The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 01, 1991
Filed:
May. 10, 1989
Kazuo Ichikawa, Toyota-Shi, Aichi-Ken, JP;
Other;
Abstract
A tube device for forming a fistula is constructed in such a way that the tube device is composed of a metallic guide wire, a small diameter tube to which the guide wire can be inserted in its center, a medium diameter tube covering the outer periphery of the small diameter tube, a medium-large diameter tube covering the outer periphery of the small diameter tube and having an outer diameter larger than the medium diameter tube, a large diameter tube covering the outer periphery of the small diameter tube and having an outer diameter larger than the medium-large diameter tube, a large diameter drainage tube covering the outer periphery of the small diameter tube and having an outer diameter equal to that of the large diameter tube, and an extra large diameter tube covering the outer periphery of the large diameter drainage tube. An outer diameter of each tip portion of the small diameter tube, medium diameter tube, medium-large diameter tube and large diameter tube is gradually reduced towards ends thereof to be taper-shaped. These tubes are exchanged and inserted in the order of their diameters, i.e. from small diameter to large diameter, by means of a guide wire. The extra large diameter tube necessary for the insertion of the endscope can be inserted in a short time with an extreme safety since the tapered surface of the tip portion of the tube applies the pressure to the liver tissue to expand it gradually.