Blood Collection Unit With Capillary Port and Plunger Ejection
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Solution Overview
Problem
Conventional cup-shaped blood collectors with large depths often form air layers, disrupting blood collection and preventing accurate collection of the desired amount of blood. Additionally, small blood dropping portions in test devices can hinder smooth blood release onto absorption pads.
Innovation Solution
A unit for collecting and ejecting blood utilizing a capillary phenomenon, featuring a handle, a handling block with a collection port, and a plunger. The handling block collects blood by capillary force, and the plunger, movable along the handle, enters the collection port to push the collected blood out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a cup-shaped blood collector with large depth is used to collect a desired amount of blood, then the collection capacity is improved, but an air layer is formed inside the cup-shaped structure which disrupts blood collection
Solution Approach 1:
The patent extracts the harmful air layer from the blood collection process by using a flat-bottomed collection well instead of a cup-shaped structure. This design prevents air entrapment while maintaining the ability to collect the desired amount of blood, thereby resolving the contradiction between collection capacity and collection accuracy.
Solution Approach 2:
Instead of using a conventional cup-shaped collector that traps air, the patent inverts the approach by using a flat-bottomed collection well. This inversion of the traditional design eliminates the air layer formation problem while preserving blood collection functionality, addressing the reliability issue.
2Device complexity
If a small blood dropping portion is used in the test device, then the device size is reduced, but the blood does not reach the absorption pad resulting in poor blood release
Solution Approach 1:
The patent introduces a plunger as an intermediary mechanism between the collection well and the blood dropping portion. The plunger actively pushes blood through the small opening to the absorption pad, mediating the transfer process and ensuring smooth blood release despite the reduced device size and small blood dropping portion.
Solution Approach 2:
The plunger performs a preliminary action by pre-positioning and pushing the blood toward the absorption pad before natural release can occur. This preliminary mechanical action ensures that blood successfully reaches the absorption pad even through the small blood dropping portion, maintaining ease of operation in a compact device.
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 solution allows for efficient blood collection without air layer restrictions and effective ejection of collected blood, ensuring accurate and smooth transfer to absorption pads.
Implementation Method 1
a collection port formed to pass through the body in a direction from the contact portion to the connection portion and configured to collect blood by a capillary force
Data Source
AI summary
Disclosed herein is a unit for collecting and ejecting blood including: a handle extending along a first central axis; a handling block connected to the handle and disposed to have a second central axis that is offset from the first central axis; and a plunger connected to the handle to be movable along a direction of the first central axis and moving toward the handling block when manipulated, wherein the handling block includes: a body having a connection portion connected to the handle and a contact portion located beneath the connection portion; and a collection port formed to pass through the body in a direction from the contact portion to the connection portion and configured to collect blood by a capillary force, and the plunger moves along the direction of the first central axis when manipulated to enter the collection port and push the blood collected in the collection port out of the collection port.