公开(公告)号：US5039492A

公开(公告)日：1991-08-13

申请号：US303584

申请日：1989-01-27

Applicant: Elric W. Saaski ,  David A. McCrae ,  James C. Hartl ,  Dale M. Lawrence ,  Roger A. Wolthuis

Inventor： Elric W. Saaski ,  David A. McCrae ,  James C. Hartl ,  Dale M. Lawrence ,  Roger A. Wolthuis

IPC: G01N21/03 ,  G01N21/31 ,  G01N21/77 ,  G01N21/78 ,  G01N21/80

CPC classification number: G01N21/77 ,  G01N21/783 ,  G01N2021/0314 ,  G01N2021/0385 ,  G01N2021/3144 ,  G01N21/80 ,  G01N2201/0231 ,  G01N2201/062 ,  G01N2201/0621 ,  Y10T436/207497 ,  Y10T436/209163 ,  Y10T436/22

Abstract: An optical pH sensor and a gas sensor utilizing the pH sensor. The pH sensor includes an indicator whose absorbance is a function of the concentration of hydronium ions in a media surrounding the indicator. Light transmitted and reflected through the indicator of the sensor undergoes an absorption that is characteristic of the concentration of the hydrogen ion. The pH sensor can be used as to sense the concenration of a gas in a sample by surrounding the indicator with a liquid or liquid-containing media that changes pH as it is exposed to the gas, and separating the indicator and liquid or liquid-containing media from the gas with a membrane that is permeable to the gas to be measured. A measuring system used with the sensors transmits coherent radiation to the sensor through an optical fiber, separates the radiation returning from the sample into two wavelength bands, and digitally samples the photocurrents produced within the two wavelength bands. A microprocessor performs ratiometric calculations to measure the pH or gas concentration.

Abstract translation: 光学pH传感器和利用pH传感器的气体传感器。 pH传感器包括指示剂，其吸光度是指示剂周围的介质中水合氢离子的浓度的函数。 通过传感器的指示器透射和反射的光经受吸收，其是氢离子浓度的特征。 pH传感器可以用于通过用液体或液体介质围绕指示剂来感测样品中气体的浓缩，所述液体或液体介质在暴露于气体时改变pH，并分离指示剂和液体或液体 来自具有可测量气体的膜的气体的介质。 与传感器一起使用的测量系统通过光纤将相干辐射传输到传感器，将从样品返回的辐射分离成两个波长带，并对在两个波长带内产生的光电流进行数字采样。 微处理器执行比例计算来测量pH或气体浓度。

公开(公告)号：US5275169A

公开(公告)日：1994-01-04

申请号：US822032

申请日：1992-01-15

Applicant: Martin A. Afromowitz ,  Roger A. Wolthuis ,  Gordon L. Mitchell

Inventor： Martin A. Afromowitz ,  Roger A. Wolthuis ,  Gordon L. Mitchell

IPC: A61B5/0215 ,  A61M29/00

CPC classification number: A61B5/0215

Abstract: A system includes a catheter (10) having a low pressure balloon (42) at of one end thereof, a precise, low pressure, low volume fluid infusion means (41) and a pressure sensor (43). The balloon (42) is introduced to a body lumen, such as a blood vessel, and inflated to a pressure at or just above physiologic, typically being below 200 mmhg. From the balloon volume at a particular pressure, the internal cross-sectional area and diameter of the vessel can be calculated. Additional calculations can be made at other pressures below 200 mmhg to determine compliance of the vessel.

Abstract translation: 一种系统包括在其一端具有低压球囊（42）的导管（10），精确的低压低体积流体输注装置（41）和压力传感器（43）。 将球囊（42）引入体腔，例如血管，并膨胀至生理上或正好高于生理的压力，通常低于200mmhg。 从特定压力下的气囊体积可以计算容器的内部横截面面积和直径。 可以在低于200mmhg的其他压力下进行额外的计算，以确定容器的顺应性。