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A flow system and a micro fluidic system comprising a flow system

A technology of microfluidic system and flow system, applied in the field of flow system, can solve problems such as inappropriate moving mechanical parts

Inactive Publication Date: 2009-01-14
CEQUR SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, this system is not easy to implement in a microfluidic system because moving mechanisms such as adjustable needles are not suitable here

Method used

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  • A flow system and a micro fluidic system comprising a flow system
  • A flow system and a micro fluidic system comprising a flow system
  • A flow system and a micro fluidic system comprising a flow system

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Embodiment Construction

[0042] Figure 1 is a cross-sectional view of a flow system 1 according to one embodiment of the present invention. The flow system 1 of FIG. 1 comprises a first part 2 and a second part 3 . The first part 2 is located in a recess of the second part 3 so that the second part 3 abuts against the first part 2 along three sides of the cross section. A flow channel 4 is formed inside the first part 2 . Furthermore, corresponding to the position of the flow channel 4, an additional flow channel 5 is formed.

[0043] The material from which the first part 2 is made has a greater coefficient of thermal expansion than the material from which the second part 3 is made. Therefore, when the ambient temperature rises and the second part 3 is not installed, the first part 2 will expand more than the second part 3 . The difference between the two coefficients of thermal expansion can be chosen such that the thermal expansion of the second part is negligible compared to the thermal expansi...

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Abstract

A flow system (1) comprising a first part (2) and a second part (3), the parts (2, 3) being made from materials having different coefficients of thermal expansion. The first (2) and second (3) parts are positioned relatively to each other in such a way that when the ambient temperature changes corresponding changes are caused in a flow channel (4) formed in the first part (2), thereby changing the flow resistance of the flow channel (4). Thereby a change in flow resistance caused by a change in viscosity of a fluid being transported by the flow system (1) can be counteracted. The resulting flow resistance of the flow system (1) is thereby at least substantially independent of the ambient temperature. Furthermore, a micro fluidic system comprises the flow system (1). The micro fluidic system may be or form part of a medical device, a fluid analysis system, e.g. a device for measuring blood glucose levels of blood samples, or an infusion device.

Description

technical field [0001] The present invention relates to a flow system and in particular to its use in a microfluidic system. The flow resistance of the flow system of the present invention exhibits a lower temperature sensitivity than the flow resistance of the prior art. Background technique [0002] Flow systems, especially flow systems with flow restrictors, can be used for precise control of flow rates in fluid systems, especially microfluidic systems. For example, this can be achieved using a constant pressure pump. The resistance to flow of a flow system is linearly dependent on the viscosity of the fluid conveyed within the flow system. However, the change in viscosity of a fluid is significantly affected by temperature. For example, when the temperature increases from 20°C to 30°C, the viscosity of water decreases by an average of 2.3% per degree (°C). Furthermore, this variation is generally non-linear and thus difficult to adjust or compensate for. The flow re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D7/01F16K31/00
CPCY10T137/2224F16K31/002F16K99/0026F16K2099/0086Y10T137/206F16K99/0036G05D7/0186F16K99/0001Y10T137/1963F16K99/0061F16K2099/0084
Inventor H·迪拉克P·格拉夫森K·O·施韦茨
Owner CEQUR SA