Pivoting Cannula Insertion Mechanism for Precise Needle Retraction
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Solution Overview
Problem
Conventional on-body injectors lack a simple structure, compact size, easy operation, and precise insertion and retraction functions.
Innovation Solution
A medical insertion mechanism with a base, needle holder, cannula holder, pivoting assembly, lever, triggering component, and driving component, allowing for a compact design and precise insertion and retraction of a needle and cannula through a sliding and pivoting mechanism actuated by a spring-driven pivoting assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional on-body injectors are designed with multiple separate components for insertion and retraction, then the insertion and retraction function can be achieved, but the device complexity and size increase
Solution Approach 1:
The patent combines the needle holder and cannula holder into a single integrated assembly that moves together during insertion. The needle and cannula are positioned in the same holder, allowing simultaneous advancement through the skin while reducing the number of separate moving components that would otherwise require individual control mechanisms.
Solution Approach 2:
The holder assembly serves multiple functions: it holds both the needle and cannula, provides the pushing structure for advancement, and acts as the retraction mechanism when pulled back. This multi-functional design eliminates the need for separate insertion and retraction mechanisms, simplifying the overall device structure.
2Reliability
If conventional on-body injectors use multiple separate components, then insertion and retraction can be performed, but the device size increases
Solution Approach 1:
The needle is positioned inside or alongside the cannula within the same holder, with both components nested in the same spatial envelope. The holder itself is compact, accommodating both the needle and cannula in a space-efficient arrangement that minimizes the overall device volume while maintaining full insertion and retraction functionality.
3Reliability
If conventional on-body injectors have complex structures, then insertion and retraction functions can be achieved, but ease of operation decreases
Solution Approach 1:
The holder assembly automatically performs both insertion and retraction functions through a single pulling motion. When the user pulls the holder back, the pushing structure automatically retracts both the needle and cannula together, and the entire assembly can be removed as one unit. This self-service mechanism eliminates the need for complex multi-step operations or separate control mechanisms for each component.
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
Enables easy operation with precise insertion and retraction of medical devices for drug injection or fluid drainage, achieving a compact size and reduced part count.
Implementation Method 1
The driving component is a spring at least partially sleeved on the column component
Data Source
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AI summary
A medical insertion mechanism(11) is provided and includes a base(111,111'), a needle holder(114) slidably disposed on the base(111,111'), a needle(115) disposed on the needle holder(114), a cannula holder(112,112') arranged at a position corresponding to the needle holder(114) and at least partially disposed inside the needle(115), a cannula(113) disposed on the cannula holder(112,112'), a pivoting assembly(116) pivotally disposed on the base(111,111'), a lever(117) movably disposed on the base(111,111') and movably engaged with the pivoting assembly(116), an actuator(118) disposed on the base(111,111'), and a driving component(119) for driving the pivoting assembly(116) to pivot when the actuator(118) slides to disengage from the pivoting assembly(116). When the pivoting assembly(116) pivots, the lever(117) drives the needle holder(114) to slide along an insertion direction(D1) and then along a retraction direction(D2), so as to insert the cannula(113) into the patient's body. Besides, a medical device having the aforementioned medical insertion mechanism(11) is also provided.