EP0529902A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fluid management system
Assignee: Smith and Nephew Inc
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Filing: 1992-08-17
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Granted: —
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Expires: 2012-08-17
Abstract
Abstract There is disclosed an apparatus for supplying liquid to a body cavity (10) during an endoscopic procedure including 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
EP
Data Source
google_patents
Last Synchronized
2026-10-23 22:21
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: 33
Claim 1
Independent Claim
116 words
Apparatus for supplying liquid to a body cavity during an endoscopic procedure, which comprises: a) liquid supply means (4) whose outflow flow rate is inherently inversely responsive to changes in the body cavity pressure; b) means for generating a body cavity pressure signal (11) representing the pressure in said body cavity (10); c) conduit means (7) for communicating said liquid supply means (4) with said body cavity (10) to deliver liquid under pressure to said body cavity (10); and d) control means (40) responsive to said body cavity pressure signal for increasing or decreasing the pressure of said liquid delivered by said liquid supply means to thereby maintain said body cavity pressure at a predetermined value.
Claim 2
Dependent Claim
133 words
Apparatus for supplying liquid to a body cavity during an endoscopic procedure, which comprises: a) liquid supply means (4) inherently capable of supplying liquid at a substantially constant pressure substantially independent of the flow rate of liquid delivered by the liquid supply means within a relatively wide range of flow rate; b) sensing means (11) for generating a body cavity pressure signal representing the pressure in said body cavity (10); c) conduit means (7) for communicating said liquid supply means with said body cavity (10) to deliver liquid under pressure to said body cavity (10); and d) control means (40) responsive to said body cavity pressure signal for increasing or decreasing the pressure of said liquid delivered by said liquid supply means to thereby maintain said body cavity pressure at a predetermined value.
Claim 3
Dependent Claim
166 words
Apparatus for supplying liquid to a body cavity during an endoscopic procedure, which comprises: a) liquid supply means (4) for supplying liquid under pressure; b) means for generating a body cavity pressure signal (11) representing the pressure in said body cavity comprising sensor means in communication with liquid under pressure delivered by said liquid supply means at a location upstream of said body cavity (10) and pressure signal processing means (13) for calculating the value of the pressure in said body cavity (10) from said sensed pressure and for generating a calculated body cavity pressure signal as said body cavity pressure signal; c) conduit means (7) for communicating said liquid supply means (4) with said body cavity (10) to deliver liquid under pressure to said body cavity (10); and d) control means (40) responsive to said body cavity pressure signal for increasing or decreasing the pressure of said liquid delivered by said liquid supply means to thereby maintain said body cavity pressure at a predetermined value.
Claim 4
Dependent Claim
24 words
Apparatus as claimed in claim 1, 2 or 3, wherein said means for generating said body cavity pressure signal is a pressure sensing means.
Claim 5
Dependent Claim
72 words
Apparatus as claimed in claim 4, wherein said pressure sensing means comprises sensor means (11) in communication with liquid under pressure delivered by said liquid supply means at a location upstream of said body cavity (10) and pressure signal processing means (13) 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.
Claim 6
Dependent Claim
45 words
Apparatus as claimed in claim 5, wherein said sensor means comprises a pressure transducer means (11) and an operative pressure-sensing diaphragm, and said pressure sensing means includes channel means for directing a column of liquid from liquid flowing through said conduit means to said diaphragm.
Claim 7
Dependent Claim
52 words
Apparatus as claimed in claim 5 or 6, wherein said 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 8
Dependent Claim
20 words
Apparatus as claimed in any one of the preceding claims, wherein said liquid supply means is a dynamic pump means.
Claim 9
Dependent Claim
16 words
Apparatus as claimed in claim 8, wherein said dynamic pump means is a centrifugal inflow pump.
Claim 10
Dependent Claim
38 words
Apparatus as claimed in claim 8 or 9, when dependent directly or indirectly, on any one of claims 3, 5, 6 and 7, wherein said location of said sensor means is adjacent the outlet of said pump means.
Claim 11
Dependent Claim
49 words
Apparatus as claimed in claim 10, wherein said 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.
Claim 12
Dependent Claim
53 words
Apparatus as claimed in any one of the preceding claims, wherein a liquid outflow cannula (14) is provided for insertion into said body cavity (10) and a source of suction (18) is provided communicating with said outflow cannula (14) for aspirating liquid from said body cavity (10) via said liquid outflow cannula (14).
Claim 13
Dependent Claim
15 words
Apparatus as claimed in claim 12, wherein said source of suction is a suction pump.
Claim 14
Dependent Claim
45 words
Apparatus as claimed in claim 12 or 13, wherein tubing means (16) connects said source of suction (18) to said liquid outflow cannula (14) and means is provided selectively to crimp said tubing and thus selectively restrict flow of liquid aspirated from said body cavity.
Claim 15
Dependent Claim
148 words
Apparatus as claimed in any one of the preceding claims, wherein said liquid supply means comprises a centrifugal inflow pump, and includes a motor for driving said centrifugal inflow pump, a tachometer for generating a tachometer signal indicating the actual speed of said motor, and pressure signal processing means comprises input means for receiving said tachometer signal, a signal indicating said sensed pressure, and a signal indicating a desired set pressure, means for calculating from said input signals a target tachometer signal as said calculated body cavity signal as a function of the pressure drops between said liquid supply means to said sensor means and between said sensor means to said body cavity, said target tachometer signal representing the motor speed necessary to increase or decrease the pressure of liquid delivered by said centrifugal inflow pump means to thereby maintain said body cavity pressure at said predetermined value.
Claim 16
Dependent Claim
106 words
A disposable plastic pump cassette (200) for use in an endoscopic surgical procedure, comprising a housing (201); an inflow pump means (4) in said housing (201) for supplying liquid under pressure to a body cavity (10) during the endoscopic procedure, and conduit means (203,204) within said housing (201) for supplying liquid to and delivering liquid under pressure from said inflow pump means (4); and an outflow suction pump means (18) in said housing (201) for aspirating liquid from a body cavity during the endoscopic procedure, and conduit means (214,215) within said housing (201) for supplying liquid to and delivering liquid from said outflow pump means (18).
Claim 17
Dependent Claim
18 words
A cassette as claimed in claim 16, wherein said outflow suction pump means is a displacement pump means.
Claim 18
Dependent Claim
31 words
A cassette as claimed in claim 16 or 17, wherein said outflow pump means comprises coupling means for non-contact coupling of said pump means to a motor externally of said housing.
Claim 19
Dependent Claim
22 words
A cassette as claimed in claim 18, wherein said coupling means is means for magnetically coupling said pump means to its motor.
Claim 20
Dependent Claim
110 words
A disposable plastic pump cassette (200) for use in an endoscopic surgical procedure, comprising a housing (201); an inflow pump means (4) in said housing for supplying liquid under pressure to a body cavity (10) during the endoscopic procedure, and conduit means (203,204) within said housing (201) for supplying liquid to and delivering liquid under pressure from said inflow pump means (4); and resilient tubing means (400) in said housing, and means for connecting said tubing means in series with conduit means for aspirating liquid from a body cavity during the endoscopic procedure, whereby crimping of said resilient tubing means restricts the flow of liquid aspirated from said body cavity.
Claim 21
Dependent Claim
108 words
A disposable plastic pump cassette for use in an endoscopic surgical procedure, comprising a housing (201); an inflow pump means (4) in said housing (201) for supplying liquid under pressure to a body cavity (10) during the endoscopic procedure, and inlet and outlet conduit means (203,204) within said housing (201) for supplying liquid to and delivering liquid under pressure from said inflow pump means (4); and a chamber (253) in said housing (201) having an open end, a thin, flexible diaphragm (251) closing said open end, and channel means (204a) in said outlet conduit means for directing liquid delivered from said pump means (4) to said chamber (253).
Claim 22
Dependent Claim
22 words
A cassette as claimed in any one of claims 16 to 21, wherein said inflow pump means is a dynamic pump means.
Claim 23
Dependent Claim
16 words
A cassette as claimed in claim 22, wherein said dynamic pump means is a centrifugal pump.
Claim 24
Dependent Claim
35 words
A cassette as claimed in any one of claims 16 to 23, wherein said inflow pump means comprises coupling means for non-contact coupling of said inflow pump means to a motor externally of said housing.
Claim 25
Dependent Claim
23 words
A cassette as claimed in claim 24, wherein said coupling means is means for magnetically coupling said inflow pump means to its motor.
Claim 26
Dependent Claim
83 words
A cannula comprising a body portion and a needle portion (91), an internal bore extending through both said portions, and an elastomeric sealing means mounted in said body portion for sealing said internal bore, said sealing means comprising a one-piece elastomeric molding having opposed elastomeric face members and an integral elastomeric mounting member about the periphery of said face members, said face members each having a slit formed therein, the slit in one face being transverse to the slit in the other face.
Claim 27
Dependent Claim
81 words
A cannula comprising a body portion (601) with an internal bore (604) extending therethrough and opposed distal and proximal ends (603,602), an elastomeric sealing means (605,606) mounted at said proximal end (602) for sealing said internal bore (604), said sealing means (605,606) comprising opposed, spaced apart, first and second substantially planar sealing members, said first sealing member (605) having a substantially circular aperture (605a) therein and said second sealing member (606) having sealing elements (606a,606b) formed by a slit (606c) therein.
Claim 28
Dependent Claim
54 words
A cannula as claimed in claim 27, wherein said second sealing member is spaced distally of said first sealing member by a distance that prevents extrusion of said sealing elements through said aperture of said first sealing member when a tool is moved through said sealing members toward the proximal end of said cannula.
Claim 29
Dependent Claim
22 words
A cannula as claimed in claim 27 or 28, wherein said first sealing member is spaced distally of said second sealing member.
Claim 30
Dependent Claim
29 words
A cannula as claimed in claim 27, 28 or 29, wherein said body portion is circular in cross-section and has a circular groove formed therein near said distal end.
Claim 31
Dependent Claim
59 words
A cannula having a body portion and opposed proximal and distal ends, an internal bore within said body portion extending through said proximal end, a tapered obturator tip at said distal end closing said internal bore, and aperture means in said body portion adjacent said obturator tip for permitting liquid flowing through said internal bore to exit the cannula.
Claim 32
Dependent Claim
19 words
A cannula as claimed in claim 31, wherein said aperture means are circumferentially spaced openings in said body portion.
Claim 33
Dependent Claim
62 words
A cannula as claimed in claim 31 or 32, wherein an elastomeric sealing means is mounted at said proximal end for sealing said internal bore, said sealing means comprising opposed, spaced apart, first and second substantially planar sealing members, said first sealing member having a substantially circular aperture therein and said second sealing member having sealing elements formed by a slit therein.
References Cited (Backward Citations)
No citation records indexed.
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