Abstract: An ultrasonic diagnostic apparatus includes an insertion section formed by a flexible elongate tube having a distal end portion and a proximal end portion. A driving shaft passes through the flexible elongate tube of the insertion section between a control section at the proximal end of the insertion section, and an ultrasonic transducer arranged for rotation at the distal end portion of the insertion section. The driving shaft includes a flexible elongate member formed by a pair of coils closely fitted coaxially one within the other. The coils have different winding directions thus providing circumferential rigidity when the driving shaft is rotated by a driving source at the control section. A signal cable is routed through the inside space of the coils forming the driving shaft and connects at one end with the transducer. The other end of the signal cable connects with a rotary terminal arrangement at the end of the driving shaft located at the control section.

Abstract: With an ultrasonic scanner for coeliac examination, the distal end of the insertion section is provided with a distal end part consisting of a beam-scanning section and beam transmitting and receiving section. The beam-scanning section comprises a beam mirror set in a beam-scanning chamber formed in a casing. A reflection plane formed at one end of the beam mirror is inclined at an angle of, for example, 45.degree. to its rotation axis. The beam mirror is rotated by means of a mirror shaft and flexible shaft. The beam transmitting and receiving section comprises a holder in which a vibrator is set. The holder is securely fitted into a receptacle formed in the casing by the threaded engagement of a fitting cap with the receptacle. The vibrator is electrically connected to the insertion body in a detachable state.

Abstract: An ultrasonic wave diagnosis device includes an ultrasonic wave transmission/reception scanner disposed at a distal end of an insertion section and having an ultrasonic wave oscillator therein, and a balloon surrounding the scanner and inflated outwardly by supplying an ultrasonic wave propagation liquid medium. A recess is formed in part of a circumferential surface of the insertion section, in the vicinity of the balloon in which an observation optical system is disposed to have a field of sight toward the balloon.

Abstract: A propylene block copolymer produced by polymerizing propylene, ethylene and an .alpha.-olefin having 4 to 8 carbon atoms in two stages with a Zieglar-Natta catalyst by a process which comprises (A) supplying propylene and ethylene in the first stage and propylene and the .alpha.-olefin in the second stage, or (B) supplying propylene and the .alpha.-olefin in the first stage and propylene and ethylene in the second stage, to the polymerization system, wherein the amounts of propylene and ethylene supplied in the first stage of (A) or in the second stage of (B) are 90 to 99 wt % and 10 to 1 wt % based on the total amount of propylene and ethylene supplied in the first stage of (A) or in the second stage of (B), respectively, the amounts of propylene and the .alpha.-olefin supplied in the second stage of (A) or in the first stage of (B) are 60 to 98 wt % and 40 to 2 wt % based on the total amount of propylene and the .alpha.

Abstract: An endoscope having an ultrasonic diagnosis function, comprises a distal end including an observing portion connected to a flexible tube, and provided with a view window and an illumination window formed on one surface thereof; an ultrasonic wave emitting-receiving portion located on the tip side of the observing portion aligned with the observing portion and provided with an ultrasonic oscillator having an ultrasonic wave emitting and receiving plane parallel with the view window; and a parallel moving link mechanism for moving the ultrasonic wave emitting-receiving portion such that it is moved away from the observing portion with the ultrasonic wave emitting-receiving plane kept substantially parallel with the view window.

Abstract: An insert section of an ultrasonic probe device which is bendably coupled by means of a hinge with two rotation shafts rotatably disposed within an insert section that is coupled to a universal joint. The distal tube can be bent freely by operating a control knob at a control section, so that an ultrasonic transducer member at the tip of the distal tube may be brought closely into contact with the body wall.

Abstract: A catalyst system useful for the polymerization of olefins which comprises(A) at least one organometallic compound of a typical metal belonging to I, II and III group of Periodic table,(B) a reaction production of (i) a solid organomagnesium compound of the formula: MgR.sub.l X.sub.2-1..alpha.D wherein R is a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom, D is a Lewis base, l is a number in the range of 0<l<2 and .alpha. is a number in the range of 0.ltoreq..alpha.<1.5, (ii) a phenol compound, (iii) a Lewis base, and (iv) a titanium compound and/or vanadium compound, and optionally(C) a Lewis base in an amount of up to 1 mole to 1 mole of the component (A),and a process for homo- or copolymerization of olefins by using the catalyst system. The catalyst system of the present invention shows excellent activities not only per the transition metal compound but also per the solid catalyst and can give polyolefins having a high stereo-regularity.

Abstract: A process for the polymerization of an olefin which comprises polymerizing an olefin in the presence of a catalyst system consisting essentially of(A) an organoaluminum compound represented by the formula: AlR.sub.m.sup.1 X.sub.3-m.sup.1 wherein R.sup.1 is a hydrocarbon group having 1 to 8 carbon atoms, X.sup.1 is a halogen atom or an alkoxy group having 1 to 8 atoms and m is a number in the range of 1 to 3,(B) a product prepared by the reaction of (i) a titanium compound selected from the group represented by the formula: Ti(OR.sup.2).sub.p X.sub.q.sup.2 wherein R.sup.2 is a hydrocarbon group having 1 to 8 carbon atoms, X.sup.2 is a halogen atom and p and q are each a number satisfying the following ranges: 0.ltoreq.p.ltoreq.4, 0.ltoreq.q.ltoreq.

Abstract: A method for the continuous production of crystalline ethylene-propylene block copolymers containing propylene as the major component and having excellent physical properties as that by a batch process in a slurry-phase by homopolymerizing propylene and then copolymerizing ethylene and propylene in the presence of an inert hydrocarbon solvent and a stereoregular polymerization catalyst in polymerization vessels connected in series, which is characterized by homopolymerizing propylene in three polymerization vessels, wherein the inner pressure of the vessels is decreased in order so as to make the inner-pressure difference between each consecutive two vessels from 1 to 3 kg/cm.sup.