Surgical Forceps Rolling Body Mechanism for High Shear
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Solution Overview
Problem
Surgical pliers for cutting implants and medical wires face challenges with high shear forces, complex designs leading to difficulty in cleaning, and alignment issues that prevent effective sterilization and ease of use.
Innovation Solution
The design incorporates a rolling body between the pressure lever and lever arm, allowing for a high gear ratio and quasi-parallel alignment of jaw parts, with detachable components for easy cleaning and tool element exchange, featuring concave receptacles as bearings instead of traditional joints for reduced friction and enhanced force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple toggle lever drives with fixed connections are used to generate high shear forces, then cutting capability is improved, but device complexity and difficulty of cleaning increase
Solution Approach 1:
The pliers are divided into separable components: a handle part, a lever arm, and a jaw part that can be detached from each other. This segmentation allows each component to be simplified and easily cleaned separately, while still achieving the required force transmission through the rolling body mechanism during assembly.
2Power
If complex joint structures are used to achieve high gear ratio, then force transmission is improved, but ease of cleaning deteriorates
Solution Approach 1:
The complex joint structures are extracted and replaced with a simple rolling body mechanism. The rolling body interacts with inclined surfaces on the lever arm and handle part to achieve high gear ratio and force transmission, eliminating the need for complex pinned joints while maintaining mechanical advantage.
Solution Approach 2:
Traditional pinned joint mechanisms are replaced with a rolling contact system. The rolling body moves along inclined surfaces to transmit force, substituting complex rotational joints with a simpler rolling motion that achieves the same mechanical advantage with fewer parts and easier cleaning.
3Adaptability or versatility
If cutting edges are spread apart to accommodate thick implants, then adaptability is improved, but alignment precision deteriorates
Solution Approach 1:
The jaw parts are designed to be dynamically adjustable and self-aligning during the closing motion. The inclined surfaces guide the rolling body and jaw parts into proper alignment as they close, ensuring precise meeting of cutting edges even when the pliers are opened wide to accommodate thick implants.
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
This design enables efficient cutting of thick implants with reduced friction, facilitates easy cleaning and sterilization, and allows for one-handed operation while ensuring the tool elements remain aligned for precise cutting without slippage.
Implementation Method 1
a rolling body (5) arranged between the pressure lever (3) and the lever arm (4), by which a force can be transmitted from the pressure lever (3) to the lever arm (4)
Implementation Method 2
concave receptacles as bearings instead of traditional joints for reduced friction and enhanced force transmission
Implementation Method 3
a lever arm (4) arranged between the handle part (2) and the pressure lever (3), which can be pressurized by the pressure lever (3)
Implementation Method 4
pivotally mounted relative to the handle part (2), with a pivot/pivot point (13.1) on a side of the lever arm (4) facing away from the jaw part (7.2)
Data Source
Figure 1~2
Figure 3
Figure 4~7
AI summary
The invention relates to forceps, in particular surgical forceps, comprising at least one handle and a pressure lever which is mounted in a pivotal manner relative to the handle and comprising a jaw consisting of two jaw parts, one of which is provided on the handle. A lever arm is to be arranged between the handle and the pressure lever, wherein the lever arm has the second jaw part and pressure can be applied to the lever arm by the pressure lever.