Surgical Instrument Adaptor With Cam Drum Rotary-Linear Conversion
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Solution Overview
Problem
Surgical instruments with rotary driven actuators are not compatible with linearly driven loading units, which are necessary for procedures like suturing, endo-gastrointestinal anastomosis, and transverse anastomosis, requiring an adapter to interface between these different types of actuation systems.
Innovation Solution
An adaptor with a cam drum and linear drivers that translate rotary motion into linear motion, allowing compatibility between rotary driven surgical devices and linearly driven loading units, featuring a casing, cam drum, first and second linear drivers, and a lead screw that converts rotation into longitudinal translation, enabling the adaptation of rotary motion to linear motion for surgical procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotary driven actuator is used in the surgical instrument, then the device can be operated with a standard rotary interface, but it cannot be compatible with linearly driven loading units required for suturing and anastomosis procedures
Solution Approach 1:
The adapter assembly serves as an intermediary device that couples the rotary driven actuator to the linearly driven loading unit. It includes a cam drum with cam grooves that convert rotary motion into linear motion of the drive shaft, enabling compatibility between the rotary interface and linear loading unit without requiring modification of either component
Solution Approach 2:
The adapter changes the motion parameter from rotary to linear through the cam mechanism. The cam grooves are designed with specific profiles that transform the rotational movement of the cam drum into precise linear displacement of the drive shaft, allowing the loading unit to be actuated correctly despite the rotary input
2Adaptability or versatility
If an adapter assembly is introduced to enable compatibility, then linearly driven loading units can be used with rotary devices, but the device complexity and number of components increases
Solution Approach 1:
The adapter assembly merges multiple functions into a single integrated component structure. It combines the cam drum, cam grooves, drive shaft coupling, and locking mechanisms into one compact adapter unit that can be selectively attached to the surgical instrument, reducing the need for separate components while maintaining adaptability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the use of linearly driven loading units with rotary driven surgical instruments, facilitating advanced surgical techniques by providing a compatible interface for procedures that require linear actuation, thus enhancing the compatibility and functionality of surgical devices.
Implementation Method 1
The cam drum is supported for rotation about the longitudinal axis and defines first and second radial cam grooves about an outer surface thereof. The first linear driver includes a first cam follower disposed in the first cam groove. The first linear driver is supported for movement between advanced and retracted positions in relation to the cam drum along an axis parallel to the longitudinal axis in response to rotation of the cam drum about the longitudinal axis.
Implementation Method 2
The adaptor includes a lead screw that is rotatable about the longitudinal axis. The lead screw may be received within a lead screw passage defined by cam drum. Rotation of the cam drum may effect longitudinal translation of the cam drum and the first and second linear drivers along the longitudinal axis.
Data Source
AI summary
An adaptor for a powered surgical instrument includes a casing, a cam drum, a first linear driver, and a second linear driver. The cam drum defines and is translatable along a longitudinal axis of the adaptor between a retracted position and an advanced position. The cam drum is being supported for rotation about the longitudinal axis. The cam drum defines first and second radial cam grooves about an outer surface thereof. The first cam groove defines a first profile and the second cam groove defines a second profile. The first linear driver includes a first cam follower disposed in the first cam groove and the second linear driver includes a second cam follower disposed in the second cam groove. The first and second linear drivers are supported for movement between advanced and retracted positions in response to rotation of the cam drum.