EP-4734838-A1 - AN INVASIVE BLOOD PRESSURE MONITORING SYSTEM

Abstract

An invasive blood pressure monitoring system has a blood pressure transducer, a stopcock for venting a blood pressure transducer, and a display for displaying the monitored blood pressure. A controller determines if the stopcock is open or closed and provides or updates the displayed information when the stopcock is detected as open.

Inventors

• WALDEN, ANDREAS
• BRENKER, Sonja

Assignees

• Koninklijke Philips N.V.

Dates

Publication Date

20260506

Application Date

20240619

Claims (15)

1. 1. An invasive blood pressure monitoring system (10), comprising: a catheter-based blood pressure transducer (12,14); a stopcock (16) for venting the blood pressure transducer; a display (20) for displaying the monitored blood pressure; and a controller (18) for controlling the display, wherein the controller (18) is configured to: determine if the stopcock is open or closed; control the display to display a trace (30) of the sensed blood pressure and to display information (34) relating to a zeroing function, wherein the information relating to a zeroing function is provided or updated when the stopcock is detected as open.
2. 2. The system of claim 1, wherein the controller is configured to determine if the blood pressure transducer is connected, and to control the display to display information relating to the zeroing function, wherein the information relating to the zeroing function is provided or updated when the blood pressure transducer is detected as connected.
3. 3. The system of claims 1 or 2, wherein the stopcock (16) is for venting the blood pressure transducer (14) to the ambient surroundings.
4. 4. The system of claims 1 or 2, wherein the blood pressure transducer (14) comprises a zeroing line, and the stopcock (16) is for venting the blood pressure transducer to the zeroing line.
5. 5. The system of any one of claims 1 to 4, wherein the controller is configured to detect the stopcock is open based on the pressure sensed by the blood pressure transducer.
6. 6. The system of any one of claims 1 to 5, wherein the controller is configured to: display an icon (34), for actuation by a user to implement the zeroing function, adjacent or within the displayed blood pressure trace when the stopcock is detected as open; and remove the icon (34) when the stopcock is detected as closed.
7. 7. The system of any one of claims 1 to 5, wherein the controller is configured to: trigger an automatic zeroing procedure after a predetermined time interval following detection of the stopcock being open.
8. 8. The system of any one of claims 1 to 5, further comprising an actuator (112) for actuating the stopcock, wherein the controller is configured to determine when a zeroing function is appropriate and to implement the zeroing function automatically when appropriate; and optionally, wherein the stopcock comprises a sensor (114) for sensing the stopcock position.
9. 9. The system of claim 8, wherein the controller is configured to determine that the zeroing function is not appropriate based on factors including one or more of: the patient's status is critical; there is noise above a threshold in the pressure sensed by the catheter blood pressure transducer; the hemodynamic condition of the patient is unstable; during a flushing procedure; and the pressure transducer is not at the correct level.
10. 10. The system of claim 8 or 9, wherein the controller is configured to control the display to provide a countdown to the automatic zeroing function and provide an icon to allow cancellation of the automatic zeroing function.
11. 11. A computer program comprising computer program code which is adapted, when said program is run on a controller of the blood pressure monitoring system of any one of claims 1 to 10, to perform a method comprising: receive a determination of whether the stopcock is open or closed; controlling the display to display a trace (30) of the sensed blood pressure and to display information (34) relating to a zeroing function, wherein the method comprises providing or updating the information relating to a zeroing function when the stopcock is determined to be open.
12. 12. The computer program of claim 11, wherein the method further comprises: receive a determination of whether the blood pressure transducer is connected, and providing or updating the information relating to the zeroing function when the blood pressure transducer is determined to be connected.
13. 13. The computer program of claims 11 or 12, wherein the method further comprises: controlling the display to display an icon (34), for actuation by a user to implement the zeroing function, adjacent or within the displayed blood pressure trace when the stopcock is detected as open; and removing the icon (34) when the stopcock is detected as closed.
14. 14. The computer program of claims 11 or 12, wherein the method further comprises: triggering an automatic zeroing procedure after a predetermined time interval following detection of the stopcock being open.
15. 15. The computer program of claims 11 or 12, wherein the method further comprises: determining when a zeroing function is appropriate and implementing a zeroing function automatically when appropriate.

Description

AN INVASIVE BLOOD PRESSURE MONITORING SYSTEM FIELD OF THE INVENTION This invention relates to invasive blood pressure monitoring systems, namely blood monitoring using a catheter inserted into the vasculature of a subject. BACKGROUND OF THE INVENTION Invasive blood pressure monitoring is a commonly used method in critical care settings to measure patients' arterial blood pressure continuously. It is used in patients who require close monitoring, such as those with critical illnesses, severe injuries, or during surgical procedures. The method involves the insertion of a catheter into an artery, which is then connected to a transducer that converts the arterial pressure into an electrical signal. This signal is then displayed on a monitor and recorded for clinical use. The accuracy of invasive blood pressure monitoring is critical for patient safety and proper clinical management. However, inaccurate measurements can occur due to several factors, including improper system zeroing. Zeroing the invasive blood pressure system ensures that the transducer is calibrated to atmospheric pressure, which is necessary to obtain accurate measurements. The zeroing process involves several steps, including flushing the catheter to remove any air bubbles, ensuring that the transducer is at the same level as the phlebostatic axis (the point that corresponds to the right atrium), and opening a stopcock (which vents the pressure transducer to the atmosphere) to allow the transducer to equilibrate with atmospheric pressure. The zeroing process means the recorded blood pressure traces a zero line when the stopcock is open. After the zeroing process, the clinician can verify the accuracy of the measurement by comparing it to non-invasive blood pressure readings or by performing a square wave test. The zeroing process is a critical task that requires proper training and adherence to established protocols. It is essential to minimize the risk of complications, such as infection, bleeding, and arterial damage, resulting from improper zeroing. In addition, it is essential to ensure that the equipment is properly maintained and calibrated to ensure accurate and safe measurements. The zeroing process includes manual tasks, which take time away from the caregiver and can lead to errors, e.g., medical use errors. The zeroing process requires proper training and concentration during the actual zeroing performance. In today's hospitals, caregivers are stressed because of the high workload, many tasks, and even more documentation. These circumstances can lead to delayed interventions like zeroing or errors during the procedure, leading to inaccurate invasive pressure readings. Additionally, the user interface of current patient monitors does not facilitate the zeroing procedure most efficiently. There is a need to improve the task of zeroing an invasive blood pressure measurement. SUMMARY OF THE INVENTION The invention is defined by the claims. According to examples in accordance with an aspect of the invention, there is provided an invasive blood pressure monitoring system, comprising: a catheter-based blood pressure transducer; a stopcock for venting the blood pressure transducer; a display for displaying the monitored blood pressure; and a controller for controlling the display, wherein the controller is configured to: determine if the stopcock is open or closed; control the display to display a trace of the sensed blood pressure and to display information relating to a zeroing function, wherein the information relating to a zeroing function is provided or updated when the stopcock is detected as open. The zeroing function of an invasive blood pressure system ensures that the transducer is calibrated to atmospheric pressure, which is necessary to obtain accurate measurements. The need to offer a zeroing function complicates the displayed information to the user. The system of the invention determines when the stopcock is open, in preparation for a zeroing procedure, and then adapts the display accordingly. In this way, the display does not need to be cluttered with information about the zeroing procedure before it is to be implemented. The user interface may also include a speaker for providing audio feedback, such as voice feedback, and it may also include a microphone for receiving voice prompts to zero the invasive pressure line. Additionally, or alternatively the user interface may include a gesture sensor, e.g., hand gesture recognition sensor for receiving gesture prompts to zero the invasive pressure line. Additionally, or alternatively the user interface may include an eye tracking sensor, for receiving prompts to zero the invasive pressure line, e.g., virtual reality and/or augmented reality glasses comprising eye tracking sensing technology. The catheter-based blood pressure transducer may have a zeroing line or it may not have a zeroing line. When there is no zeroing line, the stopcock is used to equilibrate the pressure tra