Disposable calibration boot for multi-point calibration in fiber optic sensors
First Claim
1. A disposable calibration boot for an optical catheter having a distal end and having at least one optical means for emitting light radiation from the distal end and at least one optical means for receiving light radiation at the distal end, said disposable boot comprising:
- a body,a cavity defined in said body to receive the distal end of the optical catheter, said body shielding the distal end of the catheter from ambient light when the distal end is positioned within said cavity;
said body having a plurality of isolated compartments, each of said plurality of compartments containing a material having a known reflectivity to return a signal into the receiving optical means upon transmission of a known radiation from the emitting optical means,said body adapted to be positioned on the end of the optical catheter and being movable with respect thereto to position the distal end of the optical catheter adjacent each of said plurality of materials within said body such that the emitting and receiving optical means of the optical catheter selectively interacts individually with each of said plurality of materials to obtain separate backscattered signals from each of said plurality of materials within said calibration boot from light radiation caused to be emitted from the optical means of the optical catheter.
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Accused Products
Abstract
A calibration boot for use with an optical catheter includes a plurality of materials, each having a different reflectivity characteristic with respect to known wavelengths of light. The boot is positioned over the distal end of the optical catheter and light is emitted from the distal end of the optical catheter into one of the materials at a time. At each emission, the reflected or backscattered light is measured by a detector and a plurality of signals are obtained. The plurality of readings are used to calibrate the overall optical catheter and system. The use of a plurality of calibration signals improves the overall system accuracy, particularly where two or more variables are present in the measured parameter. In the preferred system, the parameter being sensed in the oxygenatin of blood invasively.
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Citations
19 Claims
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1. A disposable calibration boot for an optical catheter having a distal end and having at least one optical means for emitting light radiation from the distal end and at least one optical means for receiving light radiation at the distal end, said disposable boot comprising:
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a body, a cavity defined in said body to receive the distal end of the optical catheter, said body shielding the distal end of the catheter from ambient light when the distal end is positioned within said cavity; said body having a plurality of isolated compartments, each of said plurality of compartments containing a material having a known reflectivity to return a signal into the receiving optical means upon transmission of a known radiation from the emitting optical means, said body adapted to be positioned on the end of the optical catheter and being movable with respect thereto to position the distal end of the optical catheter adjacent each of said plurality of materials within said body such that the emitting and receiving optical means of the optical catheter selectively interacts individually with each of said plurality of materials to obtain separate backscattered signals from each of said plurality of materials within said calibration boot from light radiation caused to be emitted from the optical means of the optical catheter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical catheter having a disposable calibration boot, said optical catheter having a distal end and having an optical fiber means for emitting light radiation from said distal end and an optical fiber means for receiving light radiation at said distal end, said disposable boot comprising a body secured to said distal end of said optical catheter and having a cavity defined in said body surrounding said distal end of said optical catheter and shielding said distal end from ambient light, a first material contained within said body and having a known reflectivity to reflect a signal into said receiving optical fiber means upon transmission of a known radiation from said emitting optical fiber means, a second material contained within said body and having a different known reflectivity to reflect a second signal into said receiving optical fiber means upon transmission of the known radiation from said the emitting optical fiber means;
- and means to separately and individually position said distal end of said optical catheter to a position adjacent each of said plurality of materials within said calibration boot to cause said emitting and receiving optical means to initially interact with each of said materials to obtain a plurality of calibration signals from said calibration boot.
- View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of providing two point calibration signals from an optical catheter having a distal end, such catheter having an optical means for emitting light radiation to said distal end and a receiving optical means for receiving light radiation at the distal end, said method comprising the steps of:
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fitting a disposable boot comprised of two isolated materials, each having differing properties of reflectivity to light radiation over the end of an optical catheter, positioning the catheter within said disposable boot such that the distal end of the catheter is located adjacent of the two materials, causing light radiation to be emitted from the distal end of the catheter from the emitting optical means into the one of the two materials and detecting a first signal received back into the distal end through the receiving optical means, repositioning the catheter within said disposable boot such that the distal end of the catheter is located adjacent the other of the two materials, causing light radiation to be emitted from the distal end of the catheter from the emitting optical means into the other of the two materials and detecting a second signal received back into the distal end through the receiving optical means, and calibrating the optical catheter and the detecting means based upon the first and second signals. - View Dependent Claims (16, 17, 18, 19)
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Specification