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Miniature Motors for Powered Surgical Screwdrivers

Powered Surgical Screwdrivers
Powered Surgical Screwdrivers

Challenge 

Securing implants and wire meshes to bone during reconstructive or plastic surgery often requires fastening screws. Using manual screw drivers, this tedious process can present ergonomic issues for surgeons and account for a significant portion of the total OR time required for the procedure. Furthermore, surgeons must rely on their own sense of force applied to determine when the screw is completely seated. Driving the screw too far results in bone stripping which reduces the holding force of the screw and causes additional trauma for the patient. Motorizing the surgical screwdriver application results in shorter procedure times and better comfort for the surgeons. Tools with torque limiting functionality can precisely control the seating of the screw to improve patient outcomes and reduce recovery time. All of these benefits ultimately result in lower cost of care. Motorization has already become prominent in Craniomaxillofacial (CMF) procedures, and is expected to expand to medium and large bone procedures in the near future.

Portescap offers sterilizable Slotted BLDC motors that are designed to withstand the repeated autoclave cycles of reusable surgical screwdrivers. The Size 6 sterilizable motor is properly sized and geared for typical screwdriver working points, and its high efficiency allows for longer use times or a smaller battery. Customizations are available to suit specific design requirements, including integrated electronics. Portescap also offers extremely efficient but cost effective 16mm, 17mm, 22mm, and 24mm Brushed DC motors that provide high performance while maintaining low cost for single or limited use powered surgical screw drivers.

Benefits 

  • High efficiency for longer operating time and smaller battery packs

  • High speed for faster screw seating and shortened procedure time. The high speed capability also opens the door for drilling the pilot hole with the same tool

  • High torque in the smallest diameter allows for ergonomic tool profiles that can fasten even large screws requiring more power

  • Low inertia rotors can quickly change speed or stop completely to enhance torque limiting control

Customization Options 

  • Mechanical modifications to fit any tool

  • Shaft modifications including tool drivers and cannulation

  • Connector pins to replace leads or cable harnesses

  • Custom gear ratios and windings to precisely meet any working point

  • Autoclavable integrated controllers on request

  • Hall sensors or encoders for precise speed control

[value]

Specification + Detail
MetricEnglish
Model Diameter{%BR%}(in) Diameter{%BR%}(mm) Max No-Load Current{%BR%}(mA) No-Load Speed{%BR%}(rpm) Continuous Stall Torque{%BR%}(mNm) Continuous Stall Torque{%BR%}(oz-in) Continuous Stall Current{%BR%}(A) Peak Torque for 1s{%BR%}(mNm) Peak Torque for 1s{%BR%}(oz-in) Torque Constant (oz-in/A) Torque Constant (mNm/A)
Large Bone Orthopedic Saw/Reamer (9.6V) 1.24 31.5 1 130 16,928 76.2 10.80 16.50 1 432.4 202.8 0.77 5.41
Large Bone Orthopedic Saw/Reamer (12V) 1.24 31.5 1 060 15,887 82.1 11.60 13.30 1 562.6 221.3 1.02 7.20
Large Bone Orthopedic Saw/Reamer (14.4V) 1.24 31.5 850 15,245 88.0 12.50 11.40 1 720.1 243.6 1.28 9.01
Large Bone Orthopedic Drill (9.6V) 1.24 31.5 1 130 16,928 76.2 10.80 16.50 1 432.4 202.8 0.77 5.41
Large Bone Orthopedic Drill (12V) 1.24 31.5 1 060 15,887 82.1 11.60 11.40 1 720.1 243.6 1.02 7.20
Large Bone Orthopedic Drill (14.4V) 1.24 31.5 850 15,245 88.0 12.50 11.40 1 720.1 243.6 1.28 9.01

[value]

Specification + Detail
MetricEnglish
Model Diameter{%BR%}(in) Diameter{%BR%}(mm) No-Load Speed{%BR%}(rpm) No-Load Current{%BR%}(mA) Output Power{%BR%}(W) Stall Torque{%BR%}(oz-in) Stall Torque{%BR%}(mNm) Torque up to{%BR%}(oz-in) Torque up to{%BR%}(mNm) Torque Constant (oz-in/A) Torque Constant (mNm/A)
16DCP Athlonix - Graphite 0.63 16 8,684 13.2 1.1 0.45 3.16 0.31 2.18 3.00 21.2
16N78 Athlonix 0.63 16 9,475 60.0 4.7 1.63 11.50 0.85 6.00 0.21 1.5
17DCT Athlonix - Graphite 0.67 17 9,653 9.6 4.5 2.29 16.16 0.81 5.75 4.94 34.9
22DCP Athlonix - Graphite 0.87 22 10,889 11.0 4.3 2.41 17.00 0.81 5.69 5.81 41.0
22DCT Athlonix - Graphite 0.86 22 8,490 67.1 8.4 9.20 64.80 1.60 11.50 0.90 6.7
22DCT Athlonix - Precious metal 0.86 22 8,131 15.7 9.4 11.30 79.60 1.90 13.30 2.00 14.1
24DCT Athlonix - Graphite 0.94 24 7,602 8.0 8.4 8.72 61.60 1.92 13.53 8.48 59.9

[value]

Specification + Detail
MetricEnglish
Model Diameter{%BR%}(mm) Diameter{%BR%}(in) Max Efficiency{%BR%}(%) Nominal Torque{%BR%}(mNm) Nominal Torque{%BR%}(oz-in) Max. Recommended Input Speed{%BR%}(rpm)
B16 16.0 0.63 48 120.0 17.0 8,000
R16 16.0 0.63 65 300.0 42.0 7,500
M22 22.0 0.87 60 1,500.0 212.0 7,500
R22 22.0 0.87 50 600.0 85.0 5,000