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EP-4331511-B1 - MICRODEBRIDER WITH STABILITY INTERFACE BUSHING

EP4331511B1EP 4331511 B1EP4331511 B1EP 4331511B1EP-4331511-B1

Inventors

  • TURANO, BO D.
  • PAPENFUSS, ERIK

Dates

Publication Date
20260513
Application Date
20230824

Claims (13)

  1. A system for removing tissue or bone including a blade (400), the blade comprising: an outer tube (450) including a longitudinal axis defined therealong, the outer tube including a distal end defining an inner lip (451); a middle tube (430) concentrically disposed within the outer tube, the middle tube including an opening (435) having a series of teeth (431) at a distal end thereof and a shoulder (437) formed on an outer surface (430a) thereof; an inner tube (440) concentrically disposed within the middle tube including an opening (445) having a series of teeth (441) at a distal end thereof in longitudinal registration with the opening in the middle tube, the inner tube being configured to couple to a power source (162) such that, upon activation thereof, the inner tube rotates relative to the middle tube and the series of teeth of the inner tube cooperates with the series of teeth of middle tube to cut tissue or bone disposed in a cutting window defined between the openings (435, 445); and a bushing (500) disposed on the outer surface of the middle tube in abutting relation against the shoulder, such that, upon assembly, the bushing seats between the shoulder of the middle tube and the inner lip of the outer tube.
  2. The system for removing tissue or bone according to claim 1, wherein the distal end of the outer tube (450) is rolled and reamed to form the inner lip (451).
  3. The system for removing tissue or bone according to any of the preceding claims, wherein the inner tube (440) defines a lumen (443) allowing for drawing debris therethrough along a suction path via a suction source (172) .
  4. The system for removing tissue or bone according to any of the preceding claims, wherein a channel is defined between the outer diameter of the inner tube (440) and the inner diameter of the middle tube (430) allowing for supplying a fluid from a fluid source (152) to the opening (435) of the middle tube and the opening (445) of the inner tube.
  5. The system for removing tissue or bone according to any of the preceding claims, further comprising a microdebrider (700) with a housing (704), the microdebrider being configured to operably engage the blade (400).
  6. The system for removing tissue or bone according to claim 5, further comprising a rotation wheel (710) disposed atop the housing (704), the rotation wheel being configured to permit 360° of selective orientation of the cutting window between the opening (435) of the middle tube (430) and the opening (445) of the inner tube (440) without requiring a reorientation of the microdebrider (700).
  7. The system for removing tissue or bone according to claim 6, wherein the bushing (500) is configured to maintain the stability of the interface between the outer tube and the middle tube when the rotation wheel (710) is rotated.
  8. The system for removing tissue or bone according to any of the preceding claims, wherein the blade (400) is configured to be used in conjunction with a navigation system.
  9. The system for removing tissue or bone according to claim 8, wherein the bushing is configured to enhance the interface between the outer tube (450) and the middle tube (430) allowing the blade (400) to have a blade angle to about 90° without affecting the stability of the navigation system (600).
  10. The system for removing tissue or bone according to any of the preceding claims, wherein the bushing (500) comprises a distal facing surface (502b) abutting the inner lip (451) and a proximal facing surface (502b) being maintained by the shoulder (437) thereagainst.
  11. The system for removing tissue or bone according to any of claims 5 to 10, wherein the outer tube (450) is extending from the housing (704).
  12. The system for removing tissue or bone according to any of the claims 5 to 11, wherein the housing (704, 204) is connected to the power source (162), the fluid source (152) and the suction source (172); and wherein the housing includes an adapter configured to operably connect to the blade (400), the blade being selectively removable.
  13. The system for removing tissue or bone according to any of the claims 6 to 12, wherein the rotation wheel (710) is configured to permit selective orientation of the cutting window between respective openings (435, 445) between the middle tube (430) and inner tube (440) 360° of rotation without repositioning the outer tube.

Description

FIELD The present disclosure is generally directed to devices and systems for cutting and treating tissue, such as bone and soft tissue. The present disclosure may be particularly suitable for sinus applications and nasopharyngeal/laryngeal procedures. BACKGROUND Devices and systems in accordance with the present disclosure may be suitable for a variety of procedures including ear, nose and throat (TINT) procedures, head and neck procedures, otology procedures, including otoneurologic procedures. Other surgical procedures suitable for use with the devices described herein include: mastoidectomies; nasopharyngeal and laryngeal procedures such as tonsillectomies, tracheal procedures, adenoidectomies, laryngeal lesion removal, and polypectomies; for sinus procedures such as polypectomies, septoplasties, removals of septal spurs, antrostomies, frontal sinus trephination and irrigation, sinus opening, endoscopic DCR, correction of deviated septums and trans-sphenoidal procedures; rhinoplasty and removal of fatty tissue in the maxillary and mandibular regions of the face. Of particular significance is the usefulness of the devices and systems described herein with sinus surgery which is often challenging due to the obvious location of the sinus cavity to sensitive organs such as the eyes and brain. Moreover, the relatively small size of the anatomy of interest to the surgeon and the complexity of the typical procedures places a heavy emphasis on precision. Examples of debriders with mechanical cutting components are described in commonly-owned U.S. Patent Nos.: 5,685,838, 5,957,881; and 6,293,957, The Medtronic Straightshot® Microdebriders, e.g., Medtronic Straightshot® RAD40 or RAD60 Microdebriders, use sharp cutters to cut tissue, and suction to withdraw tissue. While tissue debridement with the Medtronic microdebrider systems is a simple and safe technique, the blade angle of the middle tube and the concentric inner rotating tube of these devices relative to the outer tube may vary from about 12 degrees to about 120 degrees Depending on the angle, the middle tube and the inner tube may extend several centimeters from the distal end of the outer tube, which in some instance can promote instability especially when the inner tube is rotating at high rpms and encountering heavy tissue or bone. Moreover, since one of the unique advantages of the Medtronic Straiglitsliot' Microdebriders is the ability to rotate the cooperating inner and middle cutting tubes 360 degrees to excise tissue and bone without rotating the outer tube, the forces associated with cutting tissue or bone in one rotational position may place more stress on the middle tube and outer tube interface than a different rotational position, As such, a need exists to provide a stabilizing interface between the middle and outer tubes for all blade angles that works during all cutting rotational positions. US 2021/282799 A1 relates to a cutting assembly for surgical instrument with clog-reducing hub. US 5618293 A relates to a surgical instrument. US 2021/015821 A1 relates to arthroscopic devices and methods. US 6007556 A relates to a surgical irrigation pump and tool system. SUMMARY The invention is defined by the appended claims. Examples disclosed herein that do not fall under the subject-matter of the appended claims are useful to understand the invention. Provided in accordance with the present disclosure is a device for removing tissue or bone including a housing having an outer tube extending therefrom having a longitudinal axis defined therealong, the outer tube including a distal end defining an inner lip. A middle tube is operably supported concentrically within the outer tube, the middle tube including an opening having a series of teeth at a distal end thereof and a shoulder defined around an outer peripheral surface thereof An inner tube is concentrically disposed within the middle tube and includes an opening having a series of teeth at a distal end thereof in longitudinal registration with the opening in the middle tube. The inner tube is adapted to couple to a power source such that, upon activation thereof, the inner tube rotates relative to the middle tube and the series of teeth of the inner tube cooperate with the series of teeth of middle tube to cut tissue or bone disposed in a cutting window between the openings defined therebetween. A bushing is disposed atop the middle tube in abutting relation against the shoulder, such that, upon assembly, the bushing seats between the shoulder of the middle tube and the inner lip of the outer tube. In aspects according to the present disclosure, a device for removing tissue or bone includes a housing having an outer tube defining an inner lip. A middle tube is supported within the outer tube and includes an opening having teeth at a distal end thereof and a shoulder defined around an outer surface thereof proximate the opening. An inner tube is disposed within the middle tube and includes an ope