APD Damping Chamber Layout for Accurate Pressure Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pressure pulsations induced by pumps in automated peritoneal dialysis systems cause challenges in capturing accurate pressure readings and can lead to patient discomfort, particularly in small-pressure ranges.
Innovation Solution
Damping devices with a single chamber defined by cavities and membranes that absorb pressure pulsations, positioned in a vertical orientation to facilitate air removal, reducing pulsation amplitudes and improving pressure measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If pumps are used to introduce and remove solution in automated peritoneal dialysis systems, then solution exchange can be automated, but pressure pulsations are induced that cause inaccurate pressure readings and patient discomfort
Solution Approach 1:
A damping device is introduced as an intermediary component between the pump and the patient's abdomen. This device includes a compliance chamber that absorbs pressure pulsations generated by the pump, preventing them from being transmitted to the patient while allowing automated solution exchange to continue. The damping device acts as a mediator that decouples the pump's pulsating output from the sensitive pressure measurement and patient interface.
Solution Approach 2:
The harmful pressure pulsations are extracted and isolated from the main fluid flow path by routing them into a separate compliance chamber. The chamber captures and absorbs these pulsations, removing them from the line that connects to the patient. This extraction separates the useful automated pumping function from the harmful pulsation effect.
2Extent of automation
If pumps are used to introduce and remove solution in automated peritoneal dialysis systems, then solution exchange can be automated, but patient discomfort occurs due to pressure pulsations
Solution Approach 1:
The damping device serves as a protective intermediary between the automated pump system and the patient. It absorbs and dampens pressure pulsations before they reach the patient's abdomen, eliminating the harmful effect while preserving the beneficial automated exchange function.
Solution Approach 2:
The compliance chamber is designed to cushion pressure pulsations before they can affect the patient. By providing this damping capacity in advance within the fluid path, the system prevents discomfort from occurring rather than correcting it after the fact.
3Measurement precision
If damping devices with multiple chambers are used to reduce pressure pulsations, then pressure measurement accuracy improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The damping device is designed to perform multiple functions within a single integrated structure: it dampens pressure pulsations, provides a pathway for air removal, and maintains accurate pressure readings. By combining these functions in one device rather than using separate components, the patent reduces overall system complexity while achieving the desired pressure measurement accuracy.
Solution Approach 2:
The damping device merges the pressure damping function with the air venting function into a single integrated component. The compliance chamber serves both to absorb pressure pulsations and to provide a pathway for trapped air to escape, eliminating the need for separate air venting mechanisms and reducing device complexity.
4Reliability
If damping devices are integrated into disposable sets for automated peritoneal dialysis, then pressure pulsation reduction is achieved, but manufacturing cost increases
Solution Approach 1:
The damping device utilizes the compressibility parameter of trapped air within the compliance chamber to achieve pressure pulsation reduction. By leveraging this inherent physical property rather than requiring active control mechanisms or expensive materials, the device achieves reliable pressure control through passive, cost-effective design.
Solution Approach 2:
The damping device is designed specifically for integration into disposable single-use sets. By optimizing the design for disposable application, the patent avoids the need for expensive, durable materials required for reusable devices. The simple compliance chamber structure can be manufactured cost-effectively as a single-use component, achieving reliable pressure control without compromising on manufacturing economics.
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 damping devices effectively reduce pressure pulsation amplitudes, enhance pressure reading accuracy, minimize patient discomfort, and decrease the risk of air introduction, while being cost-effective and suitable for disposable sets.
Implementation Method 1
a first portion of the first membrane or a first portion of the second membrane is configured to expand outwards away from or contract inwards towards a center of the cavity to increase or decrease, respectively, a volume of a chamber
Implementation Method 2
the damping device can be positioned in a vertical orientation during operation to facilitate removal of air from fluid lines operably connected to the patient
Data Source
AI summary
Damping devices, including damping devices for automated peritoneal dialysis (APD) systems, and associated systems, devices, and methods are disclosed herein. In one embodiment, a damping device includes a body portion, a first membrane, and a second membrane. The body portion can include a first side, a second side opposite the first side, an inlet, and a cavity fluidly coupled to the inlet. The cavity can be defined at least in part by a lumen in the body portion extending from the first side to the second side. The first membrane can be affixed to the first side of the body portion such that the first membrane hermetically seals the cavity at the first side. The second membrane can be affixed to the second side of the body portion such that the second membrane hermetically seals the cavity at the second side.