Pricking Needle and Lancet Having The Same

• US 20090318946A1
• Filed: 05/30/2007
• Published: 12/24/2009
• Est. Priority Date: 06/02/2006
• Status: Abandoned Application

• Current Assignee: Asahi Polyslider Company, Limited (Izumi-Cosmo Co., Ltd.)
• Original Assignee: Asahi Polyslider Company, Limited (Izumi-Cosmo Co., Ltd.)
• Inventors: Tamesada, Yuji
• Application Number:
  US12/227,578
• Publication Number:
  US 20090318946A1
• Time in Patent Office: Days
• US Class Current: 606/181
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150282 for piercing elements, e.g. blade, lancet, canula, needle
• CPC Class Codes: A61B 5/150427 Specific tip design, e.g. for improved penetration characteristics
• CPC Class Codes: A61B 5/150503 Single-ended needles hollow piercing element tip design A61B5/150396, needle sets for catheters A61M25/06, needles for bringing media into the body A61M5/32
• CPC Class Codes: A61B 5/151 Devices specially adapted for taking samples of capillary blood, e.g. by lancets , needles or blades
• CPC Class Codes: A61M 5/3286 Needle tip design, e.g. for improved penetration
• CPC Class Codes: Y10T 29/49995 Shaping one-piece blank by removing material

Abstract

There is provided a pricking needle which causes less pain upon the pricking operation.

The front end portion of the pricking needle is defined by:

• • (1) a rear portion of an ellipse which is formed by cutting through the cylindrical member obliquely ahead from its backward;
  • (2) an isosceles triangle portion that has a central portion of a front edge of the rear portion of the ellipse as a base, that extends forward and obliquely downward from the central portion, and that extends more obliquely downward than a spreading direction of the rear portion of the ellipse;
  • (3) a rightward inclined surface portion and a leftward inclined surface portion, each including an oblique side of the isosceles triangle portion, a side portion of the front edge of the rear portion of the ellipse and a line segment which connects a front apex of the isosceles triangle portion and a distal end of the pricking needle, and extending from the right oblique side of the isosceles triangle obliquely downward; and
  • (4) a portion of a side face of the cylindrical member.

Claims

1. A pricking needle having a front end portion as a pricking region which needle is formed from a cylindrical member, wherein the front end portion is defined by:

(1) a rear portion of an ellipse which is formed by cutting through the cylindrical member obliquely ahead from its backward;

(2) an isosceles triangle portion that has a central portion of a front edge of the rear portion of the ellipse as a base, that extends forward and obliquely downward from the central portion, and that extends more obliquely downward than a spreading direction of the rear portion of the ellipse;

(3) a rightward inclined surface portion that includes a right oblique side of the isosceles triangle portion, a right side portion of the front edge of the rear portion of the ellipse, and a line segment which connects a front apex of the isosceles triangle portion and a distal end of the pricking needle, and that extends from the right oblique side of the isosceles triangle obliquely downward toward the right;

(4) a leftward inclined surface portion that includes a left oblique side of the isosceles triangle portion, a left side portion of the front edge of the rear portion of the ellipse, and the line segment connecting the front apex of the isosceles triangle portion and the distal end of the pricking needle, and that extends from the left oblique side of the isosceles triangle obliquely downward toward the left; and

(5) a portion of a side face of the cylindrical member which portion includes;

(5-1) a peripheral portion of the rear portion of the ellipse excluding the front edge thereof;

(5-2) a peripheral portion of the rightward inclined surface portion excluding the right oblique side of the isosceles triangle, the right side portion of the front edge of the rear portion of the ellipse, and the line segment connecting the front apex of the isosceles triangle portion and the distal end of the pricking needle; and

(5-3) a peripheral portion of the leftward inclined surface portion excluding the left oblique side of the isosceles triangle, the left side portion of the front edge of the elliptical rear portion, and the line segment connecting the front apex of the isosceles triangle and the distal end of the pricking needle.

2. The pricking needle according to claim 1 wherein a pricking angle is in the range between 5°

and 30°

.

3. The pricking needle according to claim 1 wherein an inclination angle of the rear portion of the ellipse is in the range between 5°

and 20°

.

4. The pricking needle according to claim 1 wherein an inclination angle of the isosceles triangle portion is in the range between 5°

and 25°

.

5. A lancet which comprises the pricking needle according to claim 1.

6. A pricking needle formed from a cylindrical member having a front end portion as a pricking region, wherein the front end portion is defined by:

(1) an elliptical rear portion formed by cutting through a cylindrical member obliquely ahead from the backward;

(2) an line symmetrical pentagon that has a front edge of the rear portion of the ellipse as a base, that extends forward from the front edge obliquely downward, and that extends more obliquely downward than a spreading direction of the rear portion of the ellipse;

(3) a rightward inclined surface portion that includes a front right oblique side of the line symmetrical pentagon, and a line segment connecting a front apex of the line symmetrical pentagon and a distal end of the pricking region, and that extends obliquely downward toward the right from the front right oblique side of the line symmetrical pentagon;

(4) a leftward inclined surface portion that includes a front left oblique side of the line symmetrical pentagon, and a line segment connecting the front apex of the line symmetrical pentagon and the distal end of the pricking region, and that extends obliquely downward toward the left from the front left oblique side of the line symmetrical pentagon; and

(5) a portion of a side face of the cylindrical member which portion includes;

(5-1) a peripheral portion of the rear portion of the ellipse excluding the front edge;

(5-2) a rear left oblique side and a rear left oblique side of the line symmetrical pentagon;

(5-3) a peripheral portion of the rightward inclined surface portion excluding the front right oblique side of the line symmetrical pentagon and the line segment that connects the front apex of the line symmetrical pentagon and the distal end of the pricking region; and

(5-4) a peripheral portion of the leftward inclined surface portion excluding the front left oblique side of the line symmetrical pentagon and the line segment that connects the front apex of the line symmetrical pentagon and the distal end portion of the pricking region.

7. The pricking needle according to claim 6 wherein a pricking angle is in the range between 5°

and 30°

.

8. The pricking needle according to claim 6 wherein an inclination angle of the rear portion of the ellipse is in the range between 5°

and 20°

.

9. The pricking needle according to claim 6 wherein an inclination angle of the line symmetry pentagon is in the range between 5°

and 25°

.

10. A lancet which comprises the pricking needle according to claim 6.

11. A process for manufacturing a pricking needle comprising the steps of:

(1) cutting a cylindrical material obliquely ahead so as to form an elliptical cross section;

(2) cutting a front portion of the elliptical cross section thus formed in a direction to the right obliquely downward and in a direction to the left obliquely downward so as to form a rightward inclined surface and a leftward inclined surface so as to obtain a pricking needle precursor that has the remaining portion of the elliptical cross section and the rightward inclined surface and the leftward inclined surface (it is noted that when viewing the pricking needle precursor ahead from the rear of the elliptical cross section forward, the rightward inclined surface and the leftward inclined surface are disposed in a line symmetric relationship with respect to the axis of the cylindrical material, and the rear portion of the elliptical cross section adjoins the rightward inclined surface and the leftward inclined surface so as to form the apex defined by these three members (the rightward inclined surface, the leftward inclined surface, and the rear portion of the elliptical cross section) that are in contact with each other), and

(3) removing a portion of triangular pyramid portion, that is defined by a point located on a contact line between the rightward inclined surface and the rear portion of the elliptical cross section, a point located on a contact line between the leftward inclined surface and the rear portion of the elliptical cross section, a point located on a contact line between the rightward inclined surface and the leftward inclined surface and said apex, from the pricking needle precursor.

12. A lancet which is produced by the process according to claim 11.