Rotary Cam Drive for Surgical Stapler Precision
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Solution Overview
Problem
Current surgical staplers lack a reliable mechanism for simultaneously severing and stapling tissue with precise control over staple deployment and tissue cutting, particularly in minimally invasive procedures where manual dexterity is limited.
Innovation Solution
A circular surgical stapling instrument with a rotary cam drive system that integrates a motorized staple driver and knife, allowing for precise control over staple deployment and tissue cutting, ensuring complete anastomosis formation with reduced operator error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a manual surgical stapler is used, then the surgeon can perform stapling and cutting, but precise control over staple deployment and tissue cutting is difficult when manual dexterity is limited
Solution Approach 1:
The patent replaces the manual mechanical operation system with a motorized drive system. A motor coupled to a rotary cam provides automated longitudinal movement of the staple driver and knife, eliminating the need for manual dexterity while maintaining precise control over staple deployment and tissue cutting through engineered cam profiles.
2Reliability
If simultaneous stapling and cutting is performed, then complete anastomosis formation is achieved, but control over the sequencing and coordination of these functions becomes more complex
Solution Approach 1:
The patent merges the stapling and cutting functions into a single integrated cartridge assembly. The staple driver and knife are positioned adjacently and driven simultaneously by a common motor-cam mechanism, ensuring coordinated action without requiring separate control systems. This integration simplifies the overall device architecture while guaranteeing that both functions are performed together for complete anastomosis.
Solution Approach 2:
The rotary cam is pre-configured with specific profile geometries that determine the exact sequence and timing of staple deployment and tissue cutting. The cam profile is designed in advance to first drive the staple driver forward, then the knife, ensuring proper sequencing without complex real-time control mechanisms.
3Measurement precision
If a motorized rotary cam drive system is implemented, then precise control over staple deployment and tissue cutting is achieved, but the device complexity increases
Solution Approach 1:
The rotary cam mechanism serves multiple functions simultaneously: it converts rotational motor motion into longitudinal linear motion, provides precise positioning control, sequences the activation of multiple components (staple driver and knife), and ensures controlled reciprocating motion. This multi-functionality reduces the need for separate mechanical components, actually simplifying the overall system despite the added precision capabilities.
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
The instrument ensures consistent and complete stapling and cutting of tissue, enhancing the precision and reliability of surgical procedures, especially in situations where manual dexterity is compromised.
Implementation Method 1
a rotary cam in communication with the motor and configured to convert rotational motion of the motor to longitudinal motion of the staple driver and knife
Data Source
AI summary
A surgical circular stapler has a body, shaft, a stapling assembly, a motor, a cam assembly, and a firing assembly. The shaft extends distally from the body. The stapling assembly is secured to a distal end of the shaft. Longitudinal translation of the firing assembly causes the stapling assembly to drive a plurality of staples in a circular array to secure two lumens of tissue together. The stapling assembly may further drive a blade to sever any excess tissue interior of the circular array of staples. The motor is operable to rotate the cam assembly. Rotation of the cam assembly causes longitudinal translation of the firing assembly. A single rotation of the cam assembly is operable to drive the firing assembly from a proximal position to a distal position and back to a proximal position.