Bottom control type specimen filtering container and filtering method thereof

• US 8,268,171 B2
• Filed: 04/28/2010
• Issued: 09/18/2012
• Est. Priority Date: 04/28/2009
• Status: Active Grant

• Current Assignee: Qinghua Liao
• Original Assignee: Qinghua Liao
• Inventors: Liao, Qinghua
• Primary Examiner(s): POPOVICS, ROBERT J
• Application Number:
  US13/264,954
• Publication Number:
  US 20120037563A1
• Time in Patent Office: 874 Days
• Field of Search: None
• US Class Current: 210/233
• CPC Class Codes: A61B 10/0038 Devices for taking faeces samples; Faecal examination devices anal receptacles A61F5/451
• CPC Class Codes: A61B 10/0096 Casings for storing test samples A61B10/0038 and A61B10/0045 take precedence; preservation of living parts of the human or animal body A01N1/02; containers for retaining a material to be analysed B01L3/50; containers for enzymology or microbiology C12M1/16; swab-sampler being part of enzymology or microbiology container C12M1/30
• CPC Class Codes: B01L 2300/0681 Filter
• CPC Class Codes: B01L 2400/0633 with moving parts
• CPC Class Codes: B01L 3/502 with fluid transport, e.g. in multi-compartment structures centrifugal-type cuvettes G01N21/07; analysis by separation into components G01N30/00; automatic analysers G01N35/00
• CPC Class Codes: B01L 3/5029 using swabs
• CPC Class Codes: B01L 3/5082 Test tubes per se
• CPC Class Codes: C12Q 1/24 Methods of sampling, or inoculating or spreading a sample; Methods of physically isolating an intact microorganisms
• CPC Class Codes: G01N 2001/4088 filtration

Abstract

A bottom control type specimen filtering container consists of a seal plug (1), a top cap (2), a cylinder body (3), a piston rod (5), pistons (6), a clutch spring (7), a drainage needle (8) and a bottom cap (9). The piston rod (5) is disposed in a central hole (12) at the bottom of the cylinder body (3). The pistons (6) are tightly sleeved on the projections of the piston rod (5). The drainage needle (8) is fixedly connected to the lower end of the piston rod (5) through screw thread. One end of the clutch spring (7) is pressed against the bottom of the cylinder body (3), and the other end is against a flange of the drainage needle (8). Furthermore, a double-layer filtering system composed of a first layer of filter screen (4) and a second layer of filter screen (11) is arranged in the specimen filtering container. The shaft of the first layer of filter screen (4) penetrates through a middle hole of the second layer of filter screen (11) and is fixed in a hole at the top of the piston rod (5). A filtering method comprises the following steps: charging a solution to be filtered into the cylinder body (3); removing the bottom cap (9), and disposing a receiving container below the drainage needle (8); and pushing up the receiving container so as to open the bottom of the cylinder body (3) and discharge the solution from the bottom of the cylinder body (3) to the receiving container.

Claims

1. A bottom control specimen filtering apparatus comprising:

a container comprising;

a cylinder body having a specimen receiving chamber in an upper portion thereof;

a top cap having an orifice therein;

a seal plug received in, and sealing said orifice; and

a bottom cap;

a piston rod disposed in a central hole at a lower end of the cylinder body;

pistons tightly sleeved on projections of the piston rod and engaging the sidewall of said central hole;

a drainage needle fixedly connected to a lower end of the piston rod by a screw thread;

a clutch spring, an upper end of which is pressed against a portion of the cylinder body and a lower end of which is pressed against a flange of the drainage needle; and

a double-layer filtering system composed of a first layer of filter screen and a second layer of filter screen, wherein a shaft of the first layer of filter screen penetrates through a middle hole of the second layer of filter screen and is fixed in a hole at the top of the piston rod, an upper surface of said first layer defining a lower end of said specimen receiving chamber.

2. The bottom control specimen filtering apparatus of claim 1, further comprising a sampler mounted within said cylinder body and in fluid communication with said orifice in said top cap.

3. The bottom control specimen filtering apparatus of claim 1, wherein a clearance exists between a lower end surface of the first layer of filter screen and an upper end surface of the pistons, and a height of the clearance is greater than a thickness of the second layer of filter screen.

4. The bottom control specimen filtering apparatus of claim 1, wherein said central hole is defined by an integral projection of said cylinder body.

5. The bottom control specimen filtering apparatus of claim 4, wherein said clutch spring is located in an annular region between a wall of said cylindrical body and said integral projection.