Intravascular blood parameter measurement system
First Claim
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1. An assembly for in vivo measurement of the concentration of oxygen in blood comprising:
- a fluorescent oxygen sensor means for sensing the concentration of oxygen in blood and providing a fluorescent oxygen signal in response thereto;
elongated optical transmission means optically coupled to said sensor means for transmitting the fluorescent oxygen signal from the sensor means proximally;
said sensor means being carried by a distal portion of the transmission means;
said sensor means and said transmission means being sized and adapted to be received within a blood vessel of a patient;
means for keeping the sensor means from contacting the wall of this vessel when the sensor means is within such vessel to thereby reduce the wall effect on the fluorescent oxygen signal; and
said keeping means spacing the sensor means from the wall of the vessel to allow blood to flow between the sensor means and the wall of the vessel.
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Abstract
A parameter of blood is sensed in vivo with a system which includes a catheter and a probe. The catheter has a lumen extending therethrough, a proximal end, a distal end and a distal opening at the distal end. The probe includes one or more sensors at its distal end. A saline solution is introduced into the lumen so that there is an interface adjacent the distal opening of the catheter between the blood and saline solution. The probe is received within the catheter and affixed thereto. The interface is moved back and forth in the lumen to expose the sensors to blood so that they can sense the blood parameters of interest.
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Citations
21 Claims
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1. An assembly for in vivo measurement of the concentration of oxygen in blood comprising:
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a fluorescent oxygen sensor means for sensing the concentration of oxygen in blood and providing a fluorescent oxygen signal in response thereto; elongated optical transmission means optically coupled to said sensor means for transmitting the fluorescent oxygen signal from the sensor means proximally; said sensor means being carried by a distal portion of the transmission means; said sensor means and said transmission means being sized and adapted to be received within a blood vessel of a patient; means for keeping the sensor means from contacting the wall of this vessel when the sensor means is within such vessel to thereby reduce the wall effect on the fluorescent oxygen signal; and said keeping means spacing the sensor means from the wall of the vessel to allow blood to flow between the sensor means and the wall of the vessel. - View Dependent Claims (2, 3, 4)
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5. A probe-catheter assembly comprising:
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a probe including a first sensor for sensing a parameter of blood and providing a signal in response thereto and elongated transmission means for transmitting the signal from the sensor proximally, said sensor being carried by a distal portion of the transmission means; a catheter having a lumen extending therethrough, a proximal end, a distal end and a distal opening at the distal end, a major length of said probe being receivable longitudinally in said lumen of said catheter with radial clearance to allow fluid flow therein and a length of the catheter being sized to be received within the cardiovascular system of a patient; and means for attaching the probe to the catheter at a location adapted to be outside the cardiovascular system of the patient such that the sensor is within the lumen adjacent the distal opening. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An assembly for in vivo measurement of the concentration of oxygen in blood comprising:
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a fluorescent oxygen sensor means for sensing the concentration of oxygen in blood and providing a fluorescent oxygen signal in response thereto; elongated optical transmission means optically coupled to said sensor means for transmitting the fluorescent oxygen signal from the sensor means proximally; said sensor means being carried by a distal portion of the transmission means; said sensor means and said transmission means being sized and adapted to be received within a vessel of a patient; means for keeping the sensor means from contacting the wall of said vessel when the sensor means is within such vessel to thereby reduce the wall effect on the fluorescent oxygen signal; and said keeping means including a catheter having a lumen extending therethrough, a proximal end, a distal end and a distal opening at the distal end, at least a portion of said transmission means being in said lumen with a radial clearance and means for attaching the transmission means to the catheter adjacent the proximal end of the catheter such that said oxygen sensor means is within the lumen adjacent the distal opening.
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Specification