Curable material mixing and delivery device with cartridge

• US 20080116224A1
• Filed: 08/03/2007
• Published: 05/22/2008
• Est. Priority Date: 03/10/2006
• Status: Active Grant

• Current Assignee: Stryker Corporation
• Original Assignee: Carefusion 2200 Corporation (Becton, Dickinson & Co)
• Inventors: Massi, Shayna, Linderman, Evan D., Krueger, John A., Kantola, Jim, Plishka, Michael
• Granted Patent: US 8,021,037 B2
• Time in Patent Office: Days
• US Class Current: 222/192
• CPC Class Codes: A61B 17/8822 characterised by means facilitating expulsion of fluid from the introducer, e.g. a screw pump plunger, hydraulic force transmissions, application of vibrations or a vacuum
• CPC Class Codes: A61B 17/8827 with filtering, degassing, venting or pressure relief means
• CPC Class Codes: A61B 2017/8838 for mixing bone cement or fluid fillers
• CPC Class Codes: A61F 2002/3009 Transparent or translucent
• CPC Class Codes: A61F 2250/0071 breakable or frangible
• CPC Class Codes: A61F 2250/0091 transparent or translucent
• CPC Class Codes: B01F 2101/20 Mixing of ingredients for bone cement
• CPC Class Codes: B01F 27/1142 of the corkscrew type
• CPC Class Codes: B01F 33/50112 of the syringe or cartridge type
• CPC Class Codes: B01F 35/562 the mixer or mixing elements being collapsible, i.e. when discharging the products

Abstract

An apparatus and method for mixing two components and delivering the mixture to a patient. The apparatus contains a mixing chamber for mixing a liquid component and a powder component. The liquid component and powder component are mixed within the mixing chamber by rotation of a collapsible mixing element. A high strength cartridge capable of withstanding high opposing axial loads from the mixing chamber and a threaded rod generates force to drive the curable material from the mixing chamber. A plunger connected to the rod is then advanced through the mixing chamber to force the mixture out of the mixing chamber and deliver the mixture to the patient.

Claims

14. A method of dispensing curable material from a chamber comprising the steps of:

providing a housing defining a chamber diameter of at least about 0.600 inches, the chamber containing curable material;

engaging external threads on a rod with internal threads on a cartridge, the rod including a plunger operable to engage the curable material within the chamber; and

rotating the rod to move the rod axially with respect to the cartridge and drive the curable material from the chamber wherein opposing axial forces within the cartridge are generated of at least about 800 lbs.

1. A device for dispensing curable material comprising:

a chamber housing defining a chamber operable for holding curable material;

a rod with a plunger operable to engage the curable material within the chamber to dispense the curable material from the chamber when the plunger is advanced within the chamber;

a cartridge connected to the chamber housing, the cartridge defining a bore for receiving the rod, wherein the cartridge is subject to opposing axial forces by the chamber housing and the rod and elastically deforms in the axial direction when curable material is dispensed.

2. The device of claim 1 wherein the cartridge is capable of withstanding forces generated by dispensing the curable material of at least 800 lbs.

3. The device of claim 1 further comprising a handle housing for receiving the cartridge wherein the handle housing is not subject to opposing axial forces generated by the chamber housing and the rod.

4. The device of claim 1 further comprising a handle housing connected to the cartridge wherein a set of connection members between the handle housing and the cartridge are operable prevent relative rotational movement between the cartridge and the housing without transferring axial forces resulting from axial lengthening of the cartridge from the cartridge to the handle housing.

5. The device of claim 4 further comprising a second set of connection members that prevent relative axial movement between the cartridge and the handle housing.

6. The device of claim 5 wherein the second set of connection members comprises a plurality of connection members located in the same axial plane.

7. The device of claim 3 wherein the connection members comprise a rib and a slot.

8. The device of claim 1 wherein the rod and cartridge engage each other by a threaded arrangement.

9. The device of claim 8 wherein the threaded arrangement includes buttress threads.

10. The device of claim 8 wherein the rod comprises a non-threaded section between a first threaded section and a second threaded section.

11. The device of claim 1 wherein the plunger includes a resilient member.

12. The device of claim 11 wherein the plunger includes a larger diameter section, a smaller diameter section and a radial ridge, wherein the resilient member is located on the smaller diameter section and the radial ridge restricts axial motion of the resilient member.

13. The device of claim 1 further comprising a collapsible mixing element for mixing the curable material within the chamber.

15. The device of claim 14 wherein the chamber diameter is at least about 0.6875 inches.

16. The device of claim 14 further comprising the step of mixing curable material within the chamber with a collapsible mixing element.

17. A device for dispensing curable material from a chamber comprising:

a housing having a housing inner surface defining a chamber operable for holding curable material;

a plunger operable for engaging the curable material within the chamber to dispense the curable material from the chamber when the plunger is advanced within the chamber, the plunger including a resilient member;

wherein the inner surface of the housing defines a plurality of axially spaced portions within the chamber having different diameters including

a first portion having a diameter smaller than the diameter of the resilient member to form a seal between the resilient member and the inner surface and

a second portion having a diameter larger than the diameter of the resilient member to provide a clearance between the resilient member and the inner surface to allow gas to escape past the resilient member as the plunger is advanced within the chamber.

18. The device of claim 17 further comprising a third portion having a diameter smaller than the diameter of the resilient member to form a seal between the resilient member and the inner surface to drive curable member from the chamber as the rod is advanced within the chamber.

19. The device of claim 16 further comprising a fourth portion having a tapered diameter between the diameters of the second portion and the third portion.

20. The device of claim 16 further comprising a collapsible mixing element for mixing the curable material within the chamber.

17-1. The device of claim 16 further comprising a rod connected to the plunger wherein the rod includes a non-threaded section between a first threaded section and a second threaded section.