Vertebral Disc Auger

Abstract

A medical instrument for shaving, collecting, and removing vertebral disc material from a vertebral disc space of a spine, has a shaft defining a proximal shaft end and a distal shaft end, and an auger at the distal shaft end. The auger has a plurality of helical cutting flutes configured to shave and collect vertebral disc material from the vertebral disc through rotation of the auger. Each helical cutting flute has a cutting apex that together define a cutting tip, and a radially inward helical slot that collectively define an internal cavity for collection of cut vertebral disc material. The plurality of cutting apexes converge at the cutting tip, defining a point. The medical instrument includes a connector to allow attachment of a handle. A notch in the proximal shaft end that receives a flange of the handle prevents rotation of the handle relative to the auger.

Claims

1. A medical instrument for obtaining vertebral disc material from a vertebral disc in a vertebral disc space of a spine during a surgical spine procedure, the medical instrument comprising: a shaft having a proximal shaft end and a distal shaft end; a handle portion at the proximal shaft end; and an auger formed at the distal shaft end, the auger having a plurality of helical cutting flutes configured to shave and collect vertebral disc material from a vertebral disc in a vertebral disc space of a spine through rotation of the shaft, each one of the plurality of helical cutting flutes having a cutting apex that all together define a cutting tip, with each one of the plurality of helical cutting flutes having a radially inward helical slot that collectively define an internal cavity in the auger for collection of cut vertebral disc material.

2. The medical instrument of claim 1, wherein the plurality of cutting apexes converge at the cutting tip to define a point.

3. The medical instrument of claim 2, wherein the plurality of helical cutting flutes comprises three helical cutting flutes.

4. The medical instrument of claim 1, wherein the handle portion comprises a handle.

5. The medical instrument of claim 1, wherein: the handle portion comprises a cylindrical body defining a proximal cylindrical body end and a distal cylindrical body end with the distal cylindrical body end connected to the distal shaft end; and the proximal cylindrical body end has a connector configured to allow attachment of a handle to the handle portion.

6. The medical instrument of claim 5, wherein the proximal cylindrical body end has a notch that receives a flange of the handle for preventing rotation of the handle relative to the cylindrical body.

7. The medical instrument of claim 6, wherein the proximal cylindrical body end has depth markings.

8. The medical instrument of claim 1, wherein the auger extends from a neck at the distal shaft end with each one of the plurality of helical cutting flutes having a proximal end that extends from the neck, each one of the proximal ends of the helical cutting flutes having a surface sloped radially inward from the neck.

9. A method of removing vertebral disc material from a vertebral disc in a vertebral disc space of a spine comprising: providing an incision in a patient proximate a vertebral disc to be cut; inserting a tube having a proximal tube end and a distal tube end into the incision such that the distal tube end is proximate to the vertebral disc to be cut; providing a medical instrument having a shaft defining a proximal shaft end and a distal shaft end, a handle portion at the proximal shaft end, and an auger formed at the distal shaft end, the auger having a plurality of helical cutting flutes configured to shave and collect vertebral disc material from a vertebral disc in a vertebral disc space of a spine through rotation of the shaft, each one of the plurality of helical cutting flutes having a cutting apex that all together define a cutting tip, with each one of the plurality of helical cutting flutes having a radially inward helical slot that collectively define an internal cavity in the auger for collection of cut vertebral disc material; and placing the medical instrument into and through the tube such that the auger extends from the distal tube end and is adjacent the vertebral disc to be cut; rotating the medical instrument to rotate the auger into the vertebral disc to cut vertebral disc material from the vertebral disc; and removing the medical instrument from the tube.

10. The method of claim 9, wherein the plurality of cutting apexes converge at the cutting tip to define a point.

11. The method of claim 10, wherein the plurality of helical cutting flutes comprises three helical cutting flutes.

12. The method of claim 9, wherein the handle portion comprises a handle.

13. The method of claim 9, wherein: the handle portion comprises a cylindrical body defining a proximal cylindrical body end and a distal cylindrical body end with the distal cylindrical body end connected to the distal shaft end; and the proximal cylindrical body end has a connector configured to allow attachment of a handle to the handle portion.

14. The method of claim 13, wherein the proximal cylindrical body end has a notch that receives a flange of the handle for preventing rotation of the handle relative to the cylindrical body.

15. The method of claim 13, wherein the proximal cylindrical body end has depth markings.

16. The method of claim 9, wherein the auger extends from a neck at the distal shaft end with each one of the plurality of helical cutting flutes having a proximal end that extends from the neck, each one of the proximal ends of the helical cutting flutes having a surface sloped radially inward from the neck.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention and its features will be better understood by reference to the accompanying drawings, wherein:

[0014] FIG. 1 is a side view of a medical instrument for removing vertebral disc material from a vertebral disc space of a spine fashioned in accordance with the present principles;

[0015] FIG. 2 is an enlarged view of a distal end of the medical instrument of FIG. 1 particularly depicting a head thereof in the form of an auger;

[0016] FIG. 3 is an enlarged view of the auger of the medical instrument of FIG. 1;

[0017] FIG. 4 is another enlarged view of the auger of the medical instrument of FIG. 1 rotated 90° with respect to the view of FIG. 4; and

[0018] FIG. 5 is an enlarged view of a tip of the auger of the medical instrument of FIG. 1.

[0019] For the purposes of promoting an understanding of the principles of the invention reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended. Any alterations and further modifications in the described embodiment, and any further applications of the principles of the invention as described herein are contemplated as would normally occur to one skilled in the art to which the invention relates.

DETAILED DESCRIPTION OF THE INVENTION

[0020] Referring to FIGS. 1-5, there is shown a medical instrument, generally designated 10, for removing vertebral disc material (not shown), typically from within a disc space (not shown) between adjacent vertebrae (not shown) of a spine during a surgical spine procedure, particularly, but not necessarily, in minimally invasive or micro invasive surgery (MIS) via a cannula, endoscopic, tube, or the like, or a similar spine procedure. The present medical instrument 10 may be used in surgical procedures other than MIS procedures. The medical instrument 10 is fashioned from one or more surgical grade materials.

[0021] FIG. 1 depicts an overall view of the medical instrument 10, also termed a vertebral disc auger. The vertebral disc auger 10 has a proximal end 12 configured as to define a handle or handle receptor (collectively, handle 12), a shaft 14 connected to a distal end 20 of the handle 12, and a head 16 fashioned as an auger connected to a distal end of the shaft 14 through a neck 24. The handle 12 is characterized by a cylindrical body 18 sized to accommodate a hand (not shown) or a handle via a generally conical connector 19 at a proximal end of the cylindrical body 18, and to the distal end 20. The connector 19 is configured to allow connection to a handle (not seen). Alternately, a handle (not seen) may be attached to the connector 19 as a permanent part of the vertebral disc auger 10, or the configuration as shown can be the handle. The cylindrical body 18 is shown with a notch 21 that is configured to receive a handle. The cylindrical body 18 may have additional notches (not shown) or other configuration(s) that would be designed to receive a handle. The notch 21 (and any additional notches/configuration(s)) provide anti-rotation of a handle with respect to the cylindrical body 18 such that rotation of the handle will rotate the shaft 14 and auger 16. The distal end 20 of the cylindrical body 18 is generally planar and can serve as a stop against further insertion into an MIS tube, endoscope, cannula, or the like (not shown, and collectively “cannula”) during use. Rotation of the cylindrical body 18 rotates the shaft 14 and thus the auger 16.

[0022] FIGS. 2-4 depict various views of the auger 16. The auger 16 is configured to cut, shave, or otherwise remove vertebral discs/disc material (not shown) from a spine (not shown), collect the shaven vertebral disc material, and remove the collected vertebral disc material. Cutting and collecting the vertebral disc material is accomplished by rotation of the auger 16. Removal of the vertebral disc material is accomplished by removing the auger 16 from the vertebral disc space and from the cannula.

[0023] The auger 16 has a plurality of helical cutting flutes or blades for slicing into vertebral disc material. In the embodiment shown in the figures, the auger 16 has three (3) helical cutting flutes 27, 28, 29. Each helical cutting flute 27, 28, 29 extends from a respective sloped surface 32, 33, 34 at a distal end of the neck 24, winds or spirals around the auger 16, relative to a longitudinal axis of the shaft 14, and terminates in a cutting tip 25. Each flute spirals or twists 120° from its apex (sloped surfaces) along the longitudinal axis of the shaft 14. Other numbers of cutting flutes may be provided as well as the amount of twist along the longitudinal axis of the shaft 14. Upon rotation of the auger 16, the helicity of the cutting flutes aid in advancing the auger into the disc material by creating a pathway. Each helical cutting flute 27, 28, 29 has a respective helical slot 42, 43, 44 that is situated radially inward of an outer diameter of the auger 16. The helical slots 42, 43, 44 form, or at least partially form, an internal central cavity 36 within the auger 16. The central cavity 36 collects cut/shaven disc material for removal. Removal is accomplished by extracting the auger 16 from the vertebral disc space and the body.

[0024] FIG. 5 depicts an enlarged view of the cutting tip 25 as viewed from the distal end of the auger 16. The helical cutting flute 27 terminates at its distal end in a cutting apex 38. The helical cutting flute 28 terminates at its distal end in a cutting apex 39. The helical cutting flute 29 terminates at its distal end in a cutting apex 40. The cutting apexes 38, 39, 40 converge to form the cutting tip 25.

[0025] In use, as the auger 16 advances forward into the disc material through rotation of the proximal end 12/shaft 14, the helical cutting flutes 27, 28, 29 collect disc material into the helical slots 42, 43, 44/central cavity 36 for the purpose of removing the disc material.

[0026] The shaft 14 is shown with depth markings 22 on its outside diameter for assisting with depth reference within a patient. Other types of depth markings/references may be used.

[0027] While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only a preferred embodiment has been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected. It should be understood that while the use of words such as preferable, preferably, preferred or more preferred utilized in the description above indicate that the feature so described may be more desirable, it nonetheless may not be necessary and embodiments lacking the same may be contemplated as within the scope of the invention.