Cannula Fixing Device with Expandable Anchoring
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Solution Overview
Problem
During vitrectomy procedures, the infusion port used to maintain intraocular pressure can fall out of the eyeball, leading to pressure release, eyeball shrinkage, and potential damage to the optic nerves and cells.
Innovation Solution
A cannula fixing device with a needle and an expansion part that is selectively expanded to securely attach to the inner wall of the eyeball, preventing the needle from being easily removed or displaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the needle is made short (about 4 mm) to minimize trauma, then the insertion trauma is reduced, but the needle becomes unstable and easily falls out of the eyeball
Solution Approach 1:
The device is divided into three main segments: a needle for insertion, an expansion part for anchoring, and a connection part for fluid delivery. The expansion part is further segmented into multiple expansion portions that can independently expand to engage with the eyeball wall, providing stable fixation without requiring a long needle
Solution Approach 2:
The expansion part transitions from a compressed state during insertion to an expanded state after insertion. This dynamic transformation allows the device to minimize trauma during insertion while providing strong anchoring force after deployment, resolving the contradiction between short needle length and stability
2Reliability
If the needle is made long to prevent falling out, then the needle stability is improved, but the insertion trauma increases and the risk of piercing the retina increases
Solution Approach 1:
The anchoring function is separated from the insertion function. The short needle handles insertion while the separately deployed expansion part provides anchoring, eliminating the need for a long needle that would increase retina piercing risk
Solution Approach 2:
The expansion part is pre-loaded in a compressed state within the needle. After the short needle is safely inserted, the expansion part is deployed to provide anchoring force, achieving stable fixation without exposing the retina to the risks of a long needle
3Reliability
If the needle is fixed securely to prevent falling out, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The expansion part is constructed from a flexible membrane that can be compressed for insertion and then expanded to engage with the eyeball wall. This simple yet effective structure provides secure fixation without complex mechanical components
Solution Approach 2:
The expansion part is inflated using pneumatic pressure delivered through a second tube. This allows the expansion part to transition from a compact insertion state to an expanded anchoring state, providing secure fixation through a simple pressure-driven mechanism rather than complex mechanical assembly
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 effectively prevents the infusion port from falling out, maintaining intraocular pressure and reducing the risk of damage to the eyeball and its structures during surgical procedures.
Implementation Method 1
an expansion part that is selectively expanded from an outer peripheral surface of the needle inserted into the body
Implementation Method 2
The temporary contact area may dissolve when the needle is inserted into the body or separates the needle and the first end by using an expansion pressure of the expansion part
Data Source
AI summary
Disclosed is a cannula fixing device for insertion into a body including a needle having a specific length, and inserted into the body, a connection part connecting a first tube that supplies a solution to the needle, and the needle, and an expansion part that is selectively expanded from an outer peripheral surface of the needle inserted into the body.