Tension Spring Puncture Device with Lever Control
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Solution Overview
Problem
Conventional puncture devices using two compression springs face challenges in precision, pain during use due to unwanted needle punctures, and safety issues related to reuse of puncture needles, along with difficulties in safe disposal of used needles.
Innovation Solution
A puncture device employing a single tension spring with a rotatable lever and lock plate mechanism for controlled needle insertion and withdrawal, combined with a puncture needle cartridge design that prevents multiple uses and ensures safe disposal through an injection mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two compression springs are used for puncture and withdrawal, then the puncture device can perform both operations, but it is difficult to secure precision of the total length of the first compression spring and requires accurate polishing of both ends
Solution Approach 1:
The invention extracts the precision-critical components (compression springs requiring accurate polishing) from the system and replaces them with a tension spring mechanism where the plunger's natural position is determined by the length of the lever and position of the fulcrum, which are easier to manufacture with precision
Solution Approach 2:
The invention inverts the spring mechanism from compression springs to a tension spring with a lever system. Instead of using compression springs that require precise length control, it uses a tension spring where the plunger position is determined by the lever geometry, reversing the approach to achieve precision
2Reliability
If two compression springs are used as urging means, then the plunger can be moved for puncture and withdrawal, but reciprocation of the plunger due to the compression springs causes the needle to puncture the skin several times, increasing patient pain
Solution Approach 1:
The invention removes the problematic compression springs that cause reciprocation and replaces them with a tension spring system. The tension spring, combined with the lever and fulcrum mechanism, provides controlled unidirectional movement of the plunger, eliminating the harmful reciprocation that causes multiple punctures
Solution Approach 2:
The invention introduces a lever as an intermediary between the tension spring and the plunger. This lever acts as a mediator that converts the linear tension spring force into controlled rotational and linear motion of the plunger, preventing unwanted reciprocation while maintaining reliable puncture and withdrawal operations
3Adaptability or versatility
If a puncture needle cartridge is designed to allow reuse, then the lancet body can be inserted and withdrawn multiple times, but this creates safety issues related to infection and needle reuse
Solution Approach 1:
The invention implements a system where the puncture needle cartridge is designed for single use and then discarded. The safety features prevent reuse by making reattachment impossible, ensuring that used needles are discarded rather than recovered and reused, thereby eliminating infection risks
Solution Approach 2:
The invention employs a disposable puncture needle cartridge design where the entire cartridge including the lancet body is intended for single use only. After one puncture operation, the cartridge is discarded, eliminating the need for complex sterilization and reuse prevention mechanisms while ensuring patient safety
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 simplifies the fabrication process, reduces patient discomfort by controlling puncture speed, prevents multiple needle punctures, and ensures safe disposal of used needles, enhancing safety by preventing needle reuse and exposure.
Implementation Method 1
a tension spring (4) which stores a urging force when it is extended in a direction opposite to an axial direction of the puncture device (101), and urges the plunger (2) in the forward and backward directions by a restorative force that occurs due to retraction of the tension spring (4) in its axial direction
Data Source
AI summary
A puncture device is constituted such that a plunger (2) is provided with a lever (3) which is partially restricted in rotation, and a forward urging force is obtained by a contraction restorative force of a tension spring (4), and the tension spring (4) is again expanded with the lever (3) as a leverage when the plunger (2) further moves forward due to its inertia from a position where no urging force is not applied, and the plunger (2) is urged backward by a restorative force of the re-expansion. Further, a puncture needle cartridge is provided with a lancet body (203) having a puncture needle, and a puncture needle holder (201) in which the lancet body (203) is movably stored, and further, the lancet body (203) has an arm means (302) and the puncture needle holder (201) contains a to-be-latched means (303) that cooperates with the arm means (302). Thereby, the fabrication process is simplified, and plural times of punctures of the puncture needle is prevented, and further, the puncture speed is controlled, and moreover, the used puncture needle is discarded safely.