WO1995034336A1 - Vorrichtung zum insufflieren von gas - Google Patents
Vorrichtung zum insufflieren von gas Download PDFInfo
- Publication number
- WO1995034336A1 WO1995034336A1 PCT/DE1995/000756 DE9500756W WO9534336A1 WO 1995034336 A1 WO1995034336 A1 WO 1995034336A1 DE 9500756 W DE9500756 W DE 9500756W WO 9534336 A1 WO9534336 A1 WO 9534336A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- pressure
- flow
- control unit
- gas flow
- Prior art date
Links
- 241001465754 Metazoa Species 0.000 claims abstract description 5
- 238000009530 blood pressure measurement Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 7
- 241001639412 Verres Species 0.000 claims description 3
- 238000013022 venting Methods 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 71
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000013532 laser treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M13/00—Insufflators for therapeutic or disinfectant purposes, i.e. devices for blowing a gas, powder or vapour into the body
- A61M13/003—Blowing gases other than for carrying powders, e.g. for inflating, dilating or rinsing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3344—Measuring or controlling pressure at the body treatment site
Definitions
- the invention relates to a device for the insufflation of gas, such as CO 2 into a body cavity of a human or animal body.
- the known devices can have, for example, a pressure regulator which reduces the pressure of the gas source to an insufflation pressure (target gas pressure) which can typically be set between 0 and 50 mm Hg, and a flow regulator which reduces the gas flow to an adjustable value (target gas flow ) sets.
- target gas pressure insufflation pressure
- the gas pressure or the gas flow can not only be controlled but also regulated.
- these devices have a measuring device which has sensors for the actual gas pressure and the actual gas flow, and a control unit on which the. Output signals of these sensors are present, and which controls the pressure and flow controller.
- the measurement of the gas pressure is problematic in the known devices for the insufficiency of gas into a body cavity, since it is generally not possible or only with great effort to measure the gas pressure directly in the body cavity. Measuring the pressure outside the body cavity creates a measurement error due to the flowing gas and the pressure drop (caused by this, among other things), which cannot be tolerated in medical applications.
- the invention is based on the object of specifying a device for insufflating gas into a body cavity of a human or animal body, in which the pressure measurement required for regulating the gas pressure can be carried out, in particular outside the body, with the accuracy required for medical applications without the gas flow having to be "reduced” to the value 0 for the measurement.
- control unit for measuring the actual gas pressure controls the flow controller in such a way that the gas flow is set to a value between 10 and 40% of the target gas flow during the pressure measurement.
- the invention is based on the knowledge that static conditions are not absolutely necessary for a pressure measurement with the accuracy required for medical applications. Rather, it is sufficient if the flow for the period of the pressure measurement is set to a value which is "significantly" below the target gas flow, since the "relationship" between measurement errors in the pressure measurement and the value of the gas flow is not linear and with Approach to the target gas flow increases disproportionately. This is shown in Fig. 1.
- the invention represents a compromise between a pressure measurement that is as accurate as possible and an at least “uninterrupted” gas flow. According to the invention, it does not change to “0” during the pressure measurement, but instead only reduced to 10 to 40% and preferably to 15 to 30% (claim 2) of the target gas flow is still sufficient to ensure, for example, that the flue gases etc. are adequately removed during laser treatments. In addition, there are no disturbances or pulsation effects which occur in the prior art by switching off the gas flow during the pressure measurement.
- the measuring principle of the device according to the invention can be used in a wide variety of devices for insufflating gas in body cavities.
- the measuring principle is particularly advantageous in devices with high flow rates (> 10 1 / min.) Because the reduction in the gas flow particularly strongly reduces the pressure measurement error when determining the intra-abdominal pressure ppatient.
- a further advantageous application of the measuring principle according to the invention is given in devices in which, in a manner known per se, a heating device is provided which heats the gas to be insufflated to a predeterminable temperature (claim 10).
- This heating device can, for example, in the device itself, in or on the hose line between the actual device, ie between the control device and the instrument inserted in the body, and / or in or on the instrument or cutlery inserted in the body be provided.
- WO 94/28952 for the last-mentioned embodiment, which is particularly advantageous, reference is made to WO 94/28952.
- control unit adjusts the gas pressure and the gas flow taking into account the predetermined temperature of the gas. This reduces the time until the target values are reached; moreover, the measured values can be corrected according to the set temperature, so that the target / actual value management is improved.
- the control unit determines the conductance of the lines to the body cavity from the gas pressures measured by the pressure sensor at at least two different flow values. With the conductance it is possible to calculate the actual value of the pressure in the body cavity from the value of the gas pressure measured outside the body. This procedure has the advantage that the instrument does not have to be removed from the body for the exact determination of the conductance and thus the pressure in the body cavity. Furthermore, it is also not necessary to provide a second line for measuring the pressure in the body cavity.
- the device according to the invention can furthermore be particularly advantageous equipped with the features specified in claim 12 instru- • tarium:
- an endoscopic cutlery such as a Verres needle, can be provided, on which the sensors for gas pressure and gas flow are arranged outside the body cavity.
- FIG. 1 shows the relationship between the pressure measurement error and the flow
- Fig. 2 is a block diagram of a device according to the invention.
- Fig. 3 is a pressure or flow / time diagram for a device according to the invention.
- the device has, in a manner known per se, a gas source 1 and a measuring device which has sensors 2 and 3 for the actual gas pressure (2) and the actual gas flow (3).
- the sensors 2 and 3 are provided outside the body cavity either in a device part 43 or on an endoscopic cutlery 41, such as a Verres needle, which is connected via a single line 42 to the actual device part 43 of the device according to the invention.
- the latter possibility namely to arrange the sensors on the cutlery or instrument 41, has the advantage that it enables a very precise pressure measurement, but it is disadvantageous that a comparatively high outlay is required on the "instrument side". Therefore, the sensors 2 and 3 are usually arranged in the device 43.
- the device has an electronic control unit 5, which can consist, for example, of a conventional microcomputer circuit with conventional peripheral units and in particular connected A / D and D / A converters as well as usual input means and adjusting elements for the controllers.
- the output signals of sensors 2 and 3 are present at control unit 5.
- the control unit 5 controls a (fine) pressure regulator 6, which reduces or regulates the pressure of the gas source 1 or the pressure of the gas source 1 reduced by an unillustrated pressure reducer to an adjustable insufflation pressure (target gas pressure), and a flow regulator 7, which regulates the gas flow to an adjustable value (target gas flow).
- regulators 6 and 7 are shown as separate units.
- the two controllers 6 and 7 are combined to form a single control element.
- a heating device 8 which heats the gas to be insufflated to a predetermined temperature.
- the heating device is arranged in the instrument 4 without restricting the possibilities for arranging the heating device.
- the heating device 8 is also controlled by the control unit 5 or regulated by means of a temperature sensor (not shown). It is preferred if the control unit adjusts the gas pressure and the gas flow taking into account the predetermined temperature of the gas.
- a vent valve 9 is provided in the device according to the invention in a manner known per se to limit the intrabdominal pressure p, which valve opens at a certain pressure, for example a pressure of more than 50 mm Hg.
- This vent valve is also preferably arranged in the device 43.
- the control unit 5 for actively venting the device 43 and the line 42 can open and close the vent valve 9 even at pressures below the limit pressure at which damage to the patient can occur.
- control unit 5 controls the flow regulator 7 for measuring the actual gas pressure by means of the pressure sensor 2 or, in the case of a “combined unit”, the pressure and flow regulator 6 and 7 in such a way that the gas flow ⁇ Q / ⁇ t during the measurement of the pressure p is the sensor 2 to a value between 10 and 40%, preferably to a value between 15 and 30% of the target gas flow .DELTA.Q / ⁇ t so ⁇ tik ⁇ provides.
- the lowering of the river .DELTA.Q made by the inventive design device / ⁇ t may be det verwen ⁇ therefor, of at least two different flow values from the pressure sensor 2 measured gas pressures p pi_ the actual value t of the pressure in the body cavity determined.
- the control unit 5 determines the conductance of the lines, in particular a channel 44 in the instrument 41 to the body cavity from the at least two different flow values ⁇ Q / ⁇ t measured by the flow sensor 3 and measured by the pressure sensor 2. With the guide value it is possible to calculate the actual value of the pressure in the body cavity from the value p of the gas pressure measured outside the body. This procedure has the advantage that the instrument does not have to be removed from the body for the exact determination of the conductance and thus the pressure in the body cavity. Furthermore, it is also not necessary to provide a second line for measuring the pressure in the body cavity.
- the device according to the invention can be implemented with components, sensors and control units, as are known from the prior art. This eliminates the need not only to present a detailed exemplary embodiment, but also to provide further details, such as target gas pressure and target gas flow. In particular, the invention can have a known device largely corresponding "hardware" structure.
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Endoscopes (AREA)
- Surgical Instruments (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19580624T DE19580624B4 (de) | 1994-06-13 | 1995-06-13 | Vorrichtung zum Insufflieren von Gas |
US08/596,286 US5676155A (en) | 1994-06-13 | 1995-06-13 | Apparatus for insufflating gases |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4420465 | 1994-06-13 | ||
DEP4420465.5 | 1994-06-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995034336A1 true WO1995034336A1 (de) | 1995-12-21 |
Family
ID=6520371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1995/000756 WO1995034336A1 (de) | 1994-06-13 | 1995-06-13 | Vorrichtung zum insufflieren von gas |
Country Status (3)
Country | Link |
---|---|
US (1) | US5676155A (de) |
DE (1) | DE19580624B4 (de) |
WO (1) | WO1995034336A1 (de) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5908402A (en) * | 1997-02-03 | 1999-06-01 | Valleylab | Method and apparatus for detecting tube occlusion in argon electrosurgery system |
US6299592B1 (en) * | 1998-03-31 | 2001-10-09 | Northgate Technologies Inc. | Laparoscopic insufflator |
JP2000083894A (ja) * | 1998-09-11 | 2000-03-28 | Asahi Optical Co Ltd | 内視鏡用送気装置 |
US6261227B1 (en) * | 1998-11-12 | 2001-07-17 | Asahi Kogaku Kogyo Kabushiki Kaisha | Air feeding device for endoscope |
JP3809026B2 (ja) * | 1999-02-02 | 2006-08-16 | ペンタックス株式会社 | 内視鏡用送気装置の安全装置 |
US7361170B2 (en) | 2001-11-21 | 2008-04-22 | E-Z-Em, Inc. | Device, system, kit or method for collecting effluent from an individual |
US20030181857A1 (en) * | 2002-03-22 | 2003-09-25 | James Blake | Insufflation device with integral heater control |
US20040153027A1 (en) | 2002-10-28 | 2004-08-05 | Mantell Robert R. | Dual-capacity insufflator tube |
US7335159B2 (en) * | 2004-08-26 | 2008-02-26 | Scimed Life Systems, Inc. | Endoscope having auto-insufflation and exsufflation |
US8211128B1 (en) | 2004-10-15 | 2012-07-03 | Facundus Edward C | Multifunction gastric bypass apparatus and method |
US7806850B2 (en) | 2005-10-24 | 2010-10-05 | Bracco Diagnostics Inc. | Insufflating system, method, and computer program product for controlling the supply of a distending media to an endoscopic device |
PL2848192T3 (pl) | 2007-10-15 | 2022-05-02 | University Of Maryland, Baltimore | Urządzenie do zastosowania w badaniu okrężnicy pacjenta |
CN101485591B (zh) * | 2008-01-14 | 2012-07-04 | 庄海 | 智能化恒压变流气腹机 |
JP5815042B2 (ja) | 2010-11-24 | 2015-11-17 | ブラッコ ディアグノスティックス,インク. | Ctコロノグラフィーのための拡張媒体の供給及びその制御のためのシステム |
US10646667B2 (en) | 2017-05-31 | 2020-05-12 | Lexion Medical, Llc | Method and system for controlling pressurization of a patient cavity using a pressure sensor in a trocar |
US11433190B2 (en) | 2017-05-31 | 2022-09-06 | Lexion Medical, Llc | Method and system for controlling pressurization of a patient cavity using a pressure sensor of a medical appliance |
US10595897B2 (en) | 2016-08-30 | 2020-03-24 | Lexion Medical, Llc | Method and system for measuring pressure in a body cavity using a trocar |
US10835284B2 (en) * | 2016-10-13 | 2020-11-17 | Lexion Medical, Llc | Method and system for controlling pressurization of a patient cavity using cavity distension measured by a pressure sensor of a trocar |
CN109963605B (zh) * | 2016-11-14 | 2021-10-15 | 康美公司 | 对到体腔的连续气流进行连续压力监测的多模态手术气体递送系统 |
US10695511B2 (en) * | 2017-09-07 | 2020-06-30 | Conmed Corporation | Method for calibrating performance range of a pneumatically sealed trocar |
US11350966B2 (en) * | 2018-06-05 | 2022-06-07 | Conmed Corporation | System and method for controlling gas composition in a surgical cavity during endoscopic surgical procedures |
US11083494B2 (en) * | 2018-06-05 | 2021-08-10 | Conmed Corporation | System and method for controlling gas composition in a surgical cavity during endoscopic surgical procedures |
CN110251785B (zh) * | 2019-06-04 | 2021-08-06 | 中南大学湘雅医院 | 一种用于医疗的耳科病人送药装置 |
US20210187242A1 (en) * | 2019-12-23 | 2021-06-24 | Ethicon, Inc. | Fluid Delivery System for Creating Separation Between Biological Surfaces |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0169972B1 (de) * | 1984-04-11 | 1989-08-30 | Kurt Prof. Dr. Semm | Vorrichtung zum Insufflieren von Gas in den Körper |
FR2663231A1 (fr) * | 1990-06-15 | 1991-12-20 | Walz Elektronik Gmbh | Insufflateur. |
-
1995
- 1995-06-13 WO PCT/DE1995/000756 patent/WO1995034336A1/de active Application Filing
- 1995-06-13 DE DE19580624T patent/DE19580624B4/de not_active Expired - Lifetime
- 1995-06-13 US US08/596,286 patent/US5676155A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0169972B1 (de) * | 1984-04-11 | 1989-08-30 | Kurt Prof. Dr. Semm | Vorrichtung zum Insufflieren von Gas in den Körper |
FR2663231A1 (fr) * | 1990-06-15 | 1991-12-20 | Walz Elektronik Gmbh | Insufflateur. |
Also Published As
Publication number | Publication date |
---|---|
DE19580624B4 (de) | 2004-12-09 |
DE19580624D2 (de) | 1997-06-05 |
US5676155A (en) | 1997-10-14 |
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