US5630799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid management system
Assignee: Smith and Nephew Inc
•
Filing: 1995-11-09
•
Granted: 1997-05-20
•
Expires: 2015-11-09
Abstract
Abstract Apparatus for supplying liquid to a body cavity during an endoscopic procedure includes a feedback loop-controlled liquid supply device inherently capable of supplying liquid at a substantially constant pressure substantially independent of the flow rate of liquid delivered by the liquid supply device within a relatively wide range of flow rate. Also disclosed are a disposable plastic pump cassette having an inflow pump in a housing, and an operative cannula. The surgical procedure is performed with continuous control over the body cavity pressure, regardless of the outflow flow rate.
Inventors
- 👤 David G. Beiser
- 👤 Steven B. Woolfson
- 👤 Kenneth W. Krause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:57
CPC Classifications
A; A61; A61B; A61B1/00; A61B1/00131; A61B1/00135; A61B1/12; A61B17/00; A61B17/32; A61B17/320016; A61B17/34; A61B17/3417; A61B17/3421; A61M; A61M1/00; A61M1/71; A61M1/72; A61M1/77; A61M3/00; A61M3/02; A61M3/0201; A61M3/0202; A61M3/0204; A61M3/0216; A61M3/022; A61B17/00234; A61B17/16; A61B17/1604; A61M2205/00; A61M2205/12; A61M2205/128; A61M2205/33; A61M2205/3331; A61M2205/3344; A61M2205/50; A61M3/0233; A61M3/0254; A61M3/0258; Y; Y10; Y10S; Y10S128/00; Y10S128/13
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
239 words
Apparatus for supplying liquid under pressure to a body cavity and establishing a predetermined body cavity pressure during an endoscopic procedure, which comprises: a) a centrifugal inflow pump for supplying liquid at a pressure suitable for said predetermined body cavity pressure: b) means for generating a body cavity pressure signal representing the pressure in said body cavity comprising pressure sensor means in communication with liquid under pressure delivered by said centrifugal inflow pump at a location upstream of said body cavity and pressure signal processing means for calculating the value of the pressure in said body cavity from said sensed pressure and for generating a calculated body cavity pressure signal as said body cavity pressure signal; c) conduit means for communicating said centrifugal inflow pump with said body cavity to deliver liquid under pressure to said body cavity; d) control means responsive to said body cavity pressure signal for increasing or decreasing the pressure of said liquid delivered by said centrifugal inflow pump to thereby maintain said body cavity pressure at said predetermined pressure; e) said centrifugal inflow pump, when supplying said liquid at said suitable pressure, having an outflow flow rate that is inherently inversely responsive to changes in said body cavity pressure; f) a liquid outflow cannula for insertion into said body cavity; and g) a source of suction communicating with said liquid outflow cannula for aspirating liquid from said body cavity via said liquid outflow cannula.
Claim 2
Dependent Claim
239 words
Apparatus for supplying liquid under pressure to a body cavity and establishing a predetermined body cavity pressure during an endoscopic procedure, which comprises: a) a centrifugal inflow pump for supplying liquid at a pressure suitable for said predetermined body cavity pressure: b) means for generating a body cavity pressure signal representing the pressure in said body cavity comprising pressure sensor means in communication with liquid under pressure delivered by said centrifugal inflow pump at a location upstream of said body cavity and pressure signal processing means for calculating the value of the pressure in said body cavity from said sensed pressure and for generating a calculated body cavity pressure signal as said body cavity pressure signal; c) conduit means for communicating said centrifugal inflow pump with said body cavity to deliver liquid under pressure to said body cavity; d) control means responsive to said body cavity pressure signal for increasing or decreasing the pressure of said liquid delivered by said centrifugal inflow pump to thereby maintain said body cavity pressure at said predetermined pressure; e) said centrifugal inflow pump, when supplying said liquid at said suitable pressure, having an outflow flow rate that is inherently inversely responsive to changes in said body cavity pressure; f) a liquid outflow cannula for insertion into said body cavity; and g) a source of suction communicating with said liquid outflow cannula for aspirating liquid from said body cavity via said liquid outflow cannula.
Claim 3
Dependent Claim
14 words
Apparatus according to claim 1, wherein said source of suction is a suction pump.
Claim 4
Dependent Claim
39 words
Apparatus according to claim 1, wherein tubing means connects said source of suction to said liquid outflow cannula and means is provided selectively to crimp said tubing and thus selectively restrict flow of liquid aspirated from said body cavity.
Claim 5
Dependent Claim
45 words
Apparatus according to claim 1, wherein said pressure sensor means comprises a pressure transducer means and an operative pressure-sensing diaphragm, and said pressure signal generating means includes channel means for directing a column of liquid from liquid flowing through said conduit means to said diaphragm.
Claim 6
Dependent Claim
50 words
Apparatus according to claim 4, wherein said pressure sensor means comprises a chamber having an open end, a thin, flexible diaphragm closing said open end, channel means for directing liquid delivered from said liquid supply means to said chamber, and pressure transducer means in operative contact with said flexible diaphragm.
Claim 7
Dependent Claim
22 words
Apparatus according to claim 1, wherein said location of said pressure sensor means is adjacent the outlet of said centrifugal inflow pump.
Claim 8
Dependent Claim
49 words
Apparatus according to claim 6, wherein said pressure sensor means comprises a chamber having an open end, a thin, flexible diaphragm closing said open end, channel means for directing liquid delivered from said pump outlet to said chamber, and pressure transducer means in operative contact with said flexible diaphragm.
References Cited (Backward Citations)
FR430890A
Cited
US2022369A
Cited
US2524764A
Cited
US3139832A
Cited
US3459183A
Cited
USRE28742E
Cited
US4037984A
Cited
US3970408A
Cited
US3957389A
Cited
US3585996A
Cited
US3565078A
Cited
US3647324A
Cited
US3659587A
Cited
US3864055A
Cited
US3773046A
Cited
US3766916A
Cited
US3825001A
Cited
US3837381A
Cited
US3853127A
Cited
US3900022A
Cited
FR2272633B1
Cited
US4007742A
Cited
US3930505A
Cited
US4000739A
Cited
US4180074A
Cited
US4117843A
Cited
US4203444B1
Cited
US4203444A
Cited
US4194509A
Cited
US4194509B1
Cited
US4263808A
Cited
US4261360A
Cited
GB2065479B
Cited
GB2088215B
Cited
US4314480A
Cited
US4394862A
Cited
US4493694A
Cited
US4395258A
Cited
EP0051718B1
Cited
IE52353B1
Cited
US4430081A
Cited
US4443219A
Cited
US4496342A
Cited
US4423727A
Cited
US4436519B1
Cited
US4436519A
Cited
US4489750A
Cited
US4424833A
Cited
US4491126A
Cited
US4561431A
Cited
US4635621A
Cited
US4655197A
Cited
US4555645A
Cited
US4539998A
Cited
US4526574A
Cited
US4747826A
Cited
US4838865A
Cited
US4604089A
Cited
US4573888A
Cited
DE3338758C2
Cited
US4655752A
Cited
US4900302A
Cited
US4662829A
Cited
US4741678A
Cited
US4576181A
Cited
US4778445A
Cited
US4795424A
Cited
US4662871A
Cited
US4610256B1
Cited
US4610256A
Cited
US4598579A
Cited
US4673393A
Cited
US4935005A
Cited
US4798090A
Cited
US4650462A
Cited
US4929235A
Cited
US4750902A
Cited
US4626245A
Cited
US4705508A
Cited
US4658829A
Cited
US4649904A
Cited
US4679596A
Cited
US4671792A
Cited
US5000733A
Cited
US4701160A
Cited
US4809679A
Cited
US4820265A
Cited
US4973311A
Cited
US4755168A
Cited
US4795440A
Cited
US4873986A
Cited
US4785822A
Cited
US4781525A
Cited
US4902277A
Cited
US4798594A
Cited
US4949723A
Cited
US4909798A
Cited
US4940457A
Cited
US5053002A
Cited
US4998914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-05-19 | 2000-11-18 | 2001-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-19 | 2004-11-18 | 2005-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-19 | 2008-11-18 | 2009-05-20 | $7700.00 | Window Closed / Lapsed |