Needle Assembly Holder Cutout Deformation
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Solution Overview
Problem
Medical liquid injection devices, particularly for diabetic patients, face challenges in providing simple and precise operation, especially when attached to the body for extended periods, requiring improved wearability, convenience, durability, and low power consumption, along with easy and accurate needle insertion and sensing mechanisms.
Innovation Solution
A needle assembly with a holder unit, sensors for precise positioning, and a sensing unit that includes a base with compressibility and conductivity, allowing for accurate insertion and withdrawal sensing, and a second holder with cutout parts for deformation and easy passage through ledges, ensuring stable cannula insertion and medical liquid injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the second holder has rigid structure for stable cannula fixation, then fixation stability is improved, but ease of passage through ledges deteriorates
Solution Approach 1:
The second holder is designed with flexible ends that can dynamically deform during the passage through ledges, then return to their original shape to provide stable fixation. This dynamic behavior allows the holder to adapt between insertion phase (deformation) and fixation phase (rigidity).
Solution Approach 2:
The holder's structural parameters (flexibility/rigidity) are changed through the cutout parts that allow controlled deformation. The flexible ends can change their shape and stiffness parameters during operation, being flexible during passage and rigid during fixation.
2Measurement precision
If sensors are added for precise needle positioning, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensing unit utilizes the holder unit's own movement and structural features to detect needle position. The base with compressibility and conductivity detects position changes through mechanical compression during needle insertion, eliminating the need for separate complex sensing mechanisms.
Solution Approach 2:
The base acts as an intermediary element between the needle and the detection system. It converts mechanical needle movement into electrical signals through its compressible and conductive properties, simplifying the overall sensing mechanism.
3Reliability
If the base has compressibility for stable contact, then reliability of sensing is improved, but manufacturing precision requirements increase
Solution Approach 1:
The base's compressibility parameter is intentionally designed to provide self-adjusting contact pressure. This physical property allows the base to adapt to manufacturing variations and maintain reliable contact without requiring extremely tight manufacturing tolerances.
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 solution enables stable and accurate insertion and fixation of the cannula, precise sensing of needle movement, and safe operation, ensuring reliable medical liquid injection by allowing deformation for easy passage and using sensors for accurate positioning and contact with connection parts.
Implementation Method 1
a base having one surface supported by the holder unit and capable of contraction
Implementation Method 2
a contact unit disposed on the other surface of the base and having conductivity
Implementation Method 3
at least one of the first end and the second end has an cutout part with a part removed by a preset length
Data Source
AI summary
A needle assembly and a medical liquid injection device are provided. The needle assembly includes a needle, a cannula into which the needle is inserted, a first holder supporting the needle, a sleeve in which the first holder is disposed in an inner space thereof, and a second holder supporting the cannula, disposed to face one side of the first holder, and having a first end and a second end extending outward, wherein at least one of the first end and the second end has an cutout part with a part removed by a preset length.