Surgical drill and method of controlling the automatic stop thereof

Abstract

A surgical drill includes a drill bit, a driving device connected and electrically coupled to the drill bit, and a smart module electrically coupled to the driving device. In a bone drilling work, the smart module monitors an electrical signal of the driving device, and if the electrical signal shows a step drop, the smart module will send a stop command to the driving device to stop the operation of the driving device.

What is claimed is: 
     
         1 . A surgical drill comprising: a drill bit, a driving device coupled to the drill bit, and a smart module electrically coupled to the driving device, wherein when the surgical drill performs a bone drilling work, the smart module receives an instantaneous electrical signal from the driving device, and compares the instantaneous electrical signal with a reference electrical signal, and if the instantaneous electrical signal has a step drop with respect to the reference electrical signal, the smart module sends a stop command to the driving device to stop operation of the driving device. 
     
     
         2 . The surgical drill according to  claim 1 , wherein the instantaneous electrical signal is represented by a voltage. 
     
     
         3 . The surgical drill according to  claim 1 , wherein the reference electrical signal is a preset electrical signal of the smart module. 
     
     
         4 . The surgical drill according to  claim 1 , wherein the reference electrical signal is a sampling electrical signal. 
     
     
         5 . The surgical drill according to  claim 4 , wherein the sampling electrical signal is an average of all instantaneous electrical signals in a unit time during the bone drilling work. 
     
     
         6 . The surgical drill according to  claim 5 , wherein the unit time is a plurality of consecutive seconds, or a fixed time. 
     
     
         7 . The surgical drill according to  claim 5 , wherein the unit time includes a plurality of consecutive seconds, and the unit time rolls with working time of the surgical drill. 
     
     
         8 . The surgical drill according to  claim 5 , wherein the instantaneous electrical signal is compared with the reference electrical signal that is happened closest to the unit time. 
     
     
         9 . The surgical drill according to  claim 1 , further comprising a measuring device for obtaining a bone drilling depth, wherein the measuring device is a non-contact distance measuring device electrically coupled to the smart module. 
     
     
         10 . The surgical drill according to  claim 9 , wherein the measuring device is selected from the group consisting of a lightwave distance measuring module, an infrared distance measuring module, and a laser distance measuring module. 
     
     
         11 . The surgical drill according to  claim 10 , wherein the bone drilling depth obtained by the measuring device is displayed on a display screen of the measuring device. 
     
     
         12 . A method of controlling automatic stop of a surgical drill, executed by a smart module electrically coupled to a driving device of the surgical drill, the method comprising the steps of:
 receiving a plurality of instantaneous electrical signals of the driving device per second when the surgical drill executes a bone drilling work;   setting a plurality of consecutive seconds as a unit time, and setting an average of all instantaneous electrical signals in the unit time as a reference electrical signal;   comparing the instantaneous electrical signal with the reference electrical signal; and   when the instantaneous electrical signal has a step drop with respect to the reference electrical signal, sending a stop command to the driving device to stop operation of the driving device.   
     
     
         13 . The method according to  claim 12 , wherein the unit time is a fixed time. 
     
     
         14 . The method according to  claim 12 , wherein the unit time rolls with working time of the surgical drill. 
     
     
         15 . The method according to  claim 12 , wherein the instantaneous electrical signal is compared with reference electrical signal that is happened closest to the unit time. 
     
     
         16 . A method of controlling automatic stop of a surgical drill and measuring a bone drilling depth, executed by a smart module electrically coupled to a driving device of the surgical drill and a non-contact distance measuring device electrically coupled to the smart module, the method comprising the steps of:
 receiving a plurality of instantaneous electrical signals of the driving device per second when the surgical drill executes a bone drilling work;   setting a plurality of consecutive seconds as a unit time, and setting an average of all instantaneous electrical signals in the unit time as a reference electrical signal;   comparing the instantaneous electrical signal with the reference electrical signal;   sending a stop command to the driving device to stop operation of the driving device, when the instantaneous electrical signal has a step drop with respect to the reference electrical signal;   when the surgical drill is started, the smart module sending a first distance measuring command to the non-contact distance measuring device to obtain a first distance (D1) from a light source emitting point to an outer side of a cortical layer and send the first distance to the smart module;   when the stop command is sent to stop operation of the driving device, the smart module sending a second distance measuring command to the non-contact distance measuring device to obtain a second distance (D2) from a light source emitting point to an outer side of the cortical layer and send the second distance (D2) to the smart module; and   executing the operation of [D1−D2] by the smart module to obtain a bone drilling depth value, and displaying the bone drilling depth value on a display screen of the bone drilling depth measuring device.