Barrier coating on blood contacting devices
AssigneeBecton, Dickinson and Company
InventorsMaylon S. Taylor, II, Joel L. Williams
Life of this patent
Estimating the term…
Abstract
A blood pressure monitoring device includes a pressure sensing element mounted or a probe tip or in a catheter tip adapted for insertion into a patient's blood stream. The element includes a pressure transducer having a micromachined diaphragm which flexes in response to pressure changes. The flexes are converted by the transducer to electrical signals which pass back through the catheter to a display. The element and the catheter are conformally coated with a thin layer of parylene which insulates the device from the deleterious effects which blood components such as water and ions would otherwise have on various components of the device.
Claims16
A blood pressure monitoring device comprising:
- (a) A silicon pressure transducer including an integral micromachined diaphragm forming the bottom wall of said transducer, said diaphragm flexing in response to a change in blood pressure exerted on a first side of said diaphragm, said transducer converting said change in pressure to an electrical signal;
- (b) a flexible polymeric tubing having said element mounted in a distal end thereof, said tubing enclosing conducting means for conducting said signal away from said transducer;
- and
- (c) a parylene coating on said transducer and at least a portion of said tubing, said coating insulating said transducer and conducting means from water vapor and ions when said device is placed in a patient's blood stream for up to eight days and longer.
The device of claim wherein said conducting means is a wire.
A pressure monitoring device comprising:
- (a) a sensing element including a silicon transducer, said transducer converting a pressure change sensed by said element to a signal related to said pressure;
- (b) a flexible polymeric tubing having said element mounted therein, said tubing enclosing means for conducting said signal away from said transducer;
- and
- (c) a parylene coating on said element and at least a portion of said tubing thereby insulating said element and means for conducting from the external environment.
A blood pressure monitoring device comprising:
- (a) a pressure sensing element including a silicon transducer having an integral micromachined diaphragm no more than 10 microns thick forming the bottom wall of said transducer, and diaphragm flexing in response to a change in pressure exerted by a patient's blood stream in contact with a first side of said diaphragm, said diaphragm converting said change in pressure to an electrical signal;
- (b) a flexible polyurethane tubing having said element mounted in a distal end thereof, said tubing enclosing a wire for conducting said signal from said transducer to a display connected to a proximal end of said tubing;
- (c) a conduit within said tubing establishing air communication between a second side of said diaphragm and the interior of said tubing;
- and
- (d) a parylene-C coating vapor deposited on said element and at least a portion of said tubing, said coating insulating said element and wire from water vapor and ions for up to eight days and longer when said device is placed in a patient's blood stream.
Dependencies are inferred from the claim text.