Device and method for measuring volumetric blood flow in a vessel
First Claim
1. In a device for measuring volumetric blood flow in a vessel, a catheter having proximal and distal extremities, a balloon carried by the distal extremity, a balloon inflation lumen carried by the catheter, a toroidal ultrasonic transducer carried by the catheter spaced proximally of the balloon, means for supplying electrical energy to the transducer, the transducer being provided with means for producing a large substantially uniform beam to illuminate a vessel of approximately three centimeters in diameter with ultrasonic energy.
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Accused Products
Abstract
Device for measuring volumetric blood flow in a vessel comprising a catheter having proximal and distal extremities. A balloon is carried by the distal extremity of the catheter. A balloon inflation lumen is carried by the catheter and is in communication with the balloon. A toroidal ultrasonic transducer is carried by the catheter and is spaced proximally of the balloon. Electrical circuitry is provided for supplying electrical energy to the transducer. The transducer produces a large substantially uniform beam of ultrasonic energy to illuminate a vessel of approximately three centimeters in diameter with the ultrasonic energy.
164 Citations
17 Claims
- 1. In a device for measuring volumetric blood flow in a vessel, a catheter having proximal and distal extremities, a balloon carried by the distal extremity, a balloon inflation lumen carried by the catheter, a toroidal ultrasonic transducer carried by the catheter spaced proximally of the balloon, means for supplying electrical energy to the transducer, the transducer being provided with means for producing a large substantially uniform beam to illuminate a vessel of approximately three centimeters in diameter with ultrasonic energy.
- 5. In a device for measuring volumetric blood flow in a vessel, a catheter having proximal and distal extremities, a balloon carried by the distal extremity, a balloon inflation lumen carried by the catheter, a toroidal ultrasonic transducer carried by the catheter spaced proximally of the balloon, means for supplying electrical energy to the transducer, the transducer being provided with means for producing a large substantially uniform beam to illuminate a vessel of approximately three centimeters in diameter with ultrasonic energy, said catheter being provided with a transition and with a first portion having a first diameter extending to the transition and a second portion extending from the transition having a second diameter which is less than the diameter of the first portion said transducer being disposed at the transition between the first portion and the second portion.
- 11. In a device for measuring volumetric blood flow in a vessel, a catheter having proximal and distal extremities, said catheter being provided with a first portion having a first diameter and a second portion having a second diameter which is less than the diameter of the first portion, said second portion being movable axially of said first portion and having a distal extremity, a balloon carried by the distal extremity of said second portion, a balloon inflation lumen carried by the catheter, a toroidal transducer carried by the catheter spaced proximally of the balloon and means for supplying electrical energy to the transducer, the transducer producing a large substantially uniform beam to illuminate a vessel of approximately three centimeters in diameter.
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17. A method for simultaneously measuring cardiac output and pulmonary wedge pressure by positioning a device for measuring volumetric blood flow in a vessel, the device comprising a catheter having proximal and distal extremities, said catheter being provided with a first portion having a first diameter and a second portion having a second diameter which is less than the diameter of the first portion, said second portion being movable axially of said first portion and having a distal extremity, a balloon carried by the distal extremity of said second portion, a balloon inflation lumen carried by the catheter, toroidal transducer carried by the catheter spaced proximally of the balloon and means for supplying electrical energy to the transducer, the transducer producing a large substantially uniform beam to illuminate a vessel of approximately three centimeters in diameter, the method comprising positioning the device such that the distal extremity of the second portion is located in the distal pulmonary artery and measuring pulmonary wedge pressure while the transducer is situated within the main pulmonary artery measuring cardiac output.
Specification