Medtronic, Inc.

Steven J Fischer

Bryan J Zart

James Strom

John E Nicholson

John C Mertz

Alexander O Lakanu

Michael D Fletcher

Alexandra M Koch

Apparatus and method according to the disclosure relate to minimizing gaps between a substantially planar cardiac-sensing electrode and a shroud member utilizing a so-called interference-fit. For example, a relatively recessed area or aperture formed in an exemplary resin-based shroud member has slightly reduced dimensions relative to the electrode and requires compression forces during assembly (e.g., manually or in an automated process including a press, a tool or other means). The interference-fit promotes a very tight fit (or seal) between the metallic electrode and the resin-based shroud member and, importantly, minimizes gaps. Additionally, discrete interference structures promote fluid tight seals between the electrode and a recess or aperture adapted to receive the electrode.

Interference-fit shroud-based cardiac electrodes

Apparatus and method for fabricating a shroud member having extra-cardiac sensing electrode. The assembly is used to provide a subcutaneous cardiac activity sensing device via at least a pair of electrodes mechanically coupled to the shroud member. In one embodiment only a major surface portion of the electrodes are exposed to body fluid and tissue. One beneficial aspect of the fabrication techniques herein involve the encapsulation of the elongated conductors and a majority of the electrode surfaces thereby reducing possibility for electrical shorting among the IMD housing and the other conductive members. The assemblies provided can be fabricated efficiently, inexpensively, quickly and easily using insert-molding techniques.

Insert molded shroud for implantable plate-type electrodes

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Star Prairie, WI, United States of America

Steven J Fischer