Dr. Japan Co., Ltd.

Oki Electric Industry, Ltd.

Akio Higuchi

Hayato Hyugaji

Hitoshi Someya

A medical bevel needle () having an open bevel end surfaceis provided, wherein cutting edges () that linearly extend from the front end of the front-end portion () on the right and left sides diagonally rearwardly are formed either by right and left front ground faces () crossing the open bevel end surface () or by right and left front ground faces () crossing the external circumferential surface () of the bevel needle (), and the maximum lateral width between the cutting edges is limited by right and left rear ground surfaces (). When the needle axis is held horizontal with the open bevel end surface () facing upward, the right and left front ground surfaces () cross each other at the front end of the front-end portion (), and extend diagonally rearwardly and symmetrically with respect to a vertical plane containing the needle axis, where the right and left rear ground surfaces (), respectively succeed the right and left front ground surfaces () at a longitudinal position where the lateral width between the right and left front ground surfaces () reaches a specified length, e.g., a length equal to the radius of the bevel needle, and extend diagonally rearwardly and symmetrically with respect to the vertical plane at an angle smaller than the angle of the right and left front ground surfaces () with respect to the vertical plane. The right and left rear ground surfaces () respectively have a tilt angle of 5&#x3c0;/12 to &#x3c0;/2 radians (75 to 90 degrees) with respect to the horizontal plane.

Medical bevel needle

A outer needle of an anesthetic needle assembly to be injected into an epidural area, has a distal end which is cut and bent to form an annular cutting edge. The distal end is gently bent so that an anesthetic needle having a forward end can slide readily out of the annular cutting edge. The annular cutting edge has a wave-like configuration with an extended circular or rectangular annulus with round corners and outwardly expanded sides.

Outer needle of anesthetic needle assembly for epidural

A medical anesthetic needle which comprise an outside needle and a mandrin inserted into the outer needle to freely move in and out, and is slightly bent upward at is tip when its needle axis is positioned horizontal. The mandrin is manufacture by a first step of cutting the tip end of a metallic wire such as stainless steel wires obliquely to form a blade surface which intersects the axis at a predetermined angle of the mandrin blade surface, a second step of cutting off that portion of the metallic wire, which extends from the underside of the wire up to a horizontal plane located at a higher level than the center line of the wire, in a columnar region between the upper end of the blade surface and a position rearwardly distant three times the diameter of the wire or more from the upper end, to form a blade tip, a split-columnar connection succeeding the blade tip, and a columnar portion succeeding the connection, and a third step of bending the connection in such a manner that the upper end of the blade surface becomes higher a predetermined distance than the upper surface of the columnar portion and the axis of the blade tip is inclined at a predetermined angle (&thgr;) relative to the horizontal, and cutting the entire length of the mandrin into a predetermined length.

Mandrin of medical anesthetic needle and method of manufacturing same

A medical anesthetic needle ( ) is provided that includes an inner needle ( ) of a straight needle shape, having a pencil-pointed tip ( ), and an outer needle ( ) of a straight tubular shape, having the inner needle inserted thereinto and therethrough from the rear end thereof. A foremost-end part ( ) of a hollow, truncated conical shape or the like of the outer needle ( ) is formed so that the minimum inner diameter thereof is smaller than the outer diameter of the main body ( ) of the inner needle ( ). When the inner needle ( ) is inserted into and through the outer needle ( ), the circumferential fore-end edge of the foremost-end part ( ) is in close contact with the circumferential surface of the tip ( ) or the main body ( ) of the inner needle ( ), and no gaps are thus formed therebetween. Therefore, when needled, a patient's nervous tissue is unlikely to be nipped in a gap between the inner and outer needles to cause pain to the patient.

Medical anesthetic needle

A display unit has a body including a display screen, and a tilt mechanism including a support mounted on the bottom of the body and composed of two partly cylindrical continuous outer surfaces having spaced center axes of curvature, and a base having a plurality of projections on which the outer surfaces are slidably disposed. When the display unit is tilted to change the angle of the display screen with respect to the vertical direction, any point on the display screen is moved back and forth only for a small distance because the center axes of curvature are moved with turning movement of the outer surfaces.

Growing community of inventors

Tokyo, Japan

Akio Higuchi