Method and heart support system for determining an outlet pressure

Patent metadata

Field	Value
Publication number	US-2017128646-A1
Application number	US-201515322696-A
Country	US
Kind code	A1
Filing date	Jul 1, 2015
Priority date	Jul 3, 2014
Publication date	May 11, 2017
Grant date	—

Abstract

Methods and systems are provided for determining an outlet pressure prevailing at an outlet of a heart assist system. An inlet pressure which prevails at an inlet of the heart assist system may be determined. A pressure difference between the inlet and the outlet of the heart assist system may be determined. The outlet pressure may be determined from the inlet pressure and the pressure difference.

First claim

1 . A method for determining an outlet pressure prevailing at an outlet of a heart assist system, wherein the method comprises the following steps:
determining an inlet pressure which prevails at the inlet of the heart assist system; estimating a pressure difference between the inlet and the outlet of the heart assist system; determining the outlet pressure from the inlet pressure and the pressure difference.

2 . The method according to claim 1 , wherein the heart assist system comprises a pump and a cannula inlet of a cannula which is connected to a pump outlet, a pump inlet is the inlet of the heart assist system and a cannula outlet is the outlet of the heart assist system, the pressure difference is formed from a pump pressure difference between the pump inlet and the pump outlet and from a cannula pressure difference between the cannula inlet and the cannula outlet, and the pump pressure difference or a variable which is proportional to the pump pressure difference is measured, and the cannula pressure difference is estimated.

3 . The method according to claim 2 , wherein the cannula pressure difference is estimated by way of a variable which is detected by the pump.

4 . The method according to claim 1 , wherein a model of the pressure difference is determined and at least one parameter of the model is determined by way of statistical methods.

5 . The method according to claim 1 , wherein the pressure difference is estimated by way of a higher order polynomial and wherein the polynomial is preferably a function of a variable which is measurable by the heart assist system.

6 . A heart assist system with a pump, for the assistance of the heart and with a cannula which is connectable to the pump, wherein the pump comprises a pump inlet and a pump outlet, and the cannula comprises a cannula inlet and a cannula outlet, and the heart assist system comprises a pressure detection system which is configurable in a manner such that a pressure prevailing at the pump inlet is detectable and that a pump pressure difference between the pump inlet and the pump outlet is detectable, and wherein a control unit is present, which is configured in a manner such that a cannula pressure difference between the cannula inlet and the cannula outlet can be estimated.

7 . The heart assist system according to claim 6 , wherein the control unit comprises a microprocessor, a microcontroller, a programmable field array or an external control unit.

8 . The heart assist system according to claim 6 , wherein the control unit comprises a memory unit, and the memory unit stores commands and/or parameters for estimating the cannula pressure difference.

9 . The heart assist system according to claim 6 , wherein the control unit is connected to the pressure detection system so that data detected by the pressure detection system can be transferred to the control unit.

10 . The heart assist system according to claim 6 , wherein a volume flow sensor is moreover present.

11 . The heart assist system according to claim 6 , wherein the control unit is designed in a manner such that at least one variable detected by the pump is used for estimating the cannula pressure difference.

12 . The heart assist system according to claim 11 , wherein the control unit is designed in a manner such that the cannula pressure difference is determined in dependence on a volume flow flowing through the pump.

13 . The heart assist system according to claim 12 , wherein the control unit is designed in a manner such that the volume flow is determined by way of the pump pressure difference, wherein the pump pressure difference is preferably determined by way of a displacement of a pump rotor.

14 . The heart assist system according to claim 6 , wherein the pressure detection system comprises a pressure sensor at the pump inlet and/or a pressure sensor at the pump outlet and/or a differential pressure sensor in the pump.

15 . A method for determining an aortic pressure of an aorta, which comprises the following steps:
determining a ventricle pressure of a left ventricle; estimating a pressure difference along a bypass running between the ventricle and the aorta; determining the aortic pressure from the ventricle pressure and from the pressure difference.

Assignees

• Berlin Heart Gmbh

Inventors

• Karch Dominik

Classifications

• A61M2205/3344

  Measuring or controlling pressure at the body treatment site · CPC title

• A61M2205/3334

  Measuring or controlling the flow rate · CPC title

• A61M2205/3523

  using telemetric means · CPC title

• A61M2205/3365

  Rotational speed · CPC title

• A61M2205/52

  with memories providing a history of measured variating parameters of apparatus or patient · CPC title