Safety type reaming bur

Abstract

The safety type reaming burr of the present application comprises a rod body and a working head; the working head is integrally combined at the lower end of the rod body; wherein: the rod body comprises an upper rod body and a lower rod body; the working head is located at the lower end of the lower rod body; the lower end of the upper rod body and the upper end of the lower rod body are slidably inserted together; an elastic member is installed between the lower end of the upper rod body and the upper end of the lower rod body; when the pressure received by the lower end of the lower rod body is greater than or equal to a predetermined value, the elastic member is compressed, the lower end face of the upper rod body and the upper end face of the lower rod body are engaged together, so that the upper rod body and the lower rod body can integrally rotate; when the pressure received by the lower end of the lower rod body is less than the predetermined value, the elastic member pushes the lower end face of the upper rod body and the upper end face of the lower rod body to move in opposite directions, the lower end face of the upper rod body and the upper end face of the lower rod body are separated, so that the lower rod body will not rotate with the upper rod body.

Description

Technical Field

[0001] This application relates to dental burs, and more particularly to a safe type of endodontic bur. Background Technology

[0002] Dental phobia is a common patient experience. When patients feel anxious or suddenly experience pain, they may uncontrollably open and close their mouths or twist their bodies; this is common in adults and even more so in children. During pulpotomy, dentists use a handpiece equipped with a bur. If a patient suddenly closes their mouth or moves while the bur is rotating at high speed, it is extremely dangerous. The dentist needs reaction time to stop the bur's rotation in an emergency; before the dentist can react, the high-speed rotating bur, having disengaged from the cutting position, can easily scratch other tissues in the oral cavity.

[0003] Furthermore, pulpotomy involves using a dental handpiece equipped with a bur to drill through the occlusal surface of the tooth pulp to reach the pulp chamber floor. When the bur penetrates the occlusal surface and reaches the pulp, a hollowing-out sensation will be felt; at this point, the procedure must be stopped immediately. Dentists can develop a feel for this technique through practice. However, for novice dentists, the hollowing-out sensation is not readily apparent during the procedure. Additionally, children often have poor cooperation; if a child twists or turns while drilling through the occlusal surface, the dentist may also find it difficult to perceive the hollowing-out sensation.

[0004] Opening the spinal cord with acupuncture needles Figure 1 As shown, it includes a rod body 10 and a working head 20. Figure 1 The working head 20 shown is a spherical grinding head, but the working head 20 can also be other shapes. Summary of the Invention

[0005] In view of the above problems, this application aims to provide a safe endodontic bur that can promptly retract the power of the working head when it leaves the cutting position, allowing the dentist to react relatively calmly and thus reducing the risk of scratching surrounding tissues. This application also aims to provide a safe endodontic bur that can provide clear feedback to the dentist when the bur penetrates the occlusal surface of the pulp, allowing the dentist to stop the work in time and avoid damage to the pulp chamber floor tissue.

[0006] This application proposes a safety-type medullary puncture needle, which includes a shaft and a working head; the working head is integrally attached to the lower end of the shaft; wherein:

[0007] The rod body includes an upper rod body and a lower rod body; the working head is located at the lower end of the lower rod body; the lower end of the upper rod body and the upper end of the lower rod body can be slidably inserted together; an elastic member is installed between the lower end of the upper rod body and the upper end of the lower rod body;

[0008] When the pressure on the lower end of the lower rod is greater than or equal to a predetermined value, the elastic member is compressed, and the lower end face of the upper rod and the upper end face of the lower rod mesh together, allowing the upper and lower rods to rotate as a whole. When the pressure on the lower end of the lower rod is less than the predetermined value, the elastic member pushes the lower end face of the upper rod and the upper end face of the lower rod to move in opposite directions, separating the lower end face of the upper rod and the upper end face of the lower rod, so that the lower rod will not rotate with the upper rod.

[0009] Preferably, the lower end of the upper rod body forms a cylindrical first joint portion, and a cylindrical first hollow portion is formed at the center of the first joint portion; the lower end of the first joint portion forms an outwardly protruding first annular edge; the lower end surface of the first joint portion constitutes the lower end surface of the upper rod body.

[0010] The upper end of the lower rod forms a cylindrical second joint, and the center of the second joint forms a cylindrical second hollow part; the upper end of the second joint forms an inwardly protruding second annular edge; the bottom surface of the second hollow part constitutes the upper end surface of the lower rod.

[0011] The first connecting part is inserted into the second hollow part; when the lower end face of the upper rod and the upper end face of the lower rod separate, the first annular edge can slide and rotate within the second hollow part; the second annular edge is used to prevent the first connecting part from coming out of the second hollow part.

[0012] Preferably, the elastic member includes a spring body and a ball fixed to the lower end of the spring body; the upper end of the spring body is used to abut against the top surface of the first hollow part; the ball is used to abut against the center position of the bottom surface of the second hollow part.

[0013] Preferably, the center of the bottom surface of the second hollow portion is a smooth surface;

[0014] Multiple convex teeth are formed along the lower end face of the upper rod; these multiple convex teeth are distributed in a circular shape.

[0015] Multiple grooves are formed along the upper end face of the lower rod; these grooves are distributed in a circular pattern.

[0016] When the pressure on the lower end of the lower rod is greater than or equal to a predetermined value and the spring body of the elastic member is compressed, the plurality of protruding teeth and the plurality of grooves engage together, thereby connecting the upper rod and the lower rod together.

[0017] Optionally, the center of the bottom surface of the second hollow part is a smooth surface;

[0018] Multiple convex teeth are formed along the lower end face of the upper rod; these multiple convex teeth are distributed in a circular shape.

[0019] Multiple convex teeth are formed along the upper end face of the lower rod; these multiple convex teeth are distributed in a circular shape.

[0020] When the pressure on the lower end of the lower rod is greater than or equal to a predetermined value and the spring body of the elastic member is compressed, they engage together, and the multiple protrusions of the upper rod and the multiple protrusions of the lower rod engage together in an alternating manner, thereby connecting the upper rod and the lower rod together.

[0021] Preferably, a plurality of recesses are formed on the outer peripheral surface of the lower rod. These recesses are used to generate a predetermined sound by friction with the surrounding air when the lower rod rotates, thereby providing the user with objective evidence as to whether the lower rod rotates together with the upper rod.

[0022] Preferably, an upper limit ring is formed at the lower part of the upper rod; and a lower limit ring is formed at the upper part of the lower rod.

[0023] The lower part of the upper rod has the same outer diameter as the upper part of the lower rod, and the lower part of the upper rod and the upper part of the lower rod form external threads in the same direction on their outer circumferential surfaces; the external threads of the lower part of the upper rod and the upper part of the lower rod together form an external thread segment; a sleeve is installed on the external thread segment, and an internal thread is formed on the inner circumference of the sleeve; the sleeve is joined to the external thread segment through its internal thread.

[0024] When the lower end of the sleeve abuts against the lower limit ring, the external thread connection between the lower part of the upper rod and the upper part of the lower rod is covered by the sleeve. At this time, the elastic member cannot separate the lower end face of the upper rod and the upper end face of the lower rod that are engaged together.

[0025] When the upper end of the sleeve abuts against the upper limit ring, the external thread connection between the lower part of the upper rod and the upper part of the lower rod is below the sleeve. When the pressure on the lower end of the lower rod is less than the predetermined value, the elastic member can separate the lower end face of the upper rod and the upper end face of the lower rod that are engaged together.

[0026] Preferably, an upper indicator mark is formed at the lower end of the upper rod body; a lower indicator mark is formed at the upper end of the lower rod body; when the upper indicator mark and the lower indicator mark are aligned and the lower end face of the upper rod body and the upper end face of the lower rod body are engaged together, the sleeve can be simultaneously attached to the upper rod body and the lower rod body.

[0027] Preferably, the recesses are symmetrically distributed on the outer circumferential surface of the lower rod.

[0028] Preferably, the recess is located below the lower limiting ring.

[0029] This application's safe medullary bur utilizes a two-section design with an upper and lower shaft. When the lower shaft is subjected to pressure greater than or equal to a predetermined value, the upper and lower shafts engage and rotate as a single unit, functioning like a regular medullary bur. When the pressure on the lower shaft is less than the predetermined value, the upper and lower shafts separate. The upper shaft rotates, but the lower shaft does not rotate with it. Therefore, the working head at the lower end of the lower shaft does not rotate, preventing scratching of surrounding tissues and damage to the floor of the medullary chamber. Furthermore, the concave area on the lower shaft's circumference rubs against the air during rotation, producing a predetermined sound. This sound diminishes or disappears when the lower shaft significantly decelerates or stops rotating, allowing the operator to determine whether the lower shaft and working head have lost power based on the sound. Attached Figure Description

[0030] Figure 1 A schematic diagram of an existing suture for opening the medullary canal;

[0031] Figure 2 This is a front view structural diagram of the safety-type medullary bur of this application in state one;

[0032] Figure 3 This is a schematic diagram of the front view structure of the second state of the safety-type medullary suture needle of this application;

[0033] Figure 4 This is a three-dimensional structural diagram of the upper shaft of the safety-type medullary puncture needle of this application;

[0034] Figure 5 for Figure 4 A schematic diagram of the main structure of the upper rod;

[0035] Figure 6 for Figure 4 A schematic diagram of the upper rod structure viewed from below;

[0036] Figure 7 This is a three-dimensional structural diagram of the lower shaft of the safety-type medullary bur of this application;

[0037] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure of the lower rod;

[0038] Figure 9 for Figure 7 A top view of the lower rod structure;

[0039] Figure 10 A schematic diagram of the elastic component of the safety-type medullary suture needle for application;

[0040] Figure 11 This is a schematic diagram showing the engagement of the lower end face of the upper shaft and the upper end face of the lower shaft of the safety-type medullary bur of this application.

[0041] Figure 12 This is a schematic diagram showing the separation of the lower end face of the upper shaft and the upper end face of the lower shaft of the safety-type medullary bur of this application; Detailed Implementation

[0042] The safety-type medullary suture of this application will now be described in detail with reference to the accompanying drawings.

[0043] This application proposes a safety-type medullary puncture needle, which includes a shaft 10 and a working head 20; the working head 20 is integrally attached to the lower end of the shaft 10. Although a spherical working head is shown in the accompanying drawings, this application is not limited to a spherical working head, and may also include other working heads already existing in the prior art.

[0044] In this application, the rod 10 includes an upper rod 10a and a lower rod 10b. The working head 20 is located at the lower end of the lower rod 10b.

[0045] The lower end of the upper rod 10a and the upper end of the lower rod 10b can be slidably inserted together; an elastic member 40 is installed between the lower end of the upper rod 10a and the upper end of the lower rod 10b.

[0046] When the pressure on the lower end of the lower rod 10b is greater than or equal to a predetermined value (taking spinal cord opening as an example, this pressure value is generally 30-60g), the elastic member 40 is compressed, and the lower end face of the upper rod 10a and the upper end face of the lower rod 10b engage together, allowing the upper rod 10a and the lower rod 10b to rotate as a unit. When the pressure on the lower end of the lower rod 10b is less than the predetermined value, the elastic member 40 pushes the lower end face of the upper rod 10a and the upper end face of the lower rod 10b to move in opposite directions, separating the lower end face of the upper rod 10a and the upper end face of the lower rod 10b, so that the lower rod 10b does not rotate with the upper rod.

[0047] The lower end of the upper rod 10a forms a cylindrical first joint 14, and a cylindrical first hollow part is formed at the center of the first joint 14; the lower end of the first joint 14 forms an outwardly protruding first annular edge 13a; the lower end surface of the first joint 14 constitutes the lower end surface of the upper rod 10a.

[0048] The upper end of the lower rod 10b forms a cylindrical second joint 17, and a cylindrical second hollow part is formed at the center of the second joint 17; the upper end of the second joint 17 forms an inwardly protruding second annular edge 13b; the bottom surface of the second hollow part constitutes the upper end surface of the lower rod 10b.

[0049] The first connecting part 14 is inserted into the second hollow part; when the lower end face of the upper rod 10a and the upper end face of the lower rod 10b are separated, the first annular edge 13a can slide and rotate in the second hollow part; the second annular edge 13b is used to prevent the first connecting part 14 from coming out of the second hollow part.

[0050] The elastic member 40 includes a spring body and a ball 41 fixed to the lower end of the spring body; the upper end of the spring body is used to abut against the top surface 16 of the first hollow portion; the ball 41 is used to abut against the center position of the bottom surface 18 of the second hollow portion. The upper end of the elastic member 40 may be fixed to the top surface 16 of the first hollow portion; the ball 41 must extend at least partially to the outside, beyond the lower end face of the upper rod, so that when the upper and lower rods are engaged, the elastic member 40 can be in a compressed state and provide the thrust required for the separation of the upper and lower rods.

[0051] The center of the bottom surface 18 of the second hollow part is a smooth surface, so the friction between the sphere 41 and the bottom surface 18 will be very small and can be ignored.

[0052] Multiple protruding teeth 15a are formed along the lower end face of the upper rod 10a; the multiple protruding teeth 15a are distributed in a circular shape; multiple grooves 15b are formed along the upper end face of the lower rod 10b; the multiple grooves 15b are distributed in a circular shape.

[0053] When the pressure on the lower end of the lower rod 10b is greater than or equal to a predetermined value and the spring body 40 of the elastic member is compressed, the plurality of protruding teeth 15a and the plurality of grooves 15b engage with each other, thereby connecting the upper rod 10a and the lower rod 10b together.

[0054] Optionally, a plurality of protruding teeth 15a are formed along the lower end face of the upper rod 10a; the plurality of protruding teeth 15a are distributed in a circular shape; a plurality of protruding teeth are formed along the upper end face of the lower rod 10b; the plurality of protruding teeth are distributed in a circular shape.

[0055] When the pressure on the lower end of the lower rod is greater than or equal to a predetermined value and the spring body 40 of the elastic member is compressed, the upper rod 10a and the lower rod 10b are interlocked and engaged, thereby connecting the upper rod 10a and the lower rod 10b together.

[0056] The lower end face of the upper rod and the upper end face of the lower rod can both be formed as rough surfaces and joined together by friction.

[0057] Multiple recesses 19 are formed on the outer peripheral surface of the lower rod 10b. These recesses 19 are used to generate a predetermined sound when the lower rod 10b rotates and rubs against the surrounding air, thereby providing the user with an objective basis for whether the lower rod 10b rotates together with the upper rod 10a.

[0058] The lower part of the upper rod 10a has an upper limit ring 11a; the upper part of the lower rod 10b has a lower limit ring 11b.

[0059] The lower part of the upper rod 10a has the same outer diameter as the upper part of the lower rod 10b, and the lower part of the upper rod 10a and the upper part of the lower rod 10b form external threads in the same direction on their outer circumferential surfaces. For example, the external threads are distributed between the upper limit ring and the lower limit ring. The external threads of the lower part of the upper rod 10a and the upper part of the lower rod 10b together form an external thread segment. A sleeve 30 is installed on the external thread segment, and an internal thread is formed on the inner circumference of the sleeve 30. The sleeve 30 is connected to the external thread segment through its internal thread.

[0060] When the lower end of the sleeve 30 abuts against the lower limit ring 11b, the external threaded connection between the lower part of the upper rod 10a and the upper part of the lower rod 10b is covered by the sleeve 30. At this time, the elastic member 40 cannot separate the lower end face of the upper rod 10a and the upper end face of the lower rod 10b that are engaged together. Therefore, the safety-type pulp chamber bur of this application can operate like a regular bur. This structural design is mainly for use when determining the entry point on the occlusal surface of the pulp. At this time, the pressure between the working head and the occlusal surface of the pulp is usually relatively small and does not reach the pressure threshold for the engagement of the upper and lower rods. If they are not forcibly joined together, there will be some difficulty in forming the entry point.

[0061] When the upper end of the sleeve 30 abuts against the upper limit ring 11a, the external thread connection between the lower part of the upper rod 10a and the upper part of the upper rod 10b is below the sleeve 30. When the pressure on the lower end of the lower rod 10b is less than a predetermined value, the elastic member 40 can separate the lower end face of the upper rod 10a and the upper end face of the lower rod 10b that are engaged together.

[0062] An upper indicator mark 12a is formed at the lower end of the upper rod 10a; a lower indicator mark 12b is formed at the upper end of the lower rod 10b. When the upper indicator mark 12a and the lower indicator mark 12b are aligned, and the lower end face of the upper rod 10a and the upper end face of the lower rod 10b are engaged, the sleeve 30 can be simultaneously attached to both the upper rod 10a and the lower rod 10b. The main purpose of the upper indicator mark 12a and the lower indicator mark 12b is to ensure that the external threads of the upper rod 10a and the lower rod 10b are not misaligned in the helical direction. If the helical threads are misaligned, it will be difficult to install the sleeve 30 on the upper and lower rods. The upper indicator mark 12a and the lower indicator mark 12b can help the user quickly align the external threads of the upper rod 10a and the lower rod 10b, allowing the sleeve to function smoothly.

[0063] The recesses 19 are symmetrically distributed on the outer circumferential surface of the lower rod 10b. This symmetrical distribution prevents the lower rod from swaying due to the recesses during rotation. The recesses 19 are located below the lower limit ring 11b.

[0064] During the opening of the medullary canal, the upper and lower rods are first engaged together, and then connected externally using a sleeve, such as... Figure 3 , 11 As shown, at this time, the bur of this application can form an entry point on the occlusal surface of the pulp, just like a regular bur.

[0065] After the entry point is formed, the sleeve rotates onto the upper rod body, as follows: Figure 2 As shown; at this time, the upper and lower rods separate under the thrust of the elastic component, as... Figure 12 As shown; the working head is pressed against the entry point and pressure is applied. When the pressure exerted on the working head by the entry point exceeds a predetermined value, the upper and lower rods re-engage. At this time, the upper rod drives the lower rod to rotate, thereby performing the drilling process. Due to the high-speed rotation of the lower rod, the cavities on the outer circumference of the lower rod rub against the air and produce a predetermined sound.

[0066] When the occlusal surface of the dental pulp is drilled through, the pressure on the working head decreases sharply. Under the thrust of the elastic component, the upper and lower rods separate, the speed of the lower rod drops rapidly, the friction between the cavity and the air decreases, and the sound gradually weakens or even disappears, reminding the operator that the speed of the lower rod has decreased or stopped.

[0067] During the procedure, if the patient suddenly opens or closes their mouth or twists, the working head may detach from the cutting or grinding surface. The pressure on the working head will disappear, the upper and lower rods will separate, and the working head will lose its power drive, thus preventing accidental injury or scratches to surrounding tissues. The instantaneous loss of power to the working head provides the doctor with valuable reaction time to promptly remove the needle from the patient's mouth or stop the handpiece's rotation.

[0068] Unless otherwise defined, all technical and / or scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this invention relates. The materials, methods, and embodiments mentioned in this application are illustrative only and not restrictive.

[0069] Although the present invention has been described in conjunction with specific embodiments, those skilled in the art can make appropriate substitutions, modifications and changes within the inventive spirit of this application, and such substitutions, modifications and changes still fall within the protection scope of this application.

Claims

1. A safety-type endodontic bur, comprising a shaft and a working head; the working head is integrally attached to the lower end of the shaft; wherein: The rod body includes an upper rod body and a lower rod body; the working head is located at the lower end of the lower rod body; the lower end of the upper rod body and the upper end of the lower rod body can be slidably inserted together; an elastic member is installed between the lower end of the upper rod body and the upper end of the lower rod body; When the pressure on the lower end of the lower rod is greater than or equal to a predetermined value, the elastic member is compressed, and the lower end face of the upper rod and the upper end face of the lower rod mesh together, allowing the upper and lower rods to rotate as a whole; when the pressure on the lower end of the lower rod is less than the predetermined value, the elastic member pushes the lower end face of the upper rod and the upper end face of the lower rod to move in opposite directions, separating the lower end face of the upper rod and the upper end face of the lower rod, so that the lower rod will not rotate with the upper rod. An upper limit ring is formed at the lower part of the upper rod; a lower limit ring is formed at the upper part of the lower rod. The lower part of the upper rod has the same outer diameter as the upper part of the lower rod, and the lower part of the upper rod and the upper part of the lower rod form external threads in the same direction on their outer circumferential surfaces; the external threads of the lower part of the upper rod and the upper part of the lower rod together form an external thread segment; a sleeve is installed on the external thread segment, and an internal thread is formed on the inner circumference of the sleeve; the sleeve is joined to the external thread segment through its internal thread. When the lower end of the sleeve abuts against the lower limit ring, the external thread connection between the lower part of the upper rod and the upper part of the lower rod is covered by the sleeve. At this time, the elastic member cannot separate the lower end face of the upper rod and the upper end face of the lower rod that are engaged together. When the upper end of the sleeve abuts against the upper limit ring, the external thread connection between the lower part of the upper rod and the upper part of the lower rod is below the sleeve. When the pressure on the lower end of the lower rod is less than the predetermined value, the elastic member can separate the lower end face of the upper rod and the upper end face of the lower rod that are engaged together.

2. The safety-type medullary suture needle according to claim 1, characterized in that: The lower end of the upper rod forms a cylindrical first joint, and a cylindrical first hollow part is formed at the center of the first joint; the lower end of the first joint forms an outwardly protruding first annular edge; the lower end surface of the first joint constitutes the lower end surface of the upper rod. The upper end of the lower rod forms a cylindrical second joint, and the center of the second joint forms a cylindrical second hollow part; the upper end of the second joint forms an inwardly protruding second annular edge; the bottom surface of the second hollow part constitutes the upper end surface of the lower rod. The first connecting part is inserted into the second hollow part; when the lower end face of the upper rod and the upper end face of the lower rod separate, the first annular edge can slide and rotate within the second hollow part; the second annular edge is used to prevent the first connecting part from coming out of the second hollow part.

3. The safety-type medullary suture needle according to claim 2, characterized in that: The elastic component includes a spring body and a ball fixed to the lower end of the spring body; the upper end of the spring body is used to abut against the top surface of the first hollow part; the ball is used to abut against the center position of the bottom surface of the second hollow part.

4. The safety-type medullary suture needle according to claim 3, characterized in that: The center of the bottom surface of the second hollow section is a smooth surface; Multiple convex teeth are formed along the lower end face of the upper rod; these multiple convex teeth are distributed in a circular shape. Multiple grooves are formed along the upper end face of the lower rod; these grooves are distributed in a circular pattern. When the pressure on the lower end of the lower rod is greater than or equal to a predetermined value and the spring body of the elastic member is compressed, the plurality of protruding teeth and the plurality of grooves engage together, thereby connecting the upper rod and the lower rod together.

5. The safety-type medullary suture needle according to claim 3, characterized in that: The center of the bottom surface of the second hollow section is a smooth surface; Multiple convex teeth are formed along the lower end face of the upper rod; these multiple convex teeth are distributed in a circular shape. Multiple convex teeth are formed along the upper end face of the lower rod; these multiple convex teeth are distributed in a circular shape. When the pressure on the lower end of the lower rod is greater than or equal to a predetermined value and the spring body of the elastic member is compressed, they engage together, and the multiple protrusions of the upper rod and the multiple protrusions of the lower rod engage together in an alternating manner, thereby connecting the upper rod and the lower rod together.

6. The safety-type medullary suture needle according to claim 4 or 5, characterized in that: Multiple recesses are formed on the outer circumferential surface of the lower rod. These recesses are used to generate a predetermined sound when the lower rod rotates and rubs against the surrounding air, thereby providing the user with objective evidence as to whether the lower rod rotates together with the upper rod.

7. The safety-type medullary suture needle according to claim 1, characterized in that: The lower end of the upper rod forms an upper indicator mark; the upper end of the lower rod forms a lower indicator mark; when the upper indicator mark and the lower indicator mark are aligned, and the lower end face of the upper rod and the upper end face of the lower rod are engaged together, the sleeve can be simultaneously attached to the upper rod and the lower rod.

8. The safety-type medullary suture needle according to claim 6, characterized in that: The recesses are symmetrically distributed on the outer circumferential surface of the lower rod.

9. The safety-type medullary suture needle according to claim 8, characterized in that: The recess is located below the lower limit ring.

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