Medical device with liquid filled housing

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.

1 . An implantable medical device comprising:
 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; and   a liquid composition disposed within the housing, the liquid composition filling at least 80% of the interior volume not displaced by the component module.   
   
   
       2 . The implantable medical device of  claim 1 , wherein the pressure within the interior volume is greater than 760 mmHg. 
   
   
       3 . The implantable medical device of  claim 1 , wherein the pressure within the interior volume is greater than 800 mmHg. 
   
   
       4 . The implantable medical device of  claim 1 , the biocompatible liquid composition comprising a liquid at temperatures between −50 degrees Celsius and 150 degrees Celsius and at pressures between about 380 mm Hg and 2280 mm Hg. 
   
   
       5 . The implantable medical device of  claim 1 , the device comprising between about 1 ml and 3 ml of the liquid composition. 
   
   
       6 . The implantable medical device of  claim 1 , wherein the liquid composition is biocompatible. 
   
   
       7 . The implantable medical device of  claim 1 , the liquid composition comprising a material selected from the group consisting of fluorocarbons, hydrofluoroethers, silicone oils, mineral oils, and esters. 
   
   
       8 . The implantable medical device of  claim 1 , the liquid composition comprising a perfluorocarbon. 
   
   
       9 . The implantable medical device of  claim 1 , the liquid composition comprising a material selected from the group consisting of perfluorodecalin and 1-bromoperfluorooctane. 
   
   
       10 . The implantable medical device of  claim 1 , the liquid composition comprising a liquid material with a dielectric strength of greater than about 0.5 kV/mm. 
   
   
       11 . The implantable medical device of  claim 1 , the liquid composition comprising a liquid material with a dielectric strength of greater than about 5 kV/mm. 
   
   
       12 . The implantable medical device of  claim 1 , the liquid composition comprising a liquid materials with a kinematic viscosity of less than about 1000 cSt at 25 degrees Celsius. 
   
   
       13 . The implantable medical device of  claim 1 , the liquid composition comprising a liquid material with a coefficient of thermal expansion of less than about 0.01 per degree Celsius. 
   
   
       14 . The implantable medical device of  claim 1 , the liquid composition filling at least 95% of the interior volume not displaced by the component module. 
   
   
       15 . The implantable medical device of  claim 1 , the liquid composition filling at least 99% of the interior volume not displaced by the component module. 
   
   
       16 . The implantable medical device of  claim 1 , the housing comprising an electrically conductive material. 
   
   
       17 . The implantable medical device of  claim 16 , the electrically conductive material comprising titanium. 
   
   
       18 . The implantable medical device of  claim 1 , the electronics module configured to generate an electrical stimulation pulse. 
   
   
       19 . The implantable medical device of  claim 1 , further comprising an electrical conductor in electrical communication with the component module, the hermetically sealed housing comprising a housing wall, the electrical conductor passing across the housing wall. 
   
   
       20 . An implantable medical device comprising:
 a hermetically sealed housing defining an interior volume, the pressure within the interior volume greater than 760 mm Hg;   an electronics module disposed within the housing, the electronics module displacing a portion of the interior volume, the difference between the interior volume and the portion displaced by the electronics module comprising a residual volume; and   a liquid composition disposed within the housing, the liquid composition filling at least 90% of the residual volume.   
   
   
       21 . An implantable medical device comprising:
 a header module;   a hermetically sealed housing defining an interior volume, the pressure within the interior volume greater than 760 mm Hg, the housing coupled to the header module;   an electronics module disposed within the housing, the electronics module displacing a portion of the interior volume;   an electrical conductor providing electrical communication between the electronic module and the header module; and   a liquid composition disposed within the housing, the liquid composition filling at least 90% of a residual volume of the housing.