the spring-biased tethering member holds the cap in an open position, at which an entirety of the cap is laterally offset from the distal-most opening; and

    wherein, when in the second configuration, the spring-biased tethering member has a pre-formed curvature comprising a plurality of bends, at least two of the plurality of bends in different directions.

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