Apparatus for rezeroing an in vivo pressure sensor and method for rezeroing
First Claim
1. A catheter sensor assembly for rezeroing a physiological pressure sensor during measurement of in vivo physiological pressure comprising:
- a) a member comprising a distal end to ease placement of the catheter sensor assembly in an in vivo site, an intermediate part and a proximal end for fluid connection of the member with a tube having a lumen which extends from the proximal end;
b) a passage in the intermediate part opened in a first direction, the passage extending through the proximal end and across the intermediate part;
c) a pressure responsive sensor carried upon said member for covering and sealing the passage, the sensor having a first side facing the first direction away from the intermediate part for exposure to in vivo physiological pressure, the sensor having a second side opposite the first side, the second side in fluid communication with the passage and the lumen; and
d) a pressure connecting means connected to the lumen for inhibiting liquid communication with the lumen and arranged for selective communication with a catheter in fluid communication with the first side to transmit the physiological pressure through the pressure connecting means, a circuitous path in the pressure connecting means for inhibiting liquid communication to isolate the first and the second sides of the sensor from liquid communication so that the pressure on the first and second sides of the sensor can be substantially equalized while inhibiting liquid communication during determination of a datum value of a signal from the sensor of the equalized pressure of the in vivo sensor.
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Accused Products
Abstract
A sensor assembly for an in vivo physiological pressure measurement has a member with a distal end to ease placement of the catheter sensor assembly in vivo. A passage is preferably in an intermediate part of the member and is open but covered by a pressure responsive sensor sealing the passage. The sensor has a first side away from the intermediate part for exposure to in vivo physiological pressure and a second side in fluid communication with the passage. A pressure connecting means for inhibiting liquid communication located between the physiological pressure and the passage is arranged for selectively connection therebetween so that when connected the pressure on the first and second sides of the sensor can be substantially equalized. A control ex vivo makes the selective connection of the second side of the pressure sensor and the physiological pressure. A method for rezeroing an in vivo pressure sensor has the steps of obtaining a signal from the first side of the sensor at distal end, using a pressure substantially equal to the in vivo pressure and applying that pressure to the second side of the sensor.
60 Citations
20 Claims
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1. A catheter sensor assembly for rezeroing a physiological pressure sensor during measurement of in vivo physiological pressure comprising:
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a) a member comprising a distal end to ease placement of the catheter sensor assembly in an in vivo site, an intermediate part and a proximal end for fluid connection of the member with a tube having a lumen which extends from the proximal end; b) a passage in the intermediate part opened in a first direction, the passage extending through the proximal end and across the intermediate part; c) a pressure responsive sensor carried upon said member for covering and sealing the passage, the sensor having a first side facing the first direction away from the intermediate part for exposure to in vivo physiological pressure, the sensor having a second side opposite the first side, the second side in fluid communication with the passage and the lumen; and d) a pressure connecting means connected to the lumen for inhibiting liquid communication with the lumen and arranged for selective communication with a catheter in fluid communication with the first side to transmit the physiological pressure through the pressure connecting means, a circuitous path in the pressure connecting means for inhibiting liquid communication to isolate the first and the second sides of the sensor from liquid communication so that the pressure on the first and second sides of the sensor can be substantially equalized while inhibiting liquid communication during determination of a datum value of a signal from the sensor of the equalized pressure of the in vivo sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A catheter sensor assembly for rezeroing a physiological pressure sensor during measurement of in vivo physiological pressure comprising:
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a) a member comprising a distal end to ease insertion of the catheter sensor assembly in an in vivo site and a proximal end for fluid connection of the member with a lumen of a tube, the distal end and the proximal end joined by an intermediate part; b) a passage in the intermediate part opened in a first direction and extending through the proximal end and across the intermediate part; c) a sensor carried upon and overlying the passage, the sensor having a first side facing the first direction away from the intermediate part for exposure to in vivo pressure, the sensor having a second side opposite the first side wherein the second side is in fluid communication with the passage and the lumen; d) a circuitous path arranged for selective connection to a catheter to provide pressure communication between the first and second sides and fashioned to prohibit flow of liquid but permit concurrent application of in vivo physiological pressure to the first and second sides; and e) a control having a portion for selective operation to connect or disconnect the catheter and the tube to the circuitous path and located between the catheter and the circuitous path, the control being ex vivo so that the in vivo pressure can be remotely applied to the first and second sides of the sensor during determination of a datum value of pressure when the sensor remains in vivo. - View Dependent Claims (12, 13, 14, 15)
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16. A method for rezeroing an in vivo pressure sensor comprising the steps of:
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a) obtaining a signal from an in vivo side of a sensor at the distal end of a lumen of an in vivo tube, the sensor having a first side exposed to a physiological pressure; b) transmitting a pressure substantially equal to the physiological pressure through a catheter to the sensor and through a circuitous path; c) applying the pressure in the circuitous path to the lumen to equalize the pressure on a second side of the sensor opposite to the first side; and determining the signal with balanced pressure applied to the first and second sides of the in vivo sensor for use in correcting for zero offset. - View Dependent Claims (17, 18, 19, 20)
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Specification