Catheter Pressure Sensor Placement for Signal Accuracy
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Solution Overview
Problem
Existing blood pressure measurement systems suffer from signal damping and resonance due to long transfer tubes, and tip manometers are expensive with impractical zero-point pressure adjustment after catheter placement.
Innovation Solution
A blood vessel catheter with a pressure sensor located outside the patient, connected to a catheter tube, allowing for accurate and continuous blood pressure measurement with a control valve and fluid transfer system for injecting or sampling, enabling remote operation and zeroing of the pressure sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a long transfer tube is used to connect the pressure sensor to the patient, then the pressure signal can be transmitted over distance, but signal damping and resonance occur due to the length of the transfer tube
Solution Approach 1:
The system is divided into two separate parts: a disposable catheter unit with the pressure sensor located at the patient's side, and a reusable organizer plate with electronics. This segmentation allows the sensor to be positioned close to the measurement point while keeping the signal processing equipment at a convenient location, eliminating the need for long transfer tubes that cause signal damping and resonance.
2Measurement precision
If a tip manometer is used for pressure measurement, then very good signal transmission is achieved, but the catheter tube diameter must be larger and zero-point pressure adjustment is no longer possible after catheter placement
Solution Approach 1:
The pressure sensor is integrated into the catheter tip and positioned to measure pressure directly at the measurement point. The zero-point calibration is performed before catheter insertion using the organizer plate interface, ensuring accurate baseline measurement. This preliminary calibration eliminates the need for post-insertion adjustment while maintaining excellent signal transmission.
3Measurement precision
If the pressure sensor is located inside the patient's body at the catheter tip, then accurate blood pressure measurement is achieved, but zeroing of the pressure sensor cannot be carried out after catheter placement
Solution Approach 1:
The pressure sensor is extracted from the traditional location inside the patient's body at the catheter tip and relocated to the disposable catheter unit that remains outside the patient's body. This extraction allows the sensor to be zeroed and calibrated on the organizer plate before use, while still being positioned close enough to the patient for accurate measurement. The sensor measures pressure through the catheter lumen without requiring internal placement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces signal damping and resonance, allows for continuous and accurate blood pressure measurement, and facilitates easy zeroing of the pressure sensor, while being cost-effective and practical for clinical use.
Implementation Method 1
a pressure sensor which is arranged at a second end of the catheter tube outside of the patient, wherein the pressure sensor is adapted to sense a pressure of the liquid in the catheter tube as an indication of the blood pressure of a patient
Implementation Method 2
The pressure sensor on this organizer plate is then connected to the patient via a long tube which is filled with liquid. Thus, the pressure signal is hydraulically transmitted via the transfer tube.
Data Source
AI summary
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.