Detection of pressure waves transmitted through catheter/lead body
First Claim
1. An implantable medical device having a system comprising detecting and processing electronic circuitry housed therein for detecting pressure waves emanating from a site in the patient'"'"'s body through a catheter extending to the site for use in measuring a body function or modifying the operation of said implantable medical device and wherein said device is connected tosaid catheter having an elongate body extending between a proximal connector end which is connected to said device and a distal end comprised of non-fluid but flexible materials adapted to be placed at said body site so that a pressure wave at the body site is transmitted through said catheter body in response to a body function;
- bya connector assembly of the implanted medical device for attachment with said catheter proximal connector end;
said system further characterized by having;
a pressure wave transducer mounted in said connector assembly so as to be in operative relation with a non fluid portion of said proximal connector end for detecting said pressure wave and providing a pressure wave signal representative thereof to said implantable medical device.
0 Assignments
0 Petitions
Accused Products
Abstract
In an implanted medical device, a method and apparatus for detecting pressure waves caused by movement of a body organ, muscle group, limb or the like and transmitted through a catheter or lead body to the implanted medical device employing a pressure wave transducer mounted in relation to the proximal end of the catheter or lead to detect the transmitted pressure waves. The system may also include a reference transducer having the same pressure wave response characteristics as the pressure wave transducer but isolated from the proximal connector end for providing a reference signal including common mode pressure wave noise that both transducers are simultaneously subjected to. The pressure wave signal and the reference signal are preferably amplified, bandpass filtered to the body pressure wave of interest and stored, telemetered out or used to trigger a device operation. The pressure and reference wave transducers preferably are piezoelectric crystal transducers or accelerometers in direct or indirect mechanical contact with the proximal connector end of the catheter and is encapsulated from the body within a device connector assembly. Preferably, the catheter is a lead extending into direct or indirect contact with the patient'"'"'s heart. Cardiac pressure waves and respiration pressure waves are both transmitted proximally through the lead body to the pressure wave transducer. Pressure wave signals may be derived in parallel to detect particular characteristics of the cardiac and/or respiratory cycle to provide timing signal(s) for controlling the device operations.
193 Citations
18 Claims
-
1. An implantable medical device having a system comprising detecting and processing electronic circuitry housed therein for detecting pressure waves emanating from a site in the patient'"'"'s body through a catheter extending to the site for use in measuring a body function or modifying the operation of said implantable medical device and wherein said device is connected to
said catheter having an elongate body extending between a proximal connector end which is connected to said device and a distal end comprised of non-fluid but flexible materials adapted to be placed at said body site so that a pressure wave at the body site is transmitted through said catheter body in response to a body function; - by
a connector assembly of the implanted medical device for attachment with said catheter proximal connector end;
said system further characterized by having;a pressure wave transducer mounted in said connector assembly so as to be in operative relation with a non fluid portion of said proximal connector end for detecting said pressure wave and providing a pressure wave signal representative thereof to said implantable medical device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- by
-
12. An implantable medical device, having a system comprising detecting and processing electronic circuitry housed therein for detecting pressure waves emanating from a site in the patient'"'"'s body through a catheter extending to the site for use in making measurements of a body function so as to enable modifying the operation of said medical device at least in part based on said measurements comprising:
-
a catheter having an elongate non-liquid body extending between a proximal connector end and a distal end adapted to be placed at said body site so that a pressure wave at the body site is transmitted through said catheter body in response to a body function; a connector assembly of the implanted medical device for attachment with said proximal connector end; a pressure wave transducer mounted in operative relation with said proximal connector end for detecting said pressure wave and providing a pressure wave signal representative thereof to said implantable medical device; and wherein said processing means comprises a signal processing means to interpret said signal for use by said medical device. - View Dependent Claims (13, 14, 15, 16, 17, 18)
-
Specification