Multipurpose Sensor Port for Pulse Oximeter Firmware Updates
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Solution Overview
Problem
Pulse oximeters require complex and non-standard protocols for firmware updates, especially when integrated into host instruments, making field upgrades difficult, especially for handheld devices without communication ports, which often necessitate returning the device to the factory.
Innovation Solution
A multipurpose sensor port that can connect both analog and digital data sources, allowing for firmware updates through a standard interface like RS-232, enabling easy field upgrades without hardware modifications by identifying connected devices and facilitating bi-directional communication between the pulse oximeter and external computers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a standard interface like RS-232 is used for firmware updates, then ease of operation is improved, but device complexity increases due to supporting both analog and digital connections
Solution Approach 1:
The sensor port is designed to support multiple functions: it can connect to both analog physiological sensors and digital data sources (such as firmware update devices via RS-232 interface). The system automatically detects the connection type and routes signals appropriately, allowing a single port to serve dual purposes without requiring separate dedicated ports for each function.
2Manufacturing precision
If custom protocols are used for firmware updates in integrated pulse oximeters, then manufacturing precision is improved, but ease of manufacture worsens due to non-standard interfaces
Solution Approach 1:
The sensor port circuitry is designed to handle both physiological signal inputs and digital communication protocols through the same physical interface. The system includes detection logic that identifies whether a connected device is a physiological sensor or a digital data source, and automatically configures the appropriate signal processing path, eliminating the need for separate dedicated firmware update ports.
3Weight of moving object
If handheld devices without communication ports are used, then portability is improved, but reliability worsens due to inability to perform field upgrades
Solution Approach 1:
The sensor port is configured to accept digital data sources in addition to physiological sensors. When a digital device is detected at the sensor port, the system establishes a bi-directional communication path that enables firmware update operations. This allows handheld pulse oximeters to perform field firmware upgrades through the existing sensor port without requiring separate communication ports or returning devices to the factory.
Data Source
AI summary
A sensor port is adapted to connect to either a sensor or a data source. A reader is configured to identify which of the sensor and the data source is connected to the sensor port. A data path is configured to communicate an analog signal associated with the sensor and digital data associated with the data source to a signal processor according to the identification made by the reader.