Surgery – Instruments – Light application
Patent
1996-01-11
2000-02-22
Shay, David M.
Surgery
Instruments
Light application
606 10, 606 13, 604 21, 600310, 600474, 600477, 600500, A61M 500
Patent
active
060274921
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of creating access to a vein, especially on the human body, whereby at first the skin surface surrounding the vein access area is disinfected, than the epiderm is penetrated and the vein is opened, and finally a part of a cannula is inserted. Further the invention relates to a device for implementing the method.
In order to provide a vein access which is supposed to be used over a longer period of time, usually cannulae of plastic material with a blunt end are used. In order to be able to introduce these--relatively soft--plastic cannulae into the vein common metallic cannulae are used which are inserted into the cannula of plastic material and extend beyond the plastic cannula with their slanted ends. As soon as the plastic cannula is in the desired position inside the vein, the metallic cannula is withdrawn.
The penetration of the epiderm and the opening of the vein by purely mechanical ways can have a negative influence on the provided vein access, so that for instance the latter has to be removed sooner than anticipated, due to occurring infections. This can also have a negative influence on the healing process starting after the removal of the vein access.
It is the object of the invention to improve the method mentioned in the introduction from the medical point of view, and furthermore to make it more agreeable to the patient. Further it is the object of the invention to create a device for implementing this method.
From the method point of view this object is achieved due to the fact that the penetration of the epidermis and/or the opening of the vein is performed with a cutting device working with electromagnetic radiation.
The advantage afforded by the invention consists basically in that the application of electromagnetic radiation already advantageously used in other medical fields, makes possible the cutting of tissues with favorable results and in addition has a positive influence on the subsequent healing.
In a preferred embodiment of the method the wave length of the electromagnetic radiation lies within the range of visible light, respectively within neighboring ranges.
Further the invention provides that the cutting device be at first adjusted by a measuring mechanism selectively reacting to blood vessels and fastened and in its adjusted position fastened to the skin surface. This insures that the vein is reached without the frequent failed attempts which can be seen with the current techniques.
Thereby within the framework of the invention it can be further provided that prior to the use of the cutting device, a locally acting anaesthetic be applied in the area where the epiderm is supposed to be penetrated. A particularly simple handling results when the application of the anaesthetic takes place together with the fastening of the cutting device on the skin surface.
From the device point of view the object of the invention is achieved starting out from a contact piece to be fastened to the skin surface, which has one or more attachment pieces for the connection of syringes, infusion tubes or the like, as well as cannula part through which an access particularly to a vein is created, due to the fact that the contact piece is equipped with a cutting device working with electromagnetic radiation.
This cutting device suitably works with light of high energy in the visible or neighboring ranges. Thereby it has further to be considered advantageous when the cutting device works with monochromatic light.
In a preferred embodiment of the invention the cutting device is formed by a light-conducting element to which a light source is connected. Thereby the light-conducting element can suitably consist of a sleeve which surrounds the cannula part. The sleeve can thereby have one or more optical guide rods.
In a first and very advantageous embodiment of the invention the sleeve part has two optical guide rods, which area diametrically opposed to each other. As a result a linear section can be performed between the two conducting rods.
Also there is the similarly su
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patent: 4929246 (1990-05-01), Sinofsky
patent: 5165418 (1992-11-01), Tankovich
patent: 5275596 (1994-01-01), Long et al.
patent: 5522813 (1996-06-01), Trelles
Arzneimittel GmbH Apotheker Vetter & Ravensburg
Dubno Herbert
Shay David M.
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