Suction Device with Forward Piston for Bodily Fluid Sampling
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Solution Overview
Problem
Current methods for sampling bodily fluids, such as blood, are complex and painful, and existing technologies struggle to efficiently extract small volumes of fluid while maintaining reliable contact with the skin during the sampling process.
Innovation Solution
A suction applying device with a syringe body and movable piston creates a sub-pressure effect by dividing the syringe's interior into two portions, allowing for continuous suction when the piston is moved forward, which simplifies the sampling process and maintains contact with the skin, and can be integrated with a microneedle device for pain-free fluid extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a thin lancing needle is used to minimize skin injury, then pain is reduced and skin damage is minimized, but the amount of blood obtained is insufficient
Solution Approach 1:
The patent applies periodic vibration to the skin at the piercing site to stimulate blood flow and enhance blood extraction. The vibration is applied in a periodic manner to increase the amount of blood obtained while using a thin needle that minimizes skin injury.
Solution Approach 2:
The patent employs a vacuum suction system that creates negative pressure to draw blood through the microneedle. This pneumatic approach allows sufficient blood volume to be extracted through a thin needle by applying suction force to overcome the limited natural blood flow.
2Quantity of substance
If conventional syringes are used for blood sampling, then blood can be extracted, but the procedure is complex and requires multiple handling steps
Solution Approach 1:
The patent integrates the microneedle device, vacuum suction system, and sample collection components into a single unified apparatus. This merging of functions eliminates the need for separate handling of multiple components and simplifies the overall sampling procedure while maintaining effective blood extraction.
Solution Approach 2:
The apparatus is designed to automatically perform multiple functions: the microneedle penetrates the skin, the vacuum system automatically draws blood through capillary action and suction, and the sample is collected in an integrated chamber. This self-service design reduces the need for manual intervention and handling steps.
3Quantity of substance
If the piston is moved backward in a conventional syringe to create suction, then blood can be drawn, but contact with the skin may be lost during the movement
Solution Approach 1:
Instead of moving the piston backward to create suction as in conventional syringes, this patent moves the piston forward to generate positive pressure that pushes blood toward the collection chamber. This inverted approach maintains consistent contact between the apparatus and the skin throughout the sampling process.
Solution Approach 2:
The patent uses a vacuum suction system that creates negative pressure in the collection chamber, which actively draws blood through the microneedle. This pneumatic mechanism maintains reliable skin contact because the suction force pulls the needle against the skin rather than requiring backward piston movement that could break contact.
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 provides a reliable, simple, and safe method for sampling bodily fluids by ensuring continuous suction and minimizing discomfort, while allowing for immediate skin penetration and fluid extraction in a single movement, reducing the risk of needle displacement and requiring fewer handling steps.
Implementation Method 1
a first conduit (40) having a rear opening (41) connecting the first conduit (40) to a rear portion (14b) of the hollow interior (14), in which rear portion a sub-pressure is created when the piston (20) is moved forward inside the hollow interior (14)
Implementation Method 2
a suction applying device (10) for applying suction to a sampling unit (50) for sampling bodily fluid
Data Source
AI summary
A suction applying device (10) for applying suction to a sampling unit (50) for sampling bodily fluid, wherein the suction applying device comprises a syringe body (12) with a hollow interior (14) and a piston (20) movable inside the hollow interior of the syringe body. The syringe body has a rear end (16) through which a piston rod (21) connected to the piston extends outside of the syringe body and by means of which the piston can be moved, and a front end (18) opposite the rear end. The suction applying device further comprises a connection arrangement (130) configured for connection of a sampling unit, wherein the connection arrangement is located at the front end of the syringe body. The suction applying device also comprises a first conduit (40) having a rear opening (41) connecting the first conduit to a rear portion (14b) of the hollow interior, in which rear portion a sub-pressure is created when the piston is moved forward inside the hollow interior, and a front opening (42) by means of which the first conduit is connectable to a sampling unit. The suction applying device also comprises a second conduit (46) that connects a front portion (14a) of the hollow interior with the exterior of the syringe body, and which front portion is located between the piston and the front end of the syringe body. Also disclosed is an apparatus for sampling bodily fluid, comprising a suction applying device and a sampling unit, as well as a method for detecting a component in a bodily fluid.