Cannula having asymmetrically-shaped threads
AssigneeArthroCare Corporation
InventorsYves Arramon, George Delli-Santi
Life of this patent
Estimating the term…
Abstract
Methods and apparatus for performing a medical procedure which involves penetrating a bone structure are disclosed. According to one aspect of the present invention, a method for performing a surgical procedure includes introducing an assembly that includes a threaded cannula and a stylet into a bone structure. The threads have a shape that allows the cannula tip to be pushed into the bone body yet prevent the tip from being pulled out of the bone body. In one embodiment, the threads have a buttress shape. The method may also include applying a rotational motion, as for example a torque, to the threaded cannula to adjust the depth of insertion with respect to the implantation site when it is determined that the depth of insertion is to be adjusted.
Claims20
A method for performing a surgical procedure comprising:
- introducing an assembly into a bone structure, the assembly including a threaded cannula and a stylet positioned at least partially within an opening defined within the threaded cannula;
- and
- applying a rotational motion to the threaded cannula to adjust the depth of insertion with respect to an implantation site;
- wherein said threaded cannula comprises a thread having a shape that facilitates the cannula being pushed into the bone structure during the introduction step and for being driven into said bone structure during the applying step.
A cannula for use in a medical procedure, the cannula comprising:
- a distal end portion;
- and
- at least one asymmetric-shaped thread, the at least one asymmetric-shaped thread being disposed at the distal end portion.
A kit comprising:
- a cannula, the cannula including at least one asymmetric-shaped thread;
- a stylet adapted to fit within and be removed from said cannula;
- and
- a bone cement injection delivery system, said bone cement injection delivery system having a connector to fluidly connect said delivery system to said cannula such that bone cement may be delivered from said system through said cannula to a target site.
A method for performing vertebroplasty comprising:
- introducing an assembly into a vertebral body, the assembly including a cannula having threads with an asymmetric profile and a stylet positioned at least partially within an opening defined within the threaded cannula;
- removing the stylet from within the opening defined within the threaded cannula;
- coupling a bone cement delivery system to the threaded cannula;
- injecting bone cement through the threaded cannula into the implantation site using the bone cement delivery system;
- determining when a depth of insertion of the threaded cannula with respect to an implantation site of the vertebral body is to be adjusted;
- applying a rotational motion to the threaded cannula to adjust the depth of insertion with respect to the implantation site when it is determined that the depth of insertion of the threaded cannula with respect to the implantation site is to be adjusted;
- and
- withdrawing the threaded cannula from the vertebral body.
Dependencies are inferred from the claim text.