Nerve cuff electrodes fabricated using over-molded lcp

Abstract

An electrode lead may comprise a flexible circuit that includes a planar dielectric substrate including an elongated lead substrate portion having opposing ends, an electrode carrying substrate portion disposed on one end of the lead substrate portion, and a connector substrate portion disposed on the other end of the lead substrate portion, wherein the lead substrate portion is pre-shaped into a three-dimensional structure. The flexible circuit may further include an electrically conductive trace extending from the connector substrate portion to the electrode carrying substrate portion, a first window formed in the connector substrate portion to expose the electrically conductive trace to form a connector pad, and a second window formed in the electrode carrying substrate portion to expose the electrically conductive trace to form an electrode pad. The electrode lead may further comprise a lead connector that incorporates the connector substrate portion.

Description

RELATED APPLICATION[0001]This application is a continuation of co-pending U.S. Provisional Patent Application Ser. No. 62 / 415,028, filed Oct. 31, 2016, which is expressly incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention generally relates to implantable neurostimulation leads, and specifically relates to implantable nerve cuff electrodes that can be used to stimulate nerves.BACKGROUND OF THE INVENTION[0003]Nerve cuff electrodes are conventionally manufactured using implantable grade silicone or, in some cases, polyurethane. Nerve cuff electrodes generally comprise a lead body, a connector proximally located on the lead body, a cuff body distally located on the lead body, electrode contacts placed on the inner surface of the cuff body, and electrical conductors extending from the cuff body through the lead body to the connector. The method of making these nerve cuffs electrodes is typically time consuming, since the conductors and electrode contacts i...

AI Technical Summary

Benefits of technology

The present invention provides electrode leads and flexible circuits with improved design features. The leads and circuits have an elongated planar lead body with a connector at one end and an electrode carrying structure at the other end. The lead body may have a slit to form planar strands, which can be pre-shaped into a helical or sigmoid structure. The electrode contacts are affixed to the loose ends of the planar strands. The flexible circuits may also have an outer layer of insulative material. The invention allows for improved flexibility and better placement of electrodes for neurostimulation.

Problems solved by technology

The method of making these nerve cuffs electrodes is typically time consuming, since the conductors and electrode contacts in the cuff body are overmolded using molds.

This entire process for making a nerve cuff electrode is time and labor intensive and therefore adds to the final cost of the finished lead with nerve cuff electrode.

However, due to its planar nature, the use of LCP as a substrate in nerve cuff electrodes, and medical leads in general, provides several challenges.

Second, the lead ports for conventional neurostimulation devices are generally cylindrical, thereby making the mechanical and electrical transition from planar LCP-based leads to such neurostimulation devices particularly challenging.

Third, because the edges of LCP substrates tend to be sharp, such LCP substrates may need to be over-molded with a softer material, such as silicone.

However, because there are only two sides of the LCP substrate on which the silicone can be adhered to, the silicone may be prone to delamination from the LCP substrate.

Additionally, for the same reason, electrodes disposed on one of these planar surfaces of the LCP substrate may also be prone to delamination from the LCP substrate.

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