Length Adjustable Cannula Screw Thread Mechanism
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Solution Overview
Problem
Conventional medical cannulas require multiple lengths to accommodate varying distances from the outside skin to the medical treatment region, leading to increased operation time and potential incision enlargement due to measurement errors.
Innovation Solution
A length adjustable cannula with a screw-threaded outer support plate that can be adjusted based on distance, allowing a single cannula to be used for different patients without measuring the distance, featuring an inner support plate with a shade-like shape and grooves for stability and a flange to secure a clear view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple cannulas with different lengths are prepared to accommodate varying distances from outside skin to medical treatment region, then the cannula can fit different patients, but the device complexity increases and operation time is lengthened due to measurement and selection requirements
Solution Approach 1:
The outer support plate is designed with a screw thread coupling mechanism that allows it to be adjusted to different positions along the main body. This single cannula structure can accommodate multiple distances from outside skin to medical treatment region, replacing the need for multiple fixed-length cannulas. The universal design enables one cannula to serve multiple patients with different anatomical variations.
Solution Approach 2:
The outer support plate transitions from a fixed position to a movable, adjustable position through the screw thread coupling. This dynamic adjustment capability allows the cannula length to be modified during insertion to match the specific distance required for each patient, eliminating the need to pre-select from multiple fixed-length options.
2Manufacturing precision
If the distance from outside skin to medical treatment region is measured to select the appropriate cannula length, then the correct fit is achieved, but the operation time is increased
Solution Approach 1:
The outer support plate is pre-equipped with a screw thread coupling mechanism that enables easy adjustment to different positions. This preliminary preparation of the adjustment mechanism eliminates the need for time-consuming measurement and selection processes during the actual medical procedure, as the cannula can be quickly adapted to the required length.
3Manufacturing precision
If a cannula is replaced due to measurement error, then the correct length is eventually selected, but the incision portion is enlarged and recovery time is extended
Solution Approach 1:
The adjustable outer support plate allows the cannula to be precisely fitted to the required length without replacement. The screw thread coupling enables fine-tuned adjustment to avoid incision enlargement, eliminating the harmful effect of repeated insertion and replacement operations.
4Adaptability or versatility
If the outer support plate is made movable through screw thread coupling, then the cannula length is adjustable for different patients, but the device complexity increases
Solution Approach 1:
The screw thread coupling mechanism replaces complex adjustment systems with a simple, well-understood mechanical threading system. This substitution provides an elegant solution that achieves length adjustability using a fundamental mechanical principle, avoiding the need for complex motors, actuators, or control systems.
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
Facilitates stable installation and reduces operation time by eliminating the need for multiple cannulas and minimizing incision enlargement, while improving the speed and accuracy of medical treatments by allowing a single cannula to accommodate varying patient anatomies.
Implementation Method 1
a pipe-like main body (21) having a through hole formed therein and an outer circumferential surface on which a screw thread (22) is formed... an outer support plate (25) thread-coupled with the outer circumferential surface of the main body (21), the outer support plate being movable along the screw thread (22) in a lengthwise direction of the main body (21)
Data Source
AI summary
A length adjustable cannula includes: a pipe-like main body having a through hole formed therein and an outer circumferential surface on which a screw thread is formed; a base grip provided at an end of the main body; an inner support plate provided at another end of the main body; and an outer support plate thread-coupled with the outer circumferential surface of the main body, the outer support plate being movable along the screw thread in a lengthwise direction of the main body. A position of the outer support plate is adjusted based on a distance from an outside skin to a medical treatment region of a human body, such that the outer support plate is brought into contact with the outside skin and the inner support plate is brought into contact with and supported by an inside skin of the human body.