Patent US3736311A successfully refreshed from Google Patents.
US5439441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical insufflation system with improved determination of body cavity pressure
Assignee: SNOWDEN-PENCER Inc
•
Filing: 1993-10-12
•
Granted: 1995-08-08
•
Expires: 2013-10-12
Abstract
Abstract Insufflation gas is introduced into a body cavity to be inflated. The gas flow is stopped, and the pressure in the body cavity is measured at plural, discrete intervals of time. Pressure reading values are stored in memory for a predetermined number n of the most recent pressure reading values. These stored pressure reading values are compared to one another to determine the pressure differential between the highest and lowest pressure values. New pressure readings are continually made at the time intervals, and the new pressure reading values replace the oldest pressure readings such that the most recent pressure reading values are stored in memory. Pressure measurements are continued if the maximum pressure differential in the predetermined number n of the most recent stored pressure reading values is less than the predetermined pressure differential. However, if the differential is less than a predetermined pressure differential, then it is determined that the pressure oscillations in the body cavity have subsided, and the nominal body cavity pressure is determined. If the measured pressure is below a preset target level of insufflation, additional gas may be introduced into the body cavity, and then pressure measurements may be resumed.
Inventors
- 👤 Richard L. Grimsley
- 👤 Steven N. Carlisle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:53
CPC Classifications
A; A61; A61M; A61M13/00; A61M13/003
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
128 words
A process for supplying insufflation gas to inflate a body cavity of a patient during an endoscopic procedure, comprising the steps of: supplying insufflation gas into the body cavity; discontinuing the supply of gas into the body cavity; measuring pressure in communication with the body cavity to obtain pressure reading values taken at plural discrete intervals of time when no gas is being introduced into the body cavity to obtain a plurality of pressure reading values; storing a plurality of said pressure reading values; comparing a predetermined number n of the most recent pressure reading values to determine the pressure differential between a highest and a lowest pressure reading value therein; determining a nominal body cavity pressure when said pressure differential becomes less than a predetermined pressure differential.
Claim 2
Dependent Claim
128 words
A process for supplying insufflation gas to inflate a body cavity of a patient during an endoscopic procedure, comprising the steps of: supplying insufflation gas into the body cavity; discontinuing the supply of gas into the body cavity; measuring pressure in communication with the body cavity to obtain pressure reading values taken at plural discrete intervals of time when no gas is being introduced into the body cavity to obtain a plurality of pressure reading values; storing a plurality of said pressure reading values; comparing a predetermined number n of the most recent pressure reading values to determine the pressure differential between a highest and a lowest pressure reading value therein; determining a nominal body cavity pressure when said pressure differential becomes less than a predetermined pressure differential.
Claim 3
Dependent Claim
16 words
A process according to claim 1, wherein the pressure is measured by an electronic pressure transducer.
Claim 4
Dependent Claim
16 words
A process according to claim 1, wherein the discrete intervals of time are about 0.5 milliseconds.
Claim 5
Dependent Claim
19 words
A process according to claim 1, wherein the predetermined number n of pressure reading values is at least 10.
Claim 6
Dependent Claim
16 words
A process according to claim 4, wherein the number n of pressure reading values is 32.
Claim 7
Dependent Claim
16 words
A process according to claim 1, wherein the predetermined pressure differential is about 1 mm Hg.
Claim 8
Dependent Claim
30 words
A process according to claim 1, wherein the step of determining nominal body cavity pressure is performed by averaging a predetermined number n' of the most recent pressure reading values.
Claim 9
Dependent Claim
12 words
A process according to claim 7, wherein n' is less than n.
Claim 10
Dependent Claim
20 words
A process according to claim 1, further including the step of indicating the nominal body cavity pressure on a display.
Claim 11
Dependent Claim
35 words
A process according to claim 1, wherein the measuring step is performed at least eight times, and the last eight pressure reading values stored in memory are averaged to determine the nominal body cavity pressure.
Claim 12
Dependent Claim
33 words
A process according to claim 1, further including the step of resuming the supply of gas into the body cavity when the nominal body cavity pressure is less than a target pressure value.
Claim 13
Dependent Claim
127 words
Insufflation apparatus for supplying insufflation gas to inflate a body cavity of a patient during an endoscopic procedure, comprising: supply means for supplying insufflation gas into said body cavity; control means for controlling the pressure in the body cavity, said control means including pressure measuring means in communication with the body cavity for providing pressure reading values taken at discrete intervals of time when no gas is being introduced into the body cavity; memory means for storing said pressure reading values; means for comparing a number n of the most recent pressure reading values to determine the differential between a highest and a lowest pressure reading value therein; and, means for determining a nominal body cavity pressure when said differential becomes less than a predetermined pressure differential.
Claim 14
Dependent Claim
127 words
Insufflation apparatus for supplying insufflation gas to inflate a body cavity of a patient during an endoscopic procedure, comprising: supply means for supplying insufflation gas into said body cavity; control means for controlling the pressure in the body cavity, said control means including pressure measuring means in communication with the body cavity for providing pressure reading values taken at discrete intervals of time when no gas is being introduced into the body cavity; memory means for storing said pressure reading values; means for comparing a number n of the most recent pressure reading values to determine the differential between a highest and a lowest pressure reading value therein; and, means for determining a nominal body cavity pressure when said differential becomes less than a predetermined pressure differential.
Claim 15
Dependent Claim
16 words
Insufflation apparatus according to claim 12, wherein the pressure measuring means includes an electronic pressure transducer.
Claim 16
Dependent Claim
21 words
Insufflation apparatus according to claim 12, wherein the pressure measuring means provides pressure reading values at intervals of about 0.5 millisecond.
Claim 17
Dependent Claim
20 words
Insufflation apparatus according to claim 12, wherein the number n of the most recent pressure values is at least 10.
Claim 18
Dependent Claim
13 words
Insufflation apparatus according to claim 15, wherein the value of n is 32.
Claim 19
Dependent Claim
16 words
Insufflation apparatus according to claim 12, wherein the predetermined pressure differential is about 1 mm Hg.
Claim 20
Dependent Claim
31 words
Insufflation apparatus according to claim 12, wherein the means for determining the nominal body cavity pressure calculates an average of a predetermined number n' of the most recent pressure reading values.
Claim 21
Dependent Claim
12 words
Insufflation apparatus according to claim 18, wherein n' is less than n.
Claim 22
Dependent Claim
52 words
Insufflation apparatus according to claim 12, including means for indicating the nominal body cavity pressure, said indicating means being selected from the group consisting of: a light emitting diode display, a liquid crystal display, an analog needle gauge display, a computer screen, a paper printout, and an ink and pen tracing display.
Claim 23
Dependent Claim
32 words
Insufflation apparatus according to claim 12, further including means for resuming the supply of gas into the body cavity when the nominal body cavity pressure becomes less than a predetermined target pressure.
References Cited (Backward Citations)
US4676774A
Cited
US4874362A
Cited
US4966578A
Cited
US5013294A
Cited
US5047010A
Cited
US5246419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-07 | 1999-02-06 | 1999-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-07 | 2003-02-06 | 2003-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-07 | 2007-02-06 | 2007-08-08 | $7700.00 | Window Closed / Lapsed |