IMPROVEMENTS IN CATHETERS
Year: 1885

page_text: I, JOHN BANKS, Manager of the Instrument Department of S. Maw Sonnd
Thompson of 7 to 12 Aldersgate Street in the City of London, do hereby declare
the nature of my invention for "IMPROVEMENTS IN CATHETERS," to be as
follows:-
At the present time ordinary silk and other web catheters are formed from tubes
of silk and other web closed at the extremity and with an eye or opening cut in
the side of the tube at a short distance from the closed end.
Catheters formed in this way have this disadvantage. The closed end of the
tube being hollow and the eye at the side being necessarily at some short distance
from the end a fcavity is formed at the extreme end which it is difficult to clean
and in which unless great care is taken deposit accumulates and fungoid or other
growths arise from which considerable injury may arise to any one subsequently
using the catheter.
To remedy this inconvenience I according to this invention close in this hollow
end so as to prevent the possibility. of any matters accumulating in it. To effect
this I form an oblique division across the interior of the starting from the end of
the eye next to the closed end and passing obliquely to the opposite side of the
tube to a point approximately opposite to the opposite end of the eye. The
division I form of thread stitched through the sides of the tube and passed to and
fro across from one side of the tube to the other in two directions at right angles
to one another the threads passing in one direction being made to interlace with
threads passing at right angles to them so as to produce as it were a woven
division.
Afterwards the tube with the division formed across its end is covered with the
ordinary varnish or coating material with which silk web catheters are ordinarily
coated so rendering the division waterproof and making a close joint all around it
where it meets the inner sides of the catheter.
By making the division obliquely as above described just as free a passage as
heretofore is left for the flow of urine from the bladder into the catheter whilst at
the same time no cavity is left at the end for the accumulation of deposit or
growth.
.L.
:

page_text: I JOHN BANKS Manager of the Instrument Department of S. Maw Son and
Thompson of 7 to 12 Aldersgate Street in the City of London do hereby declare
the nature of my invention for "IMPROVEMENTS IN CATHETERS" and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement :—
:
At the present time ordinary silk and other web catheters are formed from tubes
of silk and other web closed at the extremity and with an eye or opening cut in
the side of the tube at a short distance from the closed end.
Catheters formed in this way have this disadvantage-The closed end of the
tube being hollow and the eye at the side being necessarily at some short distance
from the end a cavity is formed at the extreme end which it is difficult to clean
and in which unless great care is taken deposit accumulates and fungoid or other
growths arise from which considerable injury may arise to any one subsequently
using the catheter.
To remedy this inconvenience I according to this invention close in this hollow
end so as to prevent the possibility of any matters accumulating in it-To effect
this I form an oblique division across the interior of the tube starting from the
end of the eye next to the closed end and passing obliquely to the opposite side of
the tube to a point approximately opposite to the opposite end of the eye.
The division I form of thread stitched through the sides of the tube and passed
to and fro across from one side of the tube to the other in two directions at right
angles to one another the threads passing in one direction being made to interlace
with threads passing at right angles to them so as to produce as it were a woven
division.
Afterwards the tube with the division formed across its end is covered with the
ordinary varnish or coating material with which silk web catheters are ordinarily
coated so rendering the division waterproof and making a close joint all around
it where it meets the inner sides of the catheter..
By making the division obliquely as above described just as free a passage as
heretofore is left for the flow of urine from the bladder into the catheter whilst at
the same time no cavity is left at the end for the accumulation of deposit or
growth.
In order that my said invention may be most fully understood and readily
carried into effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side view and Figure 2 is a front view of a portion of the web of
· an ordinary web catheter; the figure is drawn considerably larger than the real
Figure 1 is a side view and Figure 2 is a front view of a portion of the web of
· an ordinary web catheter; the figure is drawn considerably larger than the real
size.
4
The web is a hollow or tubular braid preferably of silk.
. In the process of finishing the catheter this web is repeatedly coated with a
varnish or preparation of which drying oil is the main ingredient. It is thus

page_text: rendered waterproof and smooth and sufficient stiffness is imparted to it whilst it
remains very supple.
a is the eye of the catheter.
The drawing represents the web as it appears when it has been slightly stiffened
by a preliminary treatment with the varnish or preparation.
This is the state in which the web is when I proceed to partition off the part
beyond the eye by introducing an oblique partition across the interior of the
tubular web. By means of a needle I sew into the interior of the web several
parallel silk threads as indicated by dotted lines in Figure 3. This figure shows
the back of the catheter web or the side of it opposite to that in which the eye is
formed. The same threads are also shown by a dotted line in Figure 4. Having
placed these threads I proceed to cross them by other threads shown by dotted
Jines in Figure 5 which also is.a back view. In sewing in the latter threads I pass
them alternately over and under the threads shown in Figures 3 and 4. In this
way I produce a woven partition in the interior of the web passing obliquely
across the tube from the front part of the eye to the back at a point further
removed from the point. So the part of the web beyond the eye is effectually
partitioned off and there is no end cavity left in communication with the passage
through the catheter. The catheter is then finished in the usual way with further
coatings of the varnish or preparation so that the web becomes completely
embedded and the partition at the same time becomes covered and embedded in
the covering composition.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
.
1. My improved web catheter which at the end beyond the eye is closed so as to
leave no cavity in communication with the passage.
2. The improved method in the production of web catheters consisting in closing
the web obliquely in front of the eye during the process of covering and after
wards finishing the catheter substantially as described.
CARPMAEL & Co.,
Agents for the Applicant.