High pressure cement injection device for bone repair

• US 6,217,581 B1
• Filed: 07/02/1999
• Issued: 04/17/2001
• Est. Priority Date: 10/18/1995
• Status: Expired due to Fees

• Current Assignee: John Thomas Tolson
• Original Assignee: John Thomas Tolson
• Inventors: Tolson, John Thomas
• Primary Examiner(s): Mancene, Gene
• Assistant Examiner(s): Priddy, Michael B.
• Application Number:
  US09/346,861
• Time in Patent Office: 655 Days
• Field of Search: 606/86, 606/92, 606/93, 606/94, 606/95
• US Class Current: 606/86.00R
• CPC Class Codes: A61B 17/8811 characterised by the introducer tip, i.e. the part inserted into or onto the bone
• CPC Class Codes: A61B 17/8816 characterised by the conduit, e.g. tube, along which fluid flows into the body or by conduit connections
• 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: B27G 1/00 Machines or devices for removing knots or other irregularities or for filling-up holes filling up cracks or holes in a veneer cutting block B27L5/00; caulking decks B63B5/065
• CPC Class Codes: B27G 11/00 Applying adhesives or glue to surfaces of wood to be joined

Abstract

An adaptor for injecting cement dispensed under high pressure from a cement gun into a bone cavity or into an interstice in a joint formed between a prosthetic pin and cement in the cavity, anchoring the pin in the cavity, to repair the joint has a shank portion with a self tapping external thread tapering from a connecting portion having an internal thread for attachment to a zerk, and radially outward wings, forming fingerpieces by which the shank portion can be rotated. An internal glue passageway extends completely through the adapter. A kit for injecting cement includes two adapters, a zerk, a high pressure lever action hydraulic gun for cement, two flexible connecting hoses, two plugs and a pressure release valve.

Claims

1. An adaptor for injecting cement dispensed under high pressure from a cement gun into a bone cavity or into an interstice in a joint formed between a prosthetic pin and cement in the cavity anchoring the pin in the cavity thereby to repair the joint comprising an elongate body with leading, penetrating and rear, connecting ends, the body having a pointed penetrating shank which tapers outward as it extends rearward from the leading end and is formed with an external self-tapping screw thread and a fingerpiece protruding radially outward adjacent the rear end comprising a pair of wings which protrude forward while diverging in opposite radial directions and an internal cement passageway extending axially completely through the body communicating with leading and rear ends, the rear end being provided with means for attachment to a zerk attached to a cement outlet of the gun so that, with the zerk attached to the rear end, the leading end can be manually screwed into sealing engagement with a bore tapped into the bone and an outlet hose of the cement gun secured to the zerk so that cement dispensed under high pressure from the gun will be injected through the adaptor into the cavity or interstice to fill and seal the interstice securing the pin in the bone cavity.

2. A kit for injecting cement into a bone cavity or into an interstice in a joint formed between a prosthetic pin and cement in a femur cavity anchoring the pin in the cavity thereby to fill the cavity and repairing the joint comprising a hydraulic, trigger action grease gun, two flexible hoses, a zerk, two adapters, two plugs and a pressure release valve, each adaptor comprising an elongate body with leading, penetrating and rear, connecting ends, the body having a pointed penetrating shank which tapers outward as it extends rearward from the leading end and is formed with an external screw thread and a fingerpiece protruding radially outward adjacent the rear end and an internal glue passageway extending axially completely through the body communicating with leading and rear ends, the rear end being formed with an internal screw thread for attachment to a zerk so that the adapters with one having a zerk attached to a rear end can be manually screwed into sealing engagement with respective bores tapped into a femur into communication with an interstice therein and one hose connected between an outlet of the grease gun and the zerk and the pressure release valve secured between the other adapter and the other hose so that cement dispensed under high pressure from the gun injected through the one adapter into the femur cavity will fill the interstice and seal the joint, with the adapters subsequently unscrewed from the respective bores and the plugs fitted in respective bores to seal the cavity.

3. In combination, an adaptor for injecting cement dispensed under high pressure from a cement gun into a bone cavity or into an interstice in a joint formed between a prosthetic pin and cement in the cavity anchoring the pin in the cavity thereby to re-cement and repair the joint and a zerk, the adaptor comprising an elongate body with leading, penetrating and rear, connecting ends, the body having a pointed penetrating shank which tapers outward as it extends rearward from the leading end and is formed with an external self-tapping screw thread and a fingerpiece comprising a pair of wings protruding radially outward adjacent the rear end and an internal cement passageway extending axially completely through the body communicating with leading and rear ends, the rear end being provided with an internal screw thread meshing with a complementary thread on the zerk to attach the zerk to the rear end thereof so that, when the zerk is attached to the cement outlet of the cement gun and to the rear end of the adaptor, the leading end can be manually screwed into sealing engagement with a bore tapped into the bone and an outlet hose of the grease gun secured to the zerk so that cement dispensed under high pressure from the gun will be injected through the adaptor filling the interstice, sealing and repairing the joint.

4. A kit for injecting cement dispensed under high pressure into a bone cavity or into an interstice in a joint formed between a prosthetic pin and cement in the cavity anchoring the pin in the cavity thereby to re-cement and repair the joint and comprising a hydraulic, trigger action grease gun operating at between 5000 and 11000 P.S.I.;

a flexible outlet hose for the grease gun, a zerk, and at least one adaptor comprising an elongate body with leading, penetrating and rear, connecting ends, the body having a pointed penetrating shank which tapers outward as it extends rearward from the leading end and is formed with an external screw thread and a fingerpiece protruding radially outward adjacent the rear end and an internal cement passageway extending axially completely through the body communicating with leading and rear ends, the rear end being formed with an internal screw thread for attachment to the zerk so that the adapter with a zerk attached to a rear end can be manually screwed into sealing engagement with a bore tapped into a bone joint to be recemented and the outlet hose of the grease gun secured to the zerk and cement dispensed under high pressure from the gun injected through the adapters to the joint to fill and seal the joint, the adapter unscrewed from the bore and the bore fitted with a plug.