Extrusion apparatus for molding guiding tube for medical instrum

Details Extrusion apparatus for molding guiding tube for medical instrum Extrusion apparatus for molding guiding tube for medical instrum

1988-11-09

1990-04-24

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Core, pin or insert member

264159, 4253824, B29C 4720

Patent

active

049196057

ABSTRACT:
An extruder apparatus for molding a tube used for guiding a rod-like medical instrument into a living body. The resulting tubular body is made of a synthetic resin and has a longitudinal hollow portion to permit the passage of the rod-like medical instrument. The whole of the tubular body is formed to have a chemical uniformity, but at least one brittle portion such as a weld line is longitudinally formed over the entire length (or almost the entire length except the tip portion) of the tubular body. The brittle portion is formed by a die including a nozzle having a resin flow passageway of annular cross section. At least one baffle extends radially into the passageway for substantially temporarily splitting the flow which is then recombined to form the brittle portion.

REFERENCES:
patent: 1184254 (1916-05-01), McBean
patent: 2524829 (1950-10-01), Perzel
patent: 3656479 (1972-04-01), Huggins
patent: 3713442 (1972-01-01), Walter
patent: 3899283 (1975-08-01), Wallis
patent: 4054136 (1977-10-01), von Zeppelin
patent: 4402685 (1983-09-01), Buhler et al.
patent: 4451256 (1984-05-01), Weikl et al.

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