Bi-Spring Surgical Hammer Impact Tool with Motor-Driven Eccentric Cam
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Solution Overview
Problem
Orthopedic surgeons face challenges with existing surgical impact tools that require hammers or pneumatic tools, leading to joint stress and limited tool orientation due to the need for air hoses.
Innovation Solution
A bi-spring surgical impact tool with a housing, elongated drive rod, impact shuttle, and motor-driven mechanism, featuring a force control mechanism that adjusts impact force through a shaft helix and rotary member with detents, allowing for battery-powered operation and reduced user fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a hammer or pneumatic tool is used to transmit impaction force, then the surgical procedure can be performed, but the physician experiences joint stress and user fatigue
Solution Approach 1:
The patent replaces the traditional manual hammering mechanical system with a motor-driven impact tool that uses an eccentric cam mechanism to generate controlled impacts. The motor rotates an eccentric cam that converts rotational motion into linear impact motion, eliminating the need for the physician to manually wield a hammer and thereby reducing joint stress while maintaining effective impaction force delivery.
2Force
If a pneumatic impact tool is used, then impaction force can be delivered, but the tool orientation is limited due to air hose connection requirements
Solution Approach 1:
The patent employs a pneumatic motor that operates independently of external air hose connections. The pneumatic motor is self-contained within the tool housing, allowing the tool to be oriented and positioned freely during surgical procedures without the constraints imposed by external pneumatic supply lines.
3Productivity
If manual hammering is used, then the surgical procedure can be performed, but the operation becomes tiresome and time-consuming
Solution Approach 1:
The impact tool is designed to be self-operating once activated. The motor automatically generates the impact forces through the eccentric cam mechanism without requiring continuous manual intervention. The physician simply positions the tool and activates it, and the system self-regulates the impact delivery, significantly reducing user fatigue and improving surgical efficiency.
4Ease of operation
If a motor-driven impact mechanism is implemented, then user fatigue is reduced, but the device complexity increases
Solution Approach 1:
The tool is divided into distinct functional modules: a motor housing containing the pneumatic motor, an eccentric cam mechanism for impact generation, a broach holder for tool attachment, and a handgrip for physician control. This segmentation allows each component to be optimized independently and simplifies assembly, maintenance, and sterilization while managing overall device complexity.
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 bi-spring surgical impact tool provides a robust, efficient, and ergonomic solution for delivering controlled impact forces, reducing user fatigue and enhancing tool orientation flexibility during surgical procedures.
Implementation Method 1
a first spring disposed against a first end of the impact shuttle; a second spring disposed against a second end of the impact shuttle
Implementation Method 2
a motor having a drive shaft; and a partial tooth pinion attached to the drive shaft
Data Source
AI summary
Disclosed herein are bi-spring surgical hammer impact tools and methods of use thereof. The bi-spring surgical hammer impact tools can include an elongated drive rod disposed in the housing and including an impact flange in a mid-region thereof. A tool implement can be mounted to a first end of the elongated drive rod. An impact shuttle can be mounted on the elongated drive rod and can include first and second impact surfaces opposing opposite faces of the impact flange. A plurality of annular teeth can be defined by an exterior surface of the impact shuttle. First and second springs can be disposed against opposite ends of the impact shuttle. A partial tooth pinion attached to a drive shaft and movable for engagement with the plurality of annular teeth of the impact shuttle can be included.