Indwelling Needle Tip Protector with Movable Blocking Members
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Solution Overview
Problem
Existing indwelling needles face issues with the reliability of needle tip protective parts, which tend to shift, exposing the internal needle tip and increasing manufacturing costs and resistance during operation, compromising operability.
Innovation Solution
The design incorporates a needle tip protector with a first and second portion of different diameters and inwardly movable blocking members that engage to trap the tip portion, ensuring reliable protection and smooth operation by exerting inward pressure on the blocking members when the inner needle is withdrawn.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a needle tip protective part is used to prevent needle tip exposure, then patient safety is improved, but the protective part is prone to shifting position and may fail to cover the needle tip reliably
Solution Approach 1:
The blocking member is designed to be movable rather than fixed. During needle insertion, the blocking member can move outward to allow passage, and during needle withdrawal, it automatically moves inward to trap and secure the needle tip, providing dynamic adaptation to different operational phases
Solution Approach 2:
The blocking member automatically engages with the needle tip through the differential diameter design without requiring external intervention. The larger diameter of the needle tip portion naturally guides the blocking member into position during withdrawal, creating a self-locking mechanism
2Reliability
If a spring member or fixing mechanism is used to secure the protective part, then needle tip coverage reliability is improved, but the number of parts increases and manufacturing cost rises
Solution Approach 1:
The blocking member is integrated directly into the protective part structure as a single piece, eliminating the need for separate spring members or fixing mechanisms. This merging of components reduces part count while maintaining the securing function through the differential diameter design
Solution Approach 2:
The complex spring-based fixing mechanism is extracted and replaced with a simple geometric constraint system using the blocking member's movable design and the needle tip's larger diameter, achieving the same function with fewer parts
3Reliability
If a blocking member is added to trap the needle tip, then needle tip exposure is prevented, but resistance during internal needle withdrawal increases
Solution Approach 1:
The blocking member's movable design allows it to move outward during needle insertion to minimize resistance, then automatically moves inward during withdrawal to trap the needle tip. This dynamic behavior separates the resistance phase from the securing phase
Solution Approach 2:
The blocking member is positioned in advance during needle insertion before withdrawal begins. This preliminary positioning ensures that when withdrawal starts, the blocking member is already in a state to minimize resistance, and automatically transitions to trapping mode as the needle tip emerges
Data Source
AI summary
An indwelling needle is provided which has a simple structure and is capable of securely mounting a needle tip protective tool on the tip portion of an internal needle. The indwelling needle A consists of an external needle 10 including a cannula 11 and a housing 12, an internal needle 20 including a metal needle 21 and a hub 22 and a needle tip protective tool 30. The needle tip protective tool 30 is mounted on the housing 12 with the metal needle 21 inserted into an inner section so that the metal needle 21 can be removed together with the internal needle 20 from the external needle 10. A main body 31 of the needle tip protective tool 30 has a cylindrical shape. Window sections 34a, 34b are provided on opposing circumferential surfaces of the main body 31. On a rear end marginal section of window section 34a, a movable gripped section 32 is provided whose outer section 32b extends toward the outside of the main body 31 and whose end consists of a grip section 32c. The gripped section 32c and the grip section 33c are latchable with each other within main body 31.