Side Rail Assembly with Damper for Patient Support
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Solution Overview
Problem
The repetitive and physically demanding task of manually raising and lowering side rails on patient support apparatuses, such as hospital beds, poses a challenge due to the weight and bulk of the side rails.
Innovation Solution
A patient support apparatus with side rail assemblies that include a support arm arrangement and a lock mechanism, allowing for easy adjustment of side rail positions with reduced manual effort. The side rail assembly features a four-bar mechanism for maintaining orientation and a damper for counterbalancing the side rail's weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual raising and lowering of side rails is performed, then the side rail can be adjusted between positions, but physical strain on caregivers increases due to weight and bulk
Solution Approach 1:
A damper assembly is integrated into the side rail assembly to counterbalance the weight of the side rail during movement. The damper provides a force that opposes the gravitational force acting on the side rail, reducing the net force required by the caregiver to raise or lower the side rail. This directly addresses the technical contradiction by maintaining ease of operation while reducing physical strain through force counterbalancing.
2Strength
If side rail weight is increased for structural stability, then support strength improves, but ease of manual adjustment deteriorates
Solution Approach 1:
The damper assembly counterbalances the weight of the heavier side rail structure, allowing the side rail to maintain increased strength for structural stability while compensating for the reduced ease of manual adjustment. The damper offset the additional weight, enabling caregivers to easily adjust even the heavier, more robust side rails.
3Ease of operation
If damper is added to counterbalance side rail weight, then ease of adjustment improves, but device complexity increases
Solution Approach 1:
The damper assembly is integrated with the existing side rail assembly components, merging the counterbalancing function with the structural elements already present. The support arm arrangement and lock mechanism work together with the damper as a unified system, reducing the need for separate independent components and minimizing overall device complexity while still providing ease of adjustment.
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 solution reduces the physical strain on caregivers by allowing for effortless adjustment of side rail positions, improving user safety and comfort while maintaining the stability and security of the patient support apparatus.
Implementation Method 1
a damper for counterbalancing the side rail's weight
Data Source
AI summary
A patient support apparatus includes a support structure having a patient support deck and a side rail coupled to the support structure. The side rail is movable relative to the support structure. A lock releasably locks the side rail in one or more side rail positions, such as in a raised position and an intermediate position. A manual release is coupled to the side rail and operable to unlock the side rail. A bypass lever is provided to allow a user to raise the side rail from a lowered position to the raised position without locking in the intermediate position. A damper is located inside the side rail to counterbalance the weight of the side rail and assist the user in raising the side rail, bi-directionally. The side rail is formed of first and second walls that are heat staked together to form a lightweight side rail of suitable strength.