Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS2463149 A
Publication typeGrant
Publication dateMar 1, 1949
Filing dateNov 24, 1947
Priority dateNov 24, 1947
Publication numberUS 2463149 A, US 2463149A, US-A-2463149, US2463149 A, US2463149A
InventorsCaine Curtis W
Original AssigneeCaine Curtis W
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Endotracheal intubating stylet
US 2463149 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

March 1, 1949.- c, w. c l E ENDOTRACHEAL INTUBATING STYLET Filed Nov. 24, 1947 IN VEN TOR.

Patented Mar. 1,1949


The present invention relates to a stylet adapted for use with an endotraoheal tube or catheter to facilitate insertion of the latter into the trachea.

As endotracheal tubes or catheters are usually made of soft flexible rubber or the like, it is very difficult to direct the, same between the vocal chords. In order to effectively overcome this difficulty, I provide an improved stylet adapted to be inserted in the tube to stiffen it and to anteriorly curve and distend its distal end into a laterally flattened cross sectional form substantially resembling the shape of the laryngeal opening. When the tube is thus conditioned, intubation may be accomplished with facility and speed.

To facilitate manipulation of the device during intubation and to fix the tube in proper relation to the stylet regardless of the length of the tube,

the stylet includes a relatively long stiff wire or rod having an elongated handle slidably adjustable on its proximal portion. The distal end of the handle is reduced to make a close sliding fit within the proximal end of the tube or within the usual coupling member which may be provided on the proximal end of the tube for use in connecting it to the control valve of apparatus used to supply oxygen or other gas to the lungs through the inserted tube. The distal portion of the wire or rod is gradually curved anteriorly and is composed of forwardly diverging spring arms adapted to distend antero-posteriorly and flatten laterally the corresponding portion of the tube.

The exact nature of the present invention will become apparent from the following description when considered in connection with the accompanying drawings, in which:

Figure 1 is side elevational view, partly broken away, of a stylet constructed in accordance with the present invention.

Figure 2 is a central longitudinal section, partly broken away, of the stylet of Figure 1 operatively associated with an endotracheal tube or catheter.

Figure 3 is a transverse section taken on line 3-3 of Figure 2.

Figure 4 is a transverse section taken on line 4-4 of Figure 2.

The present stylet is adapted for use in connection with a conventional endotracheal tube or catheter 5 which has a port 6 through the distal end thereof, and which is shown as provided at its proximal end with the usual coupling member I for use in connecting the tube or catheter to the control valve of apparatus commonly used to supply oxygen or other gas to the lungs through the tube when the latter is inserted into the trachea. This tube orcatheter is made of soft flexible rubber or the like, so that without a stylet it is difficult to direct the same between the vocal chords.

In order to facilitate insertion of the tube or catheter, I have provided an improved stylet which includes a relatively long stiff wire or rod t, the major portion of which is straight, and the remaining distal portion 9 of which is gradually curved anteriorly. The rod 8 is somewhat longer than the longest type of endotracheal tube, and the distal end portion thereof is composed of a pair of forwardly diverging spring arms lil having inturned free forward ends H. The arms it are normally tensioned to spring apart in such relation that they will flatten the distal portion of the tube 5 when disposed within the same as shown in Figure 2, thereby giving this portion of the tube a cross sectional form substantially resembling the shape of the laryngeal opening. The stylet further includes an elongated handle [2 having an axial bore 53 through which the rod 8 slidably extends. Thus, the handle i2 is slidably adjustable on the proximal portion of the rod 8, and it is provided with a set screw M which may be tightened into engagement with the rod 8 to secure the handle in adjusted position. As seen in Figure 4, the rod 8 is flattened at one side so that when it is impinged by the set screw M, relative rotation of the rod 8 and handle I2 is prevented. It will be seen that the distal end of handle i2 is reduced to provide a cylindrical portion l5 adapted to make a close sliding fit within the coupling member I and thereby effectively connect the proximal end of the tube with the handle so that they will not freely turn relative to each other. The reduced end portion i5 is provided with a tapered extension it which gradually reduces in diameter forwardly and acts to guide the coupling member 1 or the end of a tube not provided with such a coupling, onto the reduced end portion l5.

In using the present stylet, the parts thereof are lubricated to facilitate insertion of the same into the tube 5. Such insertion is carried out so that the distal ends I l of the arms It are located a slight distance inwardly of the open distal end of the tube 5 as shown in Figure 2. The handle [2 is then slid forwardly on rod 8 so as to enter the reduced portion l5 of the handle within the coupling l as shown. The set screw [4 is then tightened so as to secure the handle in this properly adjusted position, and it will be apparent that the degree of adjustment of the handle l2 which is necessary will depend upon the particular length of the tube 5 being employed. In Figure 3 the manner in which the arms distend and flatten the distal portion of the tube 5 will be apparent. After externally lubricating the tube 5, the assembly of Figure 2 will be held in one hand by grasping the handle I2 in a manner similar to that in. which an ordinary pencil is held while writing. The tube 5,, thus conditioned, may then be readily inserted into the trachea, no difficulty being experienced in directing the tube between the vocal chords. When intubation has been properly accomplished, the stylet is withdrawn from the tube, and the latter may then be coupled to the associated apparatus for supplying oxygen or other gas to the lungs through the inserted tube.

It will be understood that changes in the details herein described and illustrated may be made by tthose skilled in the art without departing from the spirit and scope of the invention as claimed.

:bored handle slidably adjustable on the proximal portion of said rod and' having a reduced distal portion adapted to make a close sliding fit Within the proximal end of the tube, the distal portion of the rod being composed of a pair of forwardly diverging spring arms tensioned to spring apart REFERENCES CITED The following references are of record in the file --of this patent:

UNITED STATES PATENTS Name Date Wappler, May 24, 1938 .Kleine July ,4, 1939 FOREIGN PATENTS Number Number Country flDate France Jan=. 18, 1906 France -LNOVQ 4, 1913 France -"Jan. 27',' 1921 OTHER REFERENCES Page 42 of Catalogue Catheters,=by- Anode, published in 1938 by :American Cystoscope Makers, 450-Whitlock Avenue, New' i lork city, New York.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2118631 *Apr 3, 1935May 24, 1938Charles Wappler FrederickCatheter stylet
US2164926 *Jun 2, 1936Jul 4, 1939American Cystoscope Makers IncCatheter stylet
FR357892A * Title not available
FR459391A * Title not available
FR512640A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3867945 *May 14, 1973Feb 25, 1975Wendell M LongCatheter stylets
US4166467 *Aug 8, 1977Sep 4, 1979Metatech CorporationBite block for endotracheal tube
US4449522 *May 7, 1982May 22, 1984Dragerwerk A.G.Positioning device for use with a tracheal tube which is insertable into a person's trachea for respiration purposes
US4659328 *Mar 12, 1984Apr 21, 1987Biosearch Medical Products, Inc.For stiffening a pliable infusion tube
US4949716 *Nov 28, 1989Aug 21, 1990Medical Devices, Inc.Nasal intubation adjunct
US5058577 *May 9, 1989Oct 22, 1991Gary SixFlexible tip stylet for use with an endotracheal intubation device
US5111829 *Jan 18, 1991May 12, 1992Boston Scientific CorporationSteerable highly elongated guidewire
US5507279 *Nov 30, 1993Apr 16, 1996Fortune; John B.Retrograde endotracheal intubation kit
US5791341 *Dec 18, 1996Aug 11, 1998Bullard; James RogerOropharyngeal stent with laryngeal aditus shield and nasal airway with laryngeal aditus shield
US5850832 *Jun 23, 1997Dec 22, 1998Chu; Kyo Y.Into the throat of a patient
US6463927 *Mar 11, 1998Oct 15, 2002Smiths Group PlcMedical tube assemblies
US6651665 *Feb 19, 2002Nov 25, 2003Ibionics, Inc.Rotating magnetic guide intubation system
US6672305 *Feb 26, 2001Jan 6, 2004Parker Medical Limited PartnershipShallow throat orotracheal intubation guide
US6701918 *Aug 27, 2002Mar 9, 2004Ibionics CorporationMagnetically guided device for insertion through a nasal passageway
US6715491 *Jul 29, 2002Apr 6, 2004Ibionics CorporationMagnetically orienting laryngeal elevator blade
US6820614 *Dec 2, 2000Nov 23, 2004The Bonutti 2003 Trust -ATracheal intubination
US7320319Nov 17, 2004Jan 22, 2008Marctec, LlcMedicant delivery system and method
US7552729 *Mar 1, 2002Jun 30, 2009The United States Of America As Represented By The Secretary Of The ArmyIntubation device and method
US8642948 *Sep 11, 2009Feb 4, 2014Thermo Fisher Scientific (Bremen) GmbhIon trap for cooling ions
US8746239Jul 18, 2007Jun 10, 2014Douglas K. YoshidaExtendable lighted intubation stylet
US20090050146 *Aug 14, 2008Feb 26, 2009The Cleveland Clinic FoundationApparatus and method for intubating an airway of a patient
US20110163227 *Sep 11, 2009Jul 7, 2011Makarov Alexander AIon Trap for Cooling Ions
USRE35595 *Oct 21, 1993Aug 26, 1997Six; GaryFlexible tip stylet for use with an endotracheal intubation device
DE3334546A1 *Sep 23, 1983Mar 29, 1984Viridian IncFuehrungssonde fuer eine schlauchanordnung zum einleiten und absaugen von fluiden in und aus dem magendarmtrakt eines patienten
U.S. Classification128/200.26
International ClassificationA61M23/00, A61M16/04
Cooperative ClassificationA61M16/0488, A61M25/09
European ClassificationA61M16/04M