Surgical End Effector Connector Assembly for Durable Power Transfer
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Solution Overview
Problem
Existing teleoperated surgical instruments face challenges in providing durable drive elements and electrical connections within the limited space of a surgical instrument, leading to issues such as permanent deformation and wear due to concentrated force distribution.
Innovation Solution
The surgical instrument incorporates a push/pull drive element with enlarged end portions and a connector assembly to distribute forces more evenly, using materials like PEEK and insulative plastics to enhance durability and maintain electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional drive element with uniform cross-section is used, then the structure is simple and easy to manufacture, but the force distribution is concentrated leading to permanent deformation and wear
Solution Approach 1:
The drive element features a non-uniform cross-section where the end portion has a larger cross-sectional area than the main portion. This local variation in geometry concentrates the structural reinforcement exactly where the force application occurs, distributing stress more effectively without adding complexity to the entire drive element structure.
2Reliability
If the end portion of the drive element has a larger cross-section, then the force distribution is improved reducing wear and deformation, but the manufacturing complexity increases
Solution Approach 1:
The cross-sectional area parameter of the drive element is varied along its length, with the end portion having a larger cross-sectional area than the main portion. This parameter change optimizes the stress distribution and mechanical properties without requiring complex manufacturing processes, as the gradient can be achieved through standard forming techniques.
3Reliability
If a connector assembly is used to provide electrical connection, then the electrical energy transfer is reliable, but the space required within the surgical instrument increases
Solution Approach 1:
The connector assembly integrates multiple functions including electrical connection, mechanical coupling, and alignment features into a single compact unit. This merging of functions provides reliable electrical energy transfer to the end effector while minimizing the space required within the constrained surgical instrument structure.
Data Source
AI summary
An apparatus configured to deliver electrical energy to energize an end effector coupled via a clevis to a shaft of a medical instrument comprises an electrical transmission conduit configured to extend along the shaft from a proximal portion to a distal portion and configured to deliver electrical energy to energize the end effector, and a connector assembly configured to couple to the end effector. The connector assembly comprises an electrically conductive contact portion configured to electrically couple the electrical transmission conduit to the end effector, the electrically conductive contact portion defining a pivot surface about which the end effector is rotatable in a coupled state of the connector assembly to the end effector; and an electrically insulating member configured to electrically insulate the end effector from the clevis in a coupled state of the connector assembly to the end effector.