US6554799B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biological precision screw pump
Assignee: Todai TLO Ltd
•
Filing: 2000-03-14
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Granted: 2003-04-29
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Expires: 2020-03-14
Abstract
Abstract The present invention provides a suction and injection pump capable of transferring a sufficient amount of viscous liquid even with a very thin suction and injection pipe, thereby enabling suction or injection of a viscous liquid while minimizing invasion into a human body. A pump according to the present invention effectively sucks or injects a viscous liquid by housing a very thin rotor in a cylindrical needle and positively transferring the liquid based on the mechanical configuration of the rotor. The configuration of the present invention reduces the diameter of a pipe while minimizing invasion into a human body.
Inventors
- 👤 Yotaro Hatamura
- 👤 Masayuki Nakao
- 👤 Takenori Okusa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:16
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/20; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
50 words
A needle-shaped precision screw pump of a very small diameter for injecting or ejecting a liquid into or from a biological tissue comprising a cylindrical thin needle and a rotor housed in said needle for rotation along an axial direction thereof, said rotor comprising a plurality of filaments twisted together.
Claim 2
Dependent Claim
50 words
A needle-shaped precision screw pump of a very small diameter for injecting or ejecting a liquid into or from a biological tissue comprising a cylindrical thin needle and a rotor housed in said needle for rotation along an axial direction thereof, said rotor comprising a plurality of filaments twisted together.
Claim 3
Dependent Claim
125 words
A precision screw pump in an instrument for injecting or ejecting a liquid into or from a biological tissue, comprising a cylindrical thin needle having an introduction port at one end and a discharge port at the other end, a cylinder connected to one end of the needle and having a larger diameter than the needle, a rotor housed in said needle for rotation along an axial direction thereof, and a driver housed in said cylinder and connected to one end of said rotor for rotating the rotor, wherein said rotor comprises a plurality of filaments twisted together and is rotated in synchronism with the rotation of said driver to transfer a liquid through said thin needle from said introduction port to said discharge port.
Claim 4
Dependent Claim
125 words
A precision screw pump in an instrument for injecting or ejecting a liquid into or from a biological tissue, comprising a cylindrical thin needle having an introduction port at one end and a discharge port at the other end, a cylinder connected to one end of the needle and having a larger diameter than the needle, a rotor housed in said needle for rotation along an axial direction thereof, and a driver housed in said cylinder and connected to one end of said rotor for rotating the rotor, wherein said rotor comprises a plurality of filaments twisted together and is rotated in synchronism with the rotation of said driver to transfer a liquid through said thin needle from said introduction port to said discharge port.
Claim 5
Dependent Claim
20 words
The precision screw pump according to claim 2 wherein said cylindrical needle comprises a smooth-surface substance having a predetermined strength.
Claim 6
Dependent Claim
20 words
The precision screw pump according to claim 2 wherein the filaments constituting said rotor are covered with the smooth-surface substance.
Claim 7
Dependent Claim
24 words
The precision screw pump claim 2 wherein said rotor has a screw angle set between 15 and 35° relative to a rotational center axis.
Claim 8
Dependent Claim
25 words
The precision screw pump according to claim 2 , wherein said cylindrical needle has a small diameter in proportion to a diameter of the rotor.
Claim 9
Dependent Claim
20 words
The precision screw pump according to claim 6 , wherein said cylindrical needle has an inner diameter of 0.03 mm.
Claim 10
Dependent Claim
20 words
The precision screw pump according to claim 2 , wherein each of said plurality of filaments is a steel wire.
Claim 11
Dependent Claim
43 words
A rotor for a screw pump comprising a plurality of filaments twisted together wherein said filaments are coated with an adhesive and said rotor has a screw angle set between about 15° and 35° relative to a rotational center axis of said rotor.
Claim 12
Dependent Claim
43 words
A rotor for a screw pump comprising a plurality of filaments twisted together wherein said filaments are coated with an adhesive and said rotor has a screw angle set between about 15° and 35° relative to a rotational center axis of said rotor.
Claim 13
Independent Claim
46 words
A method for producing a screw pump rotor including a plurality of adhesive-coated filaments, the method comprising: providing a plurality of filaments; coating an adhesive on the plurality of filaments; twisting the plurality of filaments together; and curing the adhesive to form the screw pump rotor.
Claim 14
Independent Claim
46 words
A method for producing a screw pump rotor including a plurality of adhesive-coated filaments, the method comprising: providing a plurality of filaments; coating an adhesive on the plurality of filaments; twisting the plurality of filaments together; and curing the adhesive to form the screw pump rotor.
Claim 15
Dependent Claim
14 words
The method according to claim 10 , wherein the adhesive is a photocurable resin.
Claim 16
Dependent Claim
41 words
A biological liquid injection and ejection instrument comprising a micro screw pump comprising a thin cylindrical hollow needle and a rotor housed in said needle for rotation along an axial direction thereof, said rotor comprising a plurality of filaments twisted together.
Claim 17
Dependent Claim
41 words
A biological liquid injection and ejection instrument comprising a micro screw pump comprising a thin cylindrical hollow needle and a rotor housed in said needle for rotation along an axial direction thereof, said rotor comprising a plurality of filaments twisted together.
Claim 18
Dependent Claim
47 words
A biological liquid injection and ejection instrument comprising a micro screw pump comprising a thin cylindrical hollow needle and a rotor housed in said needle for rotation along an axial direction thereof, said hollow needle having a small diameter in proportion to a diameter of said rotor.
Claim 19
Dependent Claim
47 words
A biological liquid injection and ejection instrument comprising a micro screw pump comprising a thin cylindrical hollow needle and a rotor housed in said needle for rotation along an axial direction thereof, said hollow needle having a small diameter in proportion to a diameter of said rotor.
Claim 20
Dependent Claim
57 words
A needle-shaped precision screw pump of a very small diameter for injecting or ejecting a liquid into or from a biological tissue comprising a cylindrical thin needle and a rotor housed in said needle for rotation along an axial direction thereof, said cylindrical thin needle having a small diameter in proportion to a diameter of the rotor.
Claim 21
Dependent Claim
57 words
A needle-shaped precision screw pump of a very small diameter for injecting or ejecting a liquid into or from a biological tissue comprising a cylindrical thin needle and a rotor housed in said needle for rotation along an axial direction thereof, said cylindrical thin needle having a small diameter in proportion to a diameter of the rotor.
Claim 22
Dependent Claim
129 words
A precision screw pump in an instrument for injecting or ejecting a liquid into or from a biological tissue, comprising: a cylindrical thin needle having an introduction port at one end and a discharge port at the other end; a cylinder connected to one end of the needle and having a larger diameter than said needle; a rotor housed in said needle for rotation along an axial direction thereof; and a driver housed in said cylinder and connected to one end of said rotor; wherein said cylindrical thin needle has a small diameter in proportion to a diameter of said rotor and said rotor is rotated in synchronism with the rotation of said driver to transfer a liquid through said needle from said introduction port to said discharge port.
Claim 23
Dependent Claim
129 words
A precision screw pump in an instrument for injecting or ejecting a liquid into or from a biological tissue, comprising: a cylindrical thin needle having an introduction port at one end and a discharge port at the other end; a cylinder connected to one end of the needle and having a larger diameter than said needle; a rotor housed in said needle for rotation along an axial direction thereof; and a driver housed in said cylinder and connected to one end of said rotor; wherein said cylindrical thin needle has a small diameter in proportion to a diameter of said rotor and said rotor is rotated in synchronism with the rotation of said driver to transfer a liquid through said needle from said introduction port to said discharge port.
Claim 24
Dependent Claim
19 words
The precision screw pump according to claim 15 , wherein said rotor comprises a plurality of filaments twisted together.
Claim 25
Dependent Claim
23 words
The precision screw pump according to claim 16 , wherein the plurality of filaments constituting said rotor are covered with the smooth-surface substance.
Claim 26
Dependent Claim
27 words
The precision screw pump according to claim 16 , wherein said rotor has a screw angle set between 15° and 35° relative to a rotational center axis.
Claim 27
Dependent Claim
20 words
The precision screw pump according to claim 16 , wherein each of the plurality of filaments is a steel wire.
Claim 28
Dependent Claim
19 words
The precision screw pump according to claim 15 , wherein said needle has an inner diameter of 0.03 mm.
Claim 29
Dependent Claim
20 words
The precision screw pump according to claim 15 , wherein said needle comprises a smooth-surface substance having a predetermined strength.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-04-28 | 2006-10-28 | 2007-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-04-28 | 2010-10-28 | 2011-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-04-28 | 2014-10-28 | 2015-04-29 | $7700.00 | Window Closed / Lapsed |