Exhalation Valve Bypass Chamber for Accurate Upstream Pressure Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhalation valve arrangements in ventilation apparatuses face challenges in accurately detecting respiratory gas pressure upstream from the valve subassembly due to design limitations, making it difficult to maintain precise positive end-expiratory pressure (PEEP) and monitor gas flow effectively.
Innovation Solution
An exhalation valve arrangement with a bypass chamber that allows for the attachment of a gas pressure sensor, providing accessible measurement of upstream respiratory gas pressure, which is otherwise concealed, and featuring a puncturable closure membrane for quick setup and secure attachment of the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the upstream respiratory gas conduit is concealed within the valve subassembly design, then the structural compactness is improved, but the accessibility for pressure sensor attachment deteriorates
Solution Approach 1:
The bypass chamber is nested within the downstream respiratory gas conduit, creating a compact structure where the sensor attachment opening is accessible from the exterior while the chamber itself remains integrated within the existing conduit structure. This resolves the contradiction by providing sensor accessibility without compromising structural compactness.
2Ease of operation
If a puncturable closure membrane is added to the sensor attachment opening, then the ease of setup is improved, but the device complexity increases
Solution Approach 1:
The closure membrane is pre-installed and puncturable to allow quick sensor attachment during setup. This preliminary preparation enables fast installation without requiring complex assembly procedures, resolving the contradiction by simplifying setup while adding only minimal structural elements.
Solution Approach 2:
A thin, puncturable closure membrane is used to seal the sensor attachment opening. This flexible film provides an simple yet effective solution for maintaining sterility and enabling quick sensor access, adding minimal complexity while significantly improving ease of setup.
3Loss of substance
If the bypass chamber is integrated into the downstream respiratory gas conduit, then the loss of gas flow path is minimized, but the measurement accessibility is improved
Solution Approach 1:
The bypass chamber is nested within the downstream respiratory gas conduit, allowing the chamber to access upstream pressure through the valve subassembly while the sensor attachment opening on the exterior provides easy measurement access. This nesting approach minimizes disruption to the main gas flow path while enabling convenient pressure detection.
Solution Approach 2:
The bypass chamber acts as an intermediary, allowing pressure measurement without requiring direct access to the upstream respiratory gas conduit. It mediates between the concealed upstream pressure and the accessible downstream conduit exterior, enabling accurate pressure detection while maintaining flow path efficiency.
Data Source
AI summary
An exhalation valve arrangement (22) for a ventilation apparatus for artificial ventilation of patients is flow-capable in an exhalation flow direction (E) and encompasses:an upstream respiratory gas conduit (54) that extends along a first conduit path (K1) and is connected or connectable to a portion, coming from the patient, of the exhalation line;a downstream respiratory gas conduit (58) that extends along a second conduit path (K2) and is connected or connectable to a respiratory gas sink (U);a valve subassembly (63) which comprises a valve body (64) and a valve seat (66) and which is provided between the upstream and the downstream respiratory gas conduit (54, 58) in such a way that, in the context of a predetermined first respiratory gas overpressure in the upstream respiratory gas conduit (54) relative to the downstream respiratory gas conduit (58), it permits an expiratory respiratory gas flow from the upstream respiratory gas conduit (54) into the downstream respiratory gas conduit (58); and in the context of a predetermined second respiratory gas overpressure in the downstream respiratory gas conduit (58) relative to the upstream respiratory gas conduit (54), it blocks a gas flow from the downstream respiratory gas conduit (58) into the upstream respiratory gas conduit (54).Provision is made according to the present invention that the exhalation valve arrangement (22) comprises a bypass chamber (74) which communicates in terms of flow mechanics with the upstream respiratory gas conduit (54) and which extends, proceeding from the upstream respiratory gas conduit (54), into the region of the downstream respiratory gas conduit (58) and is embodied there for attachment of a gas pressure sensor (80).