MICRO PUMP DEVICE

• US 20090220387A1
• Filed: 05/19/2009
• Published: 09/03/2009
• Est. Priority Date: 11/14/2003
• Status: Abandoned Application

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: CHEN, Ming-Fong, GUU, Yeou-Bin, WU, Jinn-Fa
• Application Number:
  US12/468,236
• Publication Number:
  US 20090220387A1
• Time in Patent Office: Days
• US Class Current: 422/100
• CPC Class Codes: B01L 2400/0439 ultrasonic vibrations, vibrating piezo elements
• CPC Class Codes: B01L 2400/0481 squeezing of channels or chambers
• CPC Class Codes: B01L 3/021 Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
• CPC Class Codes: B01L 3/0241 Drop counters; Drop formers making arrays for combinatorial libraries B01J19/0046; automation of dispensing for analysis G01N35/10
• CPC Class Codes: C12M 35/00 Means for application of stress for stimulating the growth of microorganisms or the generation of fermentation or metabolic products; Means for electroporation or cell fusion machines for extracting juice from animal or plant tissue by electroplasmolysis A23N1/006, processes employing electric or wave energy B01J19/08; treatment of microorganisms or enzymes with electrical or wave energy C12N13/00; methods for cell fusion C12N15/02; introduction of foreign genetic material C12N15/87
• CPC Class Codes: F04B 43/046 with piezoelectric drive

Abstract

A micro pump device comprises a structure of chamber with centrally symmetric crossection, a needle compression unit and a traditional fluid extraction and injection unit. The needle compression unit combines with the chamber. The symmetric crossection is utilized to generate fine change in volume for fluid withdraw or discharge. It can be applied as a basic element to products requiring fine fluid withdraw and discharge resolution.

Claims

1. A micro pump device, comprising:

a fluid extraction and injection unit, the fluid extraction and injection unit including an injection syringe tube and a piston, the injection syringe tube having a first open end ,and a second end directly coupled to a micro-needle, the piston moved closely inside injection syringe tube at the first open end of the injection syringe tube;

the micro-needle coupled to the injection syringe tube, the micro-needle having a first fluid opening and a second fluid opening, the first fluid opening of the micro-needle directly coupled with the second end of the injection syringe tube, the micro-needle generally defined by a bi-axially symmetrical tube forming a structural chamber with centrally symmetric cross-sectional portions; and

a compression tube wall unit proximate the periphery of the micro-needle, the compression tube wall unit defined by a ring type piezoelectric actuator, wherein the compression tube wall unit is actuated to compress the tube wall leading to a decrease in volume in the structural chamber of micro-needle and the resolution of volume change is between 10 pl and 4.2×

10-9 pl.

2. The micro pump device of claim 1 wherein the centrally symmetrical cross-sectional portions are circular or rectangular when not compressed.

3. The micro pump device of claim 1, further comprising:

an electric signal input device connected to the compression tube wall unit for driving compression by providing an electric signal.

4. The micro pump device of claim 1 wherein the micro-needle is glass, silicon or metal.

5. The micro pump device of claim 1 wherein the compression of the tube wall produces a resolution for fluid withdraw and discharge finer than 10 nm.