Surgery – Diagnostic testing – Flexible catheter guide
Patent
1999-02-16
2000-08-22
O'Connor, Cary
Surgery
Diagnostic testing
Flexible catheter guide
604 96, 604280, A61B 512
Patent
active
061064890
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cable particularly for tracheostomy and retrograde-intubation techniques.
BACKGROUND ART
Conventional nonsurgical or emergency retrograde-intubation and tracheostomy techniques are often based on inserting in the trachea a guiding wire which is inserted through the passage of a needle; dilatation devices are made to slide over said wire, in the case of nonsurgical tracheostomies, or the wire is used as a guiding element for difficult intubations where the tracheal passage is not visible or not easily accessible from the mouth.
The guiding wire being used is substantially provided by means of a spring inside which a steel wire is provided which is folded in a U-like shape at one end, so as to provide a highly flexible element which can be inserted in a needle even in a straight configuration and resume immediately thereafter the U-like shape, which is particularly useful during insertion, since it always tends to regain the axial position and, by being extremely flexible, does not damage-the delicate wall of the trachea.
This guiding wire is capable of meeting only some of the technical requirements encountered, since it does not have a sufficient pulling strength and therefore cannot be used whenever it is necessary to perform traction by means of the guiding wire, for example to perform dilation tracheostomies based on the principle of traction, as shown in Italian patent application No. MI 94 A 001043.
Accordingly, when traction has to be applied, it is necessary to use a cable which is constituted by a steel strand, with the consequent additional aid of a rigid tracheoscope, so as to guide the steel cable.
DISCLOSURE OF THE INVENTION
The aim of the invention is to solve the above problem by providing a cable particularly for tracheostomy or retrograde-intubation techniques which allows to combine the flexibility and maneuverability which are typical of an elastic guiding wire with the pulling-strength characteristics which are typical of a steel cord.
Within the scope of this aim, a particular object of the invention is to provide a cable which, while having considerably improved characteristics, does not have a larger diameter than conventional devices.
Another object of the present invention is to provide a cable which, by means of its particular constructive characteristics, is capable of giving the greatest assurances of reliability and safety in use.
A further object of the present invention is to provide a cable particularly for tracheostomy and retrograde-intubation techniques which can be easily obtained starting from commonly commercially available elements and materials and is also competitive from a merely economical point of view.
This aim, these objects, and others which will become apparent hereinafter are achieved by a cable particularly for tracheostomy and retrograde-intubation techniques, according to the invention, characterized in that it comprises in combination an elastic guiding wire constituted by a steel wire arranged inside a flexible spring and a traction-resistant steel cord which is rigidly connected to said steel wire.
BRIEF DESCRIPTION OF THE DRAWINGS
Further characteristics and advantages of the invention will become apparent from the following detailed description of a cable particularly for tracheostomy and retrograde-intubation techniques, illustrated only by way of non-limitative example in the accompanying drawings, wherein:
FIG. 1 is a schematic view of the cable according to the present invention;
FIG. 2 is a view of the connecting region between the steel cord and the steel wire;
FIG. 3 is a schematic view of the guiding wire, illustrating the steel wire inside the flexible spring;
FIG. 4 is a view of the initial step of the insertion of the guiding wire according to the present invention;
FIG. 5 is a view of the guiding wire inside the trachea;
FIG. 6 is a schematic view of the cable when traction is applied to the cord to insert a dilation element inside the trachea.
WAYS OF CARRYING OUT THE INVENTIO
REFERENCES:
patent: 2118631 (1938-05-01), Wappler
patent: 4244362 (1981-01-01), Anderson
Bergamaschi Paolo
Gibertoni Lucio
Limpus Lawrence L.
Mallinckrodt Inc.
O'Connor Cary
Wingood Pamela L.
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