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Diaphragm check valves and methods of manufacture thereof

A technology of check valve and diaphragm, applied in the field of check valve and its manufacture, which can solve the problems of pump leakage, damage, valve failure, etc.

Active Publication Date: 2016-08-17
MINIPUMPS +7
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If an obstruction occurs in the valve, the valve may malfunction with mild symptoms such as irregular flow behavior, or behavior representing a more serious impairment, such as accidental overdose caused by sudden opening of the valve, Failure to administer drug or pump leak caused by overpressure of drug reservoir

Method used

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  • Diaphragm check valves and methods of manufacture thereof
  • Diaphragm check valves and methods of manufacture thereof
  • Diaphragm check valves and methods of manufacture thereof

Examples

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Embodiment Construction

[0041] 1. Valve performance characteristics

[0042] The present invention relates to a one-way check valve that achieves excellent performance characteristics in various embodiments. Parameters often used to limit the performance of check valves such as figure 1 as shown, figure 1 Plot the ideal flow / pressure curve for a normally closed check valve. When pumping starts and the pressure increases from zero to positive (ie the pressure has a negative slope in the direction of the desired flow), the valve remains closed, ie the flow remains at zero (segment 102 ) until the cracking pressure 104 is reached. Once the cracking pressure 104 is exceeded, the flow rate increases with increasing pressure (curve segment 106). But in a pump system using a feedback loop, the steady state working pressure 108 and corresponding working flow 110 remains in effect once achieved. When the pump is turned off (which typically occurs after the target delivery amount has been dispensed), the...

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Abstract

Microscale valves for use in, e.g., micropump devices, may be formed of a slitted diaphragm bonded to the interior of a valve tube. A bump in the diaphragm and / or a backward-leakage stopper may increase the breakdown pressure of the valve. A push-rod may be used to pre- load the valve membrane to thereby increase the cracking pressure.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and the benefit of US Serial Nos. 61 / 751,645, filed January 11, 2013, and 61 / 806,213, filed March 28, 2013, which are incorporated herein by reference in their entirety. technical field [0003] The present invention relates to check valves and methods of making the same, and in particular to microvalves for use, for example, in microfluidic devices such as small implantable drug delivery devices. Background technique [0004] The demand for smaller pump devices continues to grow, especially in the field of medical micro-devices. As a result, the demand for smaller and smaller operating pump components such as check valves is also growing, challenging the limits of traditional manufacturing processes. The smallest check valves commonly available have dimensions in the range of 2-10 millimeters (mm), which are too large for convenient integration into the desired implantable micropumps...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K99/00B29C70/76F16K15/14B29L31/00B29C39/10B29C41/20
CPCB29C39/10B29C41/20B29C45/14598B29C70/766B29L2031/753B29L2031/756F16K15/144F16K15/145F16K15/147F16K99/0057F16K2099/0078Y10T137/0497
Inventor 宇-宗·苔李柏颖富康·江庞长林娜塔莎·伊薇特·宝邑邹敏婷阿图莎·卢特菲
Owner MINIPUMPS