27 results about "Bone drilling" patented technology

The embodiment of the invention provides an intelligent bone drilling self-adaptive control method for a mechanical arm, which comprises the following steps: acquiring displacement deviation of the tail end of a drill bit of an orthopedic surgical robot, obtaining an error change rate through differential calculation, and combining a bone layer type as an input variable of a fuzzy controller and a feeding speed as an output variable; input variables are fuzzified through a membership function, and a fuzzy language variable set is obtained; according to the set and a preset rule base, constructing a multi-rule group structure comprising three types of scenes of free space, cancellous bone and cortical bone, and setting corresponding fuzzy rule subsets for different bone layers; designing a ''minimum-maximum'' rule activation and combination strategy for reasoning by adopting a Mamdani type fuzzy reasoning method according to fuzzification input and a multi-rule group structure, and generating a fuzzification output variable set; and defuzzification is performed through a gravity center method to obtain a continuous speed instruction, and dynamic regulation and control of the drill bit feeding speed are achieved. When approaching a penetration point, the device automatically decelerates and safely stops, so that the safety and accuracy of an operation are effectively guaranteed, and over-drilling injury is prevented.

The application discloses a bone drilling force prediction method based on CT and drilling working conditions, which comprises the following steps: step 1, extracting the contact surface image sequence of the drill bit and the bone tissue on the bone drilling path from the CT image and performing pretreatment; step 2, inputting the pretreated contact surface image and the drilling working condition parameters into a multi-physical factor fusion module to obtain an image sequence of the fused working condition physical information; step 3, inputting the image of the fused working condition physical information into an image coding network to extract the drilling force features in the section; and step 4, inputting the sequence composed of the drilling force features of all sections on the drilling path into a sequence regression network ATP-UNeXt to obtain the prediction of the drill bit stress sequence on the drilling path. The application has the advantages that the drilling force related physical factors can be comprehensively considered, more accurate preoperative stress prediction can be provided, the model reasoning speed is fast, the application is suitable for a clinical operation auxiliary system, and the cost of the operation auxiliary system is reduced.

The utility model discloses a reverse drilling device for ligament reconstruction and repair operation, which relates to the field of medical auxiliary instruments and comprises a handheld component, a drilling component, a drilling component and a drilling component. The bone drilling assembly comprises a connecting shaft, a connecting frame, an adjusting assembly, a rotating shaft, a push rod, a connecting rod and a drill bit; wherein the two ends of the rotating shaft penetrate through the connecting frame and extend into the sliding grooves, the adjusting assembly is arranged in the connecting frame and fixedly connected with the rotating shaft, the connecting shaft is inserted into the front end of the handheld assembly and connected with the connecting frame, and the push rod is inserted into the rear end of the handheld assembly in a sliding mode and connected with the adjusting wheel. The bone drilling assembly is divided into three parts which are installed at the front end, the inner portion and the rear end of the handheld assembly respectively, the rotating shaft drives the push rod arranged behind the handheld assembly to slide and stretch out and draw back through the connecting frame, the drill bit is made to be away from the cross section of the bone, the drill bit recycling space is reserved, and secondary damage to the bone due to drill bit recycling is prevented.

This invention relates to the field of bone drilling training simulation equipment, and more particularly to an operational simulation device for training orthopedic bone drilling skills. The device includes a housing, with modules on both sides of the upper part of the housing. A mold cavity is located in the middle of the side of each module that is close to the other. Rotary seats are located at the front and rear of each module. An electric push rod is mounted in the middle of each rotary seat. A bone body is held between the telescopic ends of the electric push rod, and the bone body is positioned inside the mold cavity. A driven gear is mounted at the opposite end of each rotary seat. A connecting seat is mounted in the middle of the opposite end of each module. Mounting frames are mounted on both sides of the opposite end of each module. Scissor frames are located on both sides of the upper part of the housing, and connecting blocks are rotatably connected to the ends of each scissor frame. This invention can simulate the opening requirements of low-invasive surgery in different locations, solving the shortcomings of traditional equipment with fixed openings that cannot adapt to diverse training scenarios.

The application relates to the technical field of medical devices, and provides an arc-shaped channel drilling system and a robot for orthopedic surgery. The arc-shaped channel drilling system comprises a base used for being connected with the end of a mechanical arm; a position navigator connected with the base and used for determining the position in space; a pressing plate assembly arranged on one side of the base; an arc-shaped bone drilling rod in sliding connection with the pressing plate assembly; the arc-shaped bone drilling rod has a channel in the inside; a flexible shaft arranged in the channel; one end of the flexible shaft is connected with a power device; and a drill bit arranged at the other end of the flexible shaft and in rotary connection with the arc-shaped bone drilling rod. The base is connected with the end of the mechanical arm, the position navigator determines the position of the whole drilling system in space, the flexible shaft is arranged in the channel in the arc-shaped bone drilling rod, the power device provides power for the flexible shaft, the flexible shaft drives the drill bit to rotate, drilling is realized, drilling along the curvature of the arc-shaped bone drilling rod is realized, and the drilling of the arc-shaped channel in hard bone can be completed.

The application provides a kind of robot-assisted kirschner wire bone drilling mechanics model construction method, comprising: analyzing the process of robot-assisted kirschner wire bone drilling, obtaining the geometric model of mechanical analysis of robot-assisted kirschner wire bone drilling;According to the geometric model of mechanical analysis, a kind of finite element analysis model of robot-assisted kirschner wire bone drilling is established, the influence law of kirschner wire rotating speed, feed speed, the relative angle between kirschner wire and bone surface on drilling force is obtained;According to the data of mechanical analysis geometric model and finite element model, a kind of mechanical model of robot-assisted kirschner wire placement is established, and the mathematical representation between drilling force and kirschner wire rotating speed, feed speed, the angle between kirschner wire and bone surface is obtained.According to the technical scheme provided by the application, the construction of the mechanical model of robot-assisted kirschner wire bone drilling can be realized.

This disclosure provides a ring-shaped bone drill and a bone drilling method based on the ring-shaped bone drill, which can be applied in the field of medical technology. The ring-shaped bone drill includes a ring-shaped hollow drill rod, an anchoring mechanism, a lifting and pushing mechanism, and a power module; the anchoring mechanism is inserted into the ring-shaped hollow drill rod; the lifting and pushing mechanism includes a pushing component and a clamping component; the pushing component and the handle are slidably assembled; the clamping component is used to fix the anchoring mechanism; the lifting and pushing mechanism is used to lift the anchoring mechanism based on the clamping component and push the ring-shaped hollow drill rod based on the pushing component when a counterforce is applied; the power module is used to provide rotational power for the ring-shaped hollow drill rod. The above-mentioned ring-shaped bone drill can effectively stop drilling based on the drilling completion state during the bone drilling process. In addition, the ring-shaped bone drill itself has a simple structure, small size, and is easy to use, thus optimizing the application effect in the actual bone drilling process.

The invention provides an orthopedic surgical instrument, an orthopedic surgical robot system and a calibration method.The orthopedic surgical instrument comprises an executing mechanism and a guiding instrument, the executing mechanism is provided with a first end and a second end, and the first end of the executing mechanism is connected with a mechanical arm; the guiding instrument is detachably connected to the second end of the executing mechanism, the guiding instrument is provided with a guiding plane and / or a guiding hole, and the guiding plane is used for guiding and limiting the bone saw blade so that the bone saw blade can conduct osteotomy operation while being attached to the guiding plane; the guide hole is used for guiding and limiting the bone drill bit or the grinding workpiece, so that the bone drill bit penetrates through the guide hole in the axial direction and meanwhile bone drilling operation is conducted, or the center shaft of the grinding workpiece penetrates through the guide hole and meanwhile bone grinding operation is conducted. The device can be compatible with bone treatment operations of plane constraint osteotomy, axis constraint drilling and curved surface constraint grinding, reduces and simplifies assembling and disassembling operations and switching of equipment configuration files in an operation, and effectively improves the operation efficiency.

The present invention relates to the field of phantom teaching aids, and in particular to a simulation device for training children's orthopedic bone drilling skills. The device comprises a teaching phantom, wherein a skull is installed on the inner side of the teaching phantom's head, a notch is provided in the middle of the back of the teaching phantom, a spine is provided inside the notch, a mounting frame is installed on the lower inner part of the spine, the front and rear sides of the bottom of the mounting frame are fixedly connected to a fixed bin, the front and rear parts of the mounting frame are provided with through openings, and a shaping belt is passed through the through openings, the front and rear ends of the shaping belt are fixedly connected to a winding roller, the winding roller is installed inside the fixed bin, the middle part of the shaping belt is fixedly connected to a shaping tube, the shaping tube is provided with an electrovariable fluid, the ends of the shaping belt are connected to a power supply, and the power supply is installed inside the fixed bin. The present invention can simulate the breathing of a living body during surgery, thereby simulating the feeling of a real living body and improving people's training effect.

The invention provides a stereotactic surgery system which comprises a processing unit and a mechanical arm, a guider is arranged at the tail end of the mechanical arm, and the processing unit is used for obtaining the direction of a skull surface normal vector corresponding to a preset bone drilling point of a surgery object; the tail end of the mechanical arm is adjusted to the target posture so that the axis of the guider can coincide with the direction of the normal vector of the skull surface; after a bone drill is installed on the guider, responding to a first moving operation of a doctor on the mechanical arm, and controlling the mechanical arm to move based on the target posture, so that the bone drill drills bones on a preset bone drilling point of the surgical object in the direction of the normal vector of the skull surface. Therefore, by adjusting the posture of the tail end of the mechanical arm before bone drilling, the axis of the guider coincides with the normal vector direction of the skull surface, so that the actual bone drilling point slippage caused by an overlarge included angle between the axis of the guider and the normal vector of the skull surface in the bone drilling process is reduced, and the possibility of deviation of subsequent implantation of a microscopic instrument is further reduced; and the clinical precision of a stereotactic operation is improved.

The invention relates to the field of bone drilling training simulation equipment, in particular to an operation simulation device for bone drilling skill training in the orthopedics department, which comprises a box body, modules are arranged on the two sides of the upper part in the box body, mold cavities are formed in the middle parts of the sides close to each other of the modules, and rotating seats are arranged on the front and rear parts of the modules; first electric push rods are installed in the middles of the rotating seats correspondingly, a bone body is clamped between the telescopic ends of the first electric push rods and arranged on the inner side of the mold cavity, driven gears are installed at the ends, away from each other, of the rotating seats correspondingly, and connecting seats are installed in the middles of the ends, away from each other, of the mold blocks correspondingly. Mounting frames are mounted on the two sides of the middles of the ends, away from each other, of the modules, scissor frames are arranged on the two sides of the upper portion in the box body, and connecting blocks are rotationally connected to the ends of the scissor frames, the opening requirements of low-wound surgeries of different parts can be simulated, and the defect that a traditional device is fixed in opening and cannot adapt to multiple training scenes is overcome.

An inner plate line indicating a maximum shaving point when shaving a pelvis to arrange a cup included in an artificial hip joint is displayed in a superimposed manner.SOLUTION: Acquiring, by a computer, a fluoroscopic image of a patient to be subjected to a procedure related to an artificial hip joint, recognizing, in a pelvis of the patient in the acquired fluoroscopic image, an inner plate line indicating a maximum cutting point when cutting the pelvis to arrange a cup included in the artificial hip joint, and recognizing, in the pelvis of the patient, an indispensable line indicating a minimum cutting point when cutting the pelvis to arrange the cup; And deriving a cup CE angle when the cup is assumed to be placed in a state in which the pelvis of the patient has been shaved by the bone drilling reamer used in the treatment related to the artificial hip joint, superimposing and displaying the recognized medial plate line and the requisite line on the fluoroscopic image, and displaying the derived cup CE angle in association with the fluoroscopic image.SELECTED DRAWING: Figure 1

This invention discloses a surgical drilling device, relating to the field of surgical drilling technology. It includes a drilling handpiece with a drilling section for drilling into bone. The handpiece is equipped with a ulceration limiting component to prevent excessive downward pressure. A lifting adapter is mounted on the drilling section, and a propulsion component is mounted on the lifting adapter to limit the drilling depth. By using the propulsion component in conjunction with the lifting adapter, the timing of the elastic retraction of the ulceration limiting component can be controlled. This ensures the surgeon has sufficient downward pressure during the initial bone drilling, guaranteeing drilling efficiency. This addresses the problems of current surgical drilling devices, such as the inconvenience of automatically reducing drilling pressure when approaching bone penetration and the difficulty in preventing damage to the medullary cavity during flushing.

The invention relates to a device and method for automated bone drilling in orthopedic surgery, equipped with a main body with a body (1) configured with a handle (13) and an inner space in which a linear bearing (2) is mounted, in which a hollow cylindrical linear guide (3), in which the first rotary electric motor (4) and second electric motor (6) are mounted, to which the working mechanism equipped with a working tool (5) is fixedly attached, where the second rotary motor (6) is fixedly mounted in the bottom of the housing (1) with an axis parallel to the axis of the linear bearing (2) with a screw (7) and a bracket nut (8) fixedly connected to the hollow cylindrical linear guide (3) or the second rotary motor (6) is fixedly mounted in the upper part inside the handle (13) of the main body (1), in which its axis is crossed with the axis of the linear bearing (2), and a helical gear (14) is mounted on the rotor of the second motor (6) connected to a second helical gear (15) with the screw (7) and a cantilever nut ( 8), fixedly connected to the hollow cylindrical linear guide (3), and the axis of the screw (7), bearing at both ends in the housing (1), is parallel to the axis of the linear bearing (2), where between the cantilever nut ( 8) and the hollow cylindrical linear guide (3) is positioned force sensor (9) located in a housing (10) in which the force sensor (9), piston (11) and adjusting screw (12) are located on one axis, provided with a screw and a lock nut (24), the housing (10) being fixedly connected to the cylindrical linear guide (3) and the piston (11) being fixedly connected to the cantilever nut (8) by means of lock nuts (23), and to the outside at one end of the main body (1) by means of a supporting arm, a non-contact temperature sensor (16) is immovably mounted, and the device is connected through a control system with controllers and power supplies of an interface device (21) to a control, processing and information storage module (22) with the possibility of connecting to a specialized robot. The described device precisely and automatically controls the drilling process with force feedback, hence the significant improvement in the quality of the bone drilling process, guaranteeing no damage to the bone and the area around it.

The utility model provides a bone tissue drilling device which is composed of an outer sleeve drill bit, a built-in drill bit, a drill rod and a clamping head, and the built-in drill bit is arranged inside the outer sleeve drill bit in a sleeved mode. The outer sleeve drill bit is provided with a limiting piece and a sawtooth blade is arranged at the top end of the outer sleeve drill bit, so that the bone tissue cutting range and depth can be locked and the bone tissue can be longitudinally cut; the built-in drill bit is a double-helix drill bit, two same fan-shaped blades are arranged at the top end of the built-in drill bit and can transversely cut and smash the longitudinally cut bone tissue, and a chip groove is formed by the double-helix structure of the built-in drill bit and can discharge the smashed bone tissue through the chip groove. The bone tissue drilling device is simple in structure, smashing and cleaning of bone tissue within a controllable range are achieved, and bone drilling efficiency and accuracy are greatly improved.

The invention discloses self-aiming orthopedic surgery equipment, an orthopedic surgery system and a using method, and relates to the technical field of medical instruments, the self-aiming orthopedic surgery equipment comprises an executing mechanism and a posture adjusting mechanism, and the executing mechanism is used for executing bone drilling operation; the posture adjusting mechanism comprises a base, at least three movement branch chains and a mounting platform, the base is used for being held by an operator or integrated to the surgical robot, the mounting platform is used for mounting the executing mechanism and connected with the base through the movement branch chains, and the movement branch chains can move along a preset track; according to the invention, the structure is simple, the use is convenient, the operation risk is effectively reduced, and the operation efficiency is effectively improved.

The application discloses a self-aiming orthopedic surgery device, an orthopedic surgery system and a use method, relates to the technical field of medical instruments, and comprises an executing mechanism and a posture adjusting mechanism. The executing mechanism is used for executing a bone drilling operation. The posture adjusting mechanism comprises a base, at least three motion branches and a mounting platform. The base is used for being held by an operator or being integrated into a surgical robot. The mounting platform is used for mounting the executing mechanism. The mounting platform is connected with the base through the motion branches. The motion branches can move along preset trajectories to drive the mounting platform and the executing mechanism to realize at least pitch angle adjustment, yaw angle adjustment and linear feeding operation. The application has the advantages of simple structure, convenient use, reduced surgery risk and improved surgery efficiency.

The utility model relates to a low heat accurate reduction bone needle, its main body structure comprises a needle tip part, a needle body and a needle tail part, the needle tip part is provided with a three-blade structure, each blade part is provided with a front knife face, a cutting edge, a first rear knife face and a second rear knife face, a lengthened spiral groove structure is arranged between every two blade parts, the needle body is marked with scale marks, and the needle tail part is provided with a first spiral groove and a second spiral groove. One end of the needle body is connected with the needle tip part, and the other end of the needle body is connected with the needle tail part. Due to the design of the lengthened spiral groove, bone scraps can be completely removed, heat is effectively reduced, and secondary damage caused by too much bone scraps and too high heat is avoided; the scale line design of the needle body assists a doctor in accurately determining the using length and accurately controlling the bone drilling depth in the operation process, and the bone drilling needle has the advantages of being low in heat, high in efficiency, accurate in positioning, accurate in resetting, convenient to operate, capable of preventing osteonecrosis caused by high temperature, avoiding secondary damage to bones caused by the phenomena such as blade breaking and the like and the like.

The present invention discloses a device for detecting the lateral force state of a robot bone drilling tool and a method for using the device. The device includes a linear drive mechanism and a tool rotary motor. The tool rotary motor is driven by the linear drive mechanism. The axis of the drilling tool passes through the measuring shaft of the axial force sensor, the hollow output shaft of the tool rotary motor, and the hollow hole of the axial force sensor in sequence from the back to the front, and the tool rotary motor can drive the drilling tool to rotate. The drilling tool portion passing through the axial force sensor is sleeved with a lateral force transmission mechanism whose tail end is fixed to the axial force sensor. A constraint protrusion is provided on the front inner wall of the lateral force transmission mechanism. When in use, the spatial coordinates of the tool rotary motor on the end of the robotic arm are determined and the tip of the drilling tool is returned to the origin. When performing a bone drilling operation, the tip offset of the drilling tool is automatically calculated. The device of the present invention can help the robot sense the lateral force of the drilling tool and calculate the degree of lateral offset of the drilling path.

The utility model discloses a bone drilling and taking device for orthopedics, which belongs to the technical field of medical instruments and comprises a base and a trephine bone taking device body, the top of the base is fixedly connected with a lifting assembly, the lifting assembly comprises a fixing frame, the fixing frame is fixedly connected to one side of the top of the base, and a threaded rod is rotatably connected in the fixing frame. According to the trephine bone taking device, the trephine bone taking device body is effectively adjusted to a proper height through the height assembly, and secondary positioning is not needed after height positioning, so that the trephine bone taking device body can be maintained at the same height point position, the bone drilling and taking efficiency is improved, the operation is simple, and the operation is convenient. By means of the adjusting assembly, the trephine bone taking device body can effectively position bone drilling and taking point positions with different angles, the trephine bone taking device is suitable for various drilling angles, operation is convenient and fast, use convenience is improved, the bone drilling and taking effect is improved, and potential safety hazards are avoided.

The utility model provides an adjustable bone drilling positioner, which relates to the field of medical instruments, and comprises a drilling positioning guide plate and a bone surface positioning guide pillar arranged on the drilling positioning guide plate, the bone surface positioning guide pillar is matched with a bone surface positioning cone, the bone surface positioning guide pillar is provided with a plurality of through holes matched with the bone surface positioning cone, and the through holes are matched with the bone surface positioning cone. At least one drill hole is formed in the drill hole positioning guide plate, the central axis of the drill hole and the central axis of each through hole are converged at the same point, and the drill hole positioning guide plate is further connected with a handle. Compared with the prior art, according to the adjustable bone drilling positioner, the bone surface positioning guide column is arranged in the drilling positioning guide plate, the bone surface positioning cone is inserted into the through hole in the bone surface positioning guide column for positioning, and then the drill rod is inserted into the drill hole for drilling, so that the adjustable bone drilling positioner is simple in structure, convenient to operate and capable of preventing displacement in the drilling process; the problem that in an existing bone reconstruction operation or ligament reconstruction operation, hole positions may be deviated when holes are punched in a bone is solved.

The utility model relates to the technical field of medical instruments, and discloses an auxiliary bone drilling positioning device for an orthopedic 3D (three-dimensional) operation guide plate, which comprises a base provided with a horizontal mounting surface, and further comprises a placement frame arranged on the mounting surface of the base, and an installation area is arranged between the placement frame and the base; the fixing mechanism is arranged in the mounting area, the fixing mechanism is further provided with a fixing bandage penetrating through the placing frame, and the bone of the patient can be fixed to the placing frame through the fixing mechanism and the fixing bandage; the position adjusting component is arranged on the placing frame, an operation guide plate is further arranged at the moving end of the position adjusting component, and the operation guide plate can be attached to the suitable surface of the bone of the patient under driving of the position adjusting component so as to assist in bone drilling and positioning. The auxiliary bone drilling and positioning device for the orthopedic 3D operation guide plate aims at solving the problems that in the bone drilling and positioning process, accuracy is insufficient, and operation difficulty is large.

Used in orthopedics and other medical fields, for example, it guides the direction of drilling when creating holes in bone. To facilitate understanding of the design's usage, a reference perspective view showing its use in the medical field is attached. Furthermore, a magnified reference perspective view of the tip is attached to clarify its structure. The tip has a first thinning surface and a second thinning surface, with a first cutting edge and a second cutting edge formed at the boundary between these thinning surfaces and a common relief surface. This structure enhances machinability and prevents the tip from slipping on the workpiece surface during drilling. Additionally, two notched planes are formed extending from the tip towards the rear end.

The utility model provides a tooth implantation guide plate which comprises a guide plate body and a guide ring, the guide ring is embedded on the guide plate body, the guide plate body is used for abutting against gingiva, the guide ring is used for being aligned with an implantation area, a flow guide groove is formed in the inner wall face of the guide ring and is of a spiral structure, and a liquid inlet hole and a liquid outlet hole are formed in the guide ring. The liquid inlet hole and the liquid outlet hole communicate with the two ends of the flow guide groove correspondingly, and the flow guide groove is used for guiding cooling liquid entering the liquid inlet hole to the liquid outlet hole to be discharged. According to the cooling device, due to the fact that the flow guide groove is of the spiral structure, after cooling liquid enters the flow guide groove from the liquid inlet hole, the cooling liquid can be guided to flow along the spiral path. By means of the rotating flowing mode, the turbulence degree of the cooling liquid can be increased, so that the mixing performance and flowing uniformity of the cooling liquid are improved, the dead angle and vortex phenomena of the cooling liquid on the guide ring are reduced, and heat generated when a drill bit conducts bone drilling can be effectively taken away.

A system for creating multiple channels in bone and for delivery of graft material, such as in the treatment of bone necrosis, which includes a primary drill having a shaft with a cylindrical side, a proximal end, and a distal end; a flexible drill; and a system for harvesting bone graft for deep bone graft delivery. The primary drill has a first drill bit at the distal end of the shaft; an opening in the cylindrical side of the shaft; and a passage extending from the longitudinal bore in the shaft to the opening in the cylindrical side of the shaft. The flexible drill has a second drill bit configured to enter the longitudinal bore in the shaft of the primary drill so that the second drill bit extends toward the distal end of the shaft and extends from the opening in the cylindrical side of the shaft. A separate system for the harvest and delivery of bone graft is also described, which couples to the primary drill system via a tubular trocar guide, through which both systems function interchangeably allowing sequential drilling and grafting.

The invention relates to the technical field of orthopedic sampling devices, in particular to an adjustable orthopedic sampler which comprises a bone drill and a sampling drill bit and further comprises an adjusting part, a sampling part, a sampling part, a sampling part, a sampling part and a sampling part, and the adjusting part is connected to the bone drill in a sleeving mode and used for adjusting the normal saline spraying position; the output end of the water spraying part is provided with a fixing part and an output part, and the water spraying part is used for spraying normal saline to the sampling area and fixing the device; the adsorption part is arranged on one side of the bone drill and used for adsorbing normal saline and chippings in an operation area; wherein a water spraying point of the water spraying piece is close to the sampling drill bit through the fixing piece, and the adsorption piece is detachably connected with the water spraying piece. A normal saline water spraying point and fixing points are matched together, so that the normal saline water spraying point is closer to a drill bit, the heat dissipation efficiency between the drill bit and a bone is improved, a patient is further protected, meanwhile, the device can be effectively fixed through the arrangement of the multiple fixing points, and the device is more convenient to use. And deviation of the device during use is further avoided.

A bone material removal device including a cannula, a bone drilling forward tip and a bore widening element including a bone carving portion that slides axially relative to the cannula and extends in a circumferential direction and wherein the axial movement of the bore widening element relative to the cannula brings a carving portions to travel and extend radially in a circumferential direction beyond a surface of the cannula and carve bone from a wall of a bore.