Ultrasonic Scalpel Rod Support Ring Structure for Lower Impedance

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Solution Overview

Problem

Conventional scalpel rod assemblies of ultrasonic scalpels face issues with increased impedance due to support rings, which can lead to overheating, and the use of glue during manufacturing can result in surface scratches and changes in vibration frequency.

Innovation Solution

A scalpel rod assembly design featuring a support ring with a first protrusion on an inner tube to reduce impedance, integrated connector and second support body for stability, and silicone rubber material for improved adhesion and seismic resistance, along with annular protrusions for sealing and assembly ease.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a support ring is provided on the scalpel rod to support it inside the outer sleeve, then the scalpel rod is supported and positioned, but the impedance of the scalpel rod is easily increased causing overheating

Engineering Contradiction:

Improvesupport stabilityVSAvoidscalpel rod temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The support ring is divided into multiple support protrusions (first protrusion, second protrusion, third protrusion) that are spatially separated. This segmentation reduces the continuous contact area between the support ring and scalpel rod, thereby reducing impedance and heat generation while maintaining support functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The support ring features localized support points (protrusions) rather than continuous contact. Each protrusion provides support at specific locations, creating local quality variations that reduce overall contact area and impedance while maintaining adequate support.

Inventive Principle:

Principle #3Local quality

2Strength

If the support ring is integrally molded on the scalpel rod by injection molding, then the support ring is firmly attached, but glue is easily spilled during processing and cleaning causing surface scratches and vibration frequency changes

Engineering Contradiction:

Improveattachment strengthVSAvoidscalpel rod surface quality

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The harmful element (excessive glue) is extracted or eliminated from the process. The support ring is designed to be molded without requiring excessive glue, and the protrusion structure allows for precise positioning without glue spillage, thereby preventing surface scratches.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The design accepts that the support ring may be a single-use or limited-life component that can be easily replaced rather than requiring perfect reusability. This reduces the need for complex precision cleaning processes that could cause surface damage.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS12611221B2Scalpel rod assembly of ultrasonic scalpel

Publication Date: 2026.04.28 SHANGHAI SHENGZHE MEDICAL TECH CO LTD

AI summary

Example embodiments disclose a scalpel rod assembly of an ultrasonic scalpel. The scalpel rod assembly includes a scalpel rod, an inner tube, and a support ring; the inner tube is sleeved outside the scalpel rod; the support ring includes a first support body, the first support body is provided on the inner wall of the inner tube, and a first protrusion protrudes from the first support body in a direction away from the inner tube until the first protrusion abuts against the scalpel rod.