Wireless Bed-Wall Link Protocol for Hospital Nurse Call Systems
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Solution Overview
Problem
Existing patient movement and bed position detection systems in healthcare environments face challenges due to physical cables that can be easily disconnected or forgotten during bed relocation, leading to interference and unreliable communication links between bed and wall units, which can result in data corruption and failure to maintain patient monitoring and alerting capabilities.
Innovation Solution
A wireless communications link and associated protocol between bed and wall units that operate within unlicensed spectrum, utilizing a linking procedure to prevent cross-linking and detect collisions, adjust message timing or frequency to avoid interference, and shift to different channels to maintain reliable communication, while also incorporating a link reminder feature to prompt healthcare providers to reconnect units when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a physical cable connects the bed unit to the nurse call system, then the connection is stable and reliable, but the cable can be easily disconnected or forgotten during bed relocation, leading to communication failure
Solution Approach 1:
The patent replaces the mechanical cable connection system with a wireless communication system. The bed unit and wall unit establish communication through wireless signals in the unlicensed spectrum, eliminating the physical cable that causes disconnection issues during bed relocation while maintaining reliable communication links.
Solution Approach 2:
The patent introduces a linking procedure as an intermediary mechanism that manages the wireless connection between bed and wall units. This linking procedure includes collision detection and avoidance techniques that mediate potential interference from other devices, ensuring stable communication without requiring physical cable connections.
2Adaptability or versatility
If multiple bed and wall units operate in the same unlicensed spectrum, then wireless communication flexibility is improved, but interference and collisions between links increase
Solution Approach 1:
The patent implements feedback mechanisms through collision detection in the linking procedure. When interference or collisions are detected between multiple wireless links operating in the unlicensed spectrum, the system responds by adjusting transmission parameters or selecting alternative channels, maintaining reliable communication while allowing multiple devices to operate flexibly.
Solution Approach 2:
The patent employs dynamic channel selection and timing adjustment in the linking procedure. The system can dynamically adapt transmission characteristics based on detected interference levels, allowing multiple bed and wall units to coexist in the same unlicensed spectrum while maintaining link stability through real-time adjustments.
Data Source
AI summary
A communications system and protocol are described for wirelessly interconnecting a pair of bed and wall units that communicate the patient information, including bed exit alerts, from the patient supporting equipment to the hospital nurse call system. A linking procedure is provided for establishing a communications link to interconnect the pair of units, wherein the communications link fails upon detection of a third communications device simultaneously undergoing the link attempt mode. In one embodiment, the system provides for advanced collision detection by monitoring corruption of the end-of-packet byte within the periodic check-in message sequences between the linked units to prevent data corruption and future collisions. To ensure prompt interconnection of units, embodiments of the invention provide for a link reminder to alert the health care provider to initiate the steps for linking the bed and wall units whenever two or more unlinked units are in proximity.