Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Reexamination Certificate
2002-09-30
2003-12-30
Lo, Weilun (Department: 3761)
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
C128S204180
Reexamination Certificate
active
06668829
ABSTRACT:
FIELD OF THE INVENTION
The invention relates generally to the field of medical ventilators or, more specifically, to the control of such ventilators.
BACKGROUND OF THE INVENTION
A medical ventilator delivers gas to a patient's respiratory tract and is often required when the patient is unable to maintain adequate ventilation. Mechanical ventilation is the single most important therapeutic modality in the care of critically ill patients. Known ventilators typically include a pneumatic system that delivers and extracts gas pressure, flow and volume characteristics to the patient and a control system (typically consisting of knobs, dials and switches) that provides the interface to the treating clinician. Optimal support of the patient's breathing requires adjustment by the clinician of the pressure, flow, and volume of the delivered gas as the condition of the patient changes. Such adjustments, although highly desirable, are difficult to implement with known ventilators because the control system demands continuous attention and interaction from the clinician.
Further, patients requiring ventilatory assistance must overcome airway resistance in the breathing circuit during exhalation. This resistance, combined with the stiffness of the lungs and the thoracic cage under certain pathological conditions, imposes a significant workload upon a patient whose reserves may already be compromised by underlying disease processes.
SUMMARY OF THE INVENTION
The invention relates to a medical mechanical ventilator device adapted for use in weaning a patient from mechanical ventilation. In one embodiment, the device measures the patient's minute volume, breath frequency, and detects a patient's spontaneous breath. The device compares the patient's minute volume and the patient breath rate to a predetermined minute volume and a predetermined breath rate entered by a clinician. In a pressure support mode, the device decreases patient pressure support level if the patient's spontaneous breathing rate falls within the predetermined range of breathing and the patient's minute volumeexceeds the predetermined minute volume. In one embodiment, the patient's spontaneous breathing rate and the patient's minute volume is determined on a breath-by-breath basis. For the purposes of this invention, intrabreath is defined as within the period of one breath cycle, and interbreath is defined as within the period of at least two breaths.
In another embodiment, the invention is a ventilator system adapted for use in weaning a patient from mechanical ventilation. The ventilator system comprises a pressure source in communication with the patient's respiratory system to provide pressure support to the patient. The device further comprises a breath frequency monitor, a minute volume flow meter, an input device, and a data processing unit. The data processing unit compares the patient's breathing frequency and patient's minute volume to the breathing frequency and minute volume entered by the clinician. Pressure support is adjusted by the ventilator on an intrabreath or interbreath basis.
REFERENCES:
patent: 3212496 (1965-10-01), Preston
patent: 3741208 (1973-06-01), Jonsson et al.
patent: 3835845 (1974-09-01), Maher
patent: 3923055 (1975-12-01), Hammacher
patent: 3961627 (1976-06-01), Ernst et al.
patent: 3972327 (1976-08-01), Ernst et al.
patent: 3976064 (1976-08-01), Wood et al.
patent: 4016871 (1977-04-01), Schiff
patent: 4036221 (1977-07-01), Hillsman et al.
patent: 4050458 (1977-09-01), Friend
patent: 4141356 (1979-02-01), Smargiassi
patent: 4163450 (1979-08-01), Kirk et al.
patent: 4176663 (1979-12-01), Hewlett
patent: 4204524 (1980-05-01), Martin et al.
patent: 4256100 (1981-03-01), Levy et al.
patent: 4281651 (1981-08-01), Cox
patent: 4323064 (1982-04-01), Hoenig et al.
patent: 4340044 (1982-07-01), Levy et al.
patent: 4413632 (1983-11-01), Schlessinger et al.
patent: 4417573 (1983-11-01), De Vries
patent: 4424806 (1984-01-01), Newman et al.
patent: 4444201 (1984-04-01), Itoh
patent: 4448192 (1984-05-01), Stawitcke et al.
patent: 4456008 (1984-06-01), Clawson et al.
patent: 4459982 (1984-07-01), Fry
patent: 4546770 (1985-10-01), Schlessinger et al.
patent: 4637385 (1987-01-01), Rusz
patent: 4676232 (1987-06-01), Olsson et al.
patent: 4838257 (1989-06-01), Hatch
patent: 4840167 (1989-06-01), Olsson et al.
patent: 4877023 (1989-10-01), Zalkin
patent: 4917080 (1990-04-01), Bayerlein
patent: 4928674 (1990-05-01), Halperin et al.
patent: 4984158 (1991-01-01), Hillsman
patent: 4986268 (1991-01-01), Tehrani
patent: 4990894 (1991-02-01), Loescher et al.
patent: 5020516 (1991-06-01), Biondi et al.
patent: 5040529 (1991-08-01), Zalkin
patent: 5072737 (1991-12-01), Goulding
patent: 5092326 (1992-03-01), Winn et al.
patent: 5097424 (1992-03-01), Ginevri et al.
patent: 5103814 (1992-04-01), Maher
patent: 5107831 (1992-04-01), Halpern et al.
patent: 5129390 (1992-07-01), Chopin et al.
patent: 5161525 (1992-11-01), Kimm et al.
patent: 5183038 (1993-02-01), Hoffman et al.
patent: 5188098 (1993-02-01), Hoffman et al.
patent: 5271389 (1993-12-01), Isaza et al.
patent: 5299568 (1994-04-01), Forare et al.
patent: 5303698 (1994-04-01), Tobia et al.
patent: 5303699 (1994-04-01), Bonassa et al.
patent: 5309919 (1994-05-01), Snell et al.
patent: 5316009 (1994-05-01), Yamada
patent: 5319540 (1994-06-01), Isaza et al.
patent: 5323772 (1994-06-01), Linden et al.
patent: 5331995 (1994-07-01), Westfall et al.
patent: 5373842 (1994-12-01), Olsson et al.
patent: 5377671 (1995-01-01), Biondi et al.
patent: 5383449 (1995-01-01), Forare et al.
patent: 5390666 (1995-02-01), Kimm et al.
patent: 5400777 (1995-03-01), Olsson et al.
patent: 5402796 (1995-04-01), Packer et al.
patent: 5419314 (1995-05-01), Christopher
patent: 5429123 (1995-07-01), Shaffer et al.
patent: 5433193 (1995-07-01), Sanders et al.
patent: 5438980 (1995-08-01), Phillips
patent: 5515844 (1996-05-01), Christopher
patent: 5520192 (1996-05-01), Kitney et al.
patent: RE35295 (1996-07-01), Estes et al.
patent: 5535738 (1996-07-01), Estes et al.
patent: 5540233 (1996-07-01), Larsson et al.
patent: 5549106 (1996-08-01), Gruenke et al.
patent: 5551418 (1996-09-01), Estes et al.
patent: 5558086 (1996-09-01), Smith et al.
patent: 5596984 (1997-01-01), O'Mahony et al.
patent: 5598838 (1997-02-01), Servidio et al.
patent: 5630411 (1997-05-01), Holscher
patent: 5632270 (1997-05-01), O'Mahony et al.
patent: 5660171 (1997-08-01), Kimm et al.
patent: 5664563 (1997-09-01), Schroeder et al.
patent: 5692497 (1997-12-01), Schnitzer et al.
patent: 5740796 (1998-04-01), Skog
patent: 5743253 (1998-04-01), Castor et al.
patent: 5806513 (1998-09-01), Tham et al.
patent: 5862802 (1999-01-01), Bird
patent: 5868133 (1999-02-01), DeVries et al.
patent: 5875777 (1999-03-01), Eriksson
patent: 5878744 (1999-03-01), Pfeiffer
patent: 5881723 (1999-03-01), Wallace et al.
patent: 5915380 (1999-06-01), Wallace et al.
patent: 5915381 (1999-06-01), Nord
patent: 5918597 (1999-07-01), Jones et al.
patent: 5921920 (1999-07-01), Marshall et al.
patent: 5927274 (1999-07-01), Servidio et al.
patent: 5931159 (1999-08-01), Suzuki et al.
patent: 5931160 (1999-08-01), Gilmore et al.
patent: 5931162 (1999-08-01), Christian
patent: 5937853 (1999-08-01), Strom
patent: 5957130 (1999-09-01), Krahbichler et al.
patent: 6000396 (1999-12-01), Melker et al.
patent: 6015388 (2000-01-01), Sackner et al.
patent: 6024089 (2000-02-01), Wallace et al.
patent: 6029664 (2000-02-01), Zdrojkowski et al.
patent: 6076523 (2000-06-01), Jones et al.
patent: 6095139 (2000-08-01), Psaros
patent: 6158432 (2000-12-01), Biondi et al.
patent: 6305372 (2001-10-01), Servidio
patent: 6370419 (2002-04-01), Lampotang et al.
patent: 6390091 (2002-05-01), Banner et al.
patent: 6463930 (2002-10-01), Biondi et al.
patent: 6526970 (2003-03-01), DeVries et al.
patent: 2 348 582 (1973-11-01), None
patent: 0 182 722 (1986-05-01), None
patent: 0 342 433 (1988-05-01), None
patent: 0 274 996 (1988-07-01), None
patent: 0 993 841 (2000-04-01), None
patent: 2729084 (1995-12-01), None
patent: 2 16
Biondi James W.
Lockhorn Nancy
Reynolds Robert
Cardiopulmonary Corporation
Lo Weilun
Mitchell Teena
Testa Hurwitz & Thibeault LLP
LandOfFree
System for automatically weaning a patient from a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for automatically weaning a patient from a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for automatically weaning a patient from a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3165915