US 2001/0041875 A1Published application

Medical anesthetic needle

AssigneeDr. Japan Co., Ltd.

InventorsAKIO HIGUCHI, HAYATO HYUGAJI

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Abstract

A medical anesthetic needle (1) is provided that includes an inner needle (3) of a straight needle shape, having a pencil-pointed tip (4), and an outer needle (2) of a straight tubular shape, having the inner needle inserted thereinto and therethrough from the rear end thereof. A foremost-end part (12) of a hollow, truncated conical shape or the like of the outer needle (2) is formed so that the minimum inner diameter thereof is smaller than the outer diameter of the main body (5) of the inner needle (3). When the inner needle (3) is inserted into and through the outer needle (2), the circumferential fore-end edge of the foremost-end part (12) is in close contact with the circumferential surface of the tip (4) or the main body (5) of the inner needle (3), 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.

Claims3

Dependent claims

A medical anesthetic needle (1) including an inner needle (3) of a straight needle shape, having a pencil-pointed tip (4), and an outer needle (2) of a straight tubular shape, having said inner needle inserted thereinto and therethrough from the rear end thereof, said medical anesthetic needle (1) CHARACTERIZED IN THAT:

said tip (4), having a conical shape, of said inner needle (3) extends axially from a main body (5) of a solid round-column shape towards the fore-end side;
said outer needle (2) includes:
a main body (10) of a hollow round-column shape having an inner diameter (D) greater than the outer diameter (d) of said main body (5) of said inner needle;
a fore-end part (11) of a hollow, truncated conical shape or the like that extends axially from said main body (10) towards the fore-end side of said outer needle;
and
a foremost-end part (12) of a hollow, truncated conical shape or the like that further extends axially from said fore-end part towards the fore-end side of said outer needle;
wherein, while the inner diameter of said fore-end part (11) is constant and equal to the inner diameter of said main body (10), the inner diameter of said foremost-end part (12) is reduced along the axis thereof towards the fore-end thereof with the minimum inner diameter (D1) of said foremost-end part (12) being smaller than the outer diameter (d) of said main body (5) of said inner needle.

4 more elements

Dependencies are inferred from the claim text.