Phacoemulsification Needle Off-Axis Tip for Torsional Wobble
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Solution Overview
Problem
Phacoemulsification techniques using traditional straight needle tips with longitudinal handpieces do not produce effective results when adapted for torsional handpieces, leading to inadequate 'wobble' and inefficient emulsification during eye surgery.
Innovation Solution
Designing phacoemulsification needles with straight tips formed off-axis relative to the needle body, incorporating asymmetric configurations and offset aspiration passageways, which enhance eccentric motion and performance when used with torsional or elliptical handpieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional straight needle tips with longitudinal handpieces are used, then the design is simple and compatible with conventional handpieces, but the emulsification efficiency is inadequate when adapted for torsional handpieces
Solution Approach 1:
The needle tip is designed with an asymmetric configuration where the tip axis is offset from the needle body axis by a specific distance. This asymmetric geometry creates the necessary eccentric motion during torsional handpiece operation, enabling effective emulsification while maintaining a relatively simple overall needle structure.
Solution Approach 2:
The invention introduces an additional dimensional parameter - the offset distance between the tip axis and needle body axis. This dimensional change transforms the traditional coaxial design into an eccentric design, enabling the needle to generate effective wobble motion during torsional rotation without requiring complex mechanical mechanisms.
2Ease of operation
If straight needle tips are used with torsional handpieces, then the design maintains simplicity, but sufficient 'wobble' motion is not achieved for effective emulsification
Solution Approach 1:
The asymmetric offset between tip axis and needle body axis creates the necessary eccentricity for effective wobble motion during torsional operation, transforming the simple straight tip design into one that generates adequate emulsification motion without complex mechanisms.
Solution Approach 2:
The invention changes the geometric parameters of the needle tip by introducing an offset distance and specific angular orientation. This parameter modification enables the needle to achieve sufficient wobble motion during torsional rotation, improving ease of operation while maintaining design simplicity.
3Productivity
If off-axis tip design is implemented, then emulsification efficiency improves through enhanced wobble motion, but manufacturing precision requirements increase
Solution Approach 1:
The asymmetric offset design is implemented with specific dimensional parameters that can be precisely controlled during manufacturing. The defined offset distance and angular orientation provide clear manufacturing targets, enabling consistent production of the eccentric geometry required for effective emulsification.
Solution Approach 2:
The needle tip is pre-formed during manufacturing with the precise offset geometry built into the structure. This preliminary establishment of the asymmetric configuration ensures that the correct wobble motion is achieved during operation without requiring complex assembly or adjustment procedures, thereby managing manufacturing precision requirements.
4Ease of operation
If asymmetric needle configuration is used, then liquid infusion and aspiration effectiveness is improved, but device complexity increases
Solution Approach 1:
The asymmetric needle configuration with offset tip and aspiration ports is designed to optimize liquid flow dynamics during phacoemulsification. The asymmetric geometry creates effective liquid infusion and aspiration patterns while maintaining a relatively simple single-needle structure without requiring multiple separate components.
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 off-axis tip design improves phacoemulsification results by creating sufficient 'wobble' during torsional motion, enhancing emulsification efficiency and reducing tissue damage, while the asymmetric configuration ensures effective liquid infusion and aspiration.
Implementation Method 1
Electrical energy is applied to vibrate the needle at ultrasonic frequencies in order to fragment the diseased lens into small enough particles
Implementation Method 2
the needle having a straight needle tip with the tip being formed off-axis with respect to the hollow passage formed through the needle
Data Source
AI summary
A phacoemulsification needle having a hollow passageway terminates in a straight needle tip formed off-axis from the passageway, allowing the needle tip to move eccentrically when the needle is subjected to torsional or longitudinal vibratory motion. The tip may be flared or may be coextensive with the needle body. The aspiration passageway formed through the needle body may be formed off-axis from the needle body axis. The tip may also be angled with respect to the needle body. The inner and outer surfaces of the needle tip are roughened, as by sandblasting, to enhance the cutting effect of the tip when used with a non-longitudinal handpiece. The lip of each needle tip is polished to a high degree of smoothness and the edges of the tip are rounded to lessen the incidence of snags or cuts.