Title:
DRUG SOLUTION DISPENSING DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/005015
Kind Code:
A1
Abstract:
Disclosed is a drug solution dispensing device (10a) that ejects a drug solution by forcing a pump chamber (16), which is linked to a drug solution inlet (21) and a drug solution outlet (22), to expand and contract, said drug solution dispensing device (10a) having a cylinder (12) containing a piston (31) that is able to reciprocate in the axial direction. A bellows (35) that is able to deform elastically in the axial direction is mounted to a cylinder hole (30) between the tip of a connection rod (34) and the cylinder (12). An expanding/contracting chamber (37) forms a compartment inside the bellows (35) between the connection rod (34) and the bellows (35), and a pressure chamber (38), which is linked to the expanding/contracting chamber (37) is disposed on the tip side of the piston (31). An incompressible indirect medium (39) is enclosed in the expanding/contracting chamber (37) and the pressure chamber (38). The average effective diameter (D2) of the bellows (35) is set so as to be smaller than the outer diameter (D1) of a sliding surface (32) of the piston (31).
Inventors:
MURAOKA HIROYUKI (JP)
Application Number:
PCT/JP2011/051921
Publication Date:
January 12, 2012
Filing Date:
January 31, 2011
Export Citation:
Assignee:
KOGANEI LTD (JP)
MURAOKA HIROYUKI (JP)
MURAOKA HIROYUKI (JP)
International Classes:
F04B43/10
Foreign References:
| JP2009138520A | 2009-06-25 | |||
| JP2008133800A | 2008-06-12 | |||
| JP2008128059A | 2008-06-05 | |||
| JP2008128178A | 2008-06-05 | |||
| DE2910328A1 | 1980-09-25 |
Attorney, Agent or Firm:
TSUTSUI, Yamato et al. (JP)
Tsutsui Daiwa (JP)
Tsutsui Daiwa (JP)
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Claims: