Single-Wire Surgical Bus Interface Using Differential Signaling
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Solution Overview
Problem
Ultrasonic surgical instruments face communication challenges due to nodes with single-wire communication capabilities operating in environments where differential media would provide more reliable communication, leading to inefficiencies in data transmission between components.
Innovation Solution
A communication system that utilizes a single wire device to send temporal bitwise data as either dominant or passive states, allowing logic devices to separate these states into transmit and receive channels, which are then converted to a differential bus using transceiver operational amplifiers, enabling multiple single-wire capable nodes to communicate on a single differential bus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-wire communication is used between nodes, then device complexity is reduced, but communication reliability deteriorates due to electrical noise susceptibility
Solution Approach 1:
The patent introduces intermediary devices (transceiver logic, operational amplifiers, level shifters) that convert single-wire signals to differential signals. These intermediaries act as bridges between the simple single-wire interface and the noise-resistant differential medium, allowing nodes to maintain simple interfaces while achieving reliable communication through the differential bus.
Solution Approach 2:
The patent changes the electrical parameters of the communication medium by transitioning from single-wire voltage-level signaling to differential voltage signaling. This parameter change enables the system to exploit the noise-canceling properties of differential signaling while maintaining compatibility with single-wire capable nodes through conversion circuitry.
2Device complexity
If single-wire communication is used, then the number of electrical connections is reduced, but data transmission fidelity deteriorates in electrically noisy environments
Solution Approach 1:
The patent employs intermediary conversion circuits including differential transceivers and level shifters that preserve data integrity while adapting between single-wire and differential interfaces. These intermediaries ensure that data transmitted over the simple single-wire connection arrives at the differential bus with high fidelity, preventing information loss in noisy environments.
Solution Approach 2:
The patent substitutes electrical signal transmission characteristics by replacing single-wire voltage-level signaling with differential signaling. This substitution replaces the vulnerable electrical field coupling of single-wire communication with the more robust differential field coupling that rejects common-mode noise, thereby preserving data fidelity.
3Ease of manufacture
If single-wire communication interface is used, then ease of manufacture is improved, but communication robustness deteriorates
Solution Approach 1:
The patent segments the communication interface into distinct functional blocks: single-wire transceiver logic, differential transceivers, level shifters, and bus interface circuitry. This segmentation allows each component to be optimized and manufactured independently using standard processes, maintaining manufacturing simplicity while achieving robust differential communication through modular assembly.
Solution Approach 2:
The patent creates a universal communication interface that can accommodate both single-wire capable nodes and native differential nodes on the same bus. The conversion circuitry provides multi-functionality by adapting signals bidirectionally, allowing the system to maintain manufacturing simplicity across diverse node types while ensuring robust communication for all participants.
Data Source
AI summary
A single wire digital communication system for use with an ultrasonic surgical instrument and an ultrasonic surgical instrument including a single wire digital communication system. The single wire digital communication system includes first transmitter logic buffer and first receiver logic buffer operably coupled to a first single wire device via a first single wire communication bus. The single wire digital communication system also includes a first differential transceiver operational amplifier operably coupled to the first transmitter logic buffer via a first transmitter signal line and operably coupled to the first receiver logic buffer via a first receiver signal line. A second differential transceiver operational amplifier is operably coupled to the first differential transceiver operational amplifier via at least one differential bus. A second single wire device is operably coupled to the differential bus and configured to communicate with the first single wire device.