Laryngeal mask airway

Details Laryngeal mask airway Laryngeal mask airway

2001-04-23

2003-10-21

Lo, Weilun (Department: 3761)

Surgery

Respiratory method or device

Means placed in body opening to facilitate insertion of...

C128S207140, C128S207130

Reexamination Certificate

active

06634354

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to the field of laryngeal mask airways. More specifically, the present invention discloses an intubation guide and laryngeal mask that can be used to simultaneously intubate and ventilate a patient.
2. Background of the Invention
Endotracheal tubes are also used in semi-emergency situations to ventilate patients with respiratory failure who may be conscious or semi-conscious. The conventional approach requires the patient to lie still while the physician inserts a rigid laryngoscope blade into the patient's mouth and trachea. Delivery of ventilation and/or oxygen is also interrupted during this period. The endotracheal tube is then inserted into place while the laryngoscope blade keeps the patient's airway open. Successful intubation depends on the patient being cooperative and completely relaxed, which unfortunately is often not the case. Even with a cooperative patient, intubation is very uncomfortable and can cause the patient to panic due to the difficulty in breathing during the procedure. This procedure can also result in a choking or gagging response that can cause the patient to regurgitate and aspirate contents from the stomach. One conventional response to these shortcomings has been to sedate the patient during intubation. Tranquilizers make the patient more cooperative and less likely to choke during intubation, but also tend to suppress the patient's breathing and blood pressure. These side effects may be unacceptable when dealing with a patient who already suffers from shallow or irregular breathing or depressed blood pressure. Therefore, a need exists for an improved device to guide insertion of an endotracheal tube and ensure that the patient's airway is open, and that also allows the patient to continue to receive air/oxygen during the insertion process.
Laryngeal masks have also been used for many years for several purposes. For example, laryngeal mask airways have been used to ventilate patients while preventing aspiration of secretions or stomach contents into the lungs. Some types of intubation guides include a laryngeal mask to seal the laryngeal inlet while directing the endotracheal tube into position through the larynx.
3. Prior Art
The prior art in the field includes the following:
U.S. Pat. No.
Inventor
4,240,417
Holever
4,351,328
Bodai
4,416,273
Grimes
4,509,514
Brain
4,848,331
Northway-Meyer
4,995,388
Brain
5,197,463
Jeshuran
5,241,956
Brain
5,249,571
Brain
5,282,464
Brain
5,297,547
Brain
5,303,697
Brain
5,305,743
Brain
5,391,248
Brain
5,355,879
Brain
5,584,290
Brain
5,632,271
Brain
5,642,726
Owens et al.
5,682,880
Brain
5,711,293
Brain
5,771,889
Pagan
5,871,012
Neame et al.
5,878,745
Brain
5,881,726
Neame et al.
5,890,488
Burden
5,896,858
Brain
5,937,860
Cook
5,979,445
Neame et al.
5,983,897
Pagan
6,012,452
Pagan
6,050,264
Greenfield
6,055,984
Brain
6,079,409
Brain
6,116,243
Pagan
Holever discloses an adaptor to connect a ventilator to an endotracheal tube, while also permitting insertion of a suction tube.
Bodai discloses a system for simultaneous ventilation and endotracheal suctioning of a patient.
Grimes discloses a connector valve assembly for endotracheal tubes.
The Brain '514 patent discloses a laryngeal mask with a generally elliptical shape and a guide tube.
Northway-Meyer discloses a face mask and intubation guide, which includes a connector for ventilation through the face mask and intubation guide.
Brain '388 patent discloses a laryngeal mask with a soft flexible collar surrounding the lumen of the mask, and also having a drainage tube.
Jeshuran discloses a face mask and adaptor for endotracheal intubation.
The Brain '956 patent discloses a laryngeal mask airway with concentric drainage for esophageal discharge.
The Brain '571 patent discloses a laryngeal clamp airway.
The Brain '464 patent discloses a combined laryngeal mask and reflectance oximeter.
The Brain '547 patent discloses a laryngeal mask with an inflatable cuff and a V-shaped posterior side.
The Brain '697 patent discloses a laryngeal mask with a rigid handle at the proximal end of the guide tube.
The Brain '743 and '248 patents disclose a molding process for producing laryngeal masks.
The Brain '879 patent discloses a laryngeal mask with inflatable ring and inflatable back cushion.
The Brain '290 patent discloses a laryngeal mask with electrodes.
The Brain '271 patent discloses a laryngeal mask with a gastric drainage feature.
The Brain '880 patent discloses a laryngeal mask with a removable stiffener that can be attached to the guide.
The Brain '293 patent discloses a forming tool for deflating a laryngeal mask, such as that shown in the Brain '547 patent, prior to insertion.
The Pagan '889 patent discloses a mask assembly having an inflatable ring and a diaphragm attached to a backing plate.
The '012 patent to Neame et al. discloses a laryngeal mask with an inflatable bag.
The Brain '745 patent discloses a gastro-laryngeal mask with an inflatable cuff and a back cushion to engage the back wall of the pharynx.
The '726 patent to Neame et al. discloses a laryngeal mask with a cuff formed by interlocking ribs.
Burden discloses a coupling device for placing a stethoscope and an endotracheal tube in gaseous communication.
The Brain '858 patent discloses a laryngeal mask with a hinged bar to elevate the epiglottis.
Cook discloses a laryngeal mask with an inflatable toroidal peripheral portion having a recessed front notch.
The '445 patent to Neame et al. discloses a method for manufacture of a laryngeal mask in which the edges of the cuff are heat-sealed.
The Pagan '897 patent discloses a laryngeal mask with cuffs attached on both sides of a plate. The plate also forms a leading tip.
The Pagan '452 patent discloses a laryngeal mask with an air line extending to a foam cuff. The cuff can be compressed for insertion by applying suction to the air line.
Greenfield discloses a laryngeal mask requiring an obdurator inserted into the tube.
The Brain '984 patent discloses an endotracheal tube having tapered, closed nose with a triangular cross-section and lateral openings.
The Brain '409 patent discloses a laryngeal mask having a specific geometry for the guide tube and mask.
The Pagan '243 patent discloses a laryngeal mask with a plate separating two separate semi-annular cuffs bonded to opposite sides of the plate.
4. Solution to the Problem
None of the prior art references discussed above teaches or suggests a laryngeal mask airway that enables the patient to continue to be ventilated while being intubated. This system allows the endotracheal tube to be inserted and connected to a ventilator without interrupting the flow of air/oxygen to the patient's lungs.
SUMMARY OF THE INVENTION
This invention provides a laryngeal mask airway having a curved tubular guide for insertion through the patient's mouth and oropharynx. After insertion of the guide, the beveled distal opening of the guide abuts the laryngeal inlet, while the guide's proximal opening remains outside the patient's mouth. A laryngeal mask surrounds the distal opening of the guide to substantially seal the laryngeal inlet about the distal opening of the guide. A ventilation port adjacent to the proximal opening of the guide supplies a flow of air/oxygen through the guide into the patient's lungs. An endotracheal tube can then be advanced along the length of guide and through the patient's larynx without interrupting ventilation.
These and other advantages, features, and objects of the present invention will be more readily understood in view of the following detailed description and the drawings.


REFERENCES:
patent: 4240417 (1980-12-01), Holever
patent: 4327720 (1982-05-01), Bronson et al.
patent: 4351328 (1982-09-01), Bodai
patent: 4369991 (1983-01-01), Linder
patent: 4416273 (1983-11-01), Grimes
patent: 4509514 (1985-04-01), Brain
patent: 4832020 (

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