Patent ID: 11963743
Assignee: COROVENTIS RESEARCH AB
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 16:
17. A system for determining microvascular resistance reserve, MRR, in the myocardium perfused by a normal or a stenotic coronary artery of a human patient, comprising:
a processing unit;
a first flow measuring system configured for measuring the blood flow, Qrest, through the coronary artery during rest condition of the patient;
a first pressure measuring instrument configured for measuring the blood pressure, Pa, at a position proximal in the coronary artery or proximally of any stenosis, if present, during rest condition or during maximum hyperemia of the patient;
a second flow measuring system configured for measuring the blood flow, Qmax, through the coronary artery during maximum hyperemia of the patient; and
a second pressure measuring instrument configured for measuring the blood pressure, Pd,hyper, at a position distal in the coronary artery or distally of any stenosis, if present, during maximum hyperemia of the patient,, wherein the processing unit is configured for obtaining blood flow measurements Qrest, Qmax from the first and second flow measuring systems and obtaining blood pressure measurements Pa, Pd, hyper from the first and second pressure measuring instruments, and wherein the processing unit is further configured for calculating the microvascular resistance reserve as, M
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     Q
     rest
    
   
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    .