Time-based wireless pairing between a medical device and a wall unit
A time-based wireless pairing operation between a medical device, such as a patient bed, and a wall module in a patient room is initiated in response to a power plug of the medical device being plugged into a power receptacle carried by the wall module. Times determined by timers of the medical device and the wall module are compared by the wall module or by the medical device so that wireless pairing occurs only with the medical device that was plugged into the wall module. Different types of plug detectors used in the wall module to detect connection of the power plug include optical detectors, mechanical switches, and current sensors.
1 . A system for use in a healthcare facility comprising a network and a nurse call system, the system comprising
a medical device having a first wireless transceiver, a first timer, and a power cord terminating at a power plug, the medical device having a first sensor to determine that the medical device is receiving power via the power plug and power cord, and
a wall unit mounted at a fixed location in a patient room of the healthcare facility, the wall unit having a second wireless transceiver and a second timer, the wall unit receiving AC power from the healthcare facility, the wall unit carrying an AC outlet into which the power plug of the medical device is coupleable, the wall unit having an AC plug sensor that senses the power plug being plugged into the AC outlet, wherein the first timer is started to measure a first uptime in response to the first sensor sensing that the medical device is receiving power via the power plug and the power cord, wherein the second timer is started to measure a second uptime in response to the power plug being sensed by the AC plug sensor of the wall unit, wherein the medical device is configured to transmit to the wall unit from the first wireless transceiver an advertisement including the first uptime, wherein the wall unit compares the first uptime with the second uptime and, if the first uptime is within a predetermined tolerance range of the second uptime, the wall unit sends a pairing message to the medical device which results in the wall unit and medical device becoming automatically paired for subsequent wireless communications.
2 . The system of claim 1 , further comprising a nurse call cord extending from the wall unit, the nurse call cord terminating at a first nurse call connector configured for connection to a nurse call port of the nurse call system.
3 . The system of claim 2 , wherein the nurse call cord includes an auxiliary cord branch terminating at a second nurse call connector, the second nurse call connector being coupleable to a third nurse call connector at an end of a device nurse call cord extending from the medical device.
4 . The system of claim 2 , wherein the first nurse call connector is provided in a connector body of the nurse call cord, the connector body having a second nurse call connector that is configured to couple to a third nurse call connector at an end of a device nurse call cord extending from the medical device.
5 . The system of claim 1 , wherein the wall unit includes a first nurse call connector configured to couple to a second nurse call connector at an end of a device nurse call cord extending from the medical device.
6 . The system of claim 1 , wherein the medical device further comprises a first wireless fidelity (WiFi) transceiver configured to send WiFi messages to, and receive WiFi messages from, at least one wireless access point of the network.
7 . The system of claim 6 , wherein the first wireless transceiver comprises a first Bluetooth transceiver mounted to a first circuit board of the medical device and the first WiFi transceiver is mounted to a second circuit board of the medical device.
8 . The system of claim 7 , wherein the second wireless transceiver comprises a second Bluetooth transceiver and further comprising a first set of switches on the first circuit board to provide first contact closures indicative of a plurality of states of the medical device and a second set of switches in the wall unit, wherein the second set of switches have second contact closures that are controlled by a controller of the wall unit to match the plurality of states of the first contact closures based on data contained in Bluetooth messages received by the second Bluetooth transceiver from the first Bluetooth transceiver.
9 . The system of claim 8 , wherein at least one of the second contact closures changes state to control at least one of the following: a television in the patient room or a light in the patient room.
10 . The system of claim 8 , wherein the medical device comprises a patient bed and at least one of the second contact closures changes state to indicate at least one of the following: an alarm state of a bed exit system of the patient bed; a siderail of the patient bed has been moved to a lowered position; brakes of casters of the patient bed are in a released condition; an upper frame of the patient bed has been raised out of its lowest position; or a nurse call button of the patient bed has been pressed.
11 . The system of claim 6 , wherein the wall unit includes a second WiFi transceiver configured to send WiFi messages to, and receive WiFi messages from, the at least one wireless access point of the network.
12 . The system of claim 1 , wherein the medical device includes a speaker and a microphone and the first and second wireless transceivers are configured for transmission and receipt of audio messages after the medical device and the wall unit are paired.
13 . The system of claim 1 , wherein the wall unit includes a light that is illuminated to indicate a pairing state between the medical device and the wall unit.
14 . The system of claim 1 , wherein the wall unit determines whether to initiate unpairing from the medical device based on device data received by the second wireless transceiver from the first wireless transceiver of the medical device.
15 . The system of claim 14 , wherein the medical device includes a frame and casters coupled to the frame and wherein the wall unit initiates unpairing based on the device data indicating that brakes of the casters are released.
16 . The system of claim 14 , wherein the wall unit initiates unpairing based on the device data indicating that the power plug of the medical device has been unplugged.
17 . The system of claim 1 , wherein the wall unit determines whether to initiate unpairing from the medical device in response to the AC plug sensor sensing that the power plug has been unplugged from the AC outlet.
18 . The system of claim 1 , wherein the AC plug sensor of the wall unit comprises a photo emitter and a photo detector that cooperate to detect presence of a plug body of the power plug or presence of at least one prong of the power plug of the medical device being inserted into the AC outlet of the wall unit.
19 . The system of claim 18 , wherein the photo emitter emits infrared (IR) light in a generally horizontal direction for detection by the photo detector and wherein the plug body or the at least one prong blocks the IR light from reaching the photo detector after the power plug is plugged into the AC outlet.
20 . The system of claim 18 , wherein the photo emitter emits infrared (IR) light in a generally vertical direction for detection by the photo detector and wherein the plug body or the at least one prong blocks the IR light from reaching the photo detector after the power plug is plugged into the AC outlet.
21 . The system of claim 1 , wherein the AC plug sensor comprises a mechanical switch that moves from a first state to a second state in response to the power plug of the medical device being plugged into the AC outlet of the wall unit.
22 . The system of claim 21 , wherein the mechanical switch comprises a plunger switch having a plunger that is pressed inwardly by a plug body of the power plug when the power plug is plugged into the AC outlet of the wall unit.
23 . The system of claim 1 , wherein the AC plug sensor comprises a current sensor to sense current flowing to at least one prong of the power plug after the power plug is plugged into the AC outlet of the wall unit.
24 . The system of claim 1 , wherein the medical device is configured to transmit a device identification (ID) to the wall unit and the wall unit is configured to transmit the device ID and a location ID to at least one server of the network of the healthcare facility, the location ID being correlatable to a location at which the medical device is located in the healthcare facility.
25 . The system of claim 24 , wherein the medical device includes a graphical display screen and the wall unit is configured to transmit from the second wireless transceiver to the first wireless transceiver of the medical device a smart text string that is displayed on the graphical display screen, the smart text string including a name of the location at which the medical device is located and being different than the location ID.
26 . The system of claim 25 , wherein the medical device does not receive the location ID from the wall unit and does not retransmit the smart text string.
27 . The system of claim 1 , further comprising a mobile phone having a third wireless transceiver, a second sensor, and a first hardwire port, and a speaker unit having a fourth wireless transceiver, a third sensor, and a second hardwire port, the second sensor being operable to sense that the mobile phone has a hardwire connected to the first hardwire port, the third sensor being operable to sense that the speaker unit has the hardwire connected to the second hardwire port, wherein in response to the hardwire connected to the first and second hardwire ports, respectively, the mobile phone and the speaker unit implement a time-based Bluetooth pairing operation in which a first connection time determined by the mobile phone is compared to a second connection time determined by the speaker unit.
28 . The system of claim 1 , wherein the medical device includes an ambient light sensor, the wall unit includes at least one illuminable indicator, and a brightness of the at least one illuminable indicator of the wall unit is controlled based on information that is transmitted wirelessly from the medical device to the wall unit and that pertains to ambient light detected by the ambient light sensor.
29 . The system of claim 1 , wherein the wall unit includes a first frequency modulation (FM) transceiver, wherein the medical device includes a second FM transceiver, and wherein audio signals are communicated between the wall unit and the medical device using the first and second FM transceivers.
30 . The system of claim 1 , wherein the wall unit includes a correlator to compare a first audio signal received via a wired connection and a second audio signal received wirelessly to determine a correlation parameter, wherein if the correlation parameter has a value that violates a threshold condition, then the wall unit operates to mute a speaker of the medical device.