Blood Collection Clamp State Control Mechanism
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Solution Overview
Problem
The existing blood collecting devices face challenges in accurately transitioning between states of the three-way cock, leading to contamination and inefficiency in blood collection, as it is difficult to determine the correct state, resulting in potential mixing of anticoagulant with initially flowing out blood and risk of bacterial contamination.
Innovation Solution
A clamp is introduced in the blood collecting device that includes a first tube connected to a blood collecting needle and bag, a second tube branched from the first tube, and a block-off member, with a mechanism to change states between allowing and preventing the tearing of the block-off member, ensuring the second tube is closed before the first tube is opened, thereby preventing contamination and ensuring accurate blood collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a three-way cock is used to control blood flow paths, then blood collection can be performed in multiple states (initial flow collection, real blood collection, and completion), but it becomes difficult to determine the current state, leading to operational errors and contamination
Solution Approach 1:
The patent uses color-coded identification marks on the clamp body to indicate different operational states. The clamp has visual markers that show whether it is in the initial flow collection state, real blood collection state, or completion state, making it easy to identify the current state without confusion.
Solution Approach 2:
The patent introduces a clamp as an intermediary device between the three-way cock and the operator. This clamp acts as a mechanical mediator that physically prevents incorrect operations by blocking access to the three-way cock until the proper sequence is followed, thereby eliminating state identification errors.
2Reliability
If the upstream side of the blood collecting tube is discontinued to the branched tube before real blood collection, then initial flow blood can be collected, but the first tube may be opened prematurely, causing anticoagulant mixing and contamination
Solution Approach 1:
The patent applies preliminary anti-action by designing the clamp to physically block the first tube from being opened before the second tube is closed. The clamp's structure prevents the tearing or opening of the first tube's block-off member until the second tube is properly sealed, thereby preemptively preventing contamination before it can occur.
Solution Approach 2:
The patent requires that the second tube be closed first as a preliminary action before the first tube can be opened. This sequential requirement ensures that the blood flow path is properly controlled and that no contamination can occur during the transition between collection phases.
3Reliability
If the clamp prevents tearing operation to the block-off member, then the first tube remains blocked, but without the clamp, the block-off member cannot be torn to open the first tube for real blood collection
Solution Approach 1:
The patent makes the clamp's preventing function dynamic rather than static. The clamp can be moved or adjusted to either prevent or allow the tearing operation depending on the operational phase. This dynamic capability enables the system to maintain reliability during critical transitions while allowing necessary operations when proper procedures are followed.
Data Source
AI summary
A clamp is provided in a blood collecting device that includes a first tube having one end and another end connected to a blood collecting needle and a blood bag, respectively, a second tube branched from a halfway of the first tube through a branched portion, and a block-off member which is provided in the first tube at the blood-bag side beyond the branched portion and which allows the first tube in a blocked state to be opened when torn, in which the clamp is arranged at the branched portion, and is configured to change a state between a first state in which the second tube is opened and a tearing operation of the block-off member is disabled and a second state in which the second tube is closed and a tearing operation to the block-off member is enabled.