Arterial Flashback Chamber with Circuitous Tubing
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Solution Overview
Problem
Conventional vascular access devices often fail to provide sufficient time for operators to confirm proper placement of needles and catheters in arteries due to the short duration of arterial blood flashback, posing risks from high-pressure blood exposure.
Innovation Solution
An arterial flashback confirmation chamber with a circuitous length of tubing and a vent, allowing for prolonged observation of blood flow into a flashback compartment with a large internal volume, enabling operators to verify proper placement without exposing them to high-pressure arterial blood.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional catheter assemblies are used for arterial access, then the operator can observe blood flashback, but the observation period is too short to confirm proper placement safely
Solution Approach 1:
The invention divides the observation function into two separate components: the original catheter assembly and an additional extension tube with a larger flashback chamber. This segmentation allows the blood flashback to be observed over a longer period in the extended chamber without modifying the original catheter design, thereby extending the observation duration while maintaining ease of operation.
Solution Approach 2:
The invention adds a spatial dimension to the observation system by extending the flashback chamber along the length of the extension tube. This dimensional extension provides a longer visual path for blood flashback, allowing operators to observe blood flow for an extended period while the needle and catheter are being placed, thus improving confirmation ease without compromising the original catheter function.
2Volume of stationary object
If the catheter and extension tube have small internal volume, then they fill quickly with arterial blood, but the operator cannot observe blood flow long enough to confirm proper placement
Solution Approach 1:
The invention segments the flashback observation function by adding a separate extension tube with its own flashback chamber. This allows the total observation volume to be increased without modifying the original catheter, providing a larger space for blood to flash back and remain visible for a longer duration, thus extending the observation period while maintaining the original catheter's small volume for quick filling.
Solution Approach 2:
The extension tube with the larger flashback chamber is nested over the original catheter assembly. This nested configuration allows the blood to fill both the original catheter and the extended chamber, effectively increasing the total internal volume available for blood flashback observation. The nesting arrangement ensures that blood flows through both segments, extending the visible flashback duration without compromising the quick-filling特性 of the original small-volume catheter.
3Object-affected harmful factors
If the operator waits for blood to fill the catheter and extension tube, then placement can be confirmed, but the operator is exposed to high-pressure arterial blood
Solution Approach 1:
The extension tube with the larger flashback chamber serves as an intermediary between the high-pressure arterial system and the operator's observation point. This intermediate chamber allows blood to flash back and be observed at a distance from the needle puncture site, reducing the operator's direct exposure to high-pressure arterial blood while maintaining accurate visualization of blood flow for placement confirmation.
Solution Approach 2:
The invention extracts the observation function from the immediate vicinity of the needle puncture site and relocates it to the extended flashback chamber. By taking out the blood flashback observation from the high-pressure zone near the needle and placing it in the extended chamber, the operator can verify placement accuracy while being protected from direct exposure to high-pressure arterial blood.
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
Enables operators to visually confirm proper needle and catheter placement within arteries for a longer period, reducing the risk of high-pressure blood exposure and improving placement accuracy.
Implementation Method 1
The confirmation chamber also comprises a vent that allows air to escape from the confirmation chamber as blood flows into the catheter, the extension tube, and/or the confirmation chamber.
Data Source
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AI summary
The present invention relates to an arterial flashback confirmation chamber. Generally, the confirmation chamber is used with a vascular access device to allow an operator to see active arterial flashback confirmation for a period of time that is long enough to permit the operator to properly place the cannula of the vascular access device within a patient's artery. In some instances, the confirmation chamber comprises a flashback compartment, means for prolonging active arterial flashback confirmation, and a vent. Some examples of suitable prolonging means comprise a flashback compartment with a relatively large internal volume, circuitous tubing, an absorbent material, an orifice and/or tubing with a smaller inner diameter than the inner diameter of the cannula, and the like. Where the vascular access device comprises a catheter assembly, the catheter assembly and confirmation camber are optionally used with a guide wire and/or a blood sensor.