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United States Patent [i9j
[ii] Patent Number: 4,738,667  Date of Patent: Apr. 19, 1988
 PREFORMED CATHETER ASSEMBLY
 Inventor: Niall T. M. Galloway, 3211 Massdale Ave., Durham, N.C. 27707
 Appl. No.: 927,044
 Filed: Nov. 4,1986
 Lit Q.* A61M 25/00
 U.S.C1 604/281; 604/54
 Field of Search 604/51-53,
 References Cited
U.S. PATENT DOCUMENTS
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4,248,224 2/1981 Jones .
4,563,181 1/1986 Wijayarathna et al. .
4,568,338 2/1986 Todd .
4,694,838 9/1987 Wijayarthna et al 604/281 X
OTHER PUBLICATIONS "A Clinical Evaluation of a Modified Foley Catheter",
by Rubino & Scialabba, Journal of Obstetrics and Gyna-
ecology, May 1, 1983, pp. 103-104.
"A New Catheter for the Female Patient", by O'Neil et
al., Austalian and New Zealand Journal of Obstetrics and
Gynaecology, 1982, pp. 151-152.
"Coiled Tip Catheter for Measuring Intraversical Pres-
sure", by Morita et al., Urology, Nov., 1986, p. 501.
Primary Examiner—Daltbn L. Truluck
Attorney, Agent, or Firm—Richard Jenkins
A catheter assembly which includes a catheter having a flexible, preformed distal end and a sheath slidably mounted thereon. The sheath can be slidably moved from a first position with the sheath overlying a portion of the catheter that is not precurved to a second position with the sheath overlying the precurved distal end in order to straighten the catheter for insertion and removal from a body cavity. When the catheter assembly is introduced into a body cavity, the distal end of the catheter is removed from the sheath in order to allow it to assume its preshaped form and thereby serve to retain the catheter. The distal end of the catheter is withdrawn into the sheath in order to remove the catheter from a body cavity.
12 Claims, 4 Drawing Sheets