Surgery – Means for introducing or removing material from body for... – Material introduced into and removed from body through...
Patent
1986-02-28
1988-01-05
Truluck, Dalton L.
Surgery
Means for introducing or removing material from body for...
Material introduced into and removed from body through...
604280, A61M 2500
Patent
active
047173793
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a catheter, probe or similar device intended to be inserted into a body cavity and which over a substantial portion of its length is double-walled, at which the outer wall through a plurality of capillary holes communicates with the outside of the catheter.
2. Description of the Related Art
A problem which occurs during the insertion of a catheter, probe and the like is dessication and irritation of the mucous membranes on the inside of the body cavity, which can lead to infections.
In U.S. Pat. No. 3,981,299 there is shown an urethral catheter which over a portion of its length is covered by a thin flexible membrane having a plurality of holes. In the space between the membrane and the catheter, a liquid or other substance can be injected. All the holes communicate with each other.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a catheter, probe or the like which is easy to insert without irritating the mucous membranes and which also permits longer insertion periods without any risk of infection. It is desirable that all capillary holes do not communicate with each other but that some holes can be used for supplying a washing agent, while other holes are used for draining the washing agent and any possible secretion from the body cavity. Besides, the catheter should be simple to manufacture. According to the invention this simplicity has been achieved by the fact that the inner wall on the outer tube and the outer wall on the inner tube is provided with longitudinal partitions for making separate longitudinal passages between the walls. These passages are in communication with the capillary holes.
The invention will be described below in details with reference to a pair of embodiments shown in the enclosed drawings.
FIG. 1 shows in a broken perspective a catheter according to the invention.
FIG. 2 is a transverse section through the catheter according to FIG. 1.
FIG. 3 is a longitudinal section through the insertion end of the catheter according to a somewhat modified design.
FIG. 4 shows a partly broken section through the rear end of the catheter.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The catheter 1 shown in FIG. 1 has a central flow channel 2 and a plurality of axial passages 3 arranged radially outside said channel 2 and regularly arranged along the circumference thereof. The passages 3 are perforated with a large number of very small capillary holes 4 from the outside of the catheter 1. These holes 4 can be located in longitudinal cavities or recesses 9 on the outside of the catheter 1 as is shown in FIGS. 1 and 2 or have a chamferred edge outwards (FIG. 3) in order to avoid damage to the mucous membranes.
To the axial passages 3 there is intended to be connected e.g. a compressed air source or a fluid pressure, so that a lubrication of the outside of the catheter 1 can be obtained during the insertion thereof. It is also possible that during the insertion time a continuous or intermittent washing of the catheter 1 can be performed in order to reduce the irritation of the mucous membrane and eliminate the risk of infection. It is also possible to alternately connect the passages 3 to a pressure or suction source so that some of the passages 3, i.e. every other one, is connected to a pressure source while the other passages 3 are connected to a suction source. In this way a draining of the washing agent and any possible secretion from the body cavity can be obtained.
Another possible manner in which to utilize the capillaries 4 is to fill the axial passages 3 with a gel- or cream like agent, which is wiped against the walls of the body cavity at the contact therewith in order to lubricate the outside of the catheter 1. The capillaries 4 are by capillary action filled with more agent as long as a sufficient amount of agent is present in the axial passages 3. This action implies that the passages 3 are closed at the introduction end of the catheter 1, as is shown in FIG. 3.
The m
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patent: 3598127 (1971-08-01), Wepsk
patent: 3981299 (1976-09-01), Murray
patent: 4186745 (1980-02-01), Lewis et al.
patent: 4406656 (1983-09-01), Hattler et al.
Mediplast AB
Truluck Dalton L.
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