IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0624845
(1975-10-22)
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| 우선권정보 |
DT-2451383 (1974-10-26) |
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발명자
/ 주소 |
- Lindemann Hans-Joachim (Kleiner Schaferkamp 43 2 Hamburg 6 DT) Wiest Peter P. (Gothaallee 19 1 Berlin 19 DT)
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| 인용정보 |
피인용 횟수 :
35 인용 특허 :
0 |
초록
▼
The insufflator is used for introducing limited quantities of carbon dioxide into the human body for operational purposes, particularly for laparoscopy or hysteroscopy, and is of the type comprising two pressure reducers, in series, followed by a gas flow monitoring device through which carbon dioxi
The insufflator is used for introducing limited quantities of carbon dioxide into the human body for operational purposes, particularly for laparoscopy or hysteroscopy, and is of the type comprising two pressure reducers, in series, followed by a gas flow monitoring device through which carbon dioxide is directed from a gas supply to the human body. The two pressure reducers are constantly adjusted to fixed gas supply pressures, and the monitoring device comprises a cylindrical expansion container having a central inlet port and a large diameter, and in whose peripheral zone the gas flow velocity approaches a zero rate. First and second sensing elements for the measured variable are provided in the expansion container, with the first sensing element being located immediately in the area of the inlet port and the second sensing element being located close to the cylindrical side wall at the maximum possible radial spacing from the first sensing element. The two sensing elements are included in a measuring bridge and a measuring amplifier is connected to the bridge output, with an indicator, of the rate of gas flow per unit of time, being connected to the amplifier output. For laparoscopy, the second pressure reducer is adjusted to a gas supply pressure of 15 mm Hg, and the expansion container is followed by a precision needle valve adjustable in the range of zero to 2 liters per minute. For hysteroscopy, the second pressure reducer is constantly adjusted to a supply pressure of 200 mm Hg and the expansion container is followed by a precision aperture limiting the maximum gas flow to 100 ml/min.
대표청구항
▼
In an insufflator for introducing limited quantities of carbon dioxide into the human body for operational purposes, particularly for laparoscopy of the type including an inlet for connection to a source of carbon dioxide under pressure, an adapter connection for medical instruments, particularly, l
In an insufflator for introducing limited quantities of carbon dioxide into the human body for operational purposes, particularly for laparoscopy of the type including an inlet for connection to a source of carbon dioxide under pressure, an adapter connection for medical instruments, particularly, laparascopes and hysteroscopes, insertable in the human body, and pressure regulator means connected in series to the inlet and followed by a gas flow monitoring device, and through which, in series, the carbon dioxide is directed from the gas supply to the adapter connection, the improvement comprising, in combination, said pressure regulator means being constituted by two pressure regulators connected in series between said inlet and said flow-monitoring device and constantly adjusted to respective fixed gas supply pressures; said monitoring device comprising an expansion container having end and side walls with an inlet port located centrally of one end wall and an outlet port located centrally of the other end wall, the expansion container having a large cross-sectional area perpendicular to the flow direction therethrough, and having a peripheral zone spaced laterally from said inlet and outlet ports in which the gas flow velocity approaches a zero rate; sensing elements, providing currents corresponding to a measured variable of the gas flow, provided in said expansion container and including first sensing element located immediately in the area of said inlet port, and subjected to the gas flow, and a second sensing element located in said peripheral zone close to the side wall of said container at the maximum possible lateral spacing from said first element; a flow-directing cylindrical screen surrounding said first sensing element and shielding said second sensing element from the gas flow through said inlet port to said outlet port; a precision aperture, permanently adjusted to the maximum rate of flow, connected in series following said outlet port; an adjustable precision needle valve following said precision aperture; a pressure gauge connected to said adapter connection to indicate the back pressure at said adapter connection; a measuring bridge including said first and second sensing elements and having an input and an output; a source of electrical potential connected to the input of said measuring bridge; a measuring amplifier having an input connected to the bridge output and deriving the quotient of the respective currents of said first and second sensing elements, and having an output; an indicator, of the rate of gas flow per unit of time, connected to the amplifier output; the rate of flow being adjustable by said precision needle valve in accordance with the reading of said indicator; an integrator connected to the output of said amplifier; and a second indicator, for indicating the total gas flow, connected to said integrator, whereby the reading of said second indicator permits the drawing of a quantitative conclusion as to the size of the gas bubble in the human body.
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