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Medical device with liquid filled housing

a technology of liquid-filled housing and medical devices, which is applied in the field of medical devices including liquid-filled housings, can solve the problem of the volume of the housing that remains unused

Inactive Publication Date: 2009-11-19
CARDIAC PACEMAKERS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]Embodiments of the invention are related to medical devices filled with a liquid composition, amongst other things. In an embodiment, the invention includes a hermetically sealed housing defining an interior volume, a component module within the housing, and a liquid composition disposed within the residual volume of the housing. Embodiments here

Problems solved by technology

Frequently, there is some amount of the volume of the housing that remains unused after the device components are placed within the housing.

Method used

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  • Medical device with liquid filled housing
  • Medical device with liquid filled housing
  • Medical device with liquid filled housing

Examples

Experimental program
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Methods

[0042]Various methods can be used to fill the residual volume of a hermetically sealed housing. In some embodiments, an aperture or hole is formed in the housing in order to allow the insertion of a liquid composition. The hole location(s) for each device can be selected to avoid potential contact with internal electronic components and to facilitate removal of any air bubbles. In other embodiments, the liquid can be in place before the housing is fully formed. By way of example, the component module can be disposed within a bath of the liquid composition and then the housing can be welded in place around the component module within the bath.

[0043]In embodiments where an aperture or apertures are formed in the housing, the liquid composition can be introduced into the interior volume by submersing the housing in the liquid composition. In some embodiments, a syringe or similar instrument can be used to inject the liquid composition into the housing.

[0044]In embodiments where ...

example 1

Device HALT (Highly Accelerated Life Test) Testing Performance

[0046]CRM devices with titanium housings (RENEWAL DS, Boston Scientific Corporation, Natick, Mass.) were obtained and used for HALT testing. Holes (1.58 mm) were milled in the titanium housings. A liquid composition (perfluorodecalin, FLUOROMED APF-140HP) was inserted into the housing through the holes. Specifically, the device were immersed in the liquid composition. A syringe was also used to insert the liquid composition. The housings were then sealed by welding a titanium sphere over the hole or by welding a titanium patch over the hole.

[0047]The liquid composition-filled devices were then tested in a HALT testing chamber. The conditions were ˜80° C. and vibration of 60 Grms. The test duration was between 8 and 14 hours. The objective was to assess and compare the durability of the liquid filled devices in comparison with similar gas filled devices in response to vibration forces.

[0048]Data for the liquid filled devic...

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PUM

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Abstract

Embodiments of the invention are related to medical devices filled with a liquid composition, amongst other things. In an embodiment, the invention includes a hermetically sealed housing defining an interior volume, a component module disposed within the interior volume, the component module comprising a circuit board, the component module displacing a portion of the interior volume. A liquid composition can be disposed within the housing, the liquid composition filling at least 80% of the interior volume not displaced by the component module. Other embodiments are also included herein.

Description

[0001]This application claims the benefit of U.S. Provisional Application No. 61 / 053,157, filed May 14, 2008, the content of which is herein incorporated by reference.TECHNICAL FIELD[0002]This disclosure relates generally to medical devices and, more particularly, to medical devices including a liquid filled housing, amongst other things.BACKGROUND OF THE INVENTION[0003]Some medical devices include a housing that holds and protects electronic components. By way of example, implantable cardiac rhythm management (CRM) devices such as pacemakers and implantable cardioverter defibrillators frequently include a housing that hermetically seals off an interior volume. Components, such as electronic components, used to generate and control electrical stimulation pulses are then disposed within the hermetically sealed interior volume of the housing.[0004]Frequently, there is some amount of the volume of the housing that remains unused after the device components are placed within the housing...

Claims

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Application Information

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IPC IPC(8): A61N1/36
CPCA61N1/375A61N1/362A61N1/3968A61N1/37512
Inventor DAHL, SCOTTTANGREN, JOHN H.ELY, KEVIN J.BRANDNER, DOUGLAS J.LINDER, WILLIAM J.
Owner CARDIAC PACEMAKERS INC