Removable Bed Guard Assembly with Dual-Safety Locking Mechanism
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Solution Overview
Problem
Existing hospital bed guards lack complete protection against spontaneous unlocking and movement, often relying on single safety elements that can be overcome unintentionally, posing risks to patient safety and ease of operation.
Innovation Solution
A removable guard assembly with a dual-safety locking mechanism featuring a sleeve and blocking member actuated by an upper-end actuator, which moves between locked and unlocked positions to prevent movement of the main support relative to the sleeve, incorporating a flexible member for secure locking and a lever mechanism for operation, enhancing ease of use and cleanability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single safety element locking mechanism is used, then the device complexity is reduced, but the reliability against spontaneous unlocking deteriorates
Solution Approach 1:
The locking mechanism is divided into two independent safety elements: a primary locking element that engages with the sleeve, and a secondary blocking member that prevents rotation. This segmentation ensures that both elements must be simultaneously overcome for the guard to become loose, significantly improving reliability without excessive complexity.
Solution Approach 2:
The design incorporates a blocking member that预先 (in advance) prevents rotational movement before any unintended loosening can occur. The blocking member acts as a preventive measure, cushioning against the harmful effect of spontaneous unlocking by physically blocking the rotation path.
2Reliability
If the guard is permanently fixed to the bed frame, then the reliability of patient protection is improved, but the ease of operation for patient transfer deteriorates
Solution Approach 1:
The guard assembly transitions from a static permanently fixed state to a dynamic removable state. The locking mechanism allows the guard to be securely fixed during use (reliability) but can be easily removed when patient transfer is needed (ease of operation). This dynamic capability resolves the contradiction between permanent fixation and operational flexibility.
Solution Approach 2:
The locking mechanism acts as an intermediary between the guard and the bed frame. It provides a secure connection during normal operation while allowing for easy disconnection when needed. The actuator serves as a mediator that enables simple operation for both securing and removing the guard.
3Adaptability or versatility
If the guard allows large range rotation, then the adaptability for different positions is improved, but the harmful factor of pinching patient limbs deteriorates
Solution Approach 1:
The blocking member预先 (in advance) counteracts the harmful rotational movement by engaging with the sleeve to limit the rotation angle. This preliminary anti-action prevents the guard from rotating beyond the safe range, thereby preventing pinching of patient limbs while still allowing adequate adjustment for different positions.
Solution Approach 2:
The rotation limitation is applied locally at the critical interface between the guard and the bed frame through the blocking member and sleeve interaction. This local constraint allows the guard to rotate sufficiently for patient comfort while preventing excessive rotation that would cause harm, applying the principle of local quality control.
Data Source
Figure 1
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AI summary
The bed (1) consists of a frame (3), mattress platform (4), siderail (8) and removable bed guard assembly (5). The bed guard assembly (5) includes a main support (7) which at the lower end has a mounting for connection to the bed (1), a guard (6) permanently fixed to the main support (7) and a locking mechanism (13) for fixing the main support (7) in relation to the bed (1). The locking mechanism (13) is located inside the guard assembly (5) and includes a sleeve (11) and blocking element (19) which moves between two positions. In one position the blocking element (19) engages in the sleeve (11), and in the second position the blocking element (19) is released from the sleeve (11), where in one of these positions it allows the movement of the main support (7) in relation to the sleeve (11), and in the second of these positions it prevents the movement of the main support (7) in relation to the sleeve (11), the movement of the blocking element (19) of the locking mechanism (13) is controlled by the actuator (10).