Vibrating Liposuction Cannula Using Low-Frequency Tissue Loosening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liposuction devices are limited in tissue harvesting range due to small incision size and often cause contour defects, while high-frequency vibrations can lead to tissue trauma.
Innovation Solution
A vibrating hand-held surgical instrument with a motor, rotating flexible shaft, and eccentric rotating mass imparts low-frequency vibratory motion to a cannula, allowing wider tissue harvesting without increasing incision size and minimizing tissue trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency vibrations are used to loosen tissue, then tissue loosening effectiveness is improved, but tissue trauma increases
Solution Approach 1:
The patent changes the vibration frequency parameter from high-frequency to low-frequency range. The cannula vibrates at frequencies below 100 Hz, specifically in the range of 20-80 Hz, which is sufficient to loosen fibrous tissue while avoiding the traumatic effects of high-frequency vibrations. This parameter change resolves the contradiction by finding an optimal frequency sweet spot that achieves tissue loosening without causing excessive trauma.
Solution Approach 2:
The patent employs mechanical vibration of the cannula itself rather than traditional reciprocating motion. The motor-driven cannula vibrates in place, creating a pulsating mechanical action that effectively breaks up fibrous tissue capsules and loosens adipose tissue. This vibrational mechanism achieves superior tissue loosening compared to linear reciprocation while using lower frequencies to minimize trauma.
2Shape
If small incision size is used to minimize scarring, then cosmetic outcome is improved, but tissue harvesting range is limited
Solution Approach 1:
The patent transforms the harvesting mechanism from linear reciprocating motion (one-dimensional) to multi-directional vibration (three-dimensional). The cannula vibrates in multiple planes simultaneously, expanding the effective harvesting radius beyond the cannula diameter. This dimensional change allows fat to be harvested from a wider area through the same small incision, resolving the contradiction between incision size and harvesting range.
Solution Approach 2:
The patent segments the tissue disruption function from the harvesting function. The vibrating cannula tip segments and loosens tissue in a radial pattern around the cannula axis, creating multiple harvesting zones simultaneously. This segmentation allows fat cells to be liberated from a broader volume of tissue while still passing through the same small-diameter cannula through the limited incision.
3Productivity
If reciprocating cannula motion is used to harvest fat, then fat harvesting is achieved, but surgeon fatigue increases
Solution Approach 1:
The patent implements self-service by making the cannula itself the source of vibrational energy through an integrated motor. The cannula vibrates autonomously without requiring manual reciprocating motion by the surgeon. This eliminates the physically demanding back-and-forth pushing and pulling action, dramatically reducing surgeon fatigue while maintaining effective fat harvesting capability.
Solution Approach 2:
The patent substitutes manual mechanical reciprocating motion with an electromechanical vibration system. A small motor integrated into the handpiece generates high-frequency vibrations that are transmitted to the cannula tip, replacing the surgeon's manual reciprocating action. This mechanical substitution maintains harvesting effectiveness while eliminating surgeon fatigue associated with manual operation.
4Productivity
If linear reciprocating motion is used to loosen tissue, then tissue loosening is achieved, but harvesting region is limited to cannula diameter
Solution Approach 1:
The patent transitions from one-dimensional linear reciprocating motion to three-dimensional vibrational motion. The cannula vibrates in multiple planes (radial and axial directions simultaneously), expanding the tissue disruption zone from a linear path to a three-dimensional volume around the cannula. This dimensional expansion increases the effective harvesting region beyond the cannula diameter while maintaining efficient tissue loosening.
Solution Approach 2:
The patent uses mechanical vibration to create a radial disruption pattern around the cannula tip. The vibrational energy propagates outward in all directions, loosening tissue in a spherical or conical zone rather than just along the linear path of reciprocation. This vibrational approach expands the harvesting region to approximately 2-3 times the cannula diameter while achieving thorough tissue loosening.
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 efficiently loosens tissue beyond the cannula diameter, enhances fat harvesting efficiency, and reduces contour defects by using low-frequency vibrations, preserving tissue integrity and facilitating even re-draping.
Implementation Method 1
A motor rotates an eccentric mass to vibrate a cannula to loosen tissue
Implementation Method 2
A motor rotates an eccentric mass to vibrate a cannula
Implementation Method 3
A rotating flexible shaft connects the motor to a vibration actuator
Data Source
AI summary
A vibrating hand held surgical instrument for loosening tissue of a patient for liposuction or body contouring procedures. The instrument includes a motor connected to a vibration actuator having an eccentric rotating mass and an end effector for engaging tissue operatively connected to the vibration actuator, wherein the motor rotates the eccentric mass to cause the end effector to vibrate to loosen tissue. A flexible shaft having first end and second ends dampen the vibration to the motor and to the operator handle.