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Heat Shield for Implantable Medical Device

IP.com Disclosure Number: IPCOM000021060D
Publication Date: 2003-Dec-18
Document File: 1 page(s) / 22K

Publishing Venue

The IP.com Prior Art Database

Related People

Michael S. Colvin: INVENTOR [+2]

Abstract

Many implantable medical devices are powered by an internal primary or secondary battery. These batteries can experience an internal short circuit, which can lead to uncontrolled thermal changes reaching temperatures well above 100 degrees Celsius. Wrapping or coating the battery with a thermal barrier can significantly reduce the peak temperatures experienced, e.g., by body tissues surrounding a medical device, in the event of an internal battery short and also during normal operation of the medical device. It is also possible to place thermal barriers in other positions within or on the medical device.

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Heat Shield for Implantable Medical Device

Many implantable medical devices are powered by an internal primary or secondary battery. It is possible for these batteries to experience an internal short circuit, and for such a short circuit to lead to uncontrolled thermal changes (“thermal runaway”), even reaching temperatures well above 100 degrees Celsius. These thermal events can heat the case of the implantable medical device to temperatures well above body temperature, causing tissue damage, necrosis, etc.

Wrapping or coating the battery with a thermal barrier can prevent or limit such tissue damage. For instance, tape or paper such as 3M™ Nextel™ Flame Stopping Dot Paper 312 (made from 3M™ Nextel™ Ceramic Fiber 312), clay-like compound such as Heat Shielding Compound (available from www.smallparts.com), or liquid such as Protective Ceramic Coating (developed by NASA’s Ames Research Center and marketed as Wessex Emmisshield™ by Rabb Global Technologies or Mooresville, North Carolina), or similar, may be wrapped around or applied to the surface of the battery. Additionally or alternatively, the thermal barrier may be used in other locations within the medical device.

These thermal barriers can significantly reduce the peak temperatures experienced, e.g., by body tissues surrounding a medical device, in the event of an internal battery short and also during normal operation of the medical device. For instance, use of thermal barriers can reduce the peak tempe...