Licence: Public Domain Mark
Credit: Improvements in catheters / [Alfred Walsh]. Source: Wellcome Collection.
![N° 13,453 A.D. 1895 Date of Application, 12th July, 1895 Complete Specification Left, 10th Apr., 1896—Accepted, 16th May, 1896 PROVISIONAL SPECIFICATION. Improvements in Catheters. We, Alfred Walsh, of 23 Bartholomew Square, and Charles Maw, John Thompson, and Charles Trentham Maw, of the Firm of S. Maw, Son, & Thompson, of 7 to 12 Aldersgate Street, both in the City of London, Surgical Instrument Makers, do hereby declare the nature of this invention to be as 5 follows This invention has for its object improvements in catheters. Gum elastic catheters as at present made consist essentially of a tube of woven fabric stiffened by the application of a fluid preparation of oil and gum. Heretofore the interior of such catheters has been rough the fabric appearing on the inner 10 surface. This is objectionable as bacteria are likely to be harboured in the irregularities of the surface and perfect cleansing is very difficult if not impossible. According to this invention after the catheter has been made in the ordinary way, the fluid gum elastic is poured through it so as to thoroughly coat the 1® inner surface, then after a sufficient time has been allowed for the composition to set, a highly polished metallic wire is passed through and used to smooth the surface and finally when the interior coating is hard it is ground and polished by the aid of a wire burnisher and polishing powder. Thus the inner surface of the catheter is as highly finished as the exterior. Dated this 11th day of July 1895. ALFRED WALSH. CHARLES MAW. J. THOMPSON. C. TRENTHAM MAW. 25 COMPLETE SPECIFICATION. Improvements in Catheters. We, Alfred Walsh, of 23 Bartholomew Square, and Charles Maw, John Thompson, and Charles Trentham Maw, of the Firm of S. Maw, Son, & Thompson, of 7 to 12 Aldersgate Street, both in the City of London, Surgical 30 Instrument Makers, do hereby declare the nature of this invention and in what manner the same is to be performed to be particularly described and ascertained in and by the following statement:— This invention has for its object improvements in catheters. Gum elastic catheters as at present made consist essentially of a tube of woven 35 fabric stiffened by the application of a fluid preparation of oil and gum. Heretofore the interior of such catheters has been rough the fabric appearing on the inner surface. This is objectionable as bacteria are likely to be harboured in the irregularities of the surface and perfect cleansing is very difficult if not impossible. 40 According to this invention we produce a highly polished gum elastic surface in [Price 8d.]](https://iiif.wellcomecollection.org/image/b30735981_0001.jp2/full/800%2C/0/default.jpg)
