Blood vessel catheter and injection system for carrying out a blood pressure measurement of a patient

Abstract

An injection system for injecting an injectate fluid into a blood vessel of the patient and for carrying out a blood pressure measurement of a patient. The injection system includes a catheter tube having a first end for penetrating the blood vessel of the patient, and a pressure sensor which is arranged close to a second end of the catheter tube and can sense a pressure of a liquid in the catheter tube as an indication of the blood pressure of the patient.

Description

[0001] This claims priority to German application DE 10 2005 060 079.4, filed Dec. 15, 2005, the entire disclosure of which is incorporated by reference herein. [0002] The present invention relates to blood vessel catheter located proximate to a patient's body for measuring blood pressure, drawing blood samples or injecting fluids into a blood vessel of the patient. The present invention further relates to a system for drawing blood samples or injecting fluids into the blood vessel of the patient and for carrying out a blood pressure measurement of a patient. BACKGROUND [0003] Measurement systems for measuring blood pressure of a patient's body are well known in clinical appliances. They usually comprise a rinsing fluid reservoir which is connected using a fluid flow tube to a catheter tube, which in use penetrates a patient's body such that the rinsing fluid is supplied as a continuous rinsing fluid stream. Along the rinsing channel one or more valves can be arranged to manually st...

AI Technical Summary

Benefits of technology

[0007] An object of the present invention is to provide a blood vessel catheter and a fluid transfer system which avoids the drawbacks of the prior art and allows for an accurate and continuous measurement of the blood pressure of the patient.

[0010] The catheter has an advantage that the pressure sensor for sensing the blood pressure of the patient is located close to the blood vessel of the patient such that a damping or a resonance of the detected pressure is reduced or eliminated. Furthermore, the pressure sensor is located outside of the patient's body such that a zeroing of the pressure sensor can be carried out even if the catheter is in use.

[0016] The present invention may further provide a shut-off valve arranged upstream to the pressure sensor which is adapted to be manually operated for controlling a liquid flow through the catheter tube. This allows an instant manual control of the fluid flow into the patient's body. For this valve also a 3 way stop cock could be used. This can allow convenient application of a guide wire to the catheter e.g. for a Seldinger catheter placement technique.

[0018] The fluid transfer system according to present invention allows a continuous measurement of a blood pressure of a patient while the blood pressure is sensed close to the patient's body. A damping or a resonance of the pressure signal thus advantageously can be avoided.

Problems solved by technology

The disadvantage of this system is that the pressure signal is falsified by the transfer characteristic of the long transfer tube system due to damping or resonance as a result of the length of the transfer tube.

Although such an arrangement provides a very good signal transmission it is very expensive and a larger diameter of the catheter tube is needed.

Furthermore, controlling and adjusting the zero point pressure of the tip manometer is no longer possible after the catheter tube is placed inside the patient's body.

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