Retractable razor drill

Abstract

A razor drill for resecting bone inside a joint during arthroscopic surgery. The razor drill includes an inner assembly having an inner hub having an inner tube extending distally therefrom. The inner tube terminates in a distal bit. The razor drill also includes an outer assembly having an outer hub having an outer tube extending distally therefrom. The inner tube is movable within the outer tube between a retracted position and an extended position. The razor drill attachment includes a deployment mechanism connected to the outer hub. The deployment mechanism is movable in a first direction and a second direction. Moving the deployment mechanism in the first direction moves the inner tube to the elongated position, and moving the deployment mechanism in the second direction moves the inner tube to the retracted position.

Description

[0001] This application is a divisional application of an application with an application date of December 9, 2019, application number 201980082945.3 (international application number PCT / US2019 / 065143), and invention name “Retractable Razor Drill”.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This application claims priority to and the benefit of U.S. Provisional Patent Application No. 62 / 779,031, filed on December 13, 2018, and entitled “Retractable Shaver Bur.” Background Art 1. Technical Field

[0004] The present invention relates to a surgical cutting device, and more particularly, to a razor drill having a retractable drill bit.

[0005] 2. Related technologies

[0006] A razor bur is a surgical cutting instrument with sharp grooves that are intended to "shave" or remove bone within a joint during arthroscopic surgery. A surgical razor bur includes an inner component and an outer component. The outer component is composed of a hollow steel tube that is coupled to a molded plastic hub on the proximal end and contains a cutout or opening on the distal end. The inner component is housed within the outer component and includes an inner tube. The inner tube is composed of a hollow steel tube that is coupled to a molded plastic hub on the proximal end and welded to the razor bur on the distal end.

[0007] In use, the drill bit rotates forward, backward or oscillates while the outer component remains stationary. In a conventional razor drill, the drill bit is permanently exposed. As a result, during arthroscopic surgery, the sharp cutting edge of the drill bit occasionally and inadvertently contacts the articular surface within the joint space. Such contact may cause damage and injury to the patient at the surgical site.

[0008] Therefore, there is a need for a razor drill with a protectable drill bit to improve operating conditions.

[0009] Related Art Section Disclaimer Description: With respect to specific patents / publications / products discussed above in the Related Art Section Description or elsewhere in this disclosure, such discussion should not be considered an admission that the discussed patents / publications / products are prior art for patent law purposes. For example, some or all of the discussed patents / publications / products may not be sufficiently early in time, may not reflect subject matter that was developed early enough in time, and / or may not be sufficient to achieve prior art equivalents for patent law purposes. With respect to specific patents / publications / products discussed above in the Related Art Section Description and / or throughout the application, their descriptions / disclosures are incorporated herein by reference in their respective entireties. Summary of the invention

[0010] The present disclosure relates to a razor drill for removing bone inside a joint during arthroscopic surgery. According to one aspect, the razor drill includes an inner assembly having an inner hub, the inner hub having an inner tube extending distally therefrom. The inner tube terminates at a distal drill bit. The razor drill also includes an outer assembly having an outer hub, the outer hub having an outer tube extending distally therefrom. The inner tube is movable within the outer tube between a retracted position and an extended position. The razor drill additionally includes a deployment mechanism connected to the outer hub. The deployment mechanism is movable in a first direction and a second direction. Moving the deployment mechanism in the first direction moves the inner tube to the extended position, and moving the deployment mechanism in the second direction moves the inner tube to the retracted position.

[0011] According to another aspect, the razor drill includes an inner assembly having an inner hub with an inner tube extending distally therefrom. The inner tube terminates at a distal drill bit. The razor drill also includes an outer assembly having an outer hub with an outer tube extending distally therefrom. The inner tube is movable within the outer tube between a retracted position and an extended position. The razor drill additionally includes a magnet holder connected between the inner hub and the outer hub. The razor drill has a deployment mechanism connected to the outer hub. The deployment mechanism is movable in a first direction and a second direction. Moving the deployment mechanism in the first direction moves the inner tube to the extended position, and moving the deployment mechanism in the second direction moves the inner tube to the retracted position. Additionally, moving the deployment mechanism in the second direction moves the deployment mechanism against the magnet holder.

[0012] According to yet another aspect, the present invention is a method for resecting bone. The method comprises the following steps: (i) providing a razor drill, the razor drill comprising: an inner assembly having an inner collar having an inner tube extending distally therefrom, the inner tube terminating in a distal drill bit; an outer assembly having an outer hub having an outer tube extending distally therefrom, wherein the inner tube is located within the outer tube; and a deployment mechanism connected to the outer hub; (ii) moving the deployment mechanism in a first direction to extend the distal drill bit from the outer tube; (iii) resecting bone with the distal drill bit; and (iv) moving the deployment mechanism in a second direction to retract the distal drill bit into the outer tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be more fully understood and appreciated by reading the following detailed description in conjunction with the accompanying drawings. The accompanying drawings illustrate only typical embodiments of the disclosed subject matter and are therefore not to be considered limiting of its scope, as the disclosed subject matter may admit of other equally effective embodiments. Reference is now made briefly to the accompanying drawings, in which:

[0014] Figure 1 is a perspective schematic diagram of a razor drill according to an embodiment;

[0015] Figure 2 is a perspective schematic diagram of the inner components of a razor drill according to an embodiment;

[0016] Figure 3 is a perspective schematic diagram of an outer component of a razor drill according to an embodiment;

[0017] Figure 4 is an exploded perspective schematic diagram of an outer ring assembly of a razor drill according to an embodiment;

[0018] Figure 5 is a perspective schematic diagram of an inner rim coupled to an outer rim according to an embodiment;

[0019] Figure 6 is a schematic side view of a razor drill in a retracted position according to an embodiment; and

[0020] Figure 7 is a schematic side view of a razor drill in an extended position according to an embodiment. DETAILED DESCRIPTION

[0021] Referring now to the drawings, wherein like reference numerals refer to like parts throughout, Figure 1 A perspective schematic diagram of a retractable razor drill 10 according to an embodiment can be seen in FIG. The razor drill 10 includes a proximal outer hub assembly 12 having an outer tube 14 extending distally therefrom along a central longitudinal y-y axis (see also FIG. Figure 3).like Figure 1 As shown in FIG. 1 , the outer hub assembly 12 extends to and includes a proximal end 16, and the outer tube 14 extends to and includes a distal end 18 of the razor drill 10. The razor drill 10 includes a proximal inner assembly 20 coupled to a distal outer assembly 22.

[0022] Now go to Figure 2 , shows a perspective schematic diagram of the inner assembly 20 of the razor drill 10 according to an embodiment. The inner assembly 20 includes an inner hub 24 connected to a proximal end cap 26. In an embodiment, the proximal end cap 26 is removably attached to the inner hub 24. In an alternative embodiment, the proximal end cap 26 is coupled to the inner hub 24. Figure 2 As shown in FIG. 2 , the inner hub 24 and the proximal end cap 26 are generally cylindrical.

[0023] Still refer to Figure 2 , the inner hub 24 includes a cylindrical central body 28 having a central connecting tube 30 extending therefrom in a distal direction. The inner hub 24 also includes a key portion 32 extending from the central body 28 in a proximal direction. The key portion 32 includes one or more components 34 ( Figure 4 ).like Figure 2 As shown in FIG. 1 , the inner hub 24 is connected to the inner tube 36. Figure 2 , the central connecting tube 30 extending distally from the inner hub 24 is hollow and is configured or otherwise adapted to receive an inner tube 36. In the depicted embodiment, the inner tube 36 is solid. The inner tube 36 may be constructed of steel and / or other similar hard metals. The inner tube 36 extends to and includes a distal drill bit 38. During arthroscopic surgery, the drill bit 38 is used to shave or remove bone inside the joint.

[0024] Now go to Figure 3 , shows a perspective schematic diagram of the outer assembly 22 of the razor drill 10 according to an embodiment. The outer assembly 22 includes a cylindrical outer hub 40 connected to the hollow outer tube 14. As described above, the hollow outer tube 14 extends distally from the outer hub 40. In an embodiment, the outer hub 40 is coupled to the hollow outer tube 14. The hollow outer tube 14 includes an open distal end 42. In the depicted embodiment, the open distal end 42 is angled so that a plane x-x extending above the open distal end 42 is angled relative to the central longitudinal y-y axis. In the depicted embodiment, the plane a-a is at an angle of less than 90 degrees relative to the central longitudinal y-y axis.

[0025] Now go to Figure 4, shows an exploded perspective schematic diagram of the outer hub assembly 12 according to an embodiment. As described above, the outer hub assembly 12 includes the inner hub 24 of the inner assembly 20 and the outer hub 40 of the outer assembly 22. Between the inner hub 24 and the outer hub 40 is a magnet holder 44. The magnet holder 44 is cylindrical and has a central hole 46 extending therethrough. The magnet holder 44 additionally includes one or more rods 48 (e.g., rods) extending distally therefrom. Figure 4 As shown in FIG. 4 , a rod 48 extends from a distal end 50 of the magnet holder 44 toward the outer hub 40. The purpose of the magnet holder 44 is to allow identification of the type of blade or drill bit used with a handpiece (not shown) connected to the outer hub assembly 12. The magnet holder 44 can transmit information to the handpiece and a connected control system (not shown) so that the control system can generate appropriate signals to optimize the accessory for certain procedures that require varying speeds and torques. The signal can also change the operation of a button on the handpiece (e.g., toggle, momentary on / off, etc.).

[0026] Reference now Figure 5 , shows a perspective schematic diagram of the inner rim 24 coupled to the outer rim 40 according to an embodiment. Figure 5 As shown in FIG. 1 , the inner hub 24 is coupled to the outer hub 40 with a magnet retainer 44 therebetween. The outer hub 40 includes one or more slots 52 ( 54 ) extending at least partially therethrough along a central longitudinal y-y axis. Figure 4 In the depicted embodiment, the slot 52 extends completely through the outer hub 40. When the outer hub assembly 12 is assembled, the central connecting tube 30 of the inner hub 24 extends through the central hole 46 of the magnet holder 44 ( Figure 4 ). The one or more rods 48 of the magnet holder 44 extend into the one or more slots 52 of the outer hub 40. The outer hub 40 includes a central bore 64 that is configured or otherwise adapted to receive the inner tube 36.

[0027] Back to Figure 4 , the outer hub assembly 12 additionally includes a deployment mechanism 54. In the depicted embodiment, the deployment mechanism 54 is a torsion ring. The torsion ring 54 is a rotatable circular member, such as a disk, cover, or plate. In the depicted embodiment, the torsion ring 54 is a rotatable cylindrical disk having a central hole 56 extending therethrough. The torsion ring 54 is attached to the distal end 58 of the outer hub 40 and is adjacent to (or proximate to) one or more rods 48 of the magnet holder 44. The torsion ring 54 is used to extend and retract the distal drill bit 38 ( Figure 1 ).exist Figure 4 In the embodiment of the present invention, the torsion ring 54 includes a plurality of ridges 60 extending along its outer circumference 62. The ridges 60 allow a user to obtain a firm grip on the torsion ring 54 to rotate it.

[0028] Reference now Figure 6 and Figure 7 , shows a schematic side view of a razor drill 10 in a retracted position and an extended position, respectively, according to an embodiment. Figure 6 As shown in FIG. 1 , in the retracted position, the inner tube 36 with the distal drill bit 38 is retracted and protected within the outer tube 14. From the retracted position, the torsion ring 54 is rotated in a first direction (e.g., counterclockwise). As the torsion ring 54 is rotated in the first direction, the inner assembly 20 moves axially along the central longitudinal y-y axis toward the distal end 42 of the outer tube 14, sliding the inner tube 36 distally from the outer tube 14. Figure 7 As shown in FIG. 8 , the torsion ring 54 is rotated in a first direction until the drill bit 38 is exposed and ready for use.

[0029] When use of the drill bit 38 is complete, the torsion ring 54 is rotated in a second direction (e.g., clockwise). As the torsion ring 54 is rotated in the second direction, the torsion ring 54 pushes on one or more rods 48, which in turn engage the inner assembly 20. Specifically, the rods 48 on the magnet holder 44 engage and move axially and proximally along the central longitudinal y-y axis toward the proximal end 16 of the razor drill 10. The magnet holder 44 engages the inner hub 24 coupled to the inner tube 36. The entire inner assembly 20 (including the drill bit 38) moves axially toward the proximal end 16 of the razor drill 10. Therefore, as shown in FIG. Figure 7 As shown in FIG. 8 , the drill bit 38 is fully retracted into the outer tube 14 .

[0030] Using the torsion ring 54 as a deployment mechanism allows the user to make fine adjustments, thereby allowing the drill bit to be fully exposed, fully retracted, or in some positions in between. In alternative embodiments, the torsion ring 54 may also include a knob or other handle-shaped component for rotating the torsion ring 54. In another embodiment, the deployment mechanism 54 is a lever or latch assembly that moves the drill bit 38 from the retracted position to the extended position when it moves from the first position to the second position. In yet another embodiment, the deployment mechanism 54 is an on / off button or an actuator button that moves the drill bit 38 from the retracted position to the extended position when pressed. Similarly, the on / off button can be operated so that it must remain in a pressed state to maintain the drill bit 38 in the extended (or retracted) position. In an additional embodiment, the deployment mechanism 54 is a release ring that is pulled in the proximal direction to move the outer tube 14 proximally on the inner tube 36 to expose the drill bit 38, or the inner tube 36 is moved out of the outer tube 14 in the distal direction to expose the drill bit 38. The release ring (as well as other embodiments of the deployment mechanism 54) may be used in conjunction with a locking mechanism that locks the razor drill 10 in the retracted and / or extended positions.

[0031] Although embodiments of the present invention have been specifically shown and described with reference to certain exemplary embodiments, it will be understood by those skilled in the art that various changes in detail may be made therein without departing from the spirit and scope of the present invention as defined by the claims supported by the written description and the accompanying drawings. In addition, where exemplary embodiments are described with reference to a certain number of elements, it will be understood that the exemplary embodiments may be practiced with less than or greater than the certain number of elements.

Claims

1. A razor drill, comprising: an inner assembly having an inner hub with an inner tube extending distally therefrom; an outer assembly having an outer hub with an outer tube extending distally therefrom; wherein the inner tube is movable within the outer tube between a retracted position and an extended position; a retainer connected between the inner hub and the outer hub; a deployment mechanism connected to the outer hub, the deployment mechanism movable in a first direction and a second direction; and wherein the outer hub includes one or more slots extending at least partially through the outer hub, wherein the holder comprises one or more rods extending from the holder, wherein each of the one or more rods extends through one of the one or more slots in the outer hub, wherein the deployment mechanism abuts the one or more rods of the retainer, Wherein, moving the deployment mechanism in a first direction moves the inner tube to the extended position, and moving the deployment mechanism in a second direction moves the inner tube to the retracted position and axially moves the inner assembly in a proximal direction.

2. The razor drill of claim 1, wherein the inner tube terminates in a distal drill bit, and wherein in the extended position, the distal drill bit extends from the outer tube.

3. The razor drill of claim 1, wherein the inner tube terminates in a distal drill bit, and wherein in the retracted position, the distal drill bit is located within the outer tube.

4. The razor drill of claim 1, wherein the outer tube has a distal end, and wherein the distal end is angled relative to a central longitudinal axis extending through the outer tube.

5. The razor drill of claim 1, wherein the deployment mechanism is a disk rotatable in the first direction and the second direction.

6. The razor drill of claim 5, further comprising a plurality of ridges located on an outer circumference of the disk.

7. The razor drill of claim 1, wherein the inner hub and the outer hub are generally cylindrical.

Images