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EP-3968874-B1 - POWERED SURGICAL DRILL HAVING ROTATING FIELD BIT IDENTIFICATION

EP3968874B1EP 3968874 B1EP3968874 B1EP 3968874B1EP-3968874-B1

Inventors

  • Lambert, Trevor Jonathan
  • CARUSILLO, STEVEN, J.
  • SHARMA, RAHUL
  • SCHNEIDER, Brendan

Dates

Publication Date
20260506
Application Date
20200515

Claims (15)

  1. A drill bit (66) for use on a surgical drill (61), the drill bit (66) comprising: a shank (176) extending between a proximal end (178) and a distal end (180) along an axis (AX); a cutting tip portion (70) adjacent to the distal end (180) of the shank (176); and an identification feature (177) disposed about the shank (176) for identifying a configuration of the cutting tip portion (70), the identification feature (177) comprising a magnetic material configured for generating a magnetic field, the magnetic material configured to become at least partially demagnetized when heated to a temperature at or above 80 degrees Celsius; further comprising a sleeve (179) disposed about at least a portion of the shank (176), the sleeve (179) comprising a non-magnetic material; wherein the sleeve (179) comprises the identification feature (177), with the magnetic material being dispersed in the non-magnetic material; and wherein the magnetic material is uniformly dispersed in the non-magnetic material such that no portion of the sleeve (179) is more heavily concentrated with magnetic material than other portions.
  2. The drill bit (66) of claim 1, wherein the magnetic material comprises an array of magnets (181) disposed circumferentially about the shank (176).
  3. The drill bit (66) of claim 2, wherein at least one magnet (181) of the array of magnets (181) is different in size, strength, polarity, angular spacing, or combinations thereof than at least one other magnet (181) of the array of magnets (181).
  4. The drill bit (66) of any one of claims 2-3, wherein angular spacing between a first magnet (181) of the array of magnets (181) and a second magnet (181) of the array of magnets (181) is the same as angular spacing between the second magnet (181) and a third magnet (181) of the array of magnets (181).
  5. The drill bit (66) of any one of claims 2-3, wherein angular spacing between a first magnet (181) of the array of magnets (181) and a second magnet (181) of the array of magnets (181) is different than angular spacing between the second magnet (181) and a third magnet (181) of the array of magnets (181).
  6. The drill bit (66) of any one of claims 2-5, wherein a size of a first magnet (181) of the array of magnets (181) is greater than a size of a second magnet (181) of the array of magnets (181).
  7. The drill bit (66) of any one of claims 2-6, wherein a strength of a first magnet (181) of the array of magnets (181) is greater than a strength of a second magnet (181) of the array of magnets (181).
  8. The drill bit (66) of any one of claims 2-7, wherein the array of magnets (181) is further defined as a first array of magnets (181), and wherein the magnetic material comprises a second array of magnets disposed circumferentially about the shank (176) and disposed axially spaced from the first array of magnets (181).
  9. The drill bit (66) of claim 8, wherein each of the first array of magnets (181) and the second array of magnets comprises the same number of magnets.
  10. The drill bit (66) of any one of claims 8-9, wherein at least one magnet (181) of the first array of magnets (181) is angularly aligned with a magnet in the second array of magnets in a direction parallel to the axis (AX) of the shank (176).
  11. The drill bit (66) of any one of claims 8-10, wherein at least one magnet (181) in the first array of magnets is not angularly aligned with any of the magnets in the second array of magnets in a direction parallel to the axis (AX) of the shank (176).
  12. The drill bit (66) of any one of claims 1-11, wherein the magnetic material comprises solid particles or flakes.
  13. The drill bit (66) of any one of claims 1-12, wherein the magnetic material comprises a neodymium magnet or a samarium-cobalt magnet.
  14. The drill bit (66) of any one of claims 1-13, wherein the magnetic material comprises iron.
  15. The drill bit (66) of any one of claims 1-14, wherein the non-magnetic material comprises a polymeric material.

Description

Background One type of powered surgical tool, or powered surgical system, used in orthopedic surgery is the surgical drill. This type of tool includes a housing that contains a motor. A coupling assembly or coupling, also part of the drill, releasably holds a drill bit to the motor so that, upon actuation of the motor, the drill bit rotates. As implied by its name, a surgical drill drills bores in the workpiece, such as tissue, against which the drill bit is applied. One type of surgical procedure in which it is necessary to drill a bore is a trauma procedure to repair a broken bone. In this type of procedure, an elongated rod, sometimes called a nail, is used to hold the fractured sections of the bone together. To hold the nail in place, one or more bores are driven into the bone. These bores are positioned to align with complementary holes formed in the nail. A screw is inserted in each aligned bore and nail hole. The screws hold the nail in the proper position relative to the bone. In another type of procedure, an implant, or workpiece, known as a plate is secured to the outer surfaces of the fractured sections of a bone to hold the sections together. Screws hold the plate to the separate sections of bone. To fit a screw that holds a plate to bone it is necessary to first drill a bore to receive the screw. As part of a procedure used to drill a screw-receiving bore in a bone, it is desirable to know the end-to-end depth of the bore. This information allows the surgeon to select the size of a screw that is fitted in the bore hole. If the screw is too short, the screw may not securely hold the nail into which the screw is inserted in place. If the screw is too long, the screw can extend an excessive distance out beyond the bone. If the screw extends an excessive distance beyond the bone, the exposed end of the screw can rub against the surrounding tissue. If this event occurs, the tissue against which the screw rubs can be damaged. Accordingly, an integral part of many bone bore-forming procedures is the measuring of the depth of the bore. The present disclosure addresses some of these issues. Document US 2014/275955 A1 discloses a guided surgical tool assembly with a guide tube including a sensor, a surgical instrument including a detectable feature moveable within the guide tube, and the sensor capable of detecting the detectable feature when the surgical instrument is inserted in the guide tube. Document US 2017/290602 A1 discloses arthroscopic cutters that are used for resecting tissues, such as meniscal tissues, in meniscectomies or other arthroscopic procedures. The arthroscopic cutters have a shaft assembly with openable-closeable jaws at a working end of the shaft. A handpiece having a motor drive may be detachably coupled to a hub on a hub end of the handpiece. When the shaft is coupled to the handpiece, the motor drive will couple to the jaw structure to open and close the jaw structure to cut meniscal and other tissues. Document WO 2019/040381 A1 discloses a fluid management system. The system includes a pump connectable to a fluid source. An inflow line removably connects to a cannula for delivering a fluid flow from the pump into a surgical site, such as a joint cavity. A flow pressure sensor is coupled to measure flow pressure in the inflow line and produce a measured pressure value. A controller is connected to the pump and the flow pressure sensor, and the controller maintains a pressure set point by controlling a pump speed based on a backpressure-adjusted pressure value, BAPV, calculated by subtracting a backpressure value selected from a backpressure table from the measured pressure value. The BAPV is monitored to determine whether the BAPV deviates outside an initial BAPV range, and corrective measure are taken should such deviations occur. Brief description of the drawings Figure 1 is perspective view of a surgical system comprising a surgical instrument and end effector, the end effector shown having a drill bit having an identification feature and a tip protector according to one configuration.Figure 2 is a partially-exploded perspective view of the surgical system of Figure 1, with the surgical instrument shown having a measurement module, a drive assembly, and a release mechanism spaced from a handpiece body, and with the end effector removed from the surgical instrument and shown with the tip protector spaced from a distal cutting tip portion of the drill bit.Figure 3 is a partially-exploded perspective view of portions of the surgical instrument of Figures 1-2, shown with the drive assembly and the release mechanism spaced from a phantom outline of the handpiece body to depict an actuator assembly.Figure 4 is a partial isometric sectional view taken along line 4-4 in Figure 1 illustrating the arrangement of the identification feature and the sensor located within the measurement module.Figure 5 is a sectional view taken longitudinally through the surgical instrument of Figures 1-