Abstract: A system configured to be at least partially implanted along an aorta includes an inelastic, static member and a pinching member. The pinching member is configured to receive an activation signal at an activation rate and in response to the activation signal, repeatedly compress the aorta at the second location at the activation rate to pump fluid within the aorta in a desired pumping direction. The system is configured to selectively control wave reflections in order to achieve both improved wave dynamics to reduce cardiac load and increased (or at least non-diminished) blood flow to targeted organs within the cardiovascular system.

Abstract: Membranes are provided to be specially developed for use in chambers for artificial circulatory assistance which may be employed primarily in cardiovascular procedures, notably to produce arterial capacitance, to regulate blood pressure, to produce aortic counterpulsation and to pump blood. The membrane may have circular sections that may vary in size or not depending on the function to be performed and are interconnected so that the transition between one section and the other is smooth, regardless of the size of each section. Further, chambers and pumps may be used for cardiopulmonary bypass and a pumping system.

Abstract: The invention relates to a rotor bearing system (1). Said system comprises a housing (80) in which a first permanent magnet (30) is mounted such that it can rotate about a first axis (105). A rotor (70) for conveying a liquid comprises a second hollow-cylindrical permanent magnet (40), which is mounted such that it can rotate about a second axis. The first permanent magnet (30) and the second permanent magnet (40) overlap axially at least partially, wherein the first permanent magnet (30) is disposed offset relative to the second permanent magnet (40). In the axial overlap region (160) of the first permanent magnet (30) and the second permanent magnet (40), the housing (80) is positioned between the two permanent magnets (30, 40).

Abstract: In an implanted medical device system, an internal controller, external power transmitter and methods for regulation of TETS power for an implanted medical device system are disclosed. According to one aspect, a method in an external power transmitter of an implanted medical device system includes determining a current in an external coil of the external power transmitter, multiplying the determined current by a supply voltage to determine a power delivered to the external coil, and controlling the power delivered to the external coil by adjusting the current in the external coil.

Abstract: Incorrect connection or mapping of leads' proximal terminals to the ports of an Implantable Stimulator Device (ISD), such as an implantable pulse generator or an external trial stimulator, is a concern, and this disclosure is directed to use of measurement and identification algorithms to either determine that leads are properly connected to their assigned ISD ports, or to determine which leads are connected to the ports even if the leads are not preassigned to the ports. Particular focus is given in the disclosed technique to assessing leads that comprise larger number of electrodes than are supported at each port, and thus have more than one proximal terminal that connect to more than one port of the ISD.

Abstract: The present invention provides materials and methods for using electrical stimulation to treat a mammal having a proteinopathy (e.g., neurodegenerative diseases) or at risk of developing a proteinopathy are provided. For example, the present invention provides materials and methods for modulating glymphatic clearance (e.g., enhancing glymphatic clearance) of pathogenic proteins.

Abstract: A method for treating a herniated intervertebral disc is provided, the method including implanting an electrode mount crossing an annulus fibrosus of the herniated intervertebral disc of a subject, such that the electrode mount holds at least one intra-pulposus exposed electrode surface in place in a nucleus pulposus of the herniated intervertebral disc. Control circuitry is activated to treat disc herniation by creating an electric potential difference between the at least one intra-pulposus exposed electrode surface and one or more extra-pulposus exposed electrode surfaces implanted outside the nucleus pulposus in electrical communication with the herniated intervertebral disc. Other embodiments are also described.

Abstract: Disclosed herein are methods of increasing sensitivity of a cancer cell to alternating electric fields comprising exposing the cancer cell to an alternating electric field for a period of time, the alternating electric field having a frequency and field strength, and exposing the cancer cell to an IGFR1 inhibitor, JNK inhibitor, RPS6 inhibitor or ERK inhibitor. Disclosed are methods of increasing treatment efficacy comprising applying an alternating electric field to a target site of the subject for a period of time, the alternating electric field having a frequency and field strength, wherein the target site comprises one or more cancer cells, and administering a therapeutically effective amount of one or more of an IGF1R inhibitor, JNK inhibitor, RPS6 inhibitor, and/or ERK inhibitor to the subject.

Abstract: A method including causing current to flow from a first electrode of an intra-cochlea electrode array to a second electrode of the intra-cochlea electrode array at a plurality of temporal locations, measuring, at a third electrode and a fourth electrode of the intra-cochlea electrode array, a voltage induced by the flowing current at the plurality of temporal locations and determining that a change between the voltage measurements at the third electrode and the fourth electrode has occurred from the first temporal location to the second temporal location.

Abstract: Systems and techniques are disclosed to establish programming of an implantable electrical neurostimulation device for treating chronic pain of a human subject, through the use of a dynamic model adapted to determine pain treatment parameters for a human patient and identify a new device operational program to implement the pain treatment parameters to address the chronic pain condition.

Abstract: Systems and techniques are disclosed to establish programming of an implantable electrical neurostimulation device for treating pain of a human subject, through the use and adjustment of analgesic stimulation parameters based on trust dynamics and trust measurements. In an example, the system to establish programming of the neurostimulation device performs operations that: determine a trust measurement value that is derived from results of at least one commitment made with a human subject, via observable interactions; determine a modification of at least one neurostimulation programming parameter, based on the trust measurement value; and to cause the implantable neurostimulation device to implement the modification of the at least one neurostimulation programming parameter. Further examples are provided to produce and track the trust measurement value, as well as identify a pain susceptibility value and determine a receptiveness to analgesic effects based on these and other trust dynamics.

Abstract: An implantable medical device (IMD) configured to provide stimulation therapy using an instruction set architecture (ISA) includes a main processor operating at a first frequency and a secondary processor operating at a second frequency lower than the first frequency. Example ISA may comprise assembly-language-like instructions that may be executed by the secondary processor for configuring one or more stimulation engines (SEs) to cause stimulation of select electrode sets of a lead system based on one or more pulse definitions and one or more timing definitions corresponding to a therapy program selection effectuated by a user at an external device.

Abstract: Methods and systems for seamless adjustment of treatment are disclosed. A determination can be made as to whether to intervene with a patient's treatment based on data obtained from implantable electrodes and/or non-implantable electrodes. The data from non-implantable electrodes have a correction factor applied to adjust for less accuracy compared to data acquired from implantable electrodes.

Abstract: A medical device is configured to generate an acceleration signal and a temperature signal. The device is configured to determine an activity metric from the acceleration signal that is representative of patient physical activity. In response to determining that the activity metric is equal to or greater than a previously determined activity metric, the device is configured to adjust a target cardiac pacing rate based at least on a temperature change determined from the temperature signal. The device may include a pulse generator for generating cardiac pacing pulses based on the target cardiac pacing rate.

Abstract: An emulation apparatus emulates an electrophysiological signal derived from a target area of a human or animal nervous system under the influence of a stimulation signal applied to the human or animal body. A prior signal generator generates a prior signal representing an electrophysiological signal in the absence of stimulation. A test signal representing a stimulation signal is received and used by a modelling unit to derive a modulation signal representing the degree of modulation of the electrophysiological signal, in accordance with a model of the temporal evolution of the modulation of the electrophysiological signal caused by the stimulation signal. A modulation unit modulates the prior signal in accordance with the modulation signal to output an emulation signal representing an electrophysiological signal derived under the influence of the stimulation signal. The emulation apparatus has wide use in neuroscience research, bioengineering and clinical applications.

Abstract: Systems and methods are disclosed for use with Implantable Medical Devices (IMD) such as Implantable Stimulator Devices. The system includes a permanent magnet which can be used to reset the IMD (such as during an emergency) and to place the IMD in a pairing mode to establish communications with an external device. An external device paired to the IMD can be used to place the IMD in an MRI mode that renders the IMD safe during a Magnetic Resonance Imaging (MRI) scan. In the event that the external device is unavailable to cause the IMD to exit the MRI mode, the bar magnet can also be used in the MRI mode to pair the IMD with another external device.

Abstract: A leadless biostimulator including an attachment feature to facilitate precise manipulation during delivery or retrieval is described. The attachment feature can be monolithically formed from a rigid material, and includes a base, a button, and a stem interconnecting the base to the button. The stem is a single post having a transverse profile extending around a central axis. The transverse profile can be annular and can surround the central axis. The leadless biostimulator includes a battery assembly having a cell can that includes an end boss. A tether recess in the end boss is axially aligned with a face port in the button to receive tethers of a delivery or retrieval system through an inner lumen of the stem. The attachment feature can be mounted on and welded to the cell can at a thickened transition region around the end boss. Other embodiments are also described and claimed.

Abstract: An extra-cardiovascular implantable cardioverter defibrillator (ICD) having a high voltage therapy module is configured to control a high voltage charging circuit to charge a capacitor to a pacing voltage amplitude to deliver charge balanced pacing pulses. The capacitor is chargeable to a shock voltage amplitude that is greater than the pacing voltage amplitude. The ICD is configured to enable switching circuitry of the high voltage therapy module to discharge the capacitor to deliver a first pulse having a first polarity and a leading voltage amplitude corresponding to the pacing voltage amplitude for pacing the patient's heart via a pacing electrode vector selected from extra-cardiovascular electrodes. The high voltage therapy module delivers a second pulse after the first pulse. The second pulse has a second polarity opposite the first polarity and balances the electrical charge delivered during the first pulse.

Abstract: Disclosed is a skin care device using plasma. The skin care device may include a first plasma generating device; and a main body configured to supply power to the first plasma generating device and to control the first plasma generating device based on an input from a user.

Abstract: The present invention provides methods and compositions for the remote control of cell function based on the use of a magnetic field to excite paramagnetic nanoparticles targeted to specific cell types. The cell type of interest expresses an ion channel wherein excitation of the paramagnetic nanoparticles results in a physical change that is transduced into a cellular response. Such cellular responses may include, for example, increases in gene expression resulting in production of one or more physiologically active proteins. The expression of such proteins can be used to treat a variety of different inherited or acquired diseases or disorders in a subject.

Abstract: A device for applying targeted phototherapy to an area of diseased skin to place a skin condition into remission and a method of determining a maximum tolerable dose of phototherapy applied to a treatment area of diseased skin to determine an optimum therapeutic dose to quickly place a skin condition into remission. The device can include a housing and an optical matrix arranged within the housing that are attached to a dosimetry device. The optical matrix includes a plurality of at least one of absorptive, reflective and/or partially transmissive regions or arrays of perforations that each permits a different percentage of light to be delivered to an individual's skin. Jigs can be included to arrange a plurality of varying exposures to be placed on the patient's skin. An assessment can then be made as to the maximum tolerable dose of phototherapy that can be applied to the individual's skin in order to place a skin condition into remission.

Abstract: An illumination apparatus is disclosed, comprising: a first light source having a first spectral light distribution with a first light intensity peak about a first peak wavelength, and a second light source having a second spectral light distribution with a second light intensity peak about a second peak wavelength being different from the first peak wavelength, a third light source having a third spectral light distribution with a main light intensity peak about a third peak wavelength being different from the first peak wavelength and from the second peak wavelength, wherein the illumination apparatus is configured to provide adjustment of light intensity of the first light source and of light of the second light source, wherein the illumination apparatus provides an adjustment of light intensity of the third light source to compensate for the adjusting of the relative light intensity between the first light source and the second light source.

Abstract: An ocular light therapy arrangement for treating a user having a neurologic disorder includes a light emitting device the emits a light having a flicker rate of less than or equal to about 2 Hz and/or greater than or equal to about 85,000 Hz at a wavelength of within a first range of from about 500 nm to about 565 nm, wherein the light is effective to reduce neurologic disorder symptoms by reducing stimulation of the user's retina and brain cortex.

Abstract: The provided is a handpiece for skin laser treatment and a medical laser treatment apparatus including the same. The disclosed handpiece for skin laser treatment may include a handpiece body including a laser irradiation portion for irradiating a laser beam to a treatment target area of the skin of a person to be treated and a refrigerant spraying portion for spraying a refrigerant in the treatment target area; and an end tool member provided at an end of the handpiece body and configured to maintain a distance between the laser irradiation portion and the skin in contact with the skin of the person to be treated and to at least partially limit a target area corresponding to the treatment target area.

Abstract: Systems and methods for accelerated online adaptive radiation therapy (“ART”) are described. The improvements to online ART are generally provided based on the use of textural analysis and machine learning algorithms implemented with a hardware processor and a memory. The described systems and methods enable more efficient and accurate online adaptive replanning (“OLAR”), which can also be implemented in clinically acceptable timeframes. For example, OLAR can be reduced from taking 10-30 minutes down to 5-10 minutes.

Abstract: A computer implemented method of treatment targeting includes receiving magnetic resonance (MR) images of a subject including a target region, generating at least one contour of at least one surrogate element apart from the target region in the MR images, and determining a location of the target region in each of the MR images based on a location of the at least one contour in the MR images.

Abstract: Certain configurations are described of devices that can receive and retain a radiation measuring device during administration of a nuclear medication. In some instances, the radiation measuring device can measure radiation levels being delivered through an intravenous line positioned within the device and connected to a patient. Methods and systems using the devices are also described.

Abstract: Provided are a calibration method, device and storage medium of radiotherapy equipment. The calibration method of the radiotherapy equipment adopts an imaging body disposed within a preset distance range of an isocenter of radiotherapy equipment to perform error calibration on the radiotherapy equipment, and includes: imaging the imaging body through an imaging system to obtain an actual image of the imaging body; determining an image deviation between the actual image and a theoretical image of the imaging body, wherein the theoretical image is determined in advance based on a theoretical position of the imaging system and a spatial position of the imaging body in a rack; and determining a system error of imaging system based on the image deviation. Thus, the imaging system is calibrated without moving a treatment couch. The calibration accuracy of imaging system is not influenced by movement precision of treatment couch. The calibration accuracy is improved.

Abstract: A radiotherapy system includes an X-ray target configured to convert an incident electron beam into a therapeutic X-ray beam, a purging magnet configured to redirect unwanted particles emitted from the X-ray target away from the therapeutic X-ray beam, and a particle collector configured to absorb the unwanted particles subsequent to redirection by the purging magnet. The particle collector may be configured to dissipate at least 50% of the energy of the incident electron beam.

Abstract: A device for providing hyperthermia treatment includes an ultrasound energy generator configured to apply low intensity ultrasound to target tissue. The low intensity ultrasound energy induces therapeutic heating in the tissue at or below the surface of the skin. In order to control the temperature of the tissue during therapy, a microwave radiometer, such as a Dicke radiometer, can be used to measure the temperature of the tissue and feed back the temperature measurement to the ultrasound energy generator to control ultrasonic energy produced and control the temperature of the target tissue.

Abstract: A centrifugal brake assembly comprises a pawl and a rotor. The rotor includes a receiving portion configured and arranged to receive a portion of the pawl. The pawl is movable relative to the rotor between an engaged position and a disengaged position. One of the pawl and the rotor has a curved slotted portion, and another of the pawl and the rotor has an elongated curved protrusion. The elongated curved protrusion at least partially extends within the curved slotted portion and moves generally along the curved slotted portion when the pawl moves between the engaged position and the disengaged position.

Abstract: Various embodiments of a respirator that includes a harness, a mask body, and an exhalation valve are disclosed. The exhalation valve can include a valve seat and a flexible flap that is in engagement with the valve seat. The flexible flap can have one or more materials that can cause the flap to flash when moving from a closed position to an open position or vice versa. The flashing valve can make it easier for a user to ascertain whether the valve is operating properly.

Abstract: The present invention provides methods and apparatus for use with common portable hose-equipped fire extinguishers that make the fire extinguishers usable and operable by persons having limited physical abilities. Embodiments of the apparatus include two aspects: a rigid lever lever, which may be provided in the shape of an “L”, and an adjustable harness with ring. The ring and lever with adjusting harness (RALAH) is intended to be installed on portable hose-equipped fire extinguishers. Embodiments of the invention include at least one harness strap attached to the fire extinguisher that may be released using a ring, and then wrapped over the head or shoulder of a user to support the fire extinguisher; a rigid (sometimes L-shaped) lever attached to both the handle and hose of the fire extinguisher; and at least one ring attached to the fire extinguisher hose that enables a person having limited physical abilities to manipulate the hose and discharge the contents of the extinguisher.

Abstract: Protective barrier for an item of industrial equipment that is traversed by and/or processes a combustible fluid or oxygen, having four vertical walls forming four sides of a parallelepiped, these walls being attached to a base so as to define a rectangular-section space that is intended to contain the industrial equipment arranged on the base, the four vertical walls having a height of at least 2.4 m and having at least one partial roof attached to at least one of the vertical walls, having a surface parallel to the base and extending over the space, the surface area of the partial roof or the surface area of each of the partial roofs being equal to at most 50% of the surface area corresponding to the rectangular section.

Abstract: In one or more arrangements, a system is presented for preventing the spread of fire through a conveyor opening in a fire wall. In one or more arrangements, a fire door system is connected to the fire wall and/or conveyor proximate to the conveyor opening. The fire door system includes a door assembly, a door frame assembly, and an actuator. The door frame assembly is connected to the fire wall, covers portions of the opening below the conveyor and between belts of the conveyor, and forms a door opening above the conveyor. The door assembly is configured to move between a closed position, where door assembly covers the door opening, and an open position, where the door assembly at least partially uncovers the door opening. The actuator is configured to cause the door to be moved to the closed position in response to fire.

Abstract: Tools for fire monitoring are presented. One method includes an operation for accessing values of features for monitoring a fire in a region. The features include satellite images at a first resolution, vegetation information, and weather data. Further, each satellite image includes first cells associated with the geographical region and the first resolution defines a first size of each first cell. The method further includes generating a map of the geographical region comprising a plurality of second cells having a second size, which is smaller than the first size. Additionally, the method includes operations for estimating, using a machine-learning model, probability values for the second cells in the map based on the features, each probability value indicating if the second cell contains an active fire, and for updating the map based on the probability values for the second cells. The map is presented in a user interface.

Abstract: The present invention discloses an automatic safeguard bottle system comprising one or more bottle which are provided with bottle valves, the bottle valves are connected with an electronic control device which can realize signal transmission with the controller, the electronic control device is opened by the controller, so that the gas in the upper cavity is discharged outward, the pressure of the upper cavity decreases, and the piston moves upward, so as to realize the automatic opening of the valve port, the medium in the bottle is released outward through the nozzle, the electronic control device is closed by the controller, and the piston moves down and reset, so as to realize the automatic closing of the valve port and stop the nozzle releasing the medium. The present invention has the functions of automatic starting and resetting, thereby realizing multiple medium releasing. The present invention also discloses an automatic control method of an automatic safeguard bottle system.

Abstract: A removable crossbar assembly and an exercise ladder arrangement including the removable crossbar assembly. The crossbar assembly is configured to be secured to an exercise ladder to provide an exercise crossbar disposed between two fixed exercise crossbars on the exercise ladder. The crossbar assembly may also include a brace for securing an independent exercise device to the crossbar assembly. The crossbar assembly advantageously provides the placement of a crossbar for exercising closer to the desired height of a participant, e.g., closer to the should height of a participant, to increase the efficacy of the exercise.

Abstract: A physical therapy assembly includes a platform that is positionable on a horizontal support surface thereby facilitating a user to stand on the platform. A support bracket is removably attachable to the platform and the support bracket has a grip that is integrated into the support bracket. The support bracket extends upwardly from the platform having the grip being spaced from the platform thereby facilitating the grip to be gripped by the user when the user stands on the mat. The support bracket is oriented to angle rearwardly on the platform thereby facilitating the user to perform assisted squats when the user grips the grip. In this way the support bracket facilitates the user to perform physical therapy exercises.

Abstract: Cable training devices are disclosed that are modular, lightweight, and portable. The disclosed cable training devices can be mounted to virtually any accessible surface or object via a modular mounting platform. The cable training devices include a base unit that is easily attachable to and removable from one or more modular spring plates that provide resistance. The base unit contains a reel or spool with a cable wound around it. Pulling on the cable is resisted by the attached modular spring plates, which each contain a coil or power spring. The modular spring plates can be added or removed from the base unit to vary the resistive force applied to the cable.

Abstract: A device and method for estimating a resistance of a wheel of a bicycle is disclosed. The device includes a mounting bracket, a disk, and a resistance adjustment knob. The mounting bracket is coupled to the bicycle. The disk is configured to indicate the resistance. The disk is located within the mounting bracket. The resistance adjustment knob is connected to the disk via a connector. Upon rotation of the knob, the connector rotates the disk for estimating the resistance of the wheel of the bicycle. The determined estimated resistance is visible on the disk.

Abstract: An explosive strength training device is provided. The explosive strength training device includes a cable set, a power box, a resistance motor and a controller. The cable set includes a rubber belt and a movable pulley block connected with one end of the rubber belt, the movable pulley block has a first main pulley disposed opposite to the rubber belt, and allows the pulling force of the rubber belt to pass through the center of the first main pulley. Through the labor-saving structure of the first main pulley, the middle section of the power belt is wound on the upper side of the first main pulley and fixedly sleeved on the positioning rod with the fixed side to form a fulcrum.

Abstract: A centrifugal exercise device for performing rotator cuff exercises. The device comprises a hand grip, a freely rotating pivot shaft extending from the upper end of the grip, and a flexible, semi-rigid cable extending through an intermediate portion of the pivot shaft at a location spaced longitudinally from the upper end of the grip. A shorter inner terminal portion of the cable extends from one side of the pivot shaft, while a longer weighted portion of the cable extends from the other side of the pivot shaft with a weighted member secured to its end.

Abstract: A lever arm and method of use are disclosed herein. An example lever arm includes a translatable positioning assembly having a handle assembly having a trigger lock, the handle assembly being configured to engage with a frame member of a rack in such a way that the handle assembly can be selectively positioned along the frame member. The trigger lock is configured to engage with one of a first plurality of apertures of the frame member when a desired position for the translatable positioning assembly is selected. An armature that is pivotably coupled to the handle assembly in such a way that the armature can pivot in a first plane. The armature is configured to pivot in a second plane. The lever arm includes a first guide that is rotatably coupled to an end of the armature to allow the first guide to swivel.

Abstract: An exercise device comprising a first strap, a second strap, a buckle, and at least one section of padding coupled to an interior surface of the buckle. The first strap has a first end and a second end, and the buckle is fixedly coupled to the first end of the first strap and configured to receive and retain the second of the first strap. The buckle has a base coupled to the first end of the first strap and a handle portion movably coupled to the base by a pin. The second strap has a first end and a second end, wherein the second strap is fixedly coupled to the first strap, the first and second ends of the second strap having hook and loop fasteners coupled thereto and are configured to removably couple to each other. The second strap is configured to grip and retain at least one weight.

Abstract: The present disclosure relates to a suspended body weight trainer that provides adjustability, is capable of withstanding significant forces, and is robust and resistant to wear and tear. More specifically, the disclosed suspended body weight trainer can be adjustable as to: different strap lengths, so that the grips may be adjusted as desired, based upon user height or exercise being performed; how the grips operate; and the different kinds of grips (or other user-interface devices such as, for example, handles, straps (to create a foot loop), balls, bars etc.) that can be used. In aspects of the disclosure, methods of mounting the straps of the suspended body weight trainer to an anchor providing improved usability and wear resistance thereof are also disclosed.

Abstract: A rigid adapter for use with a barbell and one or more linkages that each have a first end and a second end, such as chains, elastomeric straps, safety looped nylon straps, or the like. The adapter includes a split collar that has an aperture therethrough adapted to receive the barbell, and two halves that each have a threaded aperture. One or more connection bolts are adapted to engage the threaded aperture of one of the halves of the split collar and include a linkage connection adapted for connecting with one of the linkages. Such a connection bolt may be an eye bolt, a J-shaped hook, a rectangular shaped hook, or the like. A resistance band buckle is fixed with the split collar and terminate at a resistance band connector. A spin collar can be used to allow the split collar to rotate on the barbell.

Abstract: The present invention relates to a novel fitness weight device designed to allow users to customize dumbbell weights by filling the air chambers with air. The device comprises a dumbbell-styled weight with an inflatable air chamber. The devices can be inflated via a push button. Users can inflate the dumbbell devices to a desired weight for customized workouts. Once finished, the user can activate the air release valve to compact or retract the dumbbell for storage.

Abstract: A rope pull training device is disclosed, which includes a mainframe having a vertical post, two laterally opposite hauling ropes respectively configured on the mainframe, a resisting unit connected to the mainframe to provide a resisting force against the pulling force applied on the hauling ropes, and a guiding structure fitted on the vertical post, capable of sliding up and down along the vertical post. Each of the hauling ropes is respectively connected to the guiding structure, and each of the hauling ropes respectively goes through the guiding structure. One end of the hauling rope close to the guiding structure is connected with a handle. The hauling ropes are in a cyclic form. The hauling ropes can maintain a tightened state, and can be applied in different exercising modes.

Abstract: An exercise device includes a resistance unit having a connecting gear. It further includes a cable. It further includes an arm that routes the cable to an actuator. The arm is rotatable relative to the resistance unit about the connecting gear, the arm having a central axis. The arm includes a control that mechanically disengages a locking mechanism from the connecting gear. The control is activated by an activation force substantially directed either toward the central axis of the arm, along a length of the arm, or about the central axis. The activation force is mechanically converted into linear force along the arm that disengages the locking mechanism from the connecting gear.