Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1989-02-07
1990-09-18
Kruter, J. L.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604104, 604171, 604176, A61M 2900
Patent
active
049574850
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention related to an arrangement for the instillation of fluids in a urethra comprising a tube of appropriate rigidity and diameter to be capable of being introduced into the urethra, which tube exhibits at its one end a device for the attachment of the tube to a source of the aforementioned fluid.
One disadvantage of previously disclosed instillation arrangements is that it is difficult to achieve a good seal between the opening of the urethra and the instillaton tube. This is unsatisfactory, especially in conjunction with the instillation of cytotoxic drugs, whose leakage can cause harm to the medical and nursing staff.
Furthermore, in previously disclosed instillation arrangements, the tube is often so long that, when it has been introduced, it reaches as far as or into the vicinity of the bladder. In this way those bacteria which are normally washed away during urination are able to make their way undisturbed up through the urethra in the space between it and the tube. The result of this is infections, which means that the instillation treatment must be interrupted, to be resumed at a later date once the infection has been arrested, which is unnecessarily painful for the patient and reduces the effectiveness of the treatment.
A further disadvantage associated with the length of the instillation tube in previously disclosed arrangements is the fact that crystals frequently form in the aforementioned space between the instillation tube and the wall of the urethra, against which the crystals chafe, causing pain and a propensity to infection.
SUMMARY OF THE INVENTION
The object of the present invention is to make available an instillation arrangement in which the aforementioned disadvantages have been eliminated, this being made possible in that the length of the tube is a fraction of the length of the urethra, or approximately one decimeter, in that the tube is executed along most of its length with an inflatable sac with elastic walls, which sac exhibits straight cylindrical form in its uninflated state and is so arranged, when in the inflated state, as to adopt a slim, conical form, the base of which is situated at the end of the tube which is intended to be introduced, and the tip of which is attached to a flange anchored to the aforementioned device and in the vicinity thereof is provided with a connection via which the sac can be inflated with and emptied of air, and in that the aforementioned device has a form which is adapted to the opening of the urethra and is executed in a previously disclosed manner with a connection to a vacuum source for the purpose of producing negative pressure at least in an area around the tube.
In accordance with a preferred embodiment of the invention the aforementioned device consists of three parts so arranged as to be operatively connected to one another, of which one part is a base part supporting the tube with its connection, which base part is executed with the connection to the sac and is operatively connected on the one hand to a second part executed with a bowl shaped recess and is manufactured from a rigid, porous and air-permeable material, and on the other hand to a third part which is executed as a thin-walled and generally tubular shell of a flexible material, which, together with the second part forms a chamber communicating with the connection for a vacuum source, the flexible outer wall of which chamber is supported by spacer elements arranged conveniently at mutually identical distances apart or the second part.
In order to provide a good seal with the opening of the urethra without causing pain to the patient, the aforementioned device is executed around the connection to the tube with an annular bowl shaped recess facing towards the end of the tube which is intended to be introduced, in which recess there is arranged a body which fits the form of the recess, which body is made of a porous, air-permeable material with a smooth surface adjacent to the edge of the recess, the intention being, at least occas
REFERENCES:
patent: 4419097 (1983-12-01), Rowland
patent: 4810249 (1989-03-01), Glassman
Andersson Ingvar
Wadstein Jan
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