Sutureless Intrasclear Haptic-Hook Lens Implantation

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Solution Overview

Problem

Intrascleral fixation methods for intraocular lens implantation face complications such as complexity in operation, difficulty in controlling tunnel length and depth, risk of scleral flap fracture, and potential for haptic slippage leading to lens offset or dislocation.

Innovation Solution

A sutureless intrascleral haptic-hook lens implantation method involving lateral corneal and conjunctival incisions, puncture channels, and a lamellar scleral incision to create a groove for haptic fixation, allowing the haptic to be bent and folded back into the vitreous chamber for enhanced stability, using a C-shaped polyvinylidene fluoride haptic.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If intrascleral fixation method is used, then lens fixation stability is improved, but operation complexity increases

Engineering Contradiction:

Improvelens fixation stabilityVSAvoidoperation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The haptic is divided into functional segments: a hooked end portion for engagement with the scleral groove and a body portion for lens support. This segmentation allows the haptic to achieve stable fixation through its specialized hooked geometry while simplifying the surgical procedure by eliminating the need for sutures or complex tunneling.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of passing the haptic through the sclera from the anterior chamber side (conventional approach), this invention hooks the haptic from the vitreous chamber side and engages it with a scleral groove. This inverted approach simplifies the surgical steps and improves fixation stability by creating a mechanical interlock between the hooked haptic and the scleral groove.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If traditional intrascleral tunnel method is used, then lens fixation is achieved, but difficulty in controlling tunnel length and depth increases

Engineering Contradiction:

Improvelens fixationVSAvoidtunnel length and depth control

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The invention extracts the haptic from the conventional intrascleral tunneling process and replaces it with a hooked configuration that engages with the sclera from the vitreous chamber side. This eliminates the need to create and control intrascleral tunnels, thereby removing the difficulty of measuring and controlling tunnel dimensions while maintaining secure lens fixation.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If scleral flap method is used, then lens haptic fixation is achieved, but risk of scleral flap fracture increases

Engineering Contradiction:

Improvehaptic fixationVSAvoidscleral flap fracture risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Rather than creating a scleral flap and passing the haptic through it (which risks flap fracture), this invention inverts the approach by creating a groove in the sclera and engaging the hooked haptic from the vitreous chamber side. This eliminates the need for scleral flaps entirely, removing the associated fracture risk while maintaining secure haptic fixation.

Inventive Principle:

Principle #13The other way round (Inversion)

4Ease of operation

If haptic is left exposed outside sclera, then fixation is simplified, but possibility of haptic slippage and lens offset increases

Engineering Contradiction:

Improvefixation simplicityVSAvoidlens position stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The haptic is designed with a curved hooked geometry that complements the scleral groove configuration. The hooked end portion of the haptic fits into the scleral groove like a key in a lock, creating a mechanical interlock that prevents slippage. This curved design maintains fixation simplicity while ensuring lens position stability by eliminating haptic exposure.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentUS10932900B2Method of sutureless intrascleral haptic-hook lens implantation

Publication Date: 2021.03.02 THE EYE HOSPITAL OF WENZHOU MEDICAL UNIVERSITY

AI summary

A method of sutureless intrascleral haptic-hook lens implantation which improves the fixation process of the lens haptics, allowing the lens haptics to be bent and folded back into the vitreous cavity to generate a better stability, avoiding the complication of intrascleral fixation haptic slippage, meanwhile forming a sclera lamellar groove between two adjacent scleral incisions to bury the lens haptics. The method may be adapted to patients in need of intraocular lens implantation without sufficient capsular support, such as aphakia, intraocular lens, lens dislocation, etc. This method enhances the stability and centrality of the lens, the surgical procedures are simple and easy to master, which reduces the operation time.