Adjustable CPR Piston Structure for Variable Patient Size
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Solution Overview
Problem
Mechanical CPR devices lack adjustability to accommodate patients of varying sizes, leading to potential injuries and inconsistent compression quality.
Innovation Solution
Incorporation of an extendable piston mechanism with sensors and adjustable features, such as removable spacers or rotatable bayonet sleeves, to adapt the length of the piston for different patient sizes, ensuring consistent and safe mechanical CPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-length piston is used in mechanical CPR devices, then the device structure is simple, but the device cannot accommodate patients of varying sizes
Solution Approach 1:
The piston is divided into multiple segments including a first piston portion, a second piston portion, and an intermediate portion. These segments can be independently adjusted or configured to achieve different overall lengths, allowing the device to adapt to patients of varying sizes while maintaining a relatively simple overall structure.
Solution Approach 2:
The piston design allows for dynamic adjustment of its length through the intermediate portion that can be positioned at different locations along the piston's length. This dynamic configurability enables the same piston structure to serve multiple patient size requirements without requiring completely different pistons for each patient type.
2Adaptability or versatility
If the piston length is extended to reach smaller sternums, then the device can accommodate smaller patients, but the risk of injury increases due to excessive compression depth
Solution Approach 1:
The device incorporates sensors that detect the actual compression depth and piston position in real-time. This feedback mechanism allows the control system to monitor whether the compression depth is within safe limits and to adjust the piston movement accordingly, preventing excessive compression that could cause injury while still enabling accommodation of smaller patients through appropriate piston length configuration.
Solution Approach 2:
The system dynamically adjusts compression parameters including piston speed, force, and depth based on detected patient characteristics and piston configuration. By changing these parameters in real-time, the device can safely accommodate smaller patients with extended piston lengths while preventing injury through controlled compression depth and force.
3Reliability
If manual CPR is performed, then the operator can adjust compression depth and rate, but the operator experiences fatigue and cannot maintain consistent compressions over time
Solution Approach 1:
The mechanical CPR device performs the physically demanding task of chest compressions autonomously once configured with the appropriate piston length. The motorized piston system maintains consistent compression depth and rate without operator fatigue, while the adjustable piston design allows the device to self-adapt to different patient sizes through sensor feedback and automated parameter adjustment.
Data Source
AI summary
Techniques and devices for extending a piston and/or compression unit, for example connected to a medical device such as a mechanical CPR device, to accommodate different sized patients, are described herein. In some cases, a piston of a mechanical CPR device may include an inner piston at least partially slidable into an external piston sleeve. In one aspect, some aspects, the piston includes sleeves which can move relative to each other to extend the piston. In additional aspects, the compression mechanism may also extend downward toward the patient. In all aspects, the change in length of the piston may be detected and used to modify movement of the piston, for example to more safely perform mechanical CPR.