Medical hollow needle and a method of producing thereof

• US 5,575,780 A
• Filed: 07/19/1995
• Issued: 11/19/1996
• Est. Priority Date: 04/28/1995
• Status: Expired due to Term

• Current Assignee: Saito Medical Industries, Inc. (Air Water Incorporated)
• Original Assignee: Yoshikuni Saito
• Inventors: Saito, Yoshikuni
• Primary Examiner(s): YASKO JR, JOHN D
• Application Number:
  US08/504,038
• Time in Patent Office: 489 Days
• Field of Search: 604/272, 604/264, 604/48, 604/57, 604/164, 604/274, 606/222, 606/167, 72/369
• US Class Current: 604/272
• CPC Class Codes: A61M 5/3286 Needle tip design, e.g. for improved penetration
• CPC Class Codes: B24B 19/16 for grinding sharp-pointed workpieces, e.g. needles, pens, fish hooks, tweezers or record player styli grinding bevels on diamonds or sapphires B24B9/16; polishing of needles B24B29/08

Abstract

A medical hollow needle has a cylindrical member 2 inside which a medical liquid flow hole 25 is formed in the direction of its center axis. At a top edge portion 10 of the cylindrical member 2, a first bevel face 3 where the medical liquid flow hole 25 is open in an oblique direction, formed having a first inclined angle with respect to the axis center, is provided. At the top edge portion 10, a right bevel face 6, formed by rotating a first rotational angle in a positive direction with respect to the first bevel face 3 with the axis center as its center, having a second inclined angle with respect to the axis center is provided, and the left bevel face 7, formed by rotating a second rotational angle in an opposite direction with respect to the first bevel face 3 with the axis center as its center, having a third inclined angle with respect to the axis center, is provided. At the position opposed to the first bevel face 3 of the top edge portion 10, the sub-bevel face 12 grinded and formed in an oblique direction with respect to the axis center direction, thinning a wall thickness NA of the cylindrical member 2, is provided. A sharp edge portion 13 is comprised of at least these three bevel faces 6, 7, 12.

Claims

1. A medical hollow needle comprising:

a cylindrical member having a flow path capable of passing a fluid therein along a axis center direction;

a first bevel grinding face formed at a top end portion of said cylindrical member, such that said flow path is open in an oblique direction, having a first inclined angle with respect to said center axis;

a second bevel grinding face formed by-rotating a first rotational angle in a positive direction with respect to said first bevel grinding face with said center axis as its center, having a second inclined angle with respect to said center axis, and a third bevel grinding face formed by rotating a second rotational angle in an opposite direction with respect to said first bevel grinding face with said axis center as its center, having a third inclined angle with respect to said center axis, both formed at said top edge portion of said cylindrical member;

a fourth bevel grinding face in a shape of a plane, grinded and formed at a position opposed to said first bevel grinding face of said top edge portion of said cylindrical member in an oblique direction with respect to said center axis direction of said cylindrical member, thereby thinning a thickness of said cylindrical member; and

a sharp edge portion comprised of at least three grinding faces, that is, said second, said third and said fourth bevel grinding faces.

2. The medical hollow needle as set forth in claim 1, wherein said fourth bevel grinding face is formed at an inclined angle 2-15 degrees with respect to said center axis direction of said cylindrical member.

3. The medical hollow needle as set forth in claim 1, wherein said second and said third inclined angles are equal to each other.

4. The medical hollow needle as set forth in claim 1, wherein said first and said second rotational angles are equal to each other.

5. A method of producing a medical hollow needle, said method comprising:

grinding a top edge portion of a cylindrical member defining a flow path capable of passing a fluid therein along a center axis direction, in an oblique direction with respect to said center axis direction of said cylindrical member, thinning wall thickness of said cylindrical member, so as to form a fourth bevel grinding face in the shape of a plane;

performing a grinding machining on a portion opposed to said fourth bevel grinding face of said top edge portion of said cylindrical member formed said fourth bevel grinding face, in an oblique direction, having a first inclined angle with respect to said center axis so as to form a first bevel grinding face in which said flow path is open in an oblique direction;

performing a grinding machining on said top edge portion of said cylindrical member by rotating a first rotational angle in a positive direction with respect to said first bevel grinding face with said axis center as its center, having a second inclined angle with respect to said center axis so as to form a second bevel grinding face, and by rotating a second rotational angle in an opposite direction with respect to said first bevel grinding face with said axis center as its center, having a third inclined angle with respect to said center axis so as to form a third bevel grinding face, respectively; and

forming a sharp edge portion comprised of at least said second, said third and said fourth bevel grinding faces.

10. The method of producing the medical hollow needle as set forth in one of claim 5, 6, 7, 8, or 9 wherein said fourth bevel grinding face is grinded with an inclined angle of 2-15 degrees with respect to said center axis direction of said cylindrical member.

11. The method of producing the medical hollow needle as set forth in one of claim 5, 6, 7, 8, or 9 wherein said second and third inclined angles are equal to each other.

12. The method of producing the medical hollow needle as set forth in claim 5, 6, 7, 8, or 9 wherein said first and said second rotational angles are equal to each other.

6. A method of producing a medical hollow needle, said method comprising:

performing a grinding machining on a top edge portion of a cylindrical member formed a flow path capable of passing a fluid therein in its center axis direction, in an oblique direction having a first inclined angle with respect to said center axis so as to form a first bevel grinding face in which said flow path is open in an oblique direction;

performing a grinding machining on said top edge portion of said cylindrical member by rotating a first rotational angle in a positive direction with respect to said first bevel grinding face with said axis center as its center, having a second inclined angle with respect to said center axis so as to form a second bevel grinding face, and by rotating a second rotational angle in an opposite direction with respect to said first bevel grinding face with said axis center as its center, having a third inclined angle with respect to said center axis so as to form a third bevel grinding face, respectively;

grinding a position opposed to said first bevel grinding face of said top edge portion of said cylindrical member in an oblique direction with respect to said center axis, thinning a wall thickness of said cylindrical member so as to form a fourth bevel grinding face in the shape of a plane; and

forming a sharp edge portion comprised of at least said second, said third and said fourth bevel grinding faces.

7. A method of producing a medical hollow needle, said method comprising:

performing a grinding machining on a top edge portion of a cylindrical member forming a flow path capable of passing a fluid therein in its center axis direction, in an oblique direction having a first inclined angle with respect to said center axis so as to form a first bevel grinding face in which said flow path is open in an oblique direction;

grinding a position opposed to said first bevel grinding face of said top edge portion of said cylindrical member in an oblique direction with respect to said center axis, thinning wall thickness of said cylindrical member so as to form a fourth bevel grinding face in the shape of a plane;

performing a grinding machining on said top edge portion of said cylindrical member by rotating a first rotational angle in a positive direction with respect to said first bevel grinding face with said axis center as its center, having a second inclined angle with respect to said center axis so as to form a second bevel grinding face, and by rotating a second rotational angle in an opposite direction with respect to said first bevel grinding face with said axis center as its center, having a third inclined angle with respect to said center axis so as to form a third bevel grinding face, respectively; and

forming a sharp edge portion comprised of at least said second, said third and said fourth bevel grinding faces.

8. A method of producing a medical hollow needle, said method comprising:

performing a grinding machining on a top edge portion of a cylindrical member forming a flow path capable of passing a fluid therein in its center axis direction by rotating a first rotational angle in a positive direction with respect to a predetermined standard position with said axis center as its center, having a second inclined angle with respect to said center axis so as to form a second bevel grinding face, and by rotating a second rotational angle in an opposite direction with respect to said standard position with said axis center as its center, having a third inclined angle with respect to said center axis so as to form a third bevel grinding face, respectively;

grinding a position opposed to said standard position of said top edge portion of said cylindrical member in an oblique direction with respect to said center axis direction, thinning wall thickness of said cylindrical member so as to form a fourth bevel grinding face in the shape of a plane;

performing a grinding machining on said top edge portion of said cylindrical member at said standard position in an oblique direction, having a first inclined angle with respect to said center axis so as to form a first bevel grinding face in which said flow path is open in an oblique direction; and

forming a sharp edge portion comprised of at least said second, said third, and said fourth bevel grinding faces.

9. A method of producing a medical hollow needle, said method comprising:

performing a grinding machining on a top edge portion of a cylindrical member formed a flow path capable of passing a fluid therein in its center axis direction by rotating a first rotational angle in a positive direction with respect to a predetermined standard position with said axis center as its center, having a second inclined angle with respect to said center axis so as to form a second bevel grinding face, and by rotating a second rotational angle in an opposite direction with respect to said standard position with said axis center as its center, having a third inclined angle with respect to said center axis so as to form a third bevel grinding face, respectively;

performing a grinding machining on said top edge portion of said cylindrical member at said standard position in an oblique direction, having a first inclined angle with respect to said center axis so as to form a first bevel grinding face in which said flow path is open in an oblique direction;

grinding a position opposed to said first bevel grinding face of said top edge portion of said cylindrical member in an oblique direction with respect to said center axis direction, thinning wall thickness of said cylindrical member so as to form a fourth bevel grinding face in the shape of a plane; and

forming a sharp edge portion comprised of at least said second, said third, and said fourth bevel grinding faces.