Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1987-04-29
1989-01-17
Truluck, Dalton L.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
128DIG26, 604274, A61M 532
Patent
active
047985950
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an injection arrangement.
During injection with a conventional needle, the needle is introduced through the skin into the area of the tissue where the drug is to be deposited. In the case of subcutaneous injections (in the subcutaneous area) the fat cells are torn apart, leading to subsequent chemical inflammation. Furthermore a conventional needle, when used as an in situ needle for the continuous or repeated administration of drugs, suffers from the disadvantage that the tip of the needle is not securely anchored, but is able as a result of vertical and lateral movements to destroy surrounding cells. Fats are released in conjunction with the destruction of fat cells, and this in turn leads to inflammatory reactions around the tip of the needle. If a catheter, for example a subcutaneous catheter made of a plastics material, is used instead, the risk of infection will be created when the insertion sleeve passes down into underlying tissue.
In conjunction with injections performed by means of previously disclosed injection arrangements, the entire dose of the drug is deposited at the tip of the needle. A number of drugs have an irritative effect, in particular if the drug is deposited in a large quantity.
The object of the present invention is to make available an injection arrangement in which the above-mentioned disadvantages have been eliminated or at least reduced, and by means of which the injection can be performed with great accuracy with regard to the depth of the injection. This is achieved in accordance with the invention in that the arrangement comprises an injection needle which is curved so that at least one part of it exhibits a circular art with a certain radius of curvature, and which is executed at one end with a solid, cutting tip, has a central duct which is closed in the area ahead of the tip of the needle, and along the area in the form of a circular arc has a number of openings communicating with the duct, and a base plate in which there are present two curved ducts passing through the plate at an angle to one another and with the same radius of curvature as the needle, in that the base plate supports a cradle, to which the needle is attached, and in that the needle is able to move in a normal plane to the plane of the base plate in a reciprocating fashion about the centre of the radius of curvature, in conjunction with which, during forward movement of this kind, the tip of the needle moves from a first end position down through the first curved duct and then up through the second duct to a second end position.
A cutting tip on straight injection needles is previously disclosed in, for example, U.S. Pat. Nos. 2,989,053 and 3,509,880. In conjunction with the insertion of the needle, the cutting tip causes less irritation and less destruction of cells than is the case with conventional injection needles. The fact that the drug is distributed through a number of holes results in the advantage that it is distributed over a larger area, which not only facilitates the resorption of the drug in question, but also reduces the quantity of the drug at a given point and with it the risk of irritations.
As the needle is inserted, the tip of the needle penetrates the skin twice and is secured above the area of the skin. This means reduced destruction of cell tissue and less pain, since the needle is securely anchored with its tip outside the tissue. The fact that the needle is secured also reduces the risk of infections at the point of entry by the needle. The possibility is thus afforded of leaving the needle in place for a considerably longer period than is the case with previously disclosed injection arrangements, which is of major importance to, for example, diabetics and long-term care patients.
BRIEF DESCRIPTION OF THE DRAWING
The invention is described below in more detail with reference to the accompanying drawing, in which
FIG. 1 shows in perspective view an illustrative embodiment of an injection needle in an arrangement in accordance with the inventio
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Andersson Ingvar
Wadstein Jan
Jeffers Albert L.
Truluck Dalton L.
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