Precision syringe

Patent metadata

Field	Value
Publication number	US-11167091-B2
Application number	US-201816484171-A
Country	US
Kind code	B2
Filing date	Feb 15, 2018
Priority date	Feb 15, 2017
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

A precision syringe includes a syringe barrel and plunger that has a base, an internal portion, and an external portion. The internal portion of the plunger extends longitudinally into the syringe barrel. The internal portion has a first end coupled to the base and a second end that is configured to push fluid out of and/or suction fluid into the syringe barrel. The external portion extends longitudinally along an outer surface of the syringe barrel. The external portion has a first end coupled to the base and a second end that is configured to receive an applied force that causes the plunger to move relative to the syringe barrel so that the second end of the internal portion is actuated through a portion of the syringe barrel (e.g., to dispense fluid from or suction fluid into the syringe barrel).

First claim

What is claimed is:

1. A syringe, comprising:
a syringe barrel; and
a plunger, the plunger having a base, an internal portion, and an external portion,
the internal portion having a first end coupled to the base, the internal portion extending longitudinally into the syringe barrel and having a second end configured to push a fluid out of the syringe barrel,
the external portion having a first end coupled to the base, the external portion extending longitudinally along an outer surface of the syringe barrel and having a projection disposed at a second end of the external portion, the projection configured to receive an applied force that causes an entirety of the plunger to move relative to the syringe barrel so that the second end of the internal portion is actuated through a portion of the syringe barrel, wherein a distance between the second end of the internal portion and the projection is less than a distance between the base and the projection, wherein the projection is perpendicular to the external portion of the plunger, wherein the projection extends a distance of 5 to 15 mm from the external portion of the plunger, wherein the projection includes surface texturing comprising a pattern of protuberances on the projection, and wherein the external portion of the plunger includes additional surface texturing on a surface of the external portion that is adjacent to the projection.

2. The syringe as recited in claim 1 , wherein the internal portion and the external portion are perpendicular to the base and parallel to one another.

3. The syringe as recited in claim 1 , wherein the projection is perpendicular to a longitudinal axis of the syringe barrel.

4. The syringe as recited in claim 1 , wherein the plunger is formed from a common mold or print.

5. The syringe as recited in claim 1 , further comprising:
a guide disposed upon the outer surface of the syringe barrel, the guide configured to at least partially constrain a movement of the plunger relative to the syringe barrel.

6. The syringe as recited in claim 5 , wherein the guide is configured to at least partially prevent the external portion of the plunger from moving perpendicular to a longitudinal axis of the syringe barrel.

7. The syringe as recited in claim 5 , wherein the guide has a shape that is cooperative with a shape of an indentation formed within the external portion of the plunger so that the external portion of the plunger fits over at least a portion of the guide and slides along the guide in a longitudinal direction relative to the syringe barrel.

8. The syringe as recited in claim 7 , wherein a cross-section of the guide is polygonal except for a curved side that conforms to a curvature of the syringe barrel, such that the curved side of the guide forms a continuous interface between the guide and an external surface of a cylindrical body of the syringe barrel.

9. The syringe as recited in claim 8 , wherein the cross-section of the guide is pentagonal except for the curved side.

10. The syringe as recited in claim 1 , wherein the syringe barrel has a first end with an opening for receiving the plunger and a second end with a second opening for receiving or dispensing the fluid, the first end of the syringe barrel also having a flange disposed about the opening, the flange including a notch that at least partially surrounds the external portion of the plunger.

11. A syringe plunger, comprising:
a base;
an internal portion having a first end coupled to the base, the internal portion configured to extend longitudinally into a syringe barrel and having a second end configured to push a fluid out of the syringe barrel; and
an external portion having a first end coupled to the base, the external portion configured to extend longitudinally along an outer surface of the syringe barrel and having a projection disposed at a second end of the external portion, the projection configured to receive an applied force that causes an entirety of the plunger to move relative to the syringe barrel so that the second end of the internal portion is actuated through a portion of the syringe barrel, wherein a distance between the second end of the internal portion and the projection is less than a distance between the base and the projection, wherein the projection is perpendicular to the external portion of the plunger, wherein the projection extends a distance of 5 to 15 mm from the external portion of the plunger, wherein the projection includes surface texturing comprising a pattern of protuberances on the projection, and wherein the external portion of the plunger includes additional surface texturing on a surface of the external portion that is adjacent to the projection.

12. The syringe plunger as recited in claim 11 , wherein the internal portion and the external portion are perpendicular to the base and parallel to one another.

13. The syringe plunger as recited in claim 11 , wherein the base, the external portion, and the internal portion are formed from a common mold or print.

14. The syringe plunger as recited in claim 11 , wherein the external portion includes an indentation configured to fit over at least a portion of a guide on the outer surface of the syringe barrel so that the external portion slides along the guide in a longitudinal direction relative to the syringe barrel.

15. The syringe plunger as recited in claim 14 , wherein a cross-section of the indentation is polygonal.

16. The syringe plunger as recited in claim 15 , wherein the cross-section of the indentation is pentagonal.

Assignees

• Univ Nebraska

Inventors

• Suh Donny
• Linke Ronald
• Scherr Tyler

Classifications

• A61B5/150259

  Improved gripping, e.g. with high friction pattern or projections on the housing surface or an ergonometric shape · CPC title

• A61M5/31513 Primary

  Piston constructions to improve sealing or sliding · CPC title

• A61B5/150236

  Pistons, i.e. cylindrical bodies that sit inside the syringe barrel, typically with an air tight seal, and slide in the barrel to create a vacuum or to expel blood · CPC title

• A61B5/150244

  Rods for actuating or driving the piston, i.e. the cylindrical body that sits inside the syringe barrel, typically with an air tight seal, and slides in the barrel to create a vacuum or to expel blood · CPC title

• A61M5/31511

  Piston or piston-rod constructions, e.g. connection of piston with piston-rod (A61M5/5066 takes precedence) · CPC title