A system for tracking a bone-altering tool in computer-assisted surgery, comprising a first trackable reference secured to a first bone, with a first frame of reference being associated with the first trackable reference. A bone-altering tool is securable to the first bone in a secured configuration. Sensors track the trackable reference for position and orientation. A position/orientation calculator is connected to the sensor device to calculate a position and orientation of the first frame of reference. An alteration parameter calculator is associated with the position/orientation calculator to determine a position and orientation of the bone-altering tool in the secured configuration as a function of the position and orientation of the first frame of reference and of the secured configuration. A method for tracking tools using the tracking of a bone is provided.

Disclosed herein are devices, methods and systems for monitoring and detection of pressure on a part of a body of a user. In an embodiment, a device includes a substrate having a contact surface for contacting a user, one or more sacs associated with the contact surface of the substrate, and one or more sensors in communication with the one or more sacs, the one or more sensors adapted to measure changes in pressure in the one or more sacs. The sacs contain a fluidic material configured to transmit pressure. The fluidic material is further configured to be shock-absorbing and pressure-relieving such that the fluidic material is displaceable by an action of the user contacting the contact surface causing the pressure in the fluidic material to be redistributed.

A load measurement device includes an acquisition unit, a first extraction unit, a second extraction unit, and an output unit. The acquisition unit acquires measurement information output from a load distribution sensor that detects a load distribution received from a sole of a subject. The first extraction unit extracts a region having a load value equal to or larger than a first threshold value as a first region based on the measurement information, and detects the first region as a sole region. The second extraction unit extracts a second region having a load value equal to or larger than a second threshold value that is smaller than the first threshold value from a re-extraction target region defined with the first region as a reference, and adds the second region to the sole region. The output unit outputs information related to a load distribution of the sole region.

A gait state measurement device measures a gait state of a subject who is walking on a walking surface formed on a belt that runs along a circulation track. The gait state measurement device includes an acquisition unit, a position estimation unit, and a warning control unit. The acquisition unit acquires measurement information of a load distribution sensor that detects the load of the subject through the belt. The position estimation unit estimates the position of the sole of the subject based on the measurement information. The warning control unit performs a different type of warning depending on a relationship between the position of the sole of the subject and each of target areas that are defined according to an installation area of the load distribution sensor.

A gait state measurement device measures a gait state of a subject who is walking on a walking surface formed on a belt that runs along a circulation track. The gait state measurement device includes an acquisition unit, a position estimation unit, and a warning control unit. The acquisition unit acquires measurement information of a load distribution sensor that detects the load of the subject through the belt. The position estimation unit estimates the position of the sole of the subject based on the measurement information. The warning control unit performs a different type of warning depending on a relationship between the position of the sole of the subject and each of target areas that are defined according to an installation area of the load distribution sensor.

In some examples, an apparatus comprises a platform having an upper surface to contact a plantar surface of a human foot positioned on the platform, a first pressure sensor to sense a pressure applied to the upper surface by a heel of the human foot, and a first probe extending through an opening in the platform and movable vertically upward through the opening to probe an adipose layer on a bottom of the heel. The apparatus also comprises a first actuator to displace the first probe upwardly against the adipose layer with a predetermined force, and a linear displacement sensor to sense a vertical displacement of the first probe.

Systems for detecting, locating and mitigating impact forces directed towards a person's head are described herein. The systems include devices for wearing on a wearer's head. The devices include a base configured to conform to the wearer's head and retain a plurality of pouches on an outer surface of the base. The plurality of pouches are configured to absorb at least a portion of the impact force directed towards the outer surface of the base, provide an indication when the impact force directed towards the outer surface of the base has a magnitude exceeding a concussion-indicating level of force, and provide a location of impact when the impact force directed towards the outer surface of the base has a magnitude exceeding the concussion-indicating level of force.

In some examples, a medical device includes an elongated body defining an inner lumen. The medical device further includes an anchoring member and a first sensor at a proximal portion of the elongated body, and a second sensor at a distal portion of the elongated body or distal to a distal end of the elongated body. The second sensor is configured to sense a substance of interest and the elongated body comprises a material that is a substantially non-permeable to the substance of interest.

Systems, methods, apparatuses, and computer program products for contact-free heart rate monitoring and/or measurement are provided. One method may include receiving video(s) that include visual frame(s) of individual s) performing exercises, detecting some exposed skin from the video(s), and performing motion compensation to generate color signals for the exposed skin to precisely align frames of the exposed skin. The method may also include generating the color signals by estimating a skin color for each frame by taking a spatial average over pixels of a cheek of the face(s) for R, G, and B channels, respectively, applying an operation to remove remaining motion traces from the frames such that the heart rate traces dominate, and extracting and/or outputting the heart rate of the individuals using a frequency estimator of the skin color signals.

Systems and methods are disclosed to determine a measure of patient weight using existing medical device sensors, comprising receiving acceleration information of a patient and, if a value of the acceleration information exceeds an activity threshold over a measurement window, detecting patient steps in the measurement window using the acceleration information, determining a patient step rate over the measurement window using the detected patient steps, determining a measure of patient step force for the measurement window, and determining a measure of patient weight using the determined patient step rate and measure of patient step force.