Patent ID: 7734349
Filing Date: 2010-06-08
Classification: A61B,A61N,G01N

Abstract:
1. An implantable osmotic heart monitoring system comprising: an osmotic pH sensor, the osmotic pH sensor configured to generate a signal corresponding to pH of a bodily fluid, the osmotic pH sensor comprising a wall member defining an enclosed volume, the wall member comprising a semi-permeable membrane; and a solution comprising a solvent and a solute, the solution disposed within the enclosed volume, the solute configured to change osmotic strength in a pH range of between about 7.3 and about 7.5, and the solute having a pKa of between about 6.0 and about 10.0; the semi-permeable membrane permeable to the solvent and impermeable to the solute; and a controller in communication with the osmotic pH sensor.