Puncture Needle Cartridge Spiral Guide Mechanism
Solution Overview
Problem
Conventional puncture needle cartridges face issues with proper attachment to puncture instruments due to malfunctioning turning mechanisms, which can prevent the breakable component from being broken, leading to improper attachment and operation.
Innovation Solution
The puncture needle cartridge features a columnar lancet body with a tubular lancet case, guide protrusions, and sliding protrusions, along with a rotational force mechanism that breaks the breakable component when attached to the puncture instrument, ensuring proper operation and attachment by restricting sliding with stoppers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a turning mechanism is provided to the puncture instrument to turn the lancet body, then the breakable component can be broken, but the turning mechanism may not operate properly depending on the attachment state, leading to unreliable breakage
Solution Approach 1:
Instead of providing a turning mechanism in the puncture instrument that turns the lancet body, the invention inverts the approach by providing a turning mechanism directly in the puncture needle cartridge that turns the lancet case. This self-contained turning mechanism ensures reliable operation regardless of attachment state, while the attachment process itself activates the mechanism through relative movement between the lancet case and lancet body.
Solution Approach 2:
The puncture needle cartridge is designed to be self-sufficient with its own turning mechanism. The lancet case includes spiral guide components that automatically generate rotational force when there is relative movement between the lancet case and lancet body during attachment. This eliminates the need for an external turning mechanism in the puncture instrument, making the system self-service and more reliable.
2Reliability
If the lancet case is allowed to slide freely during attachment, then the turning mechanism can be activated, but the lancet case may slide in the wrong direction or excessive distance, preventing proper breakage
Solution Approach 1:
The stoppers are pre-positioned on the lancet case at locations that automatically restrict sliding to the correct方向和距离when the lancet case moves relative to the lancet body during attachment. This preliminary positioning ensures the turning mechanism is activated with the precise movement needed to break the breakable component, without requiring complex real-time control mechanisms.
Solution Approach 2:
The stoppers provide localized constraint at specific positions on the lancet case, allowing free sliding in the correct direction while restricting movement in the wrong direction. This localized quality approach maintains simplicity by only constraining movement where necessary, rather than requiring complex overall restraint mechanisms.
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
This design ensures the breakable component is reliably broken and the cartridge is properly attached to the instrument, enhancing operational efficiency and reliability.
Implementation Method 1
The lancet case has spiral guide components formed from the side of the first end toward the side of the second end, for imparting a rotational force in a specific direction to the lancet case when there is relative movement in the puncture direction
Implementation Method 2
guide protrusions that are provided to the outer peripheral face of the puncture needle cover on the side of the first end of the breakable component; and sliding protrusions that are provided closer to the side of the second end than the breakable component
Implementation Method 3
The puncture needle cover further has stoppers that restrict sliding to the side of the second end from a state in which the lancet case is mounted to the middle section
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A puncture needle cartridge (4) is provided with a lancet body (5) and a lancet case (6). The lancet body (5) has a puncture needle (10); a connector (7) that is provided on a second end side and is connected to puncture instrument (1); a puncture needle cover (8) that covers the tip portion of the puncture needle (10) before use; a breakable component (9) that is broken when performing puncturing, thereby separating the puncture needle cover (8) and exposing the tip portion of the puncture needle (10); guide protrusions (12) that are provided to the outer peripheral face of the puncture needle cover (8) on a first end side of the breakable component (9); and sliding protrusions (13) that are provided closer to the second end side than the breakable component (9). The lancet case (6) has a spiral guide (14) that imparts to the lancet case (6) a rotational force acting in a specific direction when there is relative movement in the puncture direction in a state in which the guide protrusions (12) are engaged; and a sliding groove (15) that guides movement in the puncture direction in a state in which the sliding protrusions (13) are engaged. The lancet case (6) is mounted to the outer periphery of the middle section of the lancet body (5) in a state in which the breakable component (9) has not been broken. The puncture needle cover (8) further has stoppers (33) that restrict the sliding of the lancet case (6) to the second end side from a state in which the lancet case (6) is mounted to the middle section.