OCCLUSIVE IMPLANT AND METHODS OF MAKING AN OCCLUSIVE FABRIC HAVING SHAPE MEMORY CHARACTERISTICS

Smart overview of the Invention

An occlusive implant is designed to transition between collapsed and expanded states, featuring an occlusive fabric with shape memory characteristics. This fabric changes from a first to a second configuration upon exposure to a specific stimulus. The manufacturing process involves intertwining filaments into the fabric, establishing a permanent shape in the second configuration, and heat setting the fabric in the first configuration. Additionally, a method for creating shape memory yarn includes forming a core filament and helically wrapping it with a shape memory filament made from a shape memory polymer.

Technical Field

The invention pertains to medical devices, specifically focusing on occlusive implants that incorporate a fabric with shape memory properties. These implants are relevant for addressing medical conditions such as atrial fibrillation, where they help prevent thrombi formation in the left atrial appendage of the heart. The fabric's ability to change configurations when stimulated is crucial for its function in medical applications.

Background

The left atrial appendage plays a role in cardiac function by aiding blood flow between the heart's chambers. In atrial fibrillation patients, this appendage may not function properly, leading to blood pooling and thrombi formation, which can cause strokes or heart attacks. Medical devices that close off the left atrial appendage can help prevent these complications. The occlusive implant discussed offers an alternative approach to existing devices and methods.

Summary of Features

The occlusive fabric within the implant is composed of filaments, some of which possess shape memory properties. These filaments can be distributed evenly, unevenly, or concentrated along the fabric's edge. The fabric contains pores that change size between configurations and may be coated with a shape memory polymer. The fabric is self-biased to favor certain configurations, influenced by stimuli like temperature or fluid contact.

Manufacturing Methods

The process of making the occlusive fabric involves intertwining filaments to form a material that reacts to specific stimuli. The fabric's permanent shape is defined in the second configuration, while a temporary shape is set through heat treatment. The shape memory yarn is produced by wrapping a core filament with a shape memory filament, which alters its configuration upon stimulus exposure. This innovative approach provides versatility in medical device manufacturing.