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Interface unit and a measurement system

  • US 9,592,009 B2
  • Filed: 02/24/2012
  • Issued: 03/14/2017
  • Est. Priority Date: 11/12/2010
  • Status: Active Grant
First Claim
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1. An extracorporeale interface unit, for an intravascular measurement system for measuring at least one physiological, or other, variable in a living body, adapted to generate a sensor signal in response to said variable, which interface unit comprises:

  • a sensor interface circuitry adapted to interface a sensor wire configured to be inserted into the living body and provided with one or more sensor elements at its distal region, the sensor interface circuitry being configured to generate measured data of said variable as a sensor signal;

    a controller configured to control and supervise functions of the interface unit, wherein the functions are performed by predefined tasks (T1, T2, . . . , Tn) during consecutive control periods having the same time duration tcp, and that during each task (T1, T2, . . . , Tn) a predefined function of the interface unit is performed,wherein each predefined task (T1, T2, . . . , Tn) has a designated task time period length (t1, t2, t3, . . . , tn), and only one task (T1, T2, . . . , Tn) is adapted to be executed at the same time and each task (T1, T2, . . . , Tn) in a control period has a designated task time slot within said control period, wherein the tasks (T1, T2, . . . , Tn) within a control period are separated by a specified task separation time period ts andwherein said sensor interface circuitry comprises two distinct current source units (CSU1, CSU2) adapted to energize said one or more sensor elements via at least two connection points (CP1, CP2, . . . , CPn), and a switching unit, wherein said switching unit is adapted to alternately switch connection between said current source units (CSU1, CSU2) and at least two of said connection points (CP1, CP2, . . . , CPn) from one control period to a subsequent control period, and wherein each connection is maintained during one of said predefined tasks (T1, T2, . . . , Tn), having a task time period length (t1, t2, t3, . . . , tn).

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