Rotary Element Piercing Device Eliminates Needle Biasing Movement
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Solution Overview
Problem
Piercing devices for blood sampling often require complex mechanisms and additional needle movement during the biasing process for a new piercing sequence, leading to increased component complexity, constructional space, and manufacturing costs.
Innovation Solution
A piercing device with a rotary element between the drive unit and needle holding element, allowing for both forward and backward movement of the needle holding element through a rotary movement, eliminating the need for additional needle movement during biasing by using engagement arms and projections that alternate with rotation direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curved path mechanism is used to retract the needle after piercing, then the needle can be retracted back into the base body, but additional needle movement occurs during the biasing process which increases device complexity and manufacturing costs
Solution Approach 1:
The mechanism is segmented into distinct functional components: a drive unit with engagement arms, a rotary element with projections, and a needle holding element. The rotary element acts as an intermediary that converts rotational motion into linear needle movement, separating the biasing function from the needle actuation function. This segmentation allows the needle to remain stationary during biasing while still enabling reliable retraction through the rotary mechanism.
2Stability of the object's composition
If complex mechanisms are used to prevent additional needle movement during biasing, then needle stability is improved, but constructional space and manufacturing costs increase
Solution Approach 1:
The mechanism uses dynamic engagement and disengagement of the rotary element's projections with the drive unit's engagement arms. During biasing, the rotary element can rotate freely without engaging the needle holding element, allowing compact design. During piercing, the engagement arms lock onto the projections to transmit force. This dynamic behavior provides needle stability when needed while maintaining compact constructional space.
3Manufacturing precision
If multiple components are used to control needle movement during biasing, then needle positioning accuracy is improved, but manufacturing costs and device complexity increase
Solution Approach 1:
The rotary element serves multiple functions: it acts as a connection element between the drive unit and needle holding element, converts rotational motion to linear motion, and provides engagement/disengagement mechanisms for controlled needle actuation. The engagement arms and projections work together to provide both positioning accuracy during piercing and freedom of movement during biasing. This multi-functionality reduces the need for separate specialized components, lowering manufacturing costs while maintaining precision.
Data Source
AI summary
The invention relates to a piercing device for taking blood for medical analyses, comprising a base body, comprising at least one needle which is arranged therein and a tip which can be extended, comprising a needle holding element which encloses the needle at least in part and a drive unit for driving a movement of the needle together with the needle holding element with respect to the base body.