Intraperitoneal pressure ("IPP") measurement methods, apparatuses, and systems
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Solution Overview
Problem
Current methods for measuring intraperitoneal pressure (IPP) in peritoneal dialysis are inaccurate due to low sensitivity of pressure sensors, movement artifacts, and variations caused by patient factors such as food consumption and body position, leading to suboptimal fill volume parameters.
Innovation Solution
The use of a pressure amplifier with a pressure sensor integrated into the transfer set or catheter, combined with a force sensor and spirometer, to enhance pressure measurement accuracy and account for patient movement, along with a processor to adjust measurements based on patient-specific data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is used to measure intraperitoneal pressure in peritoneal dialysis, then pressure measurement is enabled, but the measurement precision is insufficient due to low sensitivity
Solution Approach 1:
A pressure amplifier is introduced as an intermediary device between the pressure sensor and the peritoneal cavity. The amplifier has a large surface area on the peritoneal cavity side and a small surface area on the sensor side, creating mechanical leverage that amplifies the pressure signal. This allows the pressure sensor to detect low pressure changes in the peritoneal cavity with sufficient precision, resolving the contradiction between enabling pressure measurement and achieving measurement precision.
2Ease of operation
If manual peritoneal dialysis is performed, then treatment can be administered, but it requires significant time and effort from the patient
Solution Approach 1:
The system enables automated peritoneal dialysis by integrating the pressure amplifier and sensor with an automated dialysis machine. The machine automatically monitors intraperitoneal pressure, calculates optimal fill volumes, and controls the dialysis fluid exchange process without requiring manual patient intervention. This transforms the manual self-service process into an automated system that reduces patient effort and time loss while maintaining treatment effectiveness.
3Productivity
If fill volume parameter is increased to improve treatment effectiveness, then more waste removal is achieved, but patient discomfort increases due to overfilling
Solution Approach 1:
The system continuously monitors intraperitoneal pressure during the fill phase using the pressure amplifier and sensor. The pressure data is fed back to the control system, which automatically adjusts the fill volume to maintain pressure within a comfortable range while maximizing waste removal. This closed-loop feedback control resolves the contradiction by dynamically optimizing fill volume based on real-time pressure measurements, preventing overfilling discomfort while maintaining treatment effectiveness.
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
Provides more accurate IPP measurements and fill volume parameters, reducing patient discomfort and treatment inefficiencies by ensuring precise fluid delivery in peritoneal dialysis.
Implementation Method 1
Pressure imparted on the first side of the amplifier by PD fluid located within the transfer set or catheter is increased in magnitude based on Pascal's law to impart a proportionally greater force on the pressure sensor element
Implementation Method 2
a pressure sensor configured to contact the transfer set or catheter. The pressure sensor is configured to transmit output data indicative of an IPP within the patient's peritoneal cavity. The pressure sensor includes a pressure element configured to measure a pressure imparted by a fluid within the transfer set or catheter
Implementation Method 3
The force sensor provides an indication of patient movement and/or pressure sensor movement during an IPP measurement
Implementation Method 4
use a spirometer to measure a patient's lung capacity to determine a fill volume parameter
Data Source
AI summary
An intraperitoneal pressure (“IPP”) measurement apparatus is disclosed herein. In an example, the IPP measurement apparatus includes a transfer set and s catheter that are fluidly coupled to a patient's peritoneal cavity and a spirometer for transmitting output data indicative of a volume of air inspired and expired by a patient's lungs. The IPP measurement apparatus also includes a processor configured to record the output data from the spirometer during dwell intervals between when PD fluid is provided to and removed from the patient's peritoneal cavity. The processor is also configured to use a correlation between lung capacity and IPP to determine at least one of IPP or a fill volume parameter based on at least the output data from the spirometer.