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Lumbar puncture Safety tool

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Lumbar puncture Safety tool

  1. 1. LUMBAR PUNCTURE SAFETY TOOL RS02-Dr Ravi Selvaganapathy By Daniel Ebere Long Yao PUNCHEON RESEARCH
  2. 2. LUMBAR PUNCTURE
  3. 3. Introduction ● Lumbar puncture (LP) is a procedure that extracts cerebrospinal fluid (CSF) from the subarachnoid space from the spinal space in the lumbar region of the lower back. ● The current problem is to control the insertion depth to protect injury due to over penetration. ● This project is improves the manual control to automatic control in the depth of insertion which will decrease the possibility of injury in lumbar puncture.
  4. 4. Original Objectives ● Control the distance of insertion and the force applied on the lumbar puncture needle. ● Automatic stop of the insertion to protect the nerve system. ● Move back mechanism to avoid over penetration due to the bounce of the dura mater. ● Minimize the weight of the lumbar puncture needle to better handle.
  5. 5. Objectives Achieved ● Emergency button to move the needle backwards ● Control the distance of insertion and the force applied on the lumbar puncture needle. ● Automatic stop of the insertion to protect the nerve system. ● Move back mechanism to avoid over penetration due to the bounce of the dura mater. ● Minimize the weight of the lumbar puncture needle to better handle.
  6. 6. Design criteria Requirement Value Unit No. Of DOF 1 - Force range 0-20 N Response time 51 ms Speed 0-10 mm/s Overshoot distance 0-8 [3] mm
  7. 7. Design details ● Coaxial needle design made up of an inner and outer needle. ● The inner needle experiences the cutting force ● The outer needle experiences the shear force from surrounding tissues
  8. 8. Ft = Cutting force Fa = Actuator force Fs= Shear force from surrounding tissues Fh= Handling force
  9. 9. Procedure Points ● The cutting force should change as the inner needle goes through several tissues. ● Force sensor at the end of the hub of the cutting needle reads the force changes ● Outer needle takes the shear force ● Force drops as the CSF area is reached ● Brake is activated. ● Tube is connected to the hub of the outer needle to collect the CSF fluid when it
  10. 10. SIGNAL FLOW DIAGRAM
  11. 11. Testing
  12. 12. Summary of testing Test Number of test made Motor Test 5 Force sensor Test 4 Force drop Test 4 Final assembly test 6
  13. 13. Step Motor Test Result ● The stepper motor is tested on its performance on acceleration , velocity and angular velocity. ● The relationship between actual velocity and angular velocity which is y = 0.314*x + 0.1163, where y is the angular velocity in rad/s and x is the actual velocity input in steps/s.
  14. 14. Force Sensor Test Result ● The benefits of the dead band compensation are that it can reduce the settling time and lower the steady state error. ● The calibration equation is y = 0.1943*x, where x is the sensor output and y is the value in N.
  15. 15. Final Assembly Test Result (Styrofoam) ● The insertion automatically stops when it penetrates the styrofoam plate. The overshoot distances are different for each sample. Sample A Sample B Sample C
  16. 16. Final Assembly Test Result ● The overshoot distance should be with 8 mm. so sample A and sample C are accepted as successful insertion. So the successful rate is 75% in the 6 tests. ● The setting of the deadweight in the programing code is too large that decrease the sensitivity of the force sensor. Overshoot distance of each sample
  17. 17. Societal and Economic Impacts Social Economic ● —USA-400,000 lumbar punctures per year ● —1/1000 injured every year ● —Reduced to 1/300,000 ● —Health-adjusted life expectancy ● —Reduces public spending on health care ● —Increases disposal income of patients
  18. 18. Questions ? Thank you for Listening

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