Abstract: A robotic surgical system includes at least one robotic arm comprising at least one movable joint and an actuator configured to drive the at least one movable joint, and a controller configured to generate a first signal, the first signal comprising a first oscillating waveform having a first frequency and being modulated by a second oscillating waveform having a second frequency, wherein the second frequency is higher than the first frequency. The actuator is configured to drive the at least one movable joint based on the first signal to at least partially compensate for friction in the at least one movable joint.

Abstract: A robotic surgical system includes a robotic manipulator that includes a mounting fixture defining a longitudinal channel, and a surgical tool removably coupleable to the mounting fixture. The surgical tool including a tool housing matable with the mounting fixture, an elongate shaft extending from the tool housing and receivable within the channel, and a latching mechanism provided on the elongate shaft and comprising one or more retention tabs biased radially outward with one or more biasing members. The one or more retention tabs are movable between a deployed state, where the one or more retention tabs protrude radially outward through a corresponding one or more slots to engage the mounting fixture, and a retracted state, where the one or more retention tabs are urged radially inward through the one or more slots to disengage the mounting fixture.

Abstract: Enabling third-party application execution on robotic surgical systems are disclosed.

Abstract: An apparatus for use during robotic surgery, where the apparatus includes a robotic arm; a tool driver connected to the robotic arm; a cannula including a proximal portion and a distal portion wherein the proximal portion is coupled to the tool driver; and a damping element connected to one of the robotic arm, the tool driver and the cannula. Also, a method including guiding a surgical tool coupled to a robotic arm into a patient, wherein the surgical tool is disposed through a cannula and coupled to a tool driver coupled to a distal portion of the robotic arm; and maneuvering the tool driver by way of the robotic arm, wherein vibrations generated by the maneuvering are inhibited by a damping element coupled to one of the robotic arm, the tool driver and the cannula.

Abstract: A slave-side propelling device for an interventional surgical robot and a controlling method for the device are provided. The rubbing part, the clamping part, the catheter rotating part and the moving stepping motor part are installed and fixed on the housing. The transmission part is configured to transmit the torque of the moving stepping motor part to the sliding part and the pushing part. The sliding part is configured to drive the guide wire to reciprocate. The pushing part and the clamping part cooperate to clamp or loosen the guide wire. The rubbing part is configured to drive the guide wire to rotate. The catheter rotating part is configured to clamp the catheter and push the catheter into or withdraw the catheter out of the blood vessel.

Abstract: Systems and methods for an effective solution to MR safe actuation in all MRI-guided (robot-assisted) procedures are provided. The present integrated hydraulic transmission method or system uses piston-based cylinders (101,102,201,308(C1), 309(C2), 310(C3), 402, 501) to provide continuous bi-lateral rotation with unlimited range in an MRI environment. Positional and torque control can also be achieved.

Abstract: A surgical tool includes a drive housing having an input shaft arranged therein for rotation, a shaft extending from the drive housing and having an end effector arranged at a distal end thereof, and a drive cable extending within the shaft and operatively coupled to the end effector. A cable band is coupled to the input shaft and operatively couples the input shaft to the drive cable, and an idler pulley is rotatably mounted within the drive housing, the cable band being routed at least partially around the idler pulley. Rotation of the input shaft moves the cable band and thereby controls longitudinal movement of the drive cable to articulate the end effector.

Abstract: Certain aspects relate to systems and techniques for an articulating monopolar medical instrument. In one aspect, the medical instrument includes a wrist comprising a proximal clevis and a distal clevis; an end effector coupled to the distal clevis via a distal axle; at least one proximal pulley in the proximal clevis; at least one distal pulley in the distal clevis and coupled to the distal axle; a first cable configured to engage with the at least one proximal pulley and the at least one distal pulley; and a second cable configured to engage with the at least one proximal pulley without engaging the at least one distal pulley.

Abstract: A catheter organizer for organizing one or more catheters during a surgical procedure includes a drape and a plurality of clips tethered to the drape in an arrayed pattern. The clips are arranged to receive the one or more catheters such that the catheters move longitudinally and rotate within said each clip. Each clips has movable members for reversibly changing the clip from an open configuration to a closed configuration by manipulation of the movable members.

Abstract: A dual access catheterization sleeve includes a first panel and a second panel attached to each other along sides thereof and at one end, wherein a closed distal end and an open proximal end are formed, a first access fenestration formed through the first panel at a location in a center portion of the sleeve between the proximal and distal ends; and a second access fenestration formed through the first panel at a location between the first access fenestration and the closed distal end. The sleeve is dimensioned to cover a hand and at least a portion of an arm of a patient.

Abstract: A carrier element for supporting at least one medical or dental instrument in a cleaning or care device, wherein the instrument comprises a first transmitting and receiving unit for wireless transmission of electromagnetic radiation having data and/or energy with a second transmitting and receiving unit. A coupling antenna is provided on the carrier element, which receives and in turn emits the electromagnetic radiation wirelessly transmitted between the first and second transmitting and receiving units in order to support the wireless transmission of the electromagnetic radiation between the first transmitting and receiving unit and the second transmitting and receiving unit. A method for wireless transmission of electromagnetic radiation with a corresponding carrier element is also described.

Abstract: The arrangement is suitable in that sections of an object may be received in the rod recesses and clamped in a clamping position without a clamping position of the link lever, set by a user, being able to pass into a non-clamping position, in particular automatically. Sie betrifft ferner eine chirurgische Vorrichtung, welche eine solche Schnellspannvorrichtung aufweist. It also relates to a surgical device which comprises such a fast-action clamping device.

Abstract: A surgical light for illuminating a target with light that has a reduced contribution of a portion of the visible spectrum includes a first light source configured to emit light having a first spectrum; a second light source configured to emit light having a second spectrum that does not include the portion of the visible spectrum; and a controller configured to simultaneously activate the first and second light sources for illuminating the target with light that has a reduced contribution of light in the portion of the visible spectrum relative to white light.

Abstract: A method for calibrating an optical axis of a camera mounted to a movable structure is disclosed. The method includes: for each of two or more standoff distances for the camera: capture, using the camera, image data of a target marker while the movable structure is undergoing rotation about a fixed axis, the target marker being a grid of squares each including unique detectable features; determine a respective center of rotation based on the captured image data; determine a first axis which goes through the centers of rotation; and determine a transform between the first axis and a second axis through the center of output image of the camera.

Abstract: A system and method for a teleoperational medical system is provided is provided that can include one or more processors, conductors can extend through a shaft with an interface positioned at a proximal end of the shaft and a sensor(s) positioned at a distal end of the shaft, and the conductors can electrically couple the sensor(s) to the processor via the interface. Signals can be transmitted over the conductors between the sensor(s) and the processor(s). The signals can include power and control signals transmitted in one direction over the conductors and sensor data transmitted in an opposite direction over the same conductors.

Abstract: An instrument holder assembly for use with a robotic surgical system can comprise one or more modules for holding or guiding an instrument. Each module can comprise a variable diameter jaw having movable teeth configured to hold or guide different sized instruments. Each module can be attached to opposite ends of a main shaft that can couple to an arm of the robotic surgical system. A central passage can extend through each module and the main shaft and the variable diameter jaws can constrict the central passage. Teeth of the variable diameter jaws can be biased to a closed or opened position. A tensioner tool can be used to hold biasing elements in position so that the teeth can be loaded into the module. The teeth can be loaded into slots of the module using a tooth holder device.

Abstract: An adapter for a robotic surgical tool autowasher system includes a frame matable with a drive housing of the robotic surgical tool, a shoulder defined on the frame and at least partially circumscribing a basin defined in the frame, and one or more fluid apertures defined in the basin and extending through the frame from a top surface to a bottom surface. One or more alignment features protrude from the frame and are arranged to align with and extend into a corresponding one or more apertures defined in a bottom of the drive housing. At least one of the one or more alignment features only partially plugs an associated aperture of the corresponding one or more apertures.

Abstract: Ablation probe tips (108, 148, 320, 360) and physical and virtual stents (110) for use in tooth bud ablation procedures that result in tooth agenesis as well as tooth bud ablation methods are described herein.

Abstract: An orthodontic appliance and associated systems and methods are disclosed herein. In some embodiments, the appliance comprises an anchor configured to be positioned adjacent a patient's teeth, and an arm extending away from and coupled to the anchor. The arm can include a first end portion at the anchor and a second end portion configured to be coupled to a securing member adhered to a tooth of the patient. The second end portion can include a first region and a second region extending from the first region at an angle. When the appliance is positioned adjacent the patient's teeth and secured to the securing member, the first and second regions may inhibit the second end portion from translating and/or rotating relative to the securing member.

Abstract: Dental apparatus, systems, and methods for providing anterior, lateral, and vertical movement, an apparatus including a posterior portion to be affixed to and supported by a posterior dental structure of a patient; and an anterior portion connected to and separable from the posterior portion, the anterior portion operable to provide anterior movement, lateral movement, and vertical movement to an anterior dental structure of the patient.

Abstract: An orthodontic appliance and associated systems and methods are disclosed herein. In some embodiments, the present technology includes a positioning member configured to position an orthodontic appliance during installation in the patient's mouth. The positioning member may comprise a first portion configured to be coupled to the patient's teeth and a second portion extending away from the first portion. The second portion may be configured to be detachably coupled to the orthodontic appliance. While the positioning member is coupled to the orthodontic appliance, the positioning member is configured to be positioned in the patient's mouth and coupled to the patient's teeth, thereby positioning the orthodontic appliance at a desired location adjacent a patient's oral anatomy.

Abstract: A support system for the manufacture of dental restorations comprises a measuring device which acquires the restoration tooth data of a dental restoration. The restoration tooth data acquired are transmitted to a data processing device connected with a measuring device. The data processing device comprises an analysis module that compares the restoration tooth data with previously determined target tooth data, i.e. patient tooth data. A display device that displays the comparison result is integrated in the data processing device.

Abstract: Method for evaluating a dental situation of a patient. The method having the following successive steps: 1) generating an initial model of at least one dental arch of the patient, preferably by means of a scanner; 2) splitting the initial model in order to define a tooth model for at least some of the teeth represented on the initial model and thereby to obtain a split model; 3) determining an initial support curve of the tooth models in the split model; 4) fixing each tooth model virtually on the initial support curve, preferably by computer; 5) modifying the split model by deformation of the initial support curve according to a deformed support curve, so as to obtain a first deformed model, in which the tooth models are aligned according to the deformed support curve; 6) presenting the first deformed model.

Abstract: An apparatus includes a toothbrush head configured to brush teeth, an appliance brush configured to brush a dental appliance, and a body configured to be releasably coupled with either one of the toothbrush head and the appliance brush such that the appliance brush and the toothbrush head are interchangeable. The body includes a vibration component configured to vibrate the toothbrush head or the appliance brush head when coupled with the body. When the appliance brush is coupled with the body, a greater portion of the body is exposed than when the toothbrush head is coupled with the body.

Abstract: Apparatus and methods are provided to position a device at adjacent tissues near a urethra to overcome the problem of urine leakage during physical movement or activity by changing a contour of a urethra. The devices may include mechanisms such as an inflatable pouch or a pillow anchored to the adjacent tissues of a urethra by an anchoring hook. The inflation of the pouch by an external fluid flexes the pouch towards a urethra and changes the contour of the urethra. The devices may also or alternatively include one or more tissue grasping T-fasteners having forward-facing and reverse-facing barbs to anchor the tissues adjacent to a urethra and bend the contour of the urethra. The device may also include actuators, clips or spring jacks having inflatable bands. The device may include a cap, one-way valves and a combination of a plug and cap to block urethral ostium to temporarily block urine flow from a bladder.

Abstract: The disclosure provides example apparatus and methods. One example apparatus includes a first woven stent having a curved form in an expanded state. In the expanded state, at least a first portion of the first woven stent has a weave pattern arranged along an outer curvature of the first woven stent that is different than a weave pattern arranged along an inner curvature of the first woven stent. And the first woven stent is biased toward the curved form due to shape memory.

Abstract: A tubular woven fabric is useful as a transport hose for a fluid or a powder, as a protective hose for linear bodies such as wires, cables and conduits, as a tubular filter, or as a base material of a vascular prosthesis. The tubular woven fabric includes warp yarns and weft yarns interwoven with each other, the tubular woven fabric having an outer diameter with a variation of within 10% along the warp direction and satisfying the formula: (L2?L1)/L1?0.1.

Abstract: A woven prosthesis, such as a woven vascular graft, woven from warp and weft yarns. Velour warp yarns forming the prosthesis are selectively incorporated into a base layer of the prosthesis so as to provide a bulbous section without compromising the porosity of the prosthesis.

Abstract: Systems and methods for preparing a tissue repair construct for a ligament reconstruction procedure using a reinforced whip-stitching are provided. The described techniques include passing a needle having suture tails attached thereto through a first surface of a graft at an origin point so that a portion of the suture tails exits on a second, opposite surface of the graft while a terminal length of the suture tails is maintained on the first surface of the graft. Multiple suture loops are formed by repeatedly passing the needle with the suture tails around opposite sides of the graft and through the first surface of the graft at subsequent entry points spaced apart along a length of the graft. Each loop is formed so that the construct is reinforced by having a terminal length of each of the suture tails disposed between the first surface of the graft and the loop.

Abstract: Systems, methods, and devices for inserting an intraocular lens (IOL) assembly into an eye may be provided. An apparatus for delivery of a lens component into an eye may include a housing. The apparatus may further include a plunger at least partially disposed in the housing, wherein the housing comprises an elongated portion and a viscoelastic soft tip at a distal end of the elongated portion, wherein the viscoelastic soft tip has a storage modulus of about 1 megapascal (MPa) to about 300 MPa and a loss module of about 1 MPa to about 300 MPa. The apparatus may further include a drive mechanism operatively coupled to plunger and configured to cause the plunger to translate in the housing. The apparatus may further include a nozzle operatively coupled to the housing through which the plunger delivers the lens component into the eye.

Abstract: Systems and methods usable in delivering a docking device to a native valve of a patient's heart. A distal region of a delivery catheter can be positioned in an atrium of the heart and a distal tip can be positioned at or near a commissure of the native valve. The docking device can be located within the delivery catheter. A pusher, such as a pusher wire or tube, of a pusher tool can be advanced distally through the delivery catheter, wherein the pusher can push the docking device along within the delivery catheter. The docking device can be connected to the pusher tool by a line, such as a suture. A member of the pusher tool can be rotatable to change the amount of the suture extending from the pusher tool.

Abstract: A collapsible and expandable stent body includes a generally tubular annulus section, one or more prosthetic valve elements mounted to the stent body, and a cuff attached to the stent body. The prosthetic valve is operative to allow flow in an antegrade direction but to substantially block flow in a retrograde direction. The prosthetic heart valve may include paravalvular leak mitigation features in the form of first and second sealing members. The sealing members are attached to the cuff and extend circumferentially around an abluminal surface of the stent body. The sealing members each have an open side facing in a first axial direction and a closed side facing in an opposite second axial direction. Flow of blood in the second axial direction will tend to force blood into the sealing members and cause the sealing members to billow outwardly relative to the stent body, helping to mitigate paravalvular leak.

Abstract: The present technology is a prosthetic heart valve device, and related systems and methods, for treating a native valve of a human heart having a native annulus and native leaflets. One embodiment comprises a valve support, a prosthetic valve assembly within the valve support, and an anchoring member. The device further includes an extension member coupled to the anchoring member and having an annular first portion coupled to the anchoring member and a second portion coupled to the first portion. The extension member is folded in a delivery configuration such that the first portion overlaps the second portion. When released from the a delivery catheter, the extension member unfolds such that the first portion extends radially outwardly from the anchoring member and the second portion extends radially outwardly from the first portion.

Abstract: A prosthetic heart valve for functionally replacing a previously implanted prosthetic heart valve is disclosed. The prosthetic heart valve includes a collapsible support structure with leaflets and anchors mounted to the support structure. The support structure also includes an inflow end and an outflow end. The anchors include a radially outwardly extending first anchor proximate to the inflow end and a radially outwardly extending second anchor proximate to the outflow end. The first anchor includes a first configuration and the second anchor includes a second configuration where the first configuration is different than the second configuration. The previously implanted prosthetic heart valve serves as a platform for securement of the prosthetic heart valve to the patient's native tissue.

Abstract: An actuator sleeve includes resiliency features that may reduce chronic strain on valve annulus implants. The resiliency features may relate to one or more of a material, a manufacture, a dimension, and/or design attribute of the sleeve. In one aspect the resiliency features may allow deformation of the sleeve at frame interfaces to distribute forces to reduce the frame fatigue.

Abstract: The present disclosure relates generally to the field of medical devices for clamping a leaflet of a heart valve. In particular, the present disclosure relates to medical devices, systems, and methods for delivering artificial chordae tendineae in a patient. In an embodiment, a system may include a clamp having a plurality of arms at a first end. The plurality of arms may have a closed configuration in which the arms are oriented toward each other, and an open configuration in which the arms are oriented away from each other. A spring portion may be coupled to the plurality of arms at a second end that is configured to bias the arms to the closed configuration. The arms of the clamp may be configured to fixedly engage with a leaflet of the heart valve. The second end of the clamp may be configured to couple to an artificial chordae tendineae.

Abstract: A sutureless implant for replacing damaged natural chordae tendineae of a human or possibly animal heart, the implant including a distal implant part, a proximal implant part, and an artificial chord. The distal implant part is configured to fit in a lumen of an implant delivery device and includes a self-spreading portion spreading radially outside when the distal implant part is released from the lumen, the self-spreading portion being capable of anchoring the distal implant part in human muscle tissue. The proximal implant part is configured to fit in the lumen of the implant delivery device and comprises a self-spreading portion spreading radially outside when the proximal implant part is released from the lumen, the self-spreading portion being capable of bearing on a tissue portion of leaflet tissue. The distal implant part and the proximal implant part are connected by the chord.

Abstract: A method of designing a set of contoured implants for fixation to a bone of a patient, includes obtaining a set of virtual bone models of the bone, selecting a plurality of points on an outer surface of each virtual bone model in the set of virtual bone models, manufacturing a set of implants, each implant corresponding to a respective virtual bone model and having fixation holes corresponding to the selected plurality of points on the outer surface of the respective virtual bone model, contouring each implant in the set of implants and selecting a contoured implant from the set of implants for fixation to the bone of the patient such that the selected contoured implant corresponds to a size of the bone of the patient.

Abstract: In accordance with the purpose(s) of the present disclosure, as embodied and broadly described herein, embodiments of the present disclosure, in one aspect, relate to TMJ implantation materials and implants (e.g., temporomandibular joint (TMJ) disc), methods of making TMJ implantation materials and implants, methods of forming a TMJ implantation material or an implant, and the like.

Abstract: An orthopedic system includes an augment that includes a proximal surface and a distal surface, a recessed slot extending along the distal surface, and a through-bore extending between the proximal and distal surfaces and intersecting the slot. The system also includes a coupling component that includes a head and a body. The head has an aperture and is configured to be slidingly received by the recessed slot wherein, when the head is received within the recessed slot, the aperture aligns with the through-bore. The system further includes a femoral prosthesis that has an articular side that defines condylar portions and a bone facing side opposite the articular side. The bone facing side defines a coupling bore. The coupling bore is configured to receive the body of the coupling component for connection thereto.

Abstract: An intramedullary stem prosthesis includes a trunnion tapered in a first direction toward a proximal end of the intramedullary stem, and a conical shaft interfacing with the trunnion at a modular taper junction. The conical shaft is tapered in a second direction toward a distal end of the second component and has a proximal portion, a distal portion, and flutes positioned about a longitudinal axis of the conical shaft and extending along an entire length of the conical shaft and terminating at the modular taper junction such that the flutes intersect the modular taper junction. The proximal portion defines a first taper angle, the distal portion defines a second taper angle greater than the first taper angle, and the flutes define a major diameter of the conical shaft. The major diameter tapers at a major diameter taper angle that is constant along the entire length of the conical shaft.

Abstract: This invention corresponds to a prosthesis for total or hip resurfacing replacement, which comprises a prosthetic femoral head made of highly cross-linked polyethylene, with a diameter ranging from 38 mm to 64 mm, to articulate with a cup or acetabular component made of metal. When the invention applies to total hip replacement, the polyethylene head includes a metal core, which contains inside the female counterpart (14) to mate with the male counterpart (13) of a Morse taper, located at the upper end of the femoral component. The use of this type of head for total hip replacement, articulated with an ultra-polished acetabular cup, reduces the risk of dislocation, transmits less angular and torque forces to the Morse taper than large metal heads, and avoids the problems related to the metal-metal bearing or with the use of large metal heads with thin polyethylene.

Abstract: This is an application for a patent filing of an original type of articulating prosthetic human elbow joints, with replaceable parts. Intramedullary nails located on the base of each joint is used to secure the joint in bones of the humerus and ulna. The intramedullary nail has small pimples in it like a golf ball that allows bone cells to granulate in and attach themselves permanently to the intramedullary nail. This configuration requires only a small amount of adhesive for fixation until the bone cells granulate into the intramedullary nail for a firm permanent attachment. The joint is equipped with humeral and ulnar pieces that contain the articulating surfaces for the joint. The articulating surfaces are replaceable, this and designed to take the bulk of the load. This is done so that the articulating services will break instead of the bones fracturing when too much of a load is applied to the prosthetic.

Abstract: A joint prosthesis system includes a femoral component that has an articular side, a bone facing side, and medial and lateral condylar portions. The medial and lateral condylar portions at least partially define an intercondylar recess located therebetween and have a first concave surface extending in a mediolateral direction across the medial and lateral condylar portions. A first modular component has a second concave surface and is connectable to the femoral component such that, when the first modular component is connected to the femoral component, the first and second concave surfaces come together to form a transverse opening extending in the mediolateral direction. A first tibial assembly has a baseplate component and a head extending therefrom. The head defines an axle opening that extends therethrough. An axle is configured to be received within the transverse opening and axle opening so as to connect the tibial assembly to the femoral component.

Abstract: A base member of a prosthetic stemless shoulder implant may include a proximal collar, a central anchor, and at least one peripheral anchor. The proximal collar may have a proximal surface and a distal bone-engaging surface opposite the proximal surface. The central anchor may extend distally from the bone-engaging surface and define an opening extending from the bone-engaging surface into the central anchor for receiving a humeral head component of the prosthetic stemless shoulder implant. The at least one peripheral anchor may be positioned radially outwardly of the central anchor and extend distally from the bone-engaging surface. The peripheral anchor may be frangibly connected to the proximal collar.

Abstract: Shoulder joint implants are disclosed herein for use in shoulder reconstruction that are configured to facilitate the inclusion a central bone screw for augmented bone fixation. The implant can include a baseplate (or metaglene) configured to secure a glenosphere or other prosthetic component to the glenoid. To facilitate lateral or proximal insertion of a central bone screw through the implant, a throughbore defined along the central axis of the metaglene can be widened to accommodate the maximum diameter of the screw. To enable fixation of the glenosphere to the metaglene, a collet can be configured to engage the smaller diameter of a glenosphere coupling element and inserted into the central throughbore. The collet and the bone screw can be separate parts, thereby making insertion of the bone screw optional. Alternatively, the collet and bone screw can be integrated together to form a unitary construct.

Abstract: A glenoid implant may include an articulating surface, a bone contacting surface opposite the articulating surface, and at least one anchor. The bone contacting surface may include a first portion with a first convexity configured to contact a first portion of the glenoid and a second portion with a second convexity configured to contact a second portion of the glenoid. The first convexity may be different than the second convexity. The implant may include a bearing component defining the articulating surface and an augment component defining at least a portion of the bone contacting surface. Anchors or protrusions may extend from the bone contacting surface. The anchors may include a substantially planar surface.

Abstract: Improved bone plate systems are described herein. In some instances, a bone plate system can include a base plate, at least one retainer plate, and at least one spacer. The at least one retainer plate is configured to reside on the base plate in a free floating manner and can receive at least one fastener to secure the retainer plate to the at least one spacer, thereby providing a plate system that attaches to a spacer. In other instances, a bone plate system can include a base plate having one or more push plates that can engage at least one spacer.

Abstract: The present invention provides an expandable fusion device capable of being installed inside an intervertebral disc space to maintain normal disc spacing and restore spinal stability, thereby facilitating an intervertebral fusion. In one embodiment, the fusion device includes a body portion, a first endplate, and a second endplate, the first and second endplates capable of being moved in a direction away from the body portion into an expanded configuration or capable of being moved towards the body portion into an unexpanded configuration. The fusion device is capable of being deployed and installed in both configurations.

Abstract: The present invention provides a vertebral implant cage for oblique lumbar interbody fusion surgery, comprising: a first member (110) to be inserted between vertebral bodies; a second member (120) coupled to a front surface of the first member; a screw hole (125) formed through the second member; a screw (130) fastened to the screw hole; and a vertical coupling hole (115) vertically formed through the first member so as to couple the second member thereto, wherein the second member can slide a predetermined distance along the front circumference of the first member while being coupled to the vertical coupling hole.