Insufflation device for endoscopic intervention

• US 5,013,294 A
• Filed: 11/17/1988
• Issued: 05/07/1991
• Est. Priority Date: 11/17/1987
• Status: Expired due to Fees

• Current Assignee: Richard Wolf GmbH Knittlingen
• Original Assignee: Richard Wolf GmbH (Richard & Annemarie Wolf- Stiftung)
• Inventors: Baier, Manfred
• Primary Examiner(s): Green, Randall L.
• Assistant Examiner(s): Reichle, K. M.
• Application Number:
  US07/272,315
• Time in Patent Office: 901 Days
• Field of Search: 604/23, 604/26, 604/57, 604/65, 604/67, 604/118, 604/246, 128/747, 128/748, 128/4
• US Class Current: 604/26
• CPC Class Codes: A61B 1/015 Control of fluid supply or evacuation
• CPC Class Codes: A61M 13/003 Blowing gases other than for carrying powders, e.g. for inflating, dilating or rinsing

Abstract

An insufflation device for filling a body cavity, such as an abdominal cavity, with a gas from a gas bottle via an expansion valve and a feed pipe leading to the body cavity characterized by the feed pipe being formed along in length by two channels with the first of the two channels having an expansion valve for setting an overpressure for rapid filling of the body cavity during an initial period and the second channel having an expansion valve to adjust the pressure to the pressure desired in the body cavity. The pressure of the second flow is monitored and compared by an electronic evaluator system, which will interrupt the flow and sound alarms if the pressure exceeds a predetermined amount over the desired value and also if the pressure exceeds a predetermined maximum amount.

Claims

1. In an insufflation device for introducing a gas into a body cavity through a feed pipe, said device including a feed pipe, a source of gas being selectively connected to an expansion valve by one of a direct line and a second line having an intermediate container, said expansion valve being connected by a shut-off valve, a pressure regulator and flow indicator to the feed pipe which has an end connected to a cannula insertable into the body cavity, the improvements comprising the flow indicator being connected to two parallel flow channels leading to a switching valve connected to said feed pipe, a first flow channel of the two parallel flow channels having a shut-off valve and an expansion valve means for setting the gas pressure at a value above a desired, required pressure in the body cavity, a second flow channel of the two parallel flow channels having an expansion valve being adjustable to the desired, required pressure of the body cavity, flow sensor means for determining the flow in the second flow channel, a first pressure pickup and a first pressure indicator, said feed pipe downstream of said switching valve being connected to a second pressure pickup with a second pressure indicator, first means for constantly comparing the first and second pressure indicators, said switching valve having control means for changing the switching valve between a first position only connecting the first flow channel to the pipe for an initial time period and a second position only connecting a second flow channel to the pipe, said flow sensor means monitoring the flow in the second flow channel while the switching valve is in the second position and then creating a signal for the control means to change the switching valve back to the first position if the flow in the second flow channel exceeds a predetermined amount.

2. In an insufflation device according to claim 1, wherein said first means includes electronic evaluation means for triggering a first signal when the pressure in the body cavity is exceeded by a specific preselectible value above said desired, required pressure and said electronic evaluation means triggering a second signal for blocking the gas feed into the body cavity when the pressure in the body cavity exceeds a preselected limiting value which is greater than said specific preselectible value.

3. In an insufflation device according to claim 2, wherein said evaluation mans being activated due to preselected limiting value being exceeded to prevent operation of the device until after performing an elimination and correction of the wrong operation, faulty control action and erroneous handling which caused the exceeding of the preselected limiting value.

4. In an insufflation device according to claim 2, wherein said electronic evaluation means has an outlet connected to an auxiliary device, said second signal being applied to the outlet to deactivate the auxiliary device.

5. In an insufflation device according to claim 1, wherein the control means for the switching valve switches the switching valve over to the second position and remains in said second position as long as the flow in the second channel is equal to or approximately equal to zero.

6. In an insufflation device according to claim 5, wherein said first means includes electronic evaluation means for triggering a first signal when the pressure in the body cavity is exceeded by a specific preselected value above said desired, required pressure and said electronic evaluation means triggers a second signal for blocking the gas feed into the body cavity when the pressure in the body cavity exceeds a preselected limiting value greater than said specific preselected value.

7. An insufflation device according to claim 6, wherein said evaluation means maintains the insufflation device in a deactivated condition when the preselectible limiting value has been exceeded until the wrong operation, faulty control action and erroneous handling causing said deactivation has been corrected and eliminated.