A surgical saw

Abstract

A surgical rotary file, the surgical rotary file comprising a prevention device, an attachment device and a working part, the working part comprising at least one working device, the at least one working device for processing a material selected from bone, cartilage, calcified tissue, teeth and foreign objects in a patient 5, wherein the working device is selected from a grinding surface and a flute defining a cutting edge. The prevention device is configured to have a first position and a second position. In the first position, when the force applied to the prevention device is less than a predetermined amount of force, the prevention device at least partially prevents the working device from processing the material. In the second position, when the force applied to the prevention device is equal to or greater than the predetermined amount of force, the prevention device allows the working device to process the material.

Description

[0001] This application is a divisional application of the patent application with application number 201780063112.3, application date October 13, 2017, and invention name “A surgical rotary file”. Technical Field

[0002] The present disclosure relates generally to the processing of materials; more particularly, to a surgical rotary burr. Background Art

[0003] Conventionally, various devices are used for shaping of objects, such as cutting, drilling, milling, sawing, polishing and / or grinding. For example, these devices may include rotary files, drill bits, saw blades and cutting discs. Typically, these devices are used in woodworking, mechanical processing, plastics industry and medical fields. Usually, shaping and processing of objects requires a high degree of control of the handheld device by the operator. In addition, the targeted action of the device is crucial to minimize accidental injuries, especially in medical applications.

[0004] The shaping and treatment of hard tissue in the medical field mainly involves treating the bones or cartilage of patients undergoing surgery. However, soft tissues such as blood vessels or nerves may be located adjacent to the hard tissue being treated, and surgical equipment may cause accidental damage to the patient's soft tissue. For example, surgical equipment may cause damage such as dura mater tear during spinal surgery, facial nerve paralysis during ENT surgery (ear, nose and throat surgery), or lingual nerve paralysis during dental treatment. Subsequently, damage to soft tissue may cause swelling, pain, numbness, bleeding and several other complications. In addition, damage to soft tissue may prolong the patient's recovery period.

[0005] A possible tool for performing surgical treatment is a rotary file. A rotary file generally includes a head formed of a rigid material (typically metal and tungsten carbide). There are typically two types of rotary files, namely cutting rotary files and grinding rotary files. A cutting rotary file has a head that is molded to have a plurality of flutes. The flutes are formed to define a tissue cutting edge, and each flute has a rake face and a clearance surface. The rake face and the clearance surface intersect to form a cutting edge that extends along the length of the flute, as shown in more detail in the accompanying drawings below. In other words, the rake face is the face of the planed material in front of the cutting edge, and the clearance surface is the surface in the rear of the cutting edge, which extends toward the adjacent flutes. A grinding rotary file has a head having a surface that is typically coated with a wear-resistant coating such as a diamond or hard carbon coating.

[0006] In addition, in a rotary file, the shaft extends backward from the head. The free end of the shaft has a feature that facilitates locking the shaft to the motor head. Actuation of the handpiece causes the rotary file to rotate. During surgical treatment, the rotary file head is placed against a surgical site where a portion of tissue is to be removed (i.e., treated). Typically, the rotating cutting edge removes tissue from the surgical site, while the rotary file can also be used to treat foreign bodies such as implants in the body. Rotary files of various shapes and sizes are used in treatments such as orthopedic surgery, neurological and spinal surgery, ear, nose and throat surgery, and other surgical treatments in which the neutron therapy is the selective removal of a portion of tissue.

[0007] In the patent document US 5,876,405 entitled "Perforator", a drill bit is described which has a centrally disposed pointed guide pin to penetrate a material such as a bone structure, while the drill bit is a hollow cylindrical wall with a cutting edge formed at the bottom end of the drill bit to remove / cut bone obstructions after the drilling is completed. Therefore, the document does not provide a method to prevent accidental drilling of a material by the pointed cutting edge of a conventional twist drill bit located at the tip of the drill bit.

[0008] Thus, a rotary file is different from a hollow drill because there is a head in the rotary file that makes the rotary file different from such a hollow drill. A hollow drill has a cutting edge on its bottom side, which is not the case with a rotary file. In a twist drill, the spiral flutes are ground into the body of the shaft, and the flutes at the tip form the cutting edges on the bottom end rather than on the circumference of the drill. In a rotary file, if there are flutes, they form the cutting edges on the circumference of the rotary file head. In addition, the geometry and application of drills and rotary files are basically different. Rotary files are used for milling and grinding, i.e., using a rotating tool to remove material from a workpiece by advancing in any direction (when cutting occurs on the circumference of the rotary file), while drills are used for drilling, i.e., removing material along the axis of rotation of the drill (when drilling occurs at the bottom end of the drill). Another difference is that a rotary file removes material from the material to be processed, rather than making holes in the material like a drill.

[0009] In recent years, progress has been made in improving surgical equipment such as high-speed drills and ultrasonic cutting devices. However, there have been no substantial changes in surgical equipment to minimize accidental damage to surrounding tissue. For example, the risk of damaging soft tissue during the treatment of hard tissue is still prevalent. In addition, ultrasonic cutting devices require the purchase of entirely new equipment and the need to train in a new type of surgical treatment, which is inconvenient for the user.

[0010] Various industrial tools, such as table saws or disc cutters, may present risks to the user, such as the user's fingers or hands. Different means of protection exist, but it may still be beneficial to try to improve these safety devices.

[0011] Therefore, in view of the foregoing discussion, a need exists to overcome the aforementioned deficiencies associated with conventional apparatus for processing objects. Summary of the invention

[0012] The present disclosure seeks to provide a surgical rotary file for processing materials. The present disclosure also seeks to provide a solution to the existing problem of inadvertent damage to soft tissue during the processing of hard tissue. The object of the present disclosure is to further provide a solution that at least partially overcomes the problems encountered in the prior art and to provide a safe, precise and reliable rotary file to achieve better control, better safety and targeted operation of material processing in medical applications. Another object is to reduce the chatter of the rotary file when in use.

[0013] In one aspect, an embodiment of the present disclosure provides a surgical rotary file, the surgical rotary file comprising:

[0014] - prevention devices;

[0015] - attachment means; and

[0016] - a working part comprising at least one working device for processing a material selected from the group consisting of bone, cartilage, calcified tissue, teeth and foreign objects in a patient's body, wherein the working device is selected from the group consisting of an abrasive surface and a flute defining a cutting edge;

[0017] Wherein, the prevention device is constructed to have:

[0018] a first position in which the arresting device is arranged so that when a force is applied to the arresting device

[0019] at least partially preventing the working device from processing material when the force is less than a predetermined amount; and

[0020] - a second position in which the preventing device is arranged to allow the working device to process the material when a force applied to the preventing device is equal to or higher than a predetermined amount of force.

[0021] The embodiments of the present disclosure substantially eliminate or at least partially solve the aforementioned problems in the prior art and are capable of processing materials safely and specifically.

[0022] Further aspects, advantages, features and objects of the present disclosure will become apparent from the accompanying drawings and detailed description of illustrative embodiments, which are interpreted in conjunction with the appended claims.

[0023] It will be appreciated that features of the present disclosure are susceptible to being combined in various combinations without departing from the scope of the present disclosure as defined by the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] When read in conjunction with the accompanying drawings, the above-described summary of the invention and the following detailed description of illustrative embodiments can be better understood. In order to illustrate the present disclosure, exemplary configurations of the present disclosure are shown in the accompanying drawings. However, the present disclosure is not limited to the specific methods and means disclosed herein. In addition, it should be understood by those skilled in the art that the drawings are not drawn to scale. Wherever possible, the same reference numerals are used to refer to similar elements.

[0025] Embodiments of the present disclosure will now be described by way of example only with reference to the following drawings, in which:

[0026] Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 are different views of a surgical rotary file according to an embodiment of the present disclosure;

[0027] Figure 6 yes Figure 5 A cross-sectional view of a surgical rotary file along BB according to an embodiment of the present disclosure;

[0028] Figure 7 yes Figure 6 An enlarged view of a surrounding portion of a surgical rotary file according to an embodiment of the present disclosure;

[0029] Figure 8 , Fig. 9 and Fig.10 yes Figure 5 A cross-sectional view of a surgical rotary file along CC according to various embodiments of the present disclosure;

[0030] Fig.11 is a perspective view of a surgical rotary file according to another embodiment of the present disclosure;

[0031] Fig.12 yes Fig.11 A cross-sectional view of a surgical rotary file along FF according to an embodiment of the present disclosure;

[0032] Fig.13 , Fig.14 , Fig.15 and Fig.16 yes Figure 1 A schematic diagram of a surgical rotary file in use according to an embodiment of the present disclosure;

[0033] Fig.17 , Fig.18 and Fig.19 is a view of a surgical rotary file according to an embodiment of the present disclosure;

[0034] Fig. 20 and Fig.21 is a perspective view of a surgical rotary file according to various embodiments of the present disclosure;

[0035] Fig. 22 and Fig.23 are different views of a surgical rotary file according to an embodiment of the present disclosure;

[0036] Fig.24 and Fig.25 are different views of a twist drill according to an embodiment of the present disclosure;

[0037] Fig.26 is a front view of an oscillating saw blade according to an embodiment of the present disclosure;

[0038] Fig. 27 and Fig.28 are different views of a saw according to an embodiment of the present disclosure; and

[0039] Fig.29 is a cross-sectional view of a circular surgical rotary burr perpendicular to its central axis showing the rake face and clearance surface.

[0040] In the accompanying drawings, underlined numbers are used to indicate the item above which the underlined number is located or to indicate an item adjacent to the underlined number. Non-underlined numbers refer to the item identified by the line connecting the non-underlined number to the item. When a number is not underlined and is accompanied by an associated arrow, the non-underlined number is used to identify the overall item to which the arrow points. DETAILED DESCRIPTION

[0041] The following detailed description sets forth embodiments of the present disclosure and methods that can implement these embodiments. Although some modes of carrying out the present disclosure are disclosed, those skilled in the art will appreciate that there are other embodiments that can be used to carry out or practice the present disclosure.

[0042] In one aspect, an embodiment of the present disclosure provides a surgical rotary file, the surgical rotary file comprising:

[0043] - prevention devices;

[0044] - attachment means; and

[0045] - a working part comprising at least one working device for processing a material selected from the group consisting of bone, cartilage, calcified tissue, teeth and foreign objects in a patient's body, wherein the working device is selected from the group consisting of an abrasive surface and a flute defining a cutting edge;

[0046] Wherein, the prevention device is constructed to have:

[0047] a first position in which the arresting device is arranged so that when a force is applied to the arresting device

[0048] at least partially preventing the working device from processing material when the force is less than a predetermined amount; and

[0049] - a second position in which the preventing device is arranged to allow the working device to process the material when a force applied to the preventing device is equal to or higher than a predetermined amount of force.

[0050] The present disclosure provides a surgical rotary file for processing materials. The main advantage of the device is that when used to process hard tissue, the adjacent soft tissue is protected due to the prevention device. In fact, the device significantly reduces the risk of accidental processing of objects adjacent to the object being processed (such as soft tissue adjacent to the hard tissue being processed (e.g., drilled)). The device also enables the operator to better control the processing of the object. In fact, the prevention device significantly improves the controllability because the prevention device prevents the cutting tool from penetrating into the working material unnecessarily and / or excessively. In other words, the prevention device does not allow the tool to suddenly penetrate into the working material. When the tool suddenly penetrates the working material, the tool begins to vibrate violently (known as chatter), and sometimes the tool loses control (jumps). In addition, the prevention device allows the operator to adjust the cutting depth according to the amount of thrust he / she applies. This improves the accuracy of cutting. As a result, the device achieves accurate processing of the desired part of the object. Therefore, the device related to the medical field provides safer operation and significantly reduces the risk of soft tissue damage during surgery. In addition, the device can process objects in a time-effective manner. In addition, the device can be adapted to the type of treatment required for the object, i.e., it can be adapted to conventional and existing shaping and treatment devices, regardless of the type of device. In fact, "shaping and treatment" in this specification refers to various processing of hard tissues, such as cutting, grinding, milling, drilling, polishing, sawing, etc., and in conjunction with the embodiment of a surgical rotary file, treatment refers to cutting, milling and grinding. Moreover, in this specification, the term "working surface" refers to that part of the working part that actually treats the object, and the working surface can be only a part of the working part, or in some cases the entire working part can be the working surface.

[0051] The present disclosure provides a surgical rotary file that can be made in a variety of different ways, some of which will be explained in more detail below. The main feature of the device is that the prevention device has two different positions (a first position and a second position). In the first position, the prevention device protrudes from the working part to at least partially (preferably completely) prevent the working device from processing the material. The first position is the position occupied by the prevention device when the force applied to the prevention device is less than a predetermined amount of force. This means that the user will need to, for example, press the device against the material to be processed in order to start processing, that is, to overcome the required force limit. The second position of the prevention device is the position where the prevention device is retracted to allow the working device to process the material. When the force applied to the prevention device is equal to or higher than a predetermined amount of force, the position is occupied by the prevention device. Therefore, the predetermined amount of force forms a limit that defines the position of the prevention device. The prevention device can be placed in the first position of the prevention device by an attachment device (for example, by means of an internal component), a centrifugal force or a deformation of an external component (an elastic or flexible moving component). These different embodiments will be explained in more detail below.

[0052] The surgical rotary file includes a prevention device for preventing the working device from processing the material. Therefore, the prevention device is a mechanism that may have one or more parts. For example, the prevention device may include an external moving part and an internal spring (for example, a bent coil spring or an elastomer used as a spring). Alternatively, the prevention device may include a moving part that is an integral part or a separate part, and the moving part has an external part and an internal part (for example, an integrated spring and a ring). Further, the prevention device may include an elastic part attached to the outer surface of the working part, such as a flap or an elastomeric part. In this article, the term "elastic" refers to a part made of a material that can change shape (for example, by bending or compressing under the action of a force (such as pressure), and once the force is no longer applied to the part, it will restore its original shape).

[0053] According to an embodiment, the preventing device is arranged to protrude from the working member in its first position and to be retracted from the working device in its second position.According to another embodiment, the preventing device is arranged to push soft tissue away from the cutting edge in its first position and to allow the working device to contact hard tissue in its second position.

[0054] Therefore, the prevention device is constructed to have two different positions depending on the force applied to the prevention device when the working part interacts with the material to be processed. There are different forms of relevant forces, such as friction, normal force and shear force. The force refers to the normal force applied to the prevention mechanism at the contact point between the outer surface of the prevention device and the material (this is the reaction of the material to the thrust applied by the user and the motor torque). Therefore, this force can be a contact force.

[0055] According to an embodiment, the working part comprises at least one recess into which the preventing device can be retracted, i.e. the at least one recess is used to arrange the preventing device therein. In this embodiment, when the preventing device is in its first position, the preventing device is partially arranged in the recess, and when the preventing device is in its second position, the preventing device is substantially completely arranged in the recess. According to another embodiment, the recess is a slot or a hole on the working part. When the preventing device is arranged at the same level of the working part as the working device, such an embodiment is preferably used so that the preventing device is retracted into the recess to allow the working device to process the object. According to an embodiment, the recess has a V-shaped or stepped profile. The V-shaped means that the width of the bottom of the recess is less than the width of the recess near the surface of the working part. The stepped profile means that the width of the recess is not uniform, on the contrary, the recess has different widths, and the change in width is not continuous but sharp. Such a stepped profile only allows the preventing device to perform limited radial movement (e.g., in the form of a ring or a partial ring) in relation to the working part.

[0056] This specification is primarily directed to a surgical rotary file. However, the same principles are fully applicable to twist drills and saws used in surgery. Therefore, the various embodiments and alternatives described herein are fully applicable to twist drills and saws as described in this specification. Therefore, the term working means of a surgical rotary file is equivalent to the term working surface when using a surgical twist drill and / or surgical saw. Likewise, the terms material and object are interchangeable when it comes to the question of what the described device is intended to treat.

[0057] In other embodiments, for example when using a saw, no recess is needed, since the arresting device can be arranged on top of the working part, such that the arresting device is substantially parallel to the working part. In practice, in this case, the working surface is, for example, the toothed side surface of the saw, and the arresting device is arranged to at least partially cover this surface when the arresting device is in its first position. Here, covering means that the cutting surface (teeth) is not completely visible when the device is viewed from above or from below.

[0058] According to an embodiment, the present specification relates to an apparatus comprising: a prevention device; an attachment device; and a working component, the working component comprising at least one working device (or, at least one working surface) for processing a material (or, an object) and at least one recessed portion for arranging the prevention device therein. The prevention device is configured to protrude from the working component when a force applied to the prevention device is less than a predetermined amount of force, and to retract into the at least one recessed portion when a force applied to the prevention device is equal to or higher than the predetermined amount of force.

[0059] The different parts of the device may be connected to each other in different ways. For example, there may be a protruding part on the inner surface of the arrester, which abuts against the recess and acts as a pivot point. A spring mounted at one end of the arrester applies the required force to cause the arrester to protrude from the recess, thereby providing protection during use of the device.

[0060] According to an embodiment of the present invention, the prevention device may also have more than two positions, namely intermediate positions between the first position and the second position. These intermediate positions (the number of the intermediate positions may be any discrete number, such as one, two, three, four or five) are used to control the depth of cutting. In practice, for example, the first intermediate position allows a depth of 1 μm (micrometer) to be cut per revolution, while the second intermediate position allows a depth of 2 μm to be cut per revolution, and the third intermediate position allows a depth of 3 μm to be cut per revolution. These positions are selected by the user through the force applied to the device and therefore by the force against which the device is pushed against the material during processing, and these positions may be achieved by various technical means (such as springs). Different limiting devices may also be provided in the device, which lock the prevention device to the selected intermediate position and require a slightly larger force to overcome the lock and move to the next position. The device may also be designed in such a way that when the pressure (i.e., the contact force) is released, the prevention device automatically returns to its first position.

[0061] Depending on the flexibility of the preventing device, the retraction into the recess may occur in the form of a deformation of the (flexible) preventing device, a lever-like movement of the (rigid) preventing device, or a combination of deformation and lever-like movement (semi-flexible preventing device). Therefore, when the preventing device is a spring itself or is made of an elastomer, the presence of a spring (as described below in conjunction with one embodiment) may not be crucial. Therefore, the spring can be made of silicone, for example, or the spring can be a bent coil or a wave spring. In addition, the preventing device can be configured to have a hook-shaped form at the end to allow only a limited radial movement of the preventing device relative to the working part.

[0062] The arrester may be made as a single component, or the arrester may be made as a plurality of components (or, a plurality of either component or a plurality of both components), such as an inner component and an outer component, as explained in more detail below. The shape of the arrester may also vary, for example, depending on the working surface. The arrester may also be in the form of a single component, while having two parts of the same form as the arrester, since the inner and outer parts may be made integral with each other.

[0063] In an embodiment of the present disclosure, the device is a surgical rotary file. The surgical rotary file includes a working part, which includes at least one working device for processing a material. The material is selected from bones, cartilage, calcified tissue, teeth, and foreign objects (e.g., implants) in a patient's body. In an embodiment, the surgical rotary file can be a rotary file suitable for cutting, milling, polishing, and / or grinding. For example, the surgical rotary file can be used to perform surgery to treat various conditions, injuries, disabilities, bone dislocations, or dental symptoms.

[0064] In an embodiment, a device such as a surgical rotary file can be attached to a rotating mechanism using an attachment device. For example, the rotating mechanism can be driven by a motor, which can be coupled to the device using a coupling device (such as a chuck, a bearing, and a gear device). In one embodiment, the rotating mechanism can provide a rotating motion to the device. In another embodiment, the rotating mechanism can be adapted to provide a swinging motion to the device. For example, the rotating mechanism can be associated with a suitable motion changing mechanism (gear device) that converts the rotating motion into a swinging motion.

[0065] In an embodiment, the working means for processing the material is selected from a cutting surface or a grinding surface (also referred to as an abrasive surface). In particular, each configuration of the working component can process the material differently depending on the requirements of the operator of the surgical rotary file. If desired, the working component can also include more than one working means.

[0066] In an embodiment, a surgical rotary file may include a working part attached to a handle. Specifically, the working part is a spherical body configured to cut, grind and shape working materials such as bones or teeth. Of course, the working part may also have other shapes, such as cylindrical, egg-shaped, pear-shaped, conical, etc. The present device may also be used for other materials other than hard tissues, such as wood, metal or ceramics. More specifically, at least one working device of the surgical rotary file may be a protruding surface or an elevated surface on the spherical body, which may be used as a cutting surface, a grinding surface or an abrasive surface, etc. Further, the working part may be attached to the handle. The handle may be operably attached to a rotating mechanism to provide a rotational motion to the working part by, for example, an attachment device designed in the handle of the surgical rotary file. Subsequently, the rotation of the working part of the surgical rotary file enables material to be removed from the surface of the working material. In an example, the surgical rasps may be configured to rotate in the range of hundreds or thousands (eg, 1,000-4,000,000) revolutions per minute to effortlessly remove material from the surface of the work material. In an example, the surgical rasps may be used to shape or remove bone to treat symptoms of the head or spine.

[0067] The preventing device is configured to protrude from the working part when the force applied to the preventing device is less than a predetermined amount of force, and is configured to retract when the force applied to the preventing device is equal to or higher than the predetermined amount of force. In an embodiment, the predetermined amount of force is associated with (or based on) the composition of the material contacted by the working device for processing the material. Specifically, when the preventing device is allowed to contact and press against the object, the material (or the composition of the material) may be hard enough to provide a force (equal to or higher than the predetermined amount of force). Therefore, if the preventing device is allowed to contact and press against a material with a soft component, the preventing device may not retract. Alternatively, if the preventing device is allowed to contact and press against a material with a hard component, the preventing device may retract.

[0068] In an embodiment, when the secondary material is softer than the material, the predetermined amount of force is selected to prevent handling of the secondary material. As described above, the secondary material may include a soft component. For example, the secondary material may be a soft tissue such as blood vessels or neural tissue; and the material may be a bone or a tooth. Therefore, when the prevention device is allowed to contact and press against a hard tissue such as a bone or a tooth, the force exerted on the prevention device when in contact with the prevention device may be equal to or greater than the predetermined amount of force.

[0069] According to an embodiment, the working part of the surgical rotary file can be in contact with the material to enable processing of the material when the prevention device is optionally retracted into the at least one recess. In addition, the prevention device is operable to at least reduce the surface contact between the working part and the soft tissue, thereby avoiding any accidental damage to the soft tissue by the working part. In an example, soft tissue such as nerves, blood vessels, etc. may be located near hard tissue such as bones and cartilage in the human body. The soft tissue to be protected may also be a user's finger, or the material to be processed may be a hard material such as a workpiece.

[0070] In an embodiment, the prevention device may include at least one external component and at least one internal component. In yet another embodiment, the prevention device includes at least one external component and at least one internal component, i.e., the internal component and the external component are integrated with each other. Therefore, all the various embodiments and designs described with respect to the internal component and the external component apply mutatis mutandis to the internal component and the external component.

[0071] In an embodiment, the inner member may be made of an elastomer and arranged in at least one recess between the working part and the outer member. The outer member may be a ring. According to an embodiment, when the device is a surgical rotary file, the outer member is a ring. Further, in such an embodiment, the recess may be a circular groove in the working part of the rotary file. Specifically, the recess may be a groove in the spherical surface of the surgical rotary file. In addition, the plane of the groove may be inclined at an angle compared to the central axis of the handle of the surgical rotary file so as to provide protection around the working part when the working part rotates around the axis of rotation. In addition, the groove may be designed to limit the radial movement of the ring on the spherical surface of the rotary file. For example, the groove may be configured to have a V-shaped or stepped profile, which may only allow the ring to perform limited radial movement relative to the working part.

[0072] In one embodiment, the ring has an opening arranged to contact with a notch in the working part to prevent the ring from rotating relative to the working part. Specifically, the core of the rotary file can be constructed with an additional material block attached to the groove. Therefore, this protruding element can prevent the ring from rotating relative to the working part. In addition, the notch can be arranged to fit into the opening of the ring. Therefore, the notch limits the relative movement of the ring relative to the working part. This makes it possible to exclude damage that may be caused by the relative movement of the ring relative to the internal member (especially the elastomeric surface of the internal member). Similarly, the ring can have a protrusion that is arranged to contact with a notch in the working part to prevent the ring from rotating relative to the working part. Further, a closed ring can be used, in which the ring is pressed into a specific shape and the ends of the ring are attached to each other to form a loop. Attachment can be done by, for example, laser welding.

[0073] In an embodiment, the internal member is a spring arranged between the working part and the external member, for example in at least one recess. That is, the internal member (e.g., an elastomer) is configured to act as a spring. Specifically, the internal member is adapted to be compressed when subjected to a force equal to or greater than a predetermined amount, or adapted to expand when released from a force equal to or greater than a predetermined amount. In addition, the size and stiffness or composition of the internal member are selected in such a way that the external member at least partially protrudes from the working part when the force applied to the prevention device is less than a predetermined amount of force, and the external member retracts into at least one recess when the force applied to the prevention device is equal to or greater than a predetermined amount of force. In an embodiment, the internal member (e.g., an elastomer) may include a cutout or cutout on the outer surface of the internal member to provide sufficient space that allows the internal member to be compressed. In another embodiment, the internal member may be a bent circular coil spring. Specifically, such a spring may be a closed loop that is stretched to be installed in at least one recess in the working part. In yet another embodiment, the internal member may be a circular wave spring. Furthermore, such a spring may be welded to the inside of at least one recess in the working part or to an external component.

[0074] According to an embodiment, the outer member (e.g., the ring) is configured to protect the soft tissue from accidental treatment. Specifically, when the ring is pressed against hard tissue such as teeth or bones, the inner member may be compressed to expose the outer surface of the working part of the surgical rotary file. Alternatively, when the outer member is pressed against the soft tissue, the inner member may not be compressed to prevent accidental contact between the working part of the surgical rotary file and the soft tissue.

[0075] In another embodiment, the prevention device may include an elastomer that is arranged in a plurality of recesses in the working part of the surgical rotary file. In addition, the recesses may be in the form of sections on opposite sides of the surgical rotary file, and the elastomer may be arranged in the sections. The elastomer in the sections is configured to protrude or retract according to the force applied to the elastomer. Alternatively, the surgical rotary file may have a cutting edge that is in the shape of a flute (i.e., a working device) in the working part of the surgical rotary file. The elastomer may be arranged in alternating flutes of the elastomer. In addition, the elastomer may retract into the flute (when the force experienced is equal to or greater than a predetermined amount of force) to expose the cutting edge of the surgical rotary file, thereby enabling processing.

[0076] According to an embodiment, the prevention device is a moving part having an outer part and an inner part, and the outer part is configured to protrude from the working part so as to prevent the working surface treatment material when the prevention device is in its first position. In fact, in this embodiment, the inner part is configured to act as a spring, wherein the spring constant is sized so that when the force applied to the prevention device is less than a predetermined amount of force, the outer part at least partially protrudes from the working part, and when the force applied to the prevention device is equal to or higher than the predetermined amount of force, the outer part retracts into the at least one recess.

[0077] In an embodiment, the working device is a cutting edge and the preventing device comprises a plurality of flaps, each flap being arranged between two cutting edges. In this case, each flap is arranged in its first position to push soft tissue away from the cutting edge, thereby preventing the cutting edge from contacting the soft tissue. Thus, each flap is arranged in its second position to allow the working device to contact hard tissue.

[0078] In another embodiment, the working part of the surgical rotary file may be cylindrical in shape. In this embodiment, the working means is a cutting edge on a cylindrical surface, and the preventing means comprises a plurality of flaps, each flap being arranged between two cutting edges. In this case, each flap is arranged to push soft tissue away from the cutting edge in its first position and to allow the working means to come into contact with hard tissue in its second position. The flaps may be made of metal or plastic, for example of thin sheets of stainless steel.

[0079] Therefore, as described above, the surgical rotary file can be attached to the rotary mechanism using a handle attached to the working part. In addition, the working part may include a cutting edge on the surface of the working part. In addition, the preventing device may be arranged between the cutting edges of the working part. Specifically, the preventing device may be an elastic flap arranged between the cutting edges. More specifically, the elastic flap may be attached to the working part using spot welding or laser welding from the first end. In addition, in the case of a plastic flap, an adhesive may be used to attach the elastic flap. Alternatively, the working part may have a groove or the like, in which the end of the flap or a protrusion at one end of the flap (such as a guide rail) may be arranged. In operation, when the force applied to the preventing device is less than a predetermined amount of force, the preventing device may push the soft tissue away from the cutting edge, thereby preventing the cutting edge from contacting the soft tissue. In addition, when the force applied to the preventing device is equal to or higher than a predetermined amount of force, the preventing device may be retracted and pressed against the working part.

[0080] In an embodiment, a prevention device such as an elastic flap arranged between the cutting edges of a surgical rotary file may have a filler arranged on a second edge of the elastic flap. Specifically, the filler member may be an elastomeric member that can be compressed to allow the prevention device to retract. In addition, the filler member can prevent the processed material from accumulating behind the elastic flap. In another embodiment of the present disclosure, the device is a twist drill. The twist drill is a cylindrical tool having a working part that includes at least one working surface for drilling a hole in an object. Further, the twist drill may include being attached to a rotating mechanism using an attachment device (such as a handle) so that the twist drill can drill a hole in the object.

[0081] In an embodiment, the at least one working surface may be at least one cutting edge in the bottom end and a flute for drilling a hole in an object. In another embodiment, when the device is a twist drill, the at least one recess may be a hole in the working part. In particular, the recess is a longitudinal hole in the working part close to the cutting edge of the drill bit for arranging the prevention device therein. In an embodiment, the recess may include more than one hole in the working part of the drill bit for arranging more than one prevention device therein.

[0082] In an embodiment, at least one preventing device comprises at least one external member and at least one internal member, and the internal member is in the form of a spring. Specifically, at least one internal member and at least one external member may be configured to be arranged in at least one recessed portion (such as a hole) in a working component, and the working component is configured at the bottom end of the twist drill. In one embodiment, at least one external member may look like a hook, that is, the at least one external member has a rod and a hook-shaped tip. In addition, at least one external member may be installed in the hole. For example, at least one external member may include a protruding member or a stopper adapted to be received by a recess around the hole so that at least one external member does not fall out of the hole. Alternatively, for example, using a suitable adhesive, at least one external member may be coupled to at least one internal member, and at least one internal member may be further coupled to the hole. At least one internal member is arranged in a hole between the twist drill and at least one external member. In an embodiment, at least one preventing device of the twist drill may include a pair of holes, each hole accommodating at least one internal member and at least one external member therein.

[0083] According to an embodiment, the inner portion may be a coil spring, and the size of the spring is designed so that when the force applied to the prevention device is less than a predetermined amount of force, the outer portion at least partially protrudes from the working part. In addition, when the force applied to the prevention device is equal to or higher than a predetermined amount of force, the outer portion retracts into at least one recess. Specifically, when the outer portion is pressed against a hard tissue such as a bone, the outer portion may compress the inner portion to expose the cutting edge of the twist drill. Therefore, the outer portion prevents accidental contact between at least one working surface and soft tissue. Specifically, if at least one working surface comes into contact with the soft tissue (or moves away from the hard tissue), the tip of the outer member may protrude due to the lack of a predetermined force, thereby preventing damage to the soft tissue.

[0084] On the other hand, an embodiment of the present disclosure therefore provides a twist drill, the twist drill comprising:

[0085] - at least one prevention device;

[0086] - attachment means; and

[0087] - a working part comprising at least one working surface for drilling a hole in an object;

[0088] Wherein, at least one preventing device is configured to have:

[0089] - a first position in which the at least one preventing device protrudes from the working member to prevent the working surface from drilling a hole in the object when a force applied to the preventing device is less than a predetermined amount of force; and

[0090] - a second position in which the at least one preventing device is retracted to allow the working surface to drill a hole in the object when a force applied to the preventing device is equal to or greater than a predetermined amount of force.

[0091] In this embodiment, the working surface is located at the bottom end of the drill bit. That is, the drill bit is attached to the drill from one end, and the working surface (in this case the cutting edge) is arranged in the other end (ie the bottom end).

[0092] In another aspect, an embodiment of the present disclosure provides a saw as described above. The saw comprises:

[0093] - prevention devices;

[0094] - attachment means; and

[0095] - a working part comprising at least one working surface in the form of working teeth for cutting an object;

[0096] Wherein, the prevention device is constructed to have:

[0097] - a first position in which the force applied to the preventing device is less than a predetermined amount of force

[0098] When the workpiece is cut, the preventing device protrudes from the working part to prevent the working surface from cutting the object; and

[0099] - a second position in which, when a force applied to the preventing device is equal to or greater than a predetermined amount of force, the preventing device retracts to allow the working surface to cut the object.

[0100] In yet another embodiment of the present disclosure, the device may thus be a saw. Further, the working part of the saw may include at least one working surface in the form of working teeth for cutting an object. In addition, the working part may be attached to an attachment device, which may be optionally integral with the saw and is adapted to be operably coupled to the rotation mechanism to provide an oscillating motion to the saw.

[0101] Optionally, the saw is selected from a reciprocating saw blade, a circular saw blade, and an oscillating saw blade. In an embodiment, the saw may be an oscillating saw blade or a reciprocating saw blade. The oscillating saw blade may include a recess on its surface. Further, the prevention device may be arranged in a recess on the surface of the oscillating saw blade adjacent to the working teeth. In addition, the internal member of the prevention device may be a spring, which may be placed in the recess to control the protrusion and retraction of the external member of the prevention device relative to the recess. Therefore, the spring may be made of an elastomeric component, or the spring may be a conventional metal spring. In an embodiment, the external member may be a comb-like structure configured to protrude between the working teeth of the oscillating saw blade. The external member is configured to prevent accidental contact between the working teeth and soft tissue. Further, when the external member is subjected to hard tissue, the external member of the prevention device may be retracted into the recess, thereby exposing the working teeth of the oscillating saw blade to the hard tissue. In these embodiments, the device may also be designed without a recess as described above on the working part.

[0102] According to an embodiment, the saw may be a circular saw blade. Further, the circular saw blade may include a central mounting hole, which is suitable for being operably connected to a rotating mechanism using an attachment device to obtain a rotating movement. Further, the prevention device may be arranged in at least one recessed portion present on either or both sides of the circular saw blade, and / or arranged in the middle of the circular saw blade. The prevention device may include, for example, two separated semicircular outer members on at least one side of the circular saw blade. The semicircular outer member is configured to protrude from the side surface of the circular saw blade, i.e., at least partially cover the sharp edge of the working tooth.

[0103] In one embodiment, the prevention device further comprises an internal member such as a pair of elliptical spring members, which are positioned between the external members on at least one side of the circular saw blade. The spring may be configured to push one or more moving parts outward or pull one or more moving parts inward. For example, at high speeds of rotation, the centrifugal force is so high that the force required to retract the moving parts into the recess is too high for practical purposes. In this case, a tension spring is required to reduce the force at high operating speeds. Specifically, the semicircular external members on each side of the cutting disc may have a common internal member to control the protrusion and retraction of the external members relative to the recess. In addition, the protrusion and retraction of the external members relative to each quarter circle are configured separately. Therefore, the circular saw blade is operable to perform cutting of an object and simultaneously protect secondary objects around the object (e.g., soft tissue adjacent to hard tissue or a user's finger or hand). In addition, the semicircular external member of the prevention device may be supported by a support tab, which is configured in a recess on the surface of the circular saw blade. The number of support tabs may be, for example, one, two, three, four, five or six. Each support tab typically includes a head and a shaft, and the head and the shaft are arranged in a hole arranged in the circular saw blade by a press fit. Further, the common inner member on each side of the circular saw blade can be supported between the semicircular outer members by means of the support tabs (more preferably, the shafts of the support tabs). Therefore, the prevention device on each side of the circular saw blade can be configured to protect the alternating quarter-circle working teeth from accidental contact with secondary objects.

[0104] The arrangement of the working teeth described above may have different structures. For example, the working teeth may be divided into four groups of working teeth. These groups of working teeth may protrude from the middle plane in opposite directions depending on the position of the moving parts adjacent to the working teeth. The number of working tooth groups may depend on the number of moving parts. Typically, a circular saw blade is configured to be able to make a cut as wide as the width of the saw blade. If the moving parts are placed in the same plane, the cutting penetration is limited because the moving parts do not have the ability to remove the material in front of them.

[0105] As mentioned above, the present apparatus may have various forms. Another possible form is a reciprocating saw blade, in which the cutting action is achieved by a push-pull ("reciprocating") motion of the saw blade. The saw blade of such a reciprocating saw may be arranged in any suitable manner, for example as described above in connection with an oscillating saw blade. Further possibilities are any kind of rotary file in various forms, some of which are shown below in connection with the accompanying drawings.

[0106] According to embodiments, the object to be processed by the device (of the present disclosure) may have different compositions. For example, the object may be composed of a material selected from bones, teeth, cartilage, calcified tissue, crust, wood, metal, plastic. Specifically, the device of the present disclosure is operable to process objects in woodworking, metalworking and plastic industries. Further, the crust may be a hardened layer, a sediment or a coating on the surface of the object. The device can be used to process the crust on the surface of the object. In addition, the device can be used for large-scale applications such as woodworking and metalworking to achieve better control of handheld devices, targeted processing and minimal damage to objects such as wooden boards, metal plates, etc.

[0107] Detailed description of the drawings

[0108] refer to Figure 1 , shows a perspective view of a surgical rotary file 100 according to an embodiment of the present disclosure. As shown, the surgical rotary file 100 includes a working part 102 having at least one working device 104. In addition, the working part 102 is spherical in shape. The working part 102 is attached to a handle 106. The handle 106 includes an attachment device 108 at its other end to allow the handle 106 to receive a rotational motion. Further, the working part 102 includes a prevention device 110. In addition, the prevention device 110 includes an external member 112, which is a ring in this embodiment. The surgical rotary file 100 is a cutting rotary file, and the working device 104 is a cutting edge. In addition, the axis A shows the axis of the rotational motion of the surgical rotary file 100.

[0109] refer to Figure 2 , showing Figure 1 1 is an exploded view of a surgical rotary file 100 according to an embodiment of the present disclosure. As shown, the working part 102 includes at least one recess 202 for arranging a prevention device therein. The prevention device includes an outer member 112 and an inner member 204. Optionally, the inner member 204 is made of an elastomer and is arranged in at least one recess 202 between the working part 102 and the outer member 112. The inner member 204 includes a cutout 206 on an outer surface of the inner member 204.

[0110] refer to Figure 3 , shows a bottom view of a surgical rotary file 100 according to an embodiment of the present disclosure. As shown in the figure, the working part 102 includes a working device 104 such as a cutting edge 105. In addition, a prevention device 110 is arranged on the working part 102.

[0111] refer to Figure 4 and Figure 5, showing a rear view and a front view of a surgical rotary file 100 according to an embodiment of the present disclosure. The surgical rotary file 100 includes a working part 102, which includes at least one working device such as a working device 104. In addition, a prevention device 110 is arranged on the working part 102. The working part 102 is attached to a handle 106. Figure 5 Angle α is also shown. In practice, the plane of the groove is inclined at an angle α compared to the axis of rotation A of the surgical burr.

[0112] refer to Figure 6 , showing Figure 5 A cross-sectional view of a surgical rotary file 100 along BB according to an embodiment of the present disclosure. As shown, the surgical rotary file 100 includes a recessed portion 202 present along the surface of the working member 102 of the surgical rotary file 100. The recessed portion 202 includes a stepped configuration. In addition, the stepped recessed portion 202 is shown to receive a prevention device therein, in particular, the outer member 112 and the inner member 204.

[0113] refer to Figure 7 , showing Figure 6 1 is an enlarged view of the encircled portion D of the surgical rotary file 100 according to an embodiment of the present disclosure. As shown, the recessed portion 202 includes a stepped configuration, which is shown to receive the prevention device therein, specifically the outer member 112 and the inner member 204. In addition, the stepped configuration only allows limited radial movement of the outer member 112 relative to the working part 102. In addition, the stepped configuration allows limited compression of the inner member 204.

[0114] refer to Figure 8 , Fig. 9 and Fig.10 , showing Figure 5 A cross-sectional view of a surgical rotary file 100 along CC according to various embodiments of the present disclosure. As shown in the figure, the surgical rotary file includes a working part 102. Further, the working part 102 includes a prevention device 110. The prevention device includes an external member 112 and an internal member 204. Figure 8 As shown, the inner member 204 is made of an elastomer. The inner member 204 is arranged in a recessed portion between the core 203 of the working part 102 and the outer member 112. In addition, the inner member 204 includes a cutout 206, which is arranged on the outer surface of the inner member 204 to allow the inner member to be compressed. Fig. 9 As shown, the internal member 204 is a circular bent disc spring. Fig.10 In FIG. 2 , the inner member 204 is a circular wave spring. Figure 8 , Fig. 9 and Fig.10Also shown is a laser weld, indicated by reference numeral 205 .

[0115] refer to Fig.11 , shows a perspective view of a surgical rotary file 1100 according to an embodiment of the present disclosure. As shown, the surgical rotary file 1100 includes a working part 1102 having at least one working device such as a working device 1104. In addition, the working part 1102 is spherical in shape. The working part 1102 is attached to a handle 1106. The handle 1106 includes an attachment device 1108 at its other end to allow the handle 1106 to receive a rotational motion. Further, the working part 1102 includes a prevention device 1110. In addition, the prevention device 1110 includes an outer member 1112 such as a ring. The outer member 1112 includes an opening 1114, which is arranged to contact a notch 1116 in the working part 1102. The surgical rotary file 1100 is a grinding rotary file, and the working device 1104 is a working surface. In addition, the axis E shows the axis of the rotational motion of the surgical rotary file 1100.

[0116] refer to Fig.12 , showing Fig.11 A cross-sectional view of a surgical rotary file 1100 along FF according to an embodiment of the present disclosure. As shown, the prevention device 1110 includes an outer member 1112 and an inner member 1202. The inner member 1202 includes a cutout 1204 on an outer surface of the inner member 1202. The inner member 1202 is arranged in a recessed portion between the core 1206 of the working part 1102 and the outer member 1112. In addition, the recess 1116 is arranged to contact the opening 1114 in the outer member 1112 of the prevention device 1110.

[0117] refer to Figures 13 to 16 , showing Figure 1 Schematic diagram of a surgical rotary file 100 in use according to an embodiment of the present disclosure. Optionally, it can be used in a similar manner Fig.11 As shown in the figure, the surgical rotary file 100 includes a prevention device 110 and a working part 102, wherein the working part 102 has a working device 104. The prevention device 110 is configured to be Fig.14 The secondary material 1302 protrudes when the force applied to the preventing device 110 is less than a predetermined amount of force. Therefore, the secondary material 1302 is not contacted by the working device 104, as shown by the distance P between the secondary material and the working device.

[0118] Reference now Fig.15 and Fig.16 , the prevention device 110 is configured to prevent the material (such as hard tissue) 1602 (such as Fig.16 The device 104 of the working member 102 is retracted into the recessed portion 202 when a force equal to or greater than a predetermined amount of force is applied to the preventing device 110 (as shown). This exposes the working device 104 of the working component 102 to the material 1602.

[0119] refer to Fig.17 , a perspective view of a surgical rotary file 1700 according to an embodiment of the present disclosure is shown. As shown, the surgical rotary file 1700 includes a working part 1702 having at least one working device such as a working device 1704. In addition, the working part 1702 is cylindrical in shape. The working part 1702 is attached to a handle 1706. The handle 1706 includes an attachment device 1708 at the other end thereof to allow the handle 1706 to receive a rotational motion. Further, the working part 1702 includes an elastic flap such as an elastic flap 1710 as a preventing device. In addition, an elastic flap such as the elastic flap 1710 is attached to the working part 1702 from a first end 1712 of the elastic flap using spot welding, laser welding, or an adhesive. In addition, optionally, an elastic flap such as the elastic flap 1710 may have a filler such as a filler 1714, which is attached to a second end 1716 of the elastic flap 1710. The surgical burr 1700 is a cutting burr and the working device 1704 is a cutting edge.

[0120] refer to Fig.18 , shows an exploded view of a surgical rotary file 1700 according to an embodiment of the present disclosure. A working part 1702 of the surgical rotary file 1700 includes a cutting edge as a working device 1704. In addition, an axis G shows an axis of rotational motion of the surgical rotary file 1700. In addition, the surgical rotary file 1700 includes an elastic flap such as an elastic flap 1710 as a preventing device. The elastic flap such as the elastic flap 1710 is attached to the working part 1702 from a first end of the elastic flap (such as a first end 1712 of the elastic flap 1710). In addition, a filler such as a filler 1714 is attached to a second end of the elastic flap (such as a second end 1716 of the elastic flap 1710).

[0121] refer to Fig.19 , shows a bottom view of a surgical rotary file 1700 according to an embodiment of the present disclosure. As shown, a working part 1702 includes a working device 1704 such as a cutting edge. In addition, an elastic flap such as an elastic flap 1710 is arranged on the working part 1702. In addition, a filler such as a filler 1714 is arranged between the elastic flap such as the elastic flap 1710 and the working part 1702.

[0122] refer to Fig. 20 and Fig.21, shows a perspective view of a surgical rotary file according to various embodiments of the present disclosure. As shown in the figure, the surgical rotary file 2000 includes a cutting edge 2002 in the shape of a chip flute 2003 as a working device on a working part 2004 (having a working surface 2005) of the device 2000. The surgical rotary file 2000 includes a prevention device, which includes a pair of elastomeric segments 2006 and 2007 on opposite sides of the working part 2004 of the device 2000. The elastomeric segments 2006 and 2007 are configured to protrude or retract according to the force applied to the elastomeric segments. Further, as Fig.21 As shown, the device 2100 includes cutting edges 2101 and 2102 in the shape of flutes 2103 on a working part 2104 (having a working surface 2108) of the surgical rotary file 2100. Further, the surgical rotary file 2100 also includes a prevention device such as an elastic body 2106 and 2107, which is arranged in alternating flutes on the working part 2104. In addition, the devices 2000 and 2100 are shown to include attachment devices 2010 and 2110 integral with the rotary file, which are adapted to be operably coupled to a rotation mechanism (not shown).

[0123] Fig. 22 and Fig.23 Another embodiment of the device according to the present disclosure is shown. Fig. 22 In FIG. 2 , the device 2200 comprises a working part 2202, which comprises a working surface 2205, a prevention device 2204 and a recess 2206 into which the prevention device 2204 can enter. In addition, the device comprises a handle 2212 and a spring 2208 for applying a force to the prevention device 2204. The rotation axis H of the device is also shown. Fig.23 , device 2200 is shown as Fig. 22 , and it can be seen that the prevention device 2204 has a hook shape 2304 at its end and a protruding part 2302 at its other end. The spring 2208 surrounds the shaft.

[0124] refer to Fig.24 , a perspective view of a twist drill 2400 according to an embodiment of the present disclosure is shown. As shown, the device 2400 includes a working part 2402 having at least one working surface such as a working surface 2405, the at least one working surface having a cutting edge 2403 and a flute 2404. The twist drill 2400 also includes at least one prevention device such as a prevention device 2406. In addition, the twist drill 2400 is shown as including an attachment device 2401 integral with the drill bit, the attachment device being adapted to be operably coupled to a drilling device (not shown). The rotation axis I of the device is also shown.

[0125] refer to Fig.25 , showing Fig.24 2400 according to an embodiment of the present disclosure. As shown in the figure, the internal component 2502 of the prevention device 2406 is arranged on the working part (2402, such as Fig.24 as shown) and between the external component 2504 of the prevention device 2406.

[0126] refer to Fig.26 , shows a front view of an oscillating saw blade 2600 according to an embodiment of the present disclosure. As shown, the oscillating saw blade 2600 includes a working part 2602 having working teeth 2604 as a working surface and a prevention device 2606 arranged in a recess 2608 present on the surface of the device 2600. The prevention device 2606 includes an outer member 2610 and an inner member 2612. The protrusion and retraction of the outer member 2610 are controlled by the inner member 2612 of the prevention device 2606. In addition, the device 2600 is shown to include an attachment device 2620 integral with the oscillating saw blade, which is suitable for being operably connected to an oscillating mechanism (not shown).

[0127] refer to Fig. 27 , shows a perspective view of a circular saw 2700 associated with a cutting disk according to an embodiment of the present disclosure. As shown, the saw 2700 includes a circular saw blade 2702 having working teeth 2704 as a working surface. The saw 2700 also includes a prevention device 2706 on each side of the circular saw blade 2702. The prevention device 2706 includes two semicircular outer members, depicted as outer members 2710 and 2712, located on each side of the circular saw blade 2702, and a common inner member 2718 arranged in a recess 2720 on the surface of the circular saw blade 2702. The outer members 2710 and 2712 are supported with the help of support tabs 2730 and 2732, respectively. Further, the common inner member 2718 is supported with the help of additional support tabs 2740 and 2742. Additionally, the saw 2700 is shown to include an attachment arrangement 2750 integral with the circular saw blade 2702, the attachment arrangement being adapted to be operably coupled to a rotation mechanism (not shown). An axis of rotation J of the device is also shown.

[0128] refer to Fig.28 , showing Fig. 27 2800 according to an embodiment of the present disclosure. As shown, the saw 2700 has two sides 2802 and 2804. Further, the external members 2710 and 2712 are shown as being arranged on the side 2802, and the external member 2714 is shown as being arranged on the side 2804.

[0129] refer to Fig.29, shows a cross-sectional view of a circular surgical burr perpendicular to the central axis of the burr. The burr includes flutes 122 and 123 having rake faces 132 and 133 and clearance surfaces 142 and 143. The rake face and clearance surface of each flute intersect to form a cutting edge 152 and 153 extending along the length of the flute.

[0130] The embodiments of the present disclosure described above may be modified without departing from the scope of the present disclosure as defined by the appended claims. Expressions such as "comprising," "including," "containing," "having," "being," and the like used to describe and claim the present disclosure are intended to be understood in a non-exclusive manner, i.e., items, parts, or elements not explicitly described are also permitted. References to the singular form should also be understood to relate to the plural.

Claims

1. A surgical saw, comprising: - a prevention device (2606), said prevention device comprising an inner member (2612) and an outer member (2610); - attachment means (2620); and - a working part (2602) comprising at least one working surface in the form of working teeth (2604) for cutting an object; Wherein, the prevention device is constructed to have: a first position in which, when a force applied to the preventing device is less than a predetermined amount of force, the preventing device protrudes from the working member to prevent the working surface from cutting the object, and - a second position in which, when a force applied to the preventing device is equal to or greater than a predetermined amount of force, the preventing device retracts to allow the working surface to cut the object; Wherein, the surgical saw is an oscillating saw blade (2600); It is characterized in that the external member is a comb-like structure, and the comb-like structure is configured to protrude between the working teeth (2604) of the oscillating saw blade.

2. The surgical saw according to claim 1, wherein: The oscillating saw blade (2600) includes a recessed portion (2608) on a surface thereof, and the preventing device (2606) is arranged in the recessed portion and adjacent to the working teeth (2604).

3. The surgical saw according to claim 2, wherein: The internal member is a spring, which is placed in the recess (2608) to control the projection and retraction of the external member relative to the recess.

4. The surgical saw according to claim 3, wherein: When the outer member encounters hard tissue, the outer member (2610) of the preventing device (2606) retracts into the recessed portion (2608), thereby exposing the working teeth (2604) of the oscillating saw blade (2600) to the hard tissue.

5. A surgical saw according to any one of the preceding claims, wherein: The working member (2602) is attached to the attachment device (2620), which is adapted to be operably coupled to a rotation mechanism to provide an oscillating motion to the surgical saw.

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