Robotic Surgical Tool Attachment Signaling for Sterile Barrier Control
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Solution Overview
Problem
Conventional robotic surgical systems face challenges in maintaining a sterile environment during minimally-invasive surgery, as components like motors and sensors cannot be sterilized conventionally, and existing sterile barriers may interfere with tool actuation or complicate tool swapping.
Innovation Solution
A system using a tool driver with sensors to determine attachment states between the tool driver, sterile adapter, and surgical tool, ensuring proper engagement and formation of a sterile barrier, with visual and haptic feedback to operators for efficient tool switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sterile barrier is provided between the tool driver and surgical tool, then sterility is maintained, but the sterile barrier may interfere with tool driver actuation of the surgical tool
Solution Approach 1:
A sterile adapter is introduced as an intermediary component between the non-sterile tool driver and the sterile surgical tool. The adapter includes a sterile barrier that maintains sterility while incorporating drive interface features (drive inputs and drive outputs) that enable mechanical coupling and actuation transmission through the barrier without compromising either sterility or tool actuation capability
Solution Approach 2:
The system is segmented into distinct sterile and non-sterile zones separated by the sterile adapter. The adapter itself is segmented with a sterile barrier portion and drive interface portions that allow controlled interaction between zones. This segmentation enables maintaining sterility in the surgical field while allowing non-sterile components to remain outside the sterile field
2Reliability
If conventional sterilization methods are used, then sterility is achieved, but components like motors and sensors cannot be sterilized
Solution Approach 1:
The sterile adapter acts as a mediator that separates sterilizable components (adapter and surgical tool) from non-sterilizable components (tool driver with motors and sensors). The adapter is designed to be sterilizable while the tool driver remains outside the sterile field, eliminating the need to sterilize electronic components
Solution Approach 2:
The non-sterilizable electronic components (motors, sensors) are extracted from the sterile field and placed in the tool driver housing that remains outside the sterile barrier. Only the sterile adapter and surgical tool, which can withstand sterilization, are placed within or cross the sterile field
3Ease of operation
If manual confirmation of proper attachment is required, then operator control is maintained, but operator error and inefficiency increase
Solution Approach 1:
Sensors are incorporated to detect and provide feedback on the attachment state between components. The system can detect when the surgical tool is properly attached to the sterile adapter and when the adapter is properly attached to the tool driver, providing automated confirmation that reduces operator error while maintaining operational control
4Reliability
If a sterile barrier is provided to maintain sterility, then contamination is prevented, but tool swapping becomes more complex
Solution Approach 1:
The sterile adapter serves as a reusable intermediary that remains attached to the tool driver during tool swaps. Only the surgical tool needs to be exchanged while the adapter maintains the sterile barrier, simplifying the swapping procedure compared to replacing the entire sterile barrier assembly with each tool change
Data Source
AI summary
Generally, a system for use in a robotic surgical system may be used to determine an attachment state between a tool driver, sterile adapter, and surgical tool of the system. The system may include sensors used to generate attachment data corresponding to the attachment state. The attachment state may be used to control operation of the tool driver and surgical tool. In some variations, one or more of the attachment states may be visually output to an operator using one or more of the tool driver, sterile adapter, and surgical tool. In some variations, the tool driver and surgical tool may include electronic communication devices configured to be in close proximity when the surgical tool is attached to the sterile adapter and tool driver.