Needle for membrane penetration

• US 4,666,438 A
• Filed: 07/02/1985
• Issued: 05/19/1987
• Est. Priority Date: 07/02/1985
• Status: Expired due to Fees

• Current Assignee: Raulerson, J. Daniel
• Original Assignee: Raulerson, J. Daniel
• Inventors: Raulerson, J. Daniel
• Primary Examiner(s): Pellegrino, Stephen C.
• Application Number:
  US06/751,015
• Time in Patent Office: 686 Days
• Field of Search: 604/272-274, 604/160, 604/164, 604/166, 604/168
• US Class Current: 604/272
• CPC Class Codes: A61M 2205/195 by the needle tip shape
• CPC Class Codes: A61M 25/065 Guide needles
• CPC Class Codes: A61M 5/158 Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body

Abstract

A needle specifically configured to enhance membrane penetration comprising an inner solid substantially cylindrical body including a longitudinally disposed fluid aspiration channel formed in the upper surface thereof and an outer penetration tip formed on the outer portion of the inner solid substantially cylindricla body, the penetration tip including a longitudinally disposed concave fluid recess extending between a penetration point formed on outer end thereof and the upper surface of the inner solid substantially cylindrical body rearward of the outermost end of the longitudinally disposed fluid aspiration channel and a pair of planar surfaces formed on opposite sides of the penetration tip and the solid substantially cylindrical body, the pair of planar surfaces converging forwardly to the penetration point and diverging upwardly to the outer portion of the longitudinally disposed concave fluid recess to intersect a pair of arcuate cutting edges diverging upwardly and rearwardly from the penetration point.

Claims

1. A needle specifically configured to enhance membrane penetration comprising an inner solid body including a fluid channel formed in the surface thereof and an outer penetration tip formed on the outer portion of said inner solid body, said penetration tip including a longitudinally disposed concave recess extending between a penetration point formed on an outer end thereof and the upper surface of said inner solid body, said penetration tip cooperatively formed by a pair of planar converging surfaces formed on opposite sides of said inner solid body, said pair of planar surfaces converge forward to said penetration point and diverge upwardly to intersect opposite sides of said longitudinally disposed concave recess to form a pair of cutting edges, each of said pair of cutting edges concave in both the horizontal and vertical planes relative to the longitudinal axis of said inner solid body.

2. The needle of claim 1 wherein said inner solid body is substantially cylindrical in configuration.

3. The needle of claim 2 wherein the ratio of the diameter of the longitudinally disposed concave recess to the diameter of the inner solid substantially cylindrical body is substantially 1.3 to 1.

4. The needle of claim 1 wherein the horizontal included angle formed between said pair of planar surfaces is substantially sixteen degrees.

5. The needle of claim 4 wherein the vertical included angle formed between said pair of planar surface is substantially fifty degrees.

6. The needle of claim 1 further including the transition region comprising a pair of forwardly diverging edges extending from opposite sides of said longitudinally disposed fluid aspiration channel to intersect said forwardly converging cutting edges.

7. The needle of claim 6 wherein said pair of forwardly diverging edges extend downwardly from opposite sides of said longitudinally disposed fluid aspiration channel to intersect said forwardly converging cutting edges.

8. The needle of claim 1 wherein said outer penetration tip has a major axis inclined relative to the longitudinal axis of said inner solid body.

9. The needle of claim 1 wherein the included angle between said major axis and said longitudinal axis is substantially fifteen degrees.

10. The needle of claim 9 wherein said longitudinally disposed concave recess has a major axis included relative to the longitudinal axis of said inner solid body.

11. The needle of claim 10 wherein the inclined angle between said major axis and said longitudinal axis is substantially fifteen degrees.

12. The needle of claim 1 wherein said inner solid body further includes a longitudinally disposed fluid aspiration channel formed in the upper surface thereof.

13. The needle of claim 12 wherein said longitudinally disposed fluid aspiration channel is substantially U-shaped in configuration.

14. The needle of claim 12 wherein said longitudinally disposed concave recess extends between said penetration point and the upper surface of said inner solid body rearward of the outer portion of said longitudinally disposed fluid aspiration channel.

15. A needle specifically configured to enhance membrane penetration comprising an inner solid body including a fluid aspiration channel formed on the upper surface of said body and an outer penetration tip formed on the outer portion of said inner solid body, said penetration tip including a longitudinally disposed concave recess extending between a penetration point formed on outer end thereof and the upper surface of said inner solid body, said penetration point cooperatively formed by a pair of planar converging surfaces formed on opposite sides of said inner solid body, said pair of planar surfaces converge forward to said penetration point and diverge upwardly to intersect the outer portion of said longitudinally disposed concave recess to form a pair of cutting edges and a transition region comprising a pair of forwardly diverging edges extending downwardly from opposite sides of said fluid aspiration channel to intersect the origin of said forwardly converging cutting edges opposite said penetration tip.

16. The needle of claim 15 wherein each of said pair of cutting edges are concave in both the horizontal and vertical planes relative to the longitudinal axis of said inner solid body.