Improvements in and relating to Catheters, Bougies, and like Surgical Instruments.
Year: 1889

page_text: Date of Application, 19th Mar., 1839
Specification Accepted, 25th May, 1889
Improvements in and relating to Catheters, Bougies, and like
Surgical Instruments.
We, CHARLES ARTHUR CHAPMAN, of No. 8 Stock Orchard Street, Caledonian Road
London, N. surgical Instrument maker, and EDWARD HALL GRIMWADE, of New Inn
Yard, Tottenham Court Road, London, W.C. Wholesale Druggist, do hereby declare
the nature of this invention and in what manner the same is to be performed, to he
particularly described and ascertained in and by the following statement:-
Our invention has reference to and is based upon Patent No. 1257787 for Improve-
ments in Catheters granted to Charles Arthur Chapman, in which is described a
catheter to the end of which is adapted a protective silver eye.
Our present invention relates to an improved method of forming the body of a
catheter or like surgical instrument with view to ensure its durability and increase
its flexibility.
In accordance with our Invention we form the body of a catheter, bougie or like
surgical instrument of a closely spirally wound wire-preferably of non-corrodible
metal to one end of which is secured, by any suitable means, the silver eye above
referred to, and which is described in the Specification of Patent No. 12,57787 as
aforesaid. This highly elastic foundation is served or covered with woven linen
thread, and is finally treated externally and internally with an elastic gum or
equivalent to serve as a protective medium in the manner set out in the case of
the catheters described in the Specification of the Invention of Charles Arthur
Chapman No. 125777 above referred to.
In the accompanying drawings Figures 1 and 2 illustrate catheters constructed in
accordance with our Invention, having modified forms of heads, Figure 3 being a
view partly in section of a portion of a catheter drawn to enlarged scale, illustrative
of our said improvements. Referring to Figure 3 the head or protective point A is
formed with a suitably shaped eye or opening a. The foundation or body of the
catheter consists of a spirally wound wire B or like suitable material to impart the
required degree of flexibility, shown in section B¹. Said spirally wound wire is
covered with a strong linen thread C (preferably that known as Belfast linen thread)
shown in section at (2

page_text: The catheter constructed as above is treated or coated externally and internally
with a protective layer of elastic gum as illustrated respectively at D and E.
A catheter, bougie or like surgical instrument made up in the manner above
described has among other important advantages, that of being more elastic, and less
liable to damage arising to the coating or covering, by being bent or crushed, bence
the risk of the cracking and consequent disintegration of the protective medium is
reduced to a minimum.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed we declare that what
we claim is :-
In a catheter, bougie or like surgical instrument, the construction of the body
of same, of a spirally wound wire, the whole being treated substantially as herein
set forth and shown in the accompanying drawings.
JAMES
STEVENSON,
Gray's Inn Chambers,
20, High Holborn, London, W.C.,
Agent for Applicants.