Process and device for determining the pulse transit time and extracorporeal hemotherapeutic arrangement with such a device
First Claim
1. A process for determining the pulse transit time of a patient or donor, in which a pulse transit time is measured for pulse waves, propagating via the patient'"'"'s or donor'"'"'s vascular system and created by his/her heart contractions, comprising:
- determining a value, correlating with a blood density; and
using the value, correlating with the blood density, to calculate, from the pulse transit time measured, a pulse transit time for which an influence of the blood density is compensated.
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Accused Products
Abstract
A process and a device for improving the determination of the pulse transit time for non-invasive blood pressure measurement. A value, correlating with the blood density, is determined and its influence on the pulse transit time is compensated. In this manner more precise blood pressure data can be obtained. In a further development, a value, correlating with the blood density, is determined by a measuring device for the change in relative blood volume or hematocrit. The device can also be used as part of a hemotherapeutic arrangement such as a hemodialysis device and/or hemofiltration device, in which a blood pressure monitoring as continuous and precise as possible is desired, among other things, because of a blood volume change and thereby a blood density change inherent in the therapy.
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Citations
30 Claims
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1. A process for determining the pulse transit time of a patient or donor, in which a pulse transit time is measured for pulse waves, propagating via the patient'"'"'s or donor'"'"'s vascular system and created by his/her heart contractions, comprising:
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determining a value, correlating with a blood density; and
using the value, correlating with the blood density, to calculate, from the pulse transit time measured, a pulse transit time for which an influence of the blood density is compensated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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7. The process, according to claim 6, wherein the relation of the blood densities is determined by the expression
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8. The process, according to claim 6, wherein the relation between the blood densities is expressed by the expression
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9. A device for determining a patient'"'"'s or donor'"'"'s pulse transit time comprising:
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means for determining the pulse transit time of pulse waves, which are propagated via the patient'"'"'s or donor'"'"'s vascular system and are created by heart contractions;
means for determining a value, correlating with blood density; and
an evaluation unit compensating for an influence of the blood density on the pulse transit time. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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20. The device, according to claim 19, wherein the relation between the blood densities is represented by the expression
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21. The device, according to claim 19, wherein the relation between the blood densities is represented by the expression
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22. The device, according to claim 9, wherein the device further includes an alarm and the evaluation unit is suitable for recognizing abnormal values of the pulse transit time by means of stored criteria and then setting on the alarm.
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23. The device, according to claim 9, wherein the means for determining the pulse transit time comprise the means for determining a value, correlating with the blood density.
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24. A hemotherapeutic arrangement with an extracorporeal blood circulation, comprising:
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a hemotherapeutic filter arrangement;
a blood supply line for connection to a patient or donor, said supply line being connected at one end to an intake of the hemotherapeutic filter arrangement and connectable at the other end to the patient'"'"'s or donor'"'"'s vascular system;
a blood removal line for connection to the patient or donor, said removal line being connected at one end to an outlet of the hemotherapeutic filter arrangement and connectable at the other end to the patient'"'"'s or donor'"'"'s vascular system; and
a device for determining the patient'"'"'s or donor'"'"'s pulse transit time including, means for determining the pulse transit time of pulse waves, which are propagated via the patient'"'"'s or donor'"'"'s vascular system and are created by heart contractions;
means for determining a value, correlating with blood density; and
an evaluation unit compensating for an influence of the blood density on the pulse transit time. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification