at the outset , it should be clearly understood that like reference numerals are intended to identify the same structural elements , portions or surfaces consistently throughout the several drawing figures , as such elements , portions or surfaces may be further described or explained by the entire written specification , of which this detailed description is an integral part . unless otherwise indicated , the drawings are intended to be read ( e . g ., cross - hatching , arrangement of parts , proportion , degree , etc .) together with the specification , and are to be considered a portion of the entire written description of this invention . as used in the following description , the terms “ horizontal ”, “ vertical ”, “ left ”, “ right ”, “ up ” and “ down ”, as well as adjectival and adverbial derivatives thereof ( e . g ., “ horizontally ”, “ rightwardly ”, “ upwardly ”, etc . ), simply refer to the orientation of the illustrated structure as the particular drawing figure faces the reader . similarly , the terms “ inwardly ” and “ outwardly ” generally refer to the orientation of a surface relative to its axis of elongation , or axis of rotation , as appropriate . referring now to the drawings , fig1 is an embodiment of a filtration system and device for use in a hospital or medical facility with a central vacuum system . in this embodiment , the filtration system / device is mounted in or associated with an or boom or wall 1 . it may also be mounted or incorporated in a suite or cart known to those skilled in the art . a central vacuum source 2 is provided which is connected through a connector 3 to a filter receiver 5 and filter 6 ( collectively , a filter basket ). the filter basket permits insertion and removal of filters and replacement filters as desired . this embodiment also includes a valve 4 such as a solenoid valve for controlling air flow to / from the surgical site . the filter basket ( filter 6 and filter receiver 5 ) is connected through tubing 9 to the surgical site . a control panel 7 is also provided , said control panel being electrically connected to the filtration device through an electrical connection 8 . the filter basket 5 , 6 in this embodiment is positioned near the surgical site such that smoke , blood and contaminants are filtered near the surgical site to eliminate or minimize the smoke , blood and contaminants which are transmitted to the central vacuum system 2 and associated piping and tubing . the filtration system and device may be configured and arranged to connect an electrosurgical generator , laser or plasma knife ( not shown ) into an outlet near the device to sense activation of a plume - producing surgical instrument in a manner described below or known to those skilled in the art ( e . g . sensing of power consumption on the electrical power line , or sensing rf energy generated during activation ). fig2 discloses embodiment 100 of a device for remotely controlling a medical vacuum source . embodiment 100 comprises housing 102 , outlet port 104 , and inlet port 106 . housing 102 is made of metal . the metal surface is nonporous and thus easily disinfectable . other materials such as plastic may be used to construct housing 102 . outlet port 104 contains an adapter for creating an airtight connection to standard vacuum tubing 103 and connecting to vacuum source 108 . outlet port 104 &# 39 ; s adapter forms an air - tight seal through compressively engaging with tubing 103 . similarly , inlet port 106 contains an adapter for creating an air - tight seal with standard tubing for connecting to medical suction apparatus 110 . a luer - lock or other style adapter may alternatively be used for the inlet and outlet port adapters . embodiment 100 contains activatable valve 112 arranged within housing 102 . a first end of valve 112 connects to outlet port 104 through tube 120 . valve 112 is connected to controller 116 through control line 141 , which controls the extent valve 112 is open . activatable valve 112 is a solenoid valve such as ingersoll - rand solenoid valve model # cat66p - 120 - a . other activatable valves may be used . the second end of valve 112 connects to filter 114 through tube 122 . filter 114 is a multilayer filter , containing layer 115 for odor absorption and layer 117 for particle absorption . odor absorption layer 115 contains activated charcoal and the particle absorption layer 117 is a ulpa filter . filter 114 contains rfid tag 118 . rfid tag 118 is a passive rfid tag containing embedded information indicating the filter type and lifetime . rfid transceiver 119 is arranged within the housing and oriented to read rfid tag 118 . rfid transceiver 119 is a melexis part # mlx90109 rfid transceiver , however , other rfid transceivers may be used . controller 116 is an alterra stratix fpga ; however , other fpga &# 39 ; s , microcontrollers , cpus , or logic devices may be used . controller 116 contains embedded software which controls the operation of controller 116 . controller 116 receives input from line 123 which is connected to output 125 of receiver 124 . controller 116 contains an internal timer . receiver 124 is a current sensor having output 125 and input 126 . receiver 124 has terminals 126 and 127 . terminal 127 is connected to external power supply 130 through wall socket plug 129 and terminal 126 is connected to power line 132 . the voltage on output 125 is a function of the magnitude of the current passing through terminals 126 and 127 . receiver 124 is an isolated hall - effect sensor such as those offered by allegro microsystems , inc . alternative current sensors , such as a simple resistor voltage divider , may also be used . an analog to digital converter may need to be placed between receiver 125 and controller 116 depending upon the type of receiver and controller used . receivers based on technology other than current sensors may also be used as will be described in the following embodiments . power line 132 connects to line 133 , which passes out inlet port 106 and travels within tubing 105 to medical apparatus 110 . line 132 and 133 contain multiple wires including at least a ground wire and a power wire . in the following example , medical apparatus 110 is an electrosurgical device . medical apparatus 110 contains activation button 111 for turning on the electrosurgical device . the operation of first embodiment 100 begins with properly connecting the embodiment to power supply 130 , vacuum source 108 , and medical apparatus 110 . wall socket plug 129 should be inserted into standard electrical wall outlet . tubing 103 should be connected to outlet port 104 &# 39 ; s adapter and vacuum source 108 , ensuring that an air - tight seals are created . tubing 105 similarly should be connected to inlet port 106 &# 39 ; s adapter and the suction port on medical apparatus 110 . also , line 133 should be connected to the power line 132 and medical apparatus 110 . after all the proper connections are made , the medical apparatus should be off ( activation button 111 should not be depressed ). since the medical apparatus is not on , there will be no current flow through lines 129 and 132 . the lack of current flow will be sensed by current sensor / receiver 124 and indicated on output 125 . controller 116 will read output 125 and determine that the medical apparatus is not on . controller 116 will then send a command signal along control line 141 . activatable valve 112 receives the control signal along line 141 and shuts the valve closed . with valve 112 closed , fluid flow is prevented along the path from medical apparatus 110 , into inlet port 106 , through filter 114 , through valve 112 , out outlet port 104 , and to vacuum source 108 . when a user of medical apparatus 110 depresses activation button 111 , medical apparatus begins to draw current along line 133 and thus along lines 132 and 129 . current sensor / receiver 125 senses the increase in current flow through terminals 124 and 126 , and thus changes output 125 . controller 116 senses the change in signal on line 123 and in response changes the command signal on command line 141 from a closed signal to an open signal . valve 112 , in response to the open signal opens . fluid is now allowed to flow from medical suction apparatus 110 , and into inlet port 106 . impurities such as smoke particles and odors in the fluid coming in inlet port 106 are removed by filter 114 . fluid flow continues through valve 112 , out outlet port 104 and into vacuum source 108 . fig3 discloses an embodiment 200 which contains multiple receivers , 251 , 252 , 253 , 254 , and 255 , designed to work with various surgical device types 271 , 272 , 273 , 274 , and 275 . the multiple receivers allow for remote control to be accomplished in several different ways . receiver 251 is an adapter giving a direct electrical connection to manual switch 260 or surgical device 271 . for example , manual switch 260 may be a foot pedal switch . similarly , surgical device 271 may include manual switch buttons . manual switch 260 and the manual button in surgical device 271 will electrically connect control wires 262 and 263 . this electrical connection notifies the control box when the activation button on surgical device 271 or manual switch 260 are depressed and controls solenoid valve 212 accordingly . alternatively , the manual switch or surgical device buttons may be analog switches which control an analog voltage level on line 263 . in another form , the manual switch or surgical device buttons may provide a serial digital signal indicating their state on line 262 . receiver 252 is an audio receiver such as a microphone . surgical device 272 emits a fixed frequency tone when in use . control box 216 contains a microprocessor for analyzing the microphone signal from receiver 252 . whether surgical device 272 is on is determined by analyzing the microphone signal . more specifically , a fast fourier transform is performed on the microphone signal . if the power within the frequency range containing the tone frequency emitted by surgical device is above a threshold , surgical device 272 is determined to be on and valve 212 is controlled accordingly . the threshold may be adjusted to minimize false activations . additionally , dsp processors and advanced algorithms such as fir and iir filters may be used within the control box to more accurately trigger off of surgical device 272 . receiver 253 is a current sensor connected to surgical device 273 &# 39 ; s power supply 261 . receiver 253 contains an output indicating the magnitude of the current drawn by surgical device 273 . control box 216 &# 39 ; s microprocessor compares the current level from current sensor ( receiver ) 253 and if determines if surgical device 273 is on based on whether the current sensor output exceeds a threshold . multiple thresholds are used to detect multiple activation schemes of surgical device 273 and to adjust valve 212 accordingly . for example , surgical device 273 may be an electrosurgical device having a cut mode and a coagulate mode , each drawing different levels of current . a threshold may be created for each mode , and valve 112 assigned a separate flow rate for each mode . receiver 254 is a current sensor which operates without direct contact . such current sensing is achieved using a hall - effect sensor or a sensor containing an electrical loop around the surgical device power line . similar to the operation of receiver 253 , depending upon the magnitude of the output from current sensor 254 , control box 216 will appropriately adjust valve 212 . receiver 255 is an rf sensor configured to measure an am signal in the frequency range of 350 khz to 1 . 25 mhz . rf sensor 255 may be coupled to an antenna . receiver 255 is configured to detect the rf given off by surgical device 275 when in operation . for example , an electrosurgical device typically gives off amplitude modulated radio signals in the range of 350 khz to 1 . 25 mhz . control box 216 can perform signal analysis on receiver 255 &# 39 ; s output similar to the analysis performed on audio receiver 252 &# 39 ; s output . rf mixers may be used to convert the rf signal to a lower ( baseband ) frequency range which can be more easily analyzed by the microprocessor within control box 216 . the embodiment in fig4 includes a flow splitter 349 and fluid canister 350 . flow splitter 349 is configured to separate any liquid entering inlet 306 into liquid path 380 . the alternate path for gas should be free of any liquid . flow splitter 349 may be part of filter 314 . fluid canister 350 may optionally be connected to liquid outlet port 385 which connects to an external liquid drain . in other embodiments , a delay may be added to before switching the activatable valve open or closed from when the surgical device turns on and off . additionally , a biohazard sensor may be added to any of the embodiments and may connect to an alarm . the filter may be designed to remove moisture . additionally , an occlusion sensor may be added in the flow path and configured to cause the controller to shut the valve if an occlusion is detected . for example , if the suction device were to come into direct contact with flesh . swivels may be added to the tubes . the device may be made of disposable or recyclable components . additionally , the device may contain its own vacuum unit . in fig5 , a remote control unit for use with a filtration device is shown . this embodiment provides a remote control unit in an accessory format that can be used to remotely switch on and off any device through a controlled output wire . as shown in fig5 , a smoke evacuator unit is the controlled device , receiving the output wire from the remote control unit . this embodiment contains an rf sensor which is optimized for sensing the rf given off by an electrosurgical unit ( electrosurgical pen ). a user interfaces with the remote control unit in order to set a variety of operating parameters . fig6 shows the major circuit elements of the remote control unit , including an rf antenna , an amplification transistor , a user button , a microcontroller , and the control output line . the rf antenna is embedded into a printed circuit board . the transistor is properly biased with a voltage divider such that an rf signal sensed by the antenna is amplied at the microcontroller input pin . software is provided on the microcontroller which samples the amplified rf input from the transistor and sets the control output voltage as a function of the input signals and several configuration parameters . fig7 is a top level software block diagram of the software running on the microcontroller . several interrupt driven program subroutines are used . one subroutine periodically samples the rf input and another subroutine determines the user button state . in one aspect , a device can be triggered off of the radio signals emitted by a surgical device . such triggering allows the remote control device to be electrically isolated ( no direct wire contact ) from the surgical device . such a configuration is advantageous to ensure that the electrical system of the surgical device is not compromised by external systems , thus increasing safety . also , a remote activation device is provided which can be remotely triggered off of a variety of signal types . for example , when the surgical device the embodiment is used with provides a direct electrical connection for triggering the remote device , an adapter for receiving such signal directly is provided . alternatively , if the surgical device emits an audio signal during use , this audio signal can be used to trigger the remote device . in other scenarios , the radio frequency radiation emitted by a surgical device can be used as a trigger . therefore , while the presently - preferred form of the filtration device and system have been shown and described , and several modifications discussed , persons skilled in this art will readily appreciate that various additional changes may be made without departing from the scope of the invention disclosed herein .