Patent Application
20170357241
Embodiments of the present invention relate to devices, systems, and methods configured to reduce traumatic brain injuries in football players and other athletes and users.
Closed-head traumatic brain injury (TBI) is typically a result of the brain impacting the interior of the skull. Forces acting on the body or the head generally accelerate the brain. High positive acceleration or negative acceleration may cause the brain to contact the skull with enough force to cause damage. The types of damage may be categorized as concussive TBI, blast TBI, or mild TBI. Concussive TBI may be suffered by athletes in sports such as hockey, boxing, or American football. Blast TBI may be experienced by military or law enforcement personnel while on patrol or traveling in a vehicle. Mild TBI may be experienced by anyone suffering a fall, a minor vehicular accident, or the like. Furthermore, the direction and location of the impact and the resulting motion of the head may determine the severity of the injury. Studies have shown that a side impact to the head, or the body, that results in the head rotating (about the roll axis) to the left or right shoulder may lead to a greater chance of suffering a TBI, as compared with impacts from other directions.
Helmets are available to athletes, military personnel, law enforcement personnel, and the like. While helmets generally provide protection for skull fractures upon direct impact, they do not provide protection from rotational forces to the head and may not reduce the occurrence or severity of a concussive TBI (cTBI). Even when wearing a helmet, the head, and the brain within, may experience an acceleration of a great enough magnitude to cause a cTBI.
Implementing a rigid linkage between the helmet and the body of the helmeted person has been proposed in prior art as a means to reduce concussive traumatic injuries. In concussions, however, impact energy can act on the head within 20-50 milliseconds of impact.
Embodiments of the present invention solve the above-mentioned problems and provide methods, devices, and systems that are utilized with head gear and body wear to reduce traumatic brain injuries. One aspect of the present invention attempts to reduce traumatic brain injuries of athletes and others by anticipating when the athletes are about to collide with other persons or objects and then triggering protective gear worn by the athletes to protect them from the anticipated impact.
A method of reducing traumatic brain injuries in accordance with an embodiment of the invention comprises the steps of: determining locations of a user as the user moves; determining if the user is likely to impact another person or object based on the locations of the user and the other person or object; and transmitting a locking signal to a head-stabilizing component worn by the user when it is determined the user is likely to impact another person or object so as inhibit motion of the user's head relative to the user's torso. The method may further comprise the steps of determining an approximate force at which the user is likely to impact the other person or the object based on the locations, velocities, and accelerations of the user and transmitting the locking signal to the head-stabilizing component only if the approximate force at which the user is likely to impact the other person or object is likely to cause injury.
A system for reducing traumatic brain injuries of athletes on a sports field constructed in accordance with another embodiment of the invention includes a plurality of transmitters configured to be worn by at least some of the athletes; a plurality of sensors configured for placement on or near the sports field for receiving signals from the transmitters as the athletes move on the sports field; a head-stabilizing component worn by at least one of the athletes; and a processing element coupled with the sensors and in communication with the head-stabilizing component. The processing element determines locations of the athletes on the sports field based on the signals transmitted from the transmitters worn by the athletes; determines if the athletes are likely to impact one another or other objects based on the locations of the athletes; and transmits an activating signal to the head-stabilizing component if the athlete is likely to impact another athlete to inhibit motion of the athlete's head. The processing element may be further programmed to determine a force at which the athletes are likely to impact based on the signals transmitted from the transmitters and to transmit the activating signal to the head-stabilizing component only if the force is likely to cause injury. In one embodiment, the head-stabilizing component includes a head component configured to be worn on the athlete's head, a body component configured to be worn on the athlete's body, and a linkage element that connects the head component and the body component. The activating signal from the processing element switches the linkage element to a more rigid state to reduce relative movement between the athlete's head and torso.
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Other aspects and advantages of the current invention will be apparent from the following detailed description of the embodiments and the accompanying drawing figures.
Embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:
The drawing figures do not limit the current invention to the specific embodiments disclosed and described herein. The drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the invention.
The following detailed description of the invention references the accompanying drawings that illustrate specific embodiments in which the invention can be practiced. The embodiments are intended to describe aspects of the invention in sufficient detail to enable those skilled in the art to practice the invention. Other embodiments can be utilized and changes can be made without departing from the scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense. The scope of the present invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled.
In this description, references to “one embodiment”, “an embodiment”, or “embodiments” mean that the feature or features being referred to are included in at least one embodiment of the technology. Separate references to “one embodiment”, “an embodiment”, or “embodiments” in this description do not necessarily refer to the same embodiment and are also not mutually exclusive unless so stated and/or except as will be readily apparent to those skilled in the art from the description. For example, a feature, structure, act, etc. described in one embodiment may also be included in other embodiments, but is not necessarily included. Thus, the current technology can include a variety of combinations and/or integrations of the embodiments described herein.
Certain aspects of the inventions described in the present application are described in U.S. patent application Ser. No. 14/554,141, titled “DEVICE AND SYSTEM TO REDUCE TRAUMATIC BRAIN INJURY”, filed Nov. 26, 2014. The earlier-filed patent application is hereby incorporated by reference, in its entirety, into the current patent application. Aspects of the inventions described in the present application are also described in U.S. patent application Ser. No. 14/959,083, titled “DEVICE TO REDUCE TRAUMATIC BRAIN INJURY”, filed Dec. 4, 2015. This earlier-filed patent application is also hereby incorporated by reference, in its entirety, into the current patent application.
A device 10 for reducing traumatic brain injury constructed in accordance with a first embodiment of the current invention is shown in
The first sensor 12, as seen in
The sensor measurements be an analog value, a digital value, a pulse-width modulation (PWM) value, or the like. The first sensor 12 may output the sensor measurements at a frequency ranging from 500 hertz (Hz) to 20 kilohertz (kHz) or higher. This range of frequencies should be great enough to detect an impulse-like impact, whose duration may be range from a fraction of a millisecond to single digits of milliseconds. The first sensor 12 may also include electronic circuitry such as amplifiers, analog-to-digital converters (ADCs), or other conversion circuits.
The first sensor 12 may be positioned within the interior of the head component 24 of the user. The head component 24 may be headwear, headgear, a helmet, such as a sports helmet, a motorcycle or automobile helmet, or a combat helmet, or the like. In some embodiments, the first sensor may be integrated or as a part of a head band or skull cap made from wearable material and worn, either along or to be worn underneath the protective helmet. In some embodiments, the first sensor 12 may further include first and second resilient members, such as springs, that are coupled to opposing sides of the first sensor 12. The first resilient member may contact an inner surface of the head component 24, and the second resilient member may contact the user's head. In other embodiments, the first sensor 12, with or without resilient members, may be coupled to padding on the interior of the head component 24, or coupled to a hard shell of the head component 24, such that when the head component 24 is worn, the first sensor 12 may contact the user's head in order to detect force and other physical parameters related to the force applied to the head or the helmet (it may be advantageous for the first sensor 12 to also analyze the force at the helmet, which is typically of a greater magnitude than the force at the head).
The second sensor 14, as seen in
The linkage element 16, as seen in
While the linkage element 16 is in a flexible state, it may seem limp or relaxed and may assume a variety of shapes, positions, and orientations as the user moves his head with respect to his body. This allows the user to have a wide range of motion and freedom of head movement while wearing the device 10. When the linkage element 16 is in a rigid state, it may maintain the same shape it was in when it transformed from the flexible state to the rigid state. However, the linkage element 16 is in the rigid state for only a short period of time, as discussed in greater detail below.
The first anchor 26, as seen in
The first anchor 26 may be attached to the head component 24. For embodiments in which there is only one linkage element 16, the first anchor 26 may be attached at a base of the head component 24 on a rear side, roughly in the center. For embodiments in which there are three linkage elements 16, the device 10 may include a left first anchor 26A, a right first anchor 26B, and a center first anchor 26C. The left first anchor 26A may be attached to the left side of the head component 24, generally in the vicinity of the left ear. The right first anchor 26B may be attached to the right side of the head component 24, generally in the vicinity of the right ear. The center first anchor 26C may be attached to the base of the head component 24 on the rear side, roughly in the center. The attachment of the first anchor 26 to the head component 24 is usually rigid and may be accomplished with a plurality of connectors, such as snaps, a plurality of fasteners, such as screws, or the like. In some embodiments, the first anchor 26 may be integrally formed as part of the head component 24.
The second anchor 28, as seen in
The second anchor 28 may be attached to the body component 22. For embodiments in which there is only one linkage element 16, the second anchor 28 may be attached along or near the center of the body component 22. Alternatively, the second anchor 28 may connect to body equipment such as body armor, a flak jacket, or the like, when the body component 22 is not needed. For embodiments in which there are three linkage elements 16, the device 10 may include a left second anchor 28A, a right second anchor 28B, and a center second anchor 28C. The left second anchor 28A may be coupled to body equipment, generally at the left shoulder. The right second anchor 28B may be coupled to body equipment, generally at the right shoulder. The center second anchor 28C may be attached to the body component 22, typically along or near the center of the body component 22. Alternatively, the center second anchor 28C may connect to body equipment, when the body component 22 is not needed.
As with the first anchor 26, the attachment of the second anchor 28 to the body component 22 is usually rigid and may be accomplished with a plurality of connectors, such as snaps, a plurality of fasteners, such as screws, or the like. In certain embodiments, the second anchor 28 may be integrally formed as part of the body component 22. In other embodiments, the first anchor 26 and the second anchor 28 may be of the same dimension so that part of the linkage element 16 may be readily replaced or repaired with components from another part of the linkage element 16. This configuration may provide an advantage for soldiers in combat situations.
The first end link 30, as seen in
The first end link 30 may be positioned such that the first ball component 48 is retained in the anchor socket 36 of the first anchor 26. In some embodiments, the first ball component 48 and the second ball component 50 may be interchangeable, such that the second ball component 50 is retained in the anchor socket 36. As mentioned above, the first end link 30 may be able to rotate, pivot, or move in a conical fashion with respect to the first anchor 26 until the locking element 38 locks the first end link 30 in position.
The second end link 32, as seen in
The middle link 34, as seen in
In various embodiments, the end links 30, 32 may be removable from the anchors 26, 28 such that the user can easily disengage the body component 22 from the head component 24. Thus, first ball component 48 may be removable from first anchor socket 36, and first ball component 54 may be removable from second anchor socket 42.
The linkage element may alternatively be a hydraulic mechanism with a pneumatic chamber and plunger as described in the Serial No. 62/088,181 application referenced above.
The processing element 18, as seen in
The processing element 18 may receive sensor measurements from the first sensor 12 and the second sensor 14 and may determine, among other things, if the sensors 12, 14 indicate the presence of a potentially dangerous and injurious impact force. The processing element 18 may receive at least three linear acceleration measurements, at least three angular acceleration measurements, or a combination of both. In some embodiments, the processing element 18 may calculate a magnitude and direction of the acceleration or motion of the head based on the sensor measurements. The magnitude and direction calculation may include a linear acceleration as well as an angular or rotational acceleration. The processing element 18 may consider the magnitude and direction separately and may determine whether the magnitude is greater than or equal to an injury level—i.e., a level at which damage to the recipient may occur. If so, then the processing element 18 may generate or assert a locking signal that is transmitted to the one or more linking elements 16. If the magnitude is less than the injury level, then the processing element 18 may do nothing. For example, the processing element 18 may generate the locking signal if the value of the linear acceleration is greater than or equal to, say, 50 G (the acceleration due to the Earth's gravity) in any direction. The threshold may also be a dynamic threshold that varies depending upon the person being monitored and other factors. In some cases, the injury level value of the magnitude may change depending on the direction, so that the injury level may be 50 G in some directions and greater than 50 G in other directions. To continue the example, the processing element 18 may generate the locking signal if the value of the angular acceleration is greater than or equal to, say, 4000 rad/sec2 in any direction. As with the linear acceleration, the injury level magnitude may change depending on the direction.
In other embodiments, the processing element 18 may evaluate the sensor measurements individually. If the measurements include linear acceleration values such as along the X, Y, and Z axes, then the processing element 18 may generate the locking signal if the linear acceleration value along any of the axes is above the injury level. Alternatively, each axis may have its own injury level value, so that there is an X-axis injury level, a Y-axis injury level, and a Z-axis injury level. Accordingly, the processing element 18 may generate the locking signal if the linear acceleration value along the X-axis is greater than or equal to the X-axis injury level or if the linear acceleration value along the Y-axis is greater than or equal to the Y-axis injury level or if the linear acceleration value along the Z-axis is greater than or equal to the Z-axis injury level or combinations thereof. Furthermore, the processing element 18 may apply an algorithm or a set of steps to the linear acceleration values to determine whether to generate the locking signal.
If the measurements include angular acceleration values such as about the pitch, roll, and yaw axes, then the processing element 18 may generate the locking signal if the angular acceleration value about any of the axes is above the injury level. In some cases, the value of the angular acceleration about the roll axis may be considered most critical. Thus, the processing element 18 may generate the locking signal if the angular acceleration value is greater than or equal to the injury level even if the other values are less than the injury level. As with the linear acceleration values, each axis may have its own injury level value, so that there is a pitch-axis injury level, a roll-axis injury level, and a yaw-axis injury level. The values may also be different for different people (e.g. higher for adults than children). Accordingly, the processing element 18 may generate the locking signal if the linear acceleration value about the pitch-axis is greater than or equal to the pitch-axis injury level or if the linear acceleration value about the roll-axis is greater than or equal to the roll-axis injury level or if the linear acceleration value about the yaw-axis is greater than or equal to the yaw-axis injury level or combinations thereof. Furthermore, the processing element 18 may apply an algorithm or a set of steps to the angular acceleration values to determine whether to generate the locking signal.
The locking signal generated by the processing element 18 may include a binary data value, a binary logic level, a pulse-width modulated signal, a voltage value, a current value, or the like. Furthermore, the processing element 18 may include or have access to timer or clock circuitry, which may be utilized in order for the processing element 18 to generate the locking signal for a predetermined time period. In various embodiments, the period for the locking signal may range from approximately 100 milliseconds (ms) to approximately 300 ms (although the most critical period for the locking action is close to 100 milliseconds).
The memory element 20, as seen in
The body component 22, as seen in
The device 10 may operate as follows. The first sensor 12 may be installed within the head component 24, either positioned between the inner surface of the head component 24 and the user's head or connected to padding on the interior of the head component 24. If utilized, the second sensor 14 may be coupled to or integrated with a mouth guard, which is worn in the user's mouth. For embodiments in which there is one linkage element 16, the first anchor 26 may be attached to the head component 24, and the second anchor 28 may be attached to the body component 22. For embodiments with more than one linkage element 16, at least the left first anchor 26A and the right first anchor 26B may be attached to the head component 24 and the left second anchor 28A and the right second anchor 28B may be attached to body equipment.
The first sensor 12 and the second sensor 14 may measure the force of impacts on the head component 24 and may communicate the sensor measurements to the processing element 18 at frequency rates ranging from 500 Hz to 20 kilohertz (kHz) or higher. While the values of the sensor measurements are less than the injury level (which should be most of the time), the linkage element 16 may be fully flexible—allowing the head component 24 nearly complete freedom of movement with respect to the body component 22.
When the head component 24 receives an impact with a force that could potentially cause traumatic brain injury to the user, then various components of the sensor measurements from the first sensor 12 and/or the second sensor 14 have a value greater than or equal to the injury level. In some embodiments, there may be more than one injury level value associated with the sensor measurements. The processing element 18 receives the sensor measurements and makes a determination as to whether the injury levels have been reached or exceeded using the methods and techniques described above. Upon determination that a dangerous impact has occurred, the processing element 18 may generate or assert the locking signal to the locking elements 38, 44 of the first anchor 26 and the second anchor 28 of the one or more linkage elements 16. The locking signal may activate or energize the electromagnets 40, 46, which generate a strong force of attraction to the first ball components 48, 54 of the first end link 30 and the second end link 32. As a result, the first end link 30 and the second end link 32 may be locked in their position just after the impact was received. Furthermore, with the first end link 30 and the second end link 32 locked in position, the middle link 34 may become locked in position as well, rendering the entire chain of the one or more linkage elements 16 rigid. When the one or more linkage elements 16 are rigid, the head component 24 becomes rigidly integrated with the body component 22 such that energy imparted to the head component 24 is transferred to the body component 22 and absorbed by the body. This also reduces the magnitude of the acceleration or deceleration of the head, thereby reducing the possibility or severity of concussive traumatic brain injury. For embodiments with more than one linkage element 16, the left linkage element 16A and the right linkage element 16B being positioned on the left and right sides of the head may provide a greater reduction of the magnitude of the acceleration or deceleration of the head from side impacts.
Mechanisms other than electromagnets may also be utilized in order to generate the necessary rigidity for energy dissipation. These mechanisms may include, but are not limited to, linear solenoids with fast respond times, among others. For embodiments with bypass valves and solenoid valves, similar switching mechanisms are involved.
The duration of the transmission or assertion of the locking signal, and thus the rigidity of the one or more linkage elements 16, may range from approximately 100 ms to approximately 300 ms. After that time period, the locking signal is no longer transmitted or asserted, and the one or more linkage elements 16 are again flexible.
A system 100 for reducing traumatic brain injury constructed in accordance with a second embodiment of the current invention is shown in
The first sensor 112, the second sensor 114, the one or more linkage elements 116, the processing element 118, and the memory element 120 are substantially similar to the first sensor 12, the second sensor 14, the one or more linkage elements 16, the processing element 18, and the memory element 20 of the device 10.
The head component 122 is generally worn on the head of the user. Typically, the head component 122 covers at least a portion of the top, the sides, and the rear of the head. In some embodiments, the head component 122 may include a plurality of rigid or semi-rigid straps that cover the crown and a portion of the top of the head. In other embodiments, the head component 122 may include headgear, a helmet, or the like. The head component 122 may also retain the first sensor 112 and the processing element 118.
The body component 124 is generally worn on the body of the user. In some embodiments, the body component 124 may include a body harness with a plurality of rigid or semi-rigid straps extending from the back of the upper torso to the front of the upper torso of the user over the shoulders and/or under the arms. In other embodiments, the body component 124 may include shoulder pads, a ballistic vest, body armor, a backpack, or the like. In all embodiments, the body component 124 may be not only sufficiently rigid to be effective for energy dissipation but also sufficiently flexible to be comfortable to the user.
The one or more linkage elements 116 may couple to the head component 122 and the body component 124 in a similar fashion to the one or more linkage elements 16 and the head component 24 and the body component 22 in the device 10 described above.
The system 100 may operate as follows. The head component 122 and the body component 124 may be worn by the user. The second sensor 114, if utilized, may be integrated with a mouthpiece which is worn in the user's mouth. The rest of the system 100 may function in a substantially similar fashion to the device 10, discussed above. In summary, if the processing element 118 determines an impact to the head that is at or above the injury level, then the processing element 118 may send a locking signal to the one or more linkage elements 116 to render them rigid for approximately 100 ms to approximately 300 ms. Afterwards, the locking signal is no longer transmitted or asserted, and the one or more linkage elements 116 are again flexible.
A system 200 for reducing traumatic brain injury for a group of people constructed in accordance with a third embodiment of the current invention is shown in
Each device 210, as seen in part in
Each wireless transceiver 230, as seen in
Each wireless transceiver 230 may be in communication with the processing element 218 for one device 210. The processing element 218 may communicate a locking signal to the wireless transceiver 230, which may wirelessly transmit the locking signal to the other wireless transceivers 230 in the area. In some embodiments, the wireless transceiver 230 may not transmit the locking signal itself, but rather a signal or data that corresponds to the locking signal. The wireless transceivers 230 of other group members may receive the locking signal and communicate it to the associated processing element 218, the associated one or more linkage elements 216, or both. Furthermore, in certain embodiments, each wireless transceiver 230 may act as a repeater, wherein if a wireless transceiver 230 receives the locking signal, then it may transmit the locking signal as well. Thus, the transmission range of the system 200 is increased by having all of the wireless transceivers 230 transmit the locking signal whenever any device 210 detects a threatening impact.
The system 200 may operate as follows. Each device 210 may be installed or implemented and worn in a similar fashion to the device 10 described above. Given that each wireless transceiver 230 is coupled to a device 210, the wireless transceiver 230 is worn as well. The first sensor 212 and the second sensor 214 of each device may function similarly to the like-named components of the device 10, measuring the acceleration resulting from impacts to the head of each group member.
When the first sensor 212 or the second sensor 214 of one group member measures a significant impact and the processing element 218 determines that the sensor measurement is at or above the injury level, then the processing element 218 may generate or assert the locking signal and communicate it to the associated one or more linkage elements 216. In turn, the one or more linkage elements 216 of the directly impacted group member may become rigid, as described above for the device 10. The processing element 218 may also communicate the locking signal to the associated wireless transceiver 230, which in turn may broadcast the locking signal to the other wireless transceivers 230 in the vicinity.
Each wireless transceiver 230 within range of the originating wireless transceiver 230 may receive the locking signal. In some embodiments, each wireless transceiver 230, upon receipt of the locking signal, may transmit the locking signal as well, thereby increasing the effective range of the system 200. On each device 210, the wireless transceiver 230 may communicate the locking signal to the associated one or more linkage elements 216, which in turn may become rigid just as if the locking signal were received from the associated processing element 218. Thus, the linkage elements 216 for all devices 210 in the vicinity of the originating device 210 may become rigid as a result of the impact experienced by the originating device 210. In effect, an impact on one member of the group becomes an impact to all members of the group. In various embodiments, the linkage elements 216 may remain rigid for a longer period of time as compared with the linkage elements 16 of the device 10. For example, the linkage elements 216 may remain rigid for 100-300 msec before becoming flexible again.
A system 300 for reducing traumatic brain injury for a group of people in a vehicle constructed in accordance with a fourth embodiment of the current invention is shown in
The devices 310, including linkage elements 316, and the wireless transceivers 330 may be substantially similar to the devices 210, the linkage elements 216, and the wireless transceivers 230 of the system 200. Furthermore, the devices 310 may couple to and interact with the head components 322 and the body components 324 in a similar fashion as the like-named components discussed above for the system 200.
The vehicle sensor 332, as seen in
The vehicle processing element 334, as seen in
The vehicle transmitter 336, as seen in
The vehicle transmitter 336 may be integrated with or packaged with the vehicle processing element 334 and/or the vehicle sensor 332. In embodiments of the system 300 with a plurality of vehicle sensors 332, there may be a plurality of vehicle transmitters 336, one vehicle transmitter 336 for each vehicle sensor 332, or there may be one vehicle transmitter 336, such that all of the vehicle sensors 332 are connected to the vehicle transmitter 336 through electrical wires or cables.
The system 300 may operate as follows. The devices 310 and the wireless transceivers 330 may be implemented and may operate in a substantially similar fashion to the like-named components of the system 200. The vehicle sensor 332 may be making measurements of the acceleration, velocity, or force affecting the vehicle on a regular basis and communicating the vehicle sensor measurements to the vehicle processing element 334. When the vehicle processing element 334 determines that a value of the vehicle sensor measurement is at or above the critical level, the vehicle processing element 334 may generate or assert the locking signal to the vehicle transmitter 336, which in turn broadcasts the locking signal to the wireless transceivers 330 of all of the members of the group. Each wireless transceiver 330 may communicate the locking signal to its associated one or more linkage elements 316, rendering the linkage elements 316 rigid. Thus, when the vehicle comes under attack, the head component 322 and body component 324 of each member of the group may become rigidly integrated in order to protect the members from possible traumatic brain injury as a result of vehicular damage or overturning of the vehicle. As with the system 200, the linkage elements 316 may remain rigid for 100-300 msec before becoming flexible again.
At least a portion of the steps of a method 400, in accordance with a fifth embodiment of the current invention, of reducing traumatic brain injury is shown in
Referring to step 401, sensor measurements are generated from a first sensor 12. The sensor measurements may include a linear acceleration or an angular acceleration. The first sensor 12 may include accelerometers or other devices that measure velocities, accelerations, or forces. The first sensor 12 may be coupled or attached to a head component 24, which may include a helmet worn on a user's head. Thus, the first sensor 12 may measure a linear or angular acceleration of a user's head as the result of an impact or blow to the head. The sensor measurements may be received by a processing element 18.
Referring to step 402, it is determined if a value of the sensor measurements is greater than or equal to one or more injury levels. The sensor measurements may include three orthogonal-axis linear or angular values from which the processing element 18 may determine whether the injury levels have been reached or exceeded using the methods and techniques described above for the device 10. An example of injury level values may include 50 G, 4000 rad/sec2, or a dynamic level.
Referring to step 403, a locking signal is transmitted to a linkage element 16 when the value of the sensor measurements is greater than or equal to the injury level. The locking signal may include a binary data value, a binary logic level, a pulse-width modulated signal, a voltage value, a current value, or the like.
Referring to step 404, a state of the linkage element 16 is switched from a relatively flexible state to a relatively rigid state. The linkage element 16 may be formed from material or components whose stiffness or rigidity can be controlled, that is, increased and decreased. In exemplary embodiments, the linkage element 16 may be formed from a plurality of components and may include a first anchor 26, a second anchor 28, a first end link 30, a second end link 32, and at least one middle link 34, as shown in
Under normal circumstances, the linkage element 16 is flexible and the links 30, 32, 34 may rotate freely with respect to one another and with respect to the anchors 26, 28 such that the linkage element 16 may assume a variety of shapes and positions. The head component 24 and the body component 22 may also move with respect to one another. When the linkage element 16 receives the locking signal from the processing element 18, the linkage element 16 becomes rigid and retains its current shape and position. Typically, the linkage element 16 remains rigid for approximately 100 ms to approximately 300 ms. The first and second anchors 26, 28 each include a locking element 38, 44 that locks the links 30, 32, 34 in their current positions. Furthermore, with the linkage element 16 momentarily locked in position, the head component 24 and the body component 22 momentarily maintain their relative positions as well, thereby allowing energy received by the head component 24 to be transferred through the linkage element 16 to the body component 22 to be dissipated.
Additional embodiments of the present invention are depicted in
The above-described method and other aspects of the invention may be implemented with a system 500 for reducing traumatic brain injuries or players on a football field or other sports field. An embodiment of the system 500 is shown in
As described in detail below, the processing element 508 is programmed for determining locations of each player wearing the transmitters 502. The processing element determines the locations of the players based on the signals transmitted from the transmitters 502. The processing element 508 then determines if any of the players are likely to impact one another based on the locations of the players and transmits an activating signal to the head-stabilizing component 506 of a player about to experience an impact to inhibit motion of the player's head. The processing element 508 may be further programmed to determine a force at which a player is likely to impact based on the signals transmitted from the transmitters 502 and to transmit the activating signal to the head-stabilizing component 506 only if the force exceeds a threshold force value.
Each of the components of the system 500 will now be described in more detail. The transmitters 502 may be any devices that can be worn by players or other users and that transmit signals to the sensors 504. The transmitters 502 may send signals when interrogated by the sensors 504 and/or triggered by internal or external controllers. For example, the transmitters 502 may be radio frequency identification (RFID) tags or transponders that send signals when interrogated by the sensors 504. Exemplary RFID transmitters are disclosed in U.S. Patent No 6,686,829, which is hereby incorporated in its entirety by reference. Each transmitter 502 may include antennas, signal or data receiving circuits, and signal or data transmitting circuits. Each transmitter 502 may transmit and receive radio frequency (RF) signals and/or data and may operate utilizing communication standards such as cellular 2G, 3G, or 4G, Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard such as Wi-Fi, IEEE 802.16 standard such as WiMAX, Bluetooth™, Bluetooth™ LE, or combinations thereof. Each transmitter 502 may be integrated with or packaged with a processing element and/or other electronic device 210.
Any number of the transmitters 502 may be affixed to each user. When used for American football, two transmitters are preferably affixed to or near the shoulder pads of each player as shown in
The sensors 504 may be any devices capable of receiving signals from the transmitters 502 and conveying the signals to the processing element 508. For example, the sensors 504 may be radio frequency identification (RFID) interrogators or readers such as those disclosed in the above-identified U.S. Pat. No. 6,686,829. The sensors 504 may alternatively employ any known wireless signal reception technology.
When the present invention is implemented on an American football field, the sensors 504 may be spaced along the length of the football field as shown in
The head stabilizing component 506 may be any protective device that can be worn by an athlete or other user and that can be switched to a protective state by the processing element 508. In one embodiment, the head-stabilizing component 506 includes a head component configured to be worn on the user's head, a body component configured to be worn on the user's body, and a linkage element that connects the head component and the body component. A locking signal sent from the processing element 508 switches a state of the linkage element from a relatively flexible state to a relatively rigid state so as to more firmly link the user's head to the user's body. A particular embodiment of the linkage element is described in detail above and includes a first anchor configured to rigidly couple to the head component; a second anchor configured to rigidly couple to the body component; a first end link coupled to the first anchor and configured to rotate and pivot with respect to the first anchor; a second end link coupled to the second anchor and configured to rotate and pivot with respect to the second anchor; and a middle link coupled to the first anchor and the second anchor and configured to rotate and pivot with respect to both the first anchor and the second anchor. In some embodiments, the head stabilizing component is the device 10 described above with or without the sensors 12, 14.
The processing element 508 is coupled with the sensors 504 and is in wireless communication with the head stabilizing component 506. The processing element 508 is programmed for determining locations of each user wearing the transmitters 502 and actuating one or more of head-stabilizing components 506 when it determines one or more of the players is likely to collide with another player or object on or near the sports field. As explained in more detail below, the processing element 508 determines the locations of the players based on the signals transmitted from the transmitters 502; determines if the players are likely to impact one another based on the current locations of the players and/or objects on the field; and transmits activating signals to the head-stabilizing components 506 to inhibit motion of the players' heads before any impact occurs. In some embodiments, the processing element 508 also determines a force at which the players are likely to impact and transmits the activating signals to the head-stabilizing components only if the force exceeds a threshold force value.
An embodiment of the processing element 508 may include processors, microprocessors, microcontrollers, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), analog and/or digital application-specific integrated circuits (ASICs), or the like, or combinations thereof. The processing element 508 may generally execute, process, or run instructions, code, code segments, software, firmware, programs, applications, apps, processes, services, daemons, or the like, or may step through states of a finite-state machine. The processing element may be operably coupled to a memory element 510, which may include, or may constitute, a “computer-readable medium”. The memory element 510 may store data from the transmitters 502 and sensors 504 as well as instructions, code, code segments, software, firmware, programs, applications, apps, services, daemons, or the like that are executed by the processing element 508. The memory element 510 may also store settings, data, documents, images, databases, and the like. The processing element 508 may be in communication with the memory element 510 through address busses, data busses, control lines, and the like. The processing element further includes or is in communication with a wireless transmitter 512 configured to transmit signals such as the above-described locking signals to the head-stabilizing component 506.
The processing element 508 determines the locations of two or more players and derives data on distances between the players in real time. The locations of fixed objects such as goal posts, benches, walls, etc. may be stored in the memory 510 so the processing element can determine distances between these objects and the players as well.
The processing element 508 also derives data on the instantaneous velocities and accelerations of the players in XY coordinates, in real time, from the player location data. The processing element 508 then derives data on the relative instantaneous velocities and accelerations between any two players as a function of the data mentioned above and predicts future locations of the players based on this data.
The processing element 508 determines the probability of a collision between any two players and/or a player and an object based on predicted future locations of the players as a function of present and past locations, speeds, and accelerations of the players. For example, the processing element may predict future locations of the players and possible collisions by deriving data on the distances between the players 40 msec into the future, 80 msec into the future, etc. When the physical distance between any two players becomes less than or equal to the approximate dimensions of the players, a collision is to be anticipated.
After predicting an impending impact and before the impact actually takes place, the processing element 508 activates the head-stabilizing component worn by at least some of the players. For example, in one embodiment, the processing element sends an activating signal to activate the linkage elements in the device 10 described above and change its linkage elements from a flexible state to a rigid state at the time when the impact is anticipated to occur. The present invention is therefore capable of setting up an impedance-matched pathway for dissipating impact energy to a player's head immediately at or slightly before the time of a collision. The invention uses a similar strategy to protect a player from a player-ground collision, such as in a fall as a result of a tackle.
The processing element 508 de-activates the head-stabilizing component 506 immediately after a collision so that the player may resume play after the collision event is over. For example, when used with the device 10 described above, the processing element terminates the rigidity of the linkage elements within 100-300 msec (for reference purpose, the duration of a typical eye blink is between 300 and 400 msec).
In
From the data in
From the data in
Furthermore, the relative instantaneous velocities between any two players at a specific time can be computed. At a specified ti, the relative instantaneous velocities may also be expressed as vectors, e.g. v12(ti), v13(ti), v14(ti). For example v12(ti) may be calculated at [v1(ti)−v2(ti)].
As long as the instantaneous velocities of the three players may be expressed as vectors, e.g. v1(ti), v2(ti), and v3(ti), and as long as these vectors may be calculated by using only 2 consecutive timed samples of locations, the anticipated future locations of each player can be computed as a function of some future time. For example, at the instant when the processor has just received the most recent RFID location data from all three players, it is feasible to compute the distances between any two players at a specific future time, e.g. 40 msec into the future, expressed as [x1(ti+40), y1(ti+40)], [x2(ti+40), y2(ti+40)], and [x3(ti+40), y3(ti+40)].
Because the calculations may be carried out by computer operations of the processing element 508, the entire calculation process may be expected to be nearly instantaneous or take no more than a fraction of a msec. Furthermore, instantaneous velocities of the players is assumed to remain unchanged in the next 40 msec, then the distances between the players 80 msec into the future may be computed as [x1(ti+80), y1(ti+80)], [x2(ti+80), y2(ti+80)], and [x3(ti+80), y3(ti+80)]. The assumption that instantaneous velocities of the players remain constant for 40 msec is well justified. Results from numerous kinematic studies of human movements support this assumption. For example, in a review on human movements by Miall and Wolpert (1996), muscles monitored by EMG (electromyogram) only began to respond 100 msec after the application of a perturbation. The response generally reached peak amplitude in another 100 msec. Preliminary data from applicant's own studies also support this assumption. These results indicate that it may be feasible to predict future human movement pattern by assuming that the human body continues to move in the same direction as long as the “future” is short-term and is ˜80-100 msec from the present.
Using the information described above, the processing element 508 may compute the probability of a collision between any two players at a specific future time. For example, at a specified tj, the collision probabilities are expressed as p12(tj) and p13(tj). Here, the probability is defined by: (1) pmn will be zero if the distance between player m and player n are >> than the dimensions or sizes of players, Sm and Sn (here Sm and Sn may be set to equal to the distance between the two RF transmitters affixed to the shoulder pads of player m and player m, respectively); (2) pmn will be one or 100% if the distance between player m and n are << than the dimensions or sizes of players, Sm and Sn, (1) pmn will be set to a value that is equal to [2dmn/(Sm+Sn)] if the distance dmn between player m and n are of the same order as Sm and Sn.
If predictions of collisions are attempted too far into the future, for example ˜10 seconds into the future, the accuracy may be poor, e.g. ˜0%. If predictions are attempted for ˜1 second into the future, the accuracy may be better, e.g. ˜50%. And if predictions are attempted for ˜0.1 second or 80 msec into the future, the accuracy may be much better, e.g. >95%. This is because the movement pattern of players are determined by (1) volitional movement control by multiple major brain centers including those that are within the non-specific cerebral cortical areas and the cortical pyramidal motor system, (2) subconscious motor control by the extrapyramidal motor system outside of the cerebral cortexes, such as the basal ganglia, the cerebellum, and the brainstem as well as spinal structures governing spinal reflexes, (3) intrinsic skeletomuscular strength, and the inertia of the parts of the human body directly involved in the movement. All these factors combine to determine the trajectory of any human movement. Over a period of 1 second to 10 seconds or longer into the future, the movement patterns in human kinematics are difficult to predict. Within 80 msec, however, the movement patterns in human kinematics are easy to predict as most of the complex mechanisms, e.g. (1) and (2) mentioned above, may not be able to come on-line that quickly. Therefore, predictions into the next 80 msec are quite accurate, e.g. at better than 95% accuracy. This confidence band is supported by numerous studies on human motor control and is also consistent with preliminary results from applicant's laboratory.
The ability to predict a collision or impact event in a period of 80 msec into the future plays a critical role in the implementation of aspects of the present invention. As set forth above, an important technological requirement is that the processing time must be so fast that it takes no more than 5-7 msec to make an accurate determination as to whether the impact event at hand may be injurious to a player. Although it is technologically feasible to satisfy this requirement, the requirement may be burdensome. The application of RFID technology in the present invention may offer a welcome relief in that 80 msec of advance collision warning may be available to protect against concussive traumatic brain injuries. Although this point is not immediately obvious or very useful to the current adopters of RFID technology, being able to predict an impending collision between players 80 msec before the collision takes place is very useful in the application of MEMS (MicroElectro-Mechanical Systems) technology in concussion prevention.
Furthermore, it is feasible to issue a locking signal to activate the linkage elements of the devices 10 described above and change the linkage elements from a flexible state to a rigid state. Here the locking signal will be sent based on a prediction of player collision in a future time, e.g. tf. More specifically, the locking signal will be send at (tf−td) where td is the mechanical delay that is required to make the rigidity happen. In this way, the present invention is able to time the locking signal so that the linkage element rigidity will occur at or slightly before a collision will actually occur.
Furthermore, it is feasible to de-active the linkage elements and change the linkage elements from a rigid state to a flexible state within 100-300 msec of the collision or impact event. Because the period of rigidity is transient and brief, the rigidity will present minimal interference to the head-and-neck mobility of the athlete. A beneficial corollary is that when implementing protection protocol, the processor that is responsible for issuing the locking signal can err on the side with more protection in mind since the cost of a false-positive (measured by interference to the head-and-neck mobility) is low.
Furthermore, if a third transmitter is attached to the player just below waist level as shown in
In some embodiments, the processing element 508 computes the force of magnitude of an anticipated collision. This may be estimated from the changes in instantaneous velocities of a player immediately before and immediately after a collision or impact event. This information is useful when some are instrumented with RFID technology as well as the preventive head stabilizing components of the present invention while others are only instrumented with RFID technology without the preventive protection. It may be feasible to compare collision or impact events of similar energy in order to examine whether players with head stabilizing components of the present invention may be significantly better off in terms of concussive traumatic brain injuries.
In some embodiments, the accuracy of the prediction process may be enhanced by statistically interpolating and extrapolating the raw data from the transmitters to generate accuracies in time exceeding the 40 msec limit set by the 25 Hz RF transmitters as well as accuracies in space exceeding the 6 cm or 2 in limit set by the intrinsic resolution of the RF detection system. In essence, the raw RF data contains only a punctate series of numbers at a time resolution of 25 Hz and spatial resolution of ˜2 in, but the processing element may perform additional computation to extract trend information of statistical significance from data points of the recent past. The processing element may further provide a smooth function for the prediction of future location information. Moreover, this information may be compiled on-the-fly or almost in real time.
In some embodiments, the processing element 508 may compare the accuracy of the predictive estimates of the anticipated future locations of each player as a function of time. For example, estimates on the anticipated future locations of each player may be compared with data on the actual locations of the players which should arrive at the processor moments (less than 40 msec) after the anticipated locations have been calculated. This comparison helps to generate a feedback as to whether the anticipated or the calculated future locations are indeed accurate. Moreover, this feedback information is useful as the processing element may machine-learn to be more conservative and shorten or to be bolder and lengthen the period for which a prediction of the future location of a player can be made with confidence. In other ways, the feedback may also allow the processing element to optimize computational algorithms by including additional features for the purpose of making more accurate anticipations on the future location of a player.
In some embodiments, it may be that the most optimized computation still does not generate a perfect prediction. It is then feasible to compute a system performance level based on the difference between the most optimized prediction of future locations of a player and the actual observed locations of a player. It is feasible to report the performance level of the prediction process to a central processor. Applicant expects the system performance level to be well above 95%.
In some embodiments, computations involving distances or relative instantaneous velocities between two players from the same team may be omitted so that the overall speed of the computation may be enhanced. This is because concussive traumatic brain injuries resulted from collision or impact from players of the same team are rare.
In some embodiments, computations involving distances or relative instantaneous velocities between two players when they are at a great distance apart (e.g. when the distance between player m and player n are >> than the dimensions or sizes of players, Sm and Sn) may be omitted so that the overall speed of the computation may be enhanced. This is because concussive traumatic brain injuries resulted from collision or impact from players of at a great distance apart is not possible.
Although the invention has been described with reference to the embodiments illustrated in the attached drawing figures, it is noted that equivalents may be employed and substitutions made herein without departing from the scope of the invention as recited in the claims.
