Reverse Cam Liposuction Cannula Motion Conversion

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Solution Overview

Problem

Conventional power-assisted liposuction devices have complex structures, leading to increased volume and weight, user fatigue, and difficulty in precise control due to their complicated mechanisms for converting rotary motion into linear reciprocating motion of the cannula.

Innovation Solution

A power-assisted liposuction device with a reverse cam that converts rotary motion from a motor into a linear reciprocating motion of the cannula, featuring a simple structure, lightweight design, and a small-sized motor with a reducer, allowing effective fat suction with reduced user fatigue.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a complicated driving device with multiple gears is used to convert rotary motion into linear reciprocating motion of the cannula, then the cannula can perform reciprocating motion for fat suction, but the structure becomes complex and the volume and weight of the handpiece increase

Engineering Contradiction:

Improvecannula reciprocating motionVSAvoiddriving device structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent extracts the essential function of motion conversion from the complex multi-gear system and implements it through a single reverse cam mechanism. The reverse cam directly converts rotary motion to linear reciprocating motion without requiring intermediate gear trains, thereby simplifying the driving device structure while maintaining the cannula's reciprocating motion capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of using conventional gear mechanisms to achieve reciprocating motion, the patent inverts the approach by using a reverse cam that directly transforms rotary motion into linear reciprocating motion. This inversion of the motion conversion method eliminates the need for complicated gear arrangements and reduces the overall device complexity

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of operation

Engineering Contradiction:

Improvecannula reciprocating motionVSAvoidhandpiece weight

Core Design Contradiction:

Ease of operationVSWeight of moving object

Solution Approach 1:

The patent removes unnecessary intermediate components (multiple gears) from the motion conversion system and retains only the essential reverse cam mechanism. This extraction of essential function reduces the mass of moving parts, thereby decreasing the handpiece weight while maintaining the cannula's reciprocating motion capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

By inverting the conventional approach and using a reverse cam instead of gear trains, the patent achieves motion conversion with fewer and lighter components. This inverted mechanism significantly reduces the weight of the handpiece while still enabling effective cannula reciprocating motion for fat suction

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of operation

If a complicated driving device with multiple gears is used to convert rotary motion into linear reciprocating motion of the cannula, then the cannula can perform reciprocating motion for fat suction, but the user feels fatigue and has difficulty in precisely controlling the device

Engineering Contradiction:

Improvecannula reciprocating motionVSAvoiduser control precision

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent extracts the core motion conversion function from the complex gear system and implements it through a streamlined reverse cam mechanism. This reduction in mechanical complexity decreases the moment of inertia and improves the responsiveness of the cannula, allowing users to maintain precise control with less fatigue during prolonged use

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

By inverting the conventional gear-based approach and adopting a reverse cam mechanism, the patent creates a more agile and responsive system. The simplified mechanism requires less force to operate and responds more directly to user input, thereby improving control precision and reducing user fatigue during liposuction procedures

Inventive Principle:

Principle #13The other way round (Inversion)

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 device achieves efficient fat suction with a simplified structure, reduced user fatigue, and improved control precision, while maintaining a compact size and sufficient torque for effective liposuction procedures.

Implementation Method 1

a reverse cam of which one end is connected to the motor; and a cannula connected to the other end of the reverse cam. Here, the reverse cam converts a rotary motion of the motor into a linear reciprocating motion

Methodology Applied

Scientific EffectCam mechanism: Cam

Data Source

PatentUS20220211412A1Power-assisted liposuction device

Publication Date: 2022.07.07 LHBIOMED CO LTD

AI summary

The present invention relates to a power-assisted liposuction device. The power-assisted liposuction device includes: a handpiece; a motor mounted inside the handpiece and connected with a power source to provide driving force; a reverse cam of which one end is connected to the motor; and a cannula connected to the other end of the reverse cam. The reverse cam converts a rotary motion of the motor into a linear reciprocating motion so that the cannula performs a reciprocating motion when the motor is operated.