Height Adjustable Blood Collection Device for Vasovagal Reaction Prevention
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Solution Overview
Problem
Current blood collection devices often cause hypotensive events such as vasovagal reactions during blood donation due to fixed blood flow rates, which can lead to adverse reactions like dizziness, sweating, and loss of consciousness.
Innovation Solution
A height adjustable blood collection device that starts with a slow flow rate and gradually increases it throughout the donation process, reducing the likelihood of vasovagal reactions by allowing the donor's body to adapt to the blood depletion rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fast blood flowrate is used during donation, then the donation time is reduced, but the likelihood of vasovagal reactions increases
Solution Approach 1:
The blood collection device dynamically adjusts the collection bag height during the donation process. The bag starts at a higher position to create slow initial flow, then progressively lowers to increase flowrate. This dynamic position change allows the system to optimize both donor safety (slow initial flow) and efficiency (faster later flow), resolving the contradiction between donation speed and vasovagal reaction prevention.
Solution Approach 2:
The system changes the gravitational parameter (height difference between donor arm and collection bag) during operation. By adjusting the collection bag height from initial high position to lower positions, the gravitational force driving blood flow is modified. This parameter change enables transition from slow to fast flowrate, simultaneously reducing vasovagal reactions while maintaining efficient donation.
2Object-affected harmful factors
If a slow initial blood flowrate is used, then vasovagal reactions are reduced, but the donation time increases
Solution Approach 1:
The blood collection process is divided into periodic phases with different flowrates. The donation starts with a slow flowrate phase to prevent vasovagal reactions, then transitions to a faster flowrate phase to complete the collection efficiently. This periodic variation in flowrate allows the system to address both safety concerns and time efficiency throughout the donation process.
Solution Approach 2:
The collection bag height is dynamically adjusted during donation, creating different flow conditions at different time points. The system transitions from a high-position bag (slow flow) to a lower-position bag (fast flow), enabling the donation to progress through different speed phases. This dynamic approach minimizes total donation time while preventing adverse reactions.
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 device effectively reduces the occurrence of hypotensive events by controlling blood flow rate, allowing for a safer and more efficient blood donation process.
Implementation Method 1
Flow rate from the donor to the collection bag is determined simply by the difference in height between the donor's arm and the collection bag resting on the collection device
Data Source
AI summary
A system for altering blood flowrate during donation comprising a height adjustable blood collection assembly including: a base, a tower extending upward from the base, an actuator and a carrier; the actuator is coupled to the carrier and the tower, and the actuator vertically adjusts the carrier relative to the base; a receptacle being connected to the carrier and configured to receive a blood collection container; and a controller that interacts with at least the actuator.