KR100475269B1 - Bone screw for medical care - Google Patents

Abstract

PURPOSE: A bone screw for medical care is provided to increase the self-drilling, self-tapping and release-preventing function, as well as the wire hauling and screw fastening characteristic, and to overcome the defects of the existing medical screw. CONSTITUTION: The bone screw for a dental correction includes: a screw drilling portion(10); a body portion(20), extended from the drilling portion(10); and a head portion(30), extended from the body portion(20). The drilling portion(10) has a vertex angle of 35 deg. to 45 deg., starting from a center line so as to drill the bone, using the end of the bone screw. A cutting flute is formed from the drilling portion(10) to the body portion(20), and a continuous thread is formed on an outer circumference of the body portion(20), starting from the drilling portion(10). The body portion(20) is twice stepped and tapered so that it has a first and a second body segment. The release torque of a thread, formed on the both portion(10,20), is greater than the insertion torque thereof.

Description

Bone screw for medical care

The present invention relates to an orthodontic screw (screw), and more particularly, orthodontic screw that can be firmly fixed to the gum with a two-stage tapered torso as a screw used for oral orthodontic purposes It is about. In addition, the screw of the present invention may be fastened to the bone in order to securely fix the incision loose bone in the joint surgery by bone fracture. In particular, the screw is fastened for the purpose of oral orthodontic screw self-drill, self-tapping and anti-loosening, and relates to a medical screw for improving the fastening function in the head of the screw.

Medical screws have strong external forces (impacts, etc.) to bond fractured bones in bone fractures, and fractures created in recent rapidly developing medical and cosmetic purposes. When treating the inside of the bone during surgery or surgery for the purpose of treatment, incision, detachment of the external bone, and surgery to fix and fix the bone again after the completion of the treatment, etc. It is a screw to fasten the screw to fix the bone incision with a wire or fastening member.

For example, a primary screw hole is formed with a drill to coincide with a fastening hole position formed on a fastening member (fastener) on both bone surfaces of the incision line, and fastened with a screw penetrating the fastening hole in a state in which the fastening member is laminated thereto. By fixing the incised bones together by fixing the fractured bones in a stable manner and also in the oral orthodontic treatment and treatment by tightening the screw in the oral cavity to orthodontics or dentures.

Thus, a medical screw that is fastened with a holding rod for the purpose of bonding and orthodontic fractured bone has been known a number of invention configurations in and outside the country.

As an example, the present invention filed in Japanese Patent Application No. 2001, No. 59,380, which includes a fastening screw and a countersunk head having a driver insertion hole, wherein the head body and the head are formed under the screw head having the driver insertion hole. Formed to form a django head and the wire fastening hole to the head body to the winding or tow the towing wire.

These screws are very effective in orthodontics. In contrast, US Patent No. 5,797,914, which is a medical screw, A medical procedure screw used for the bones of the oral cavity, skull, etc., and a hollow flute is formed in the body. Be sure to In contrast, another patent 5,925,048 is as described above. The self-drilling function and self-tapping function are composed, and the screw consists of the end part, the body part and the head part. It is composed of angles.

The head part is formed with a driver groove of 90 ° to 120 ° angle to maximize the rotational force, and the thread has a lead angle between 48 ° and 52 ° and a drag angle between 98 ° and 102 ° measured from the screw center line. The two points corresponding to each other of the pitch threads were advanced by the length of the pitch in the axial direction when the screw was rotated once by the distance measured in parallel with the axis.

In this conventional invention, the former has the disadvantage of first drilling a hole of a predetermined size with a drill to fasten the screw to the bone, and then fastening the screw thereto, and the latter to improve the closed end has a tapper at the end of the screw. Although the self-drill function is formed to achieve the self-punching and fastening, but the implementation of the components presented in the present invention, the magnetic drill function is required to generate a very limited action and a lot of rotational force is required. After the fastening is known that the problem of the disadvantage that the reverse rotation, that is, loosening of the screw is easily caused by the impact of shaking, vibration, etc. of the screw.

The present invention aims to increase the traction of the wire and the fastening of the screw together with the self-drilling, self-tapping and anti-rotation prevention functions, and also for the purpose of overcoming deficiencies in the preceding medical screw. Is to provide.

The present invention for achieving the above object is composed of a screw drill and the body and the head.

The drill unit is a self-drilling, self-tapping (tapping) function to achieve the fastening screw is inserted into the hole in the fastening position of the screw.

The body portion is formed with a screw thread formed by the outer periphery of the conical body rod, and the screw thread is composed of a pitch that adjusts the insertion angle and the anti-separation holding angle to prevent the reverse rotation from the vibration of the screw after tightening with ease of fastening. To be formed.

In addition, the head part forms an upper and lower head extended to the upper and lower sides of the extended head to form a driver groove in the upper head, and the wire to the head to fasten the wire fastening hole.

In addition, in another configuration, the wire fastening hole integrally formed with the wire fastening hole is formed in the upper head to facilitate fastening of the wire fastened to the screw, thereby greatly improving workability in medical surgery and convenience of fastening. To increase the more stable surgery to achieve.

Referring to the accompanying drawings of the present invention for achieving the above object will be described in more detail the configuration according to an embodiment of the present invention.

1 is a plan view showing the entire embodiment of the screw of the present invention, Figure 2 (a) is a detailed enlarged cross-sectional view of the drill portion and the body portion of the main portion of the screw of the present invention and (b) is an enlarged explanatory view of the screw thread of the screw.

And (a) (b) of Figure 3 is an enlarged plan view and side view of the head of the first embodiment of the present invention as shown in the present invention is a wire with an anti-loosening function of self-drilling, self-tapping and reverse rotation prevention In order to provide a fastening of the screw with the traction of the screw drill 10 and the body 20 and the head 30 is composed of.

The drill portion 10 is formed as a tip forming a vertex angle (α) between 35 ° to 45 ° angle from the center line (L) so that the end of the screw is drilled in the bone.

The angle has been demonstrated to be an optimal compromise angle in strength and input in the practice of fastening to the bone.

The cutting flute (the long groove cut to help smooth removal of the remover) 11 starts at a position of 0.35-0.45 mm from the vertex end across the drill part 10 and the body part 20 and starts from 3.2 ~. It is cut at a round angle of 2.9-3.2 up to a position of 3.5mm.

The cutting flute 11 cuts and removes the bone fragments by inserting and drilling threads, as known in the conventional self-tapping screw, to induce a smooth external discharge.

The trunk portion 20 is formed with a thread 21 formed on the entirety of the trunk portion 20 from the tap of the drill portion 10, and in particular, the trunk portion 20 has a 0 to 15 ° angle from the center line L. It is composed of a plurality of stages formed of a plurality of stages formed at different angles or otherwise to increase the load distribution and strength by the taper angle 25 of the plurality of stages are different.

The thread 21 formed on the outer circumferential surface of the multi-stage tapered rod of the trunk portion 20 discharges the bone fragments generated from the screw insertion and the drill to the outside and maximizes the coupling force between the screw and the screw. Insertion angle 22 of 35 ° to 45 ° and 10 ° to 20 ° holding angle (23) from the vertical angle of the screw center line (L) to ensure that the fastened screw is provided with the reverse rotation prevention and loosening prevention function. ).

The screw thread 21 of the present invention is configured to be easy to rotate and fasten with a small force and to have a higher holding force in preparation for vibration or external shock and a higher loosening torque than the insertion force.

The pitch 26 of the thread 21 has a pitch of 40 to 50% with respect to the outer diameter of the screw, and a thread height of 13 to 25% is appropriate.

The shape of the upper head 32 is processed into a hexagonal to configure the driver groove 33 and the driver groove of the hexagonal groove of the entire screw "하도록" groove to improve the convenience of use.

The head part 30 has a head body 31 extended from the body part 20 and upper and lower heads 32 extended to the upper and lower sides of the head body 31 as shown in (a) and (b) of FIG. 3. (32-1), but not shown in the upper head 32 to form a driver groove 33 and the head body 31 through the wire fastening hole 34 through the head body 31 Make a fastening of.

In addition, as shown in Figure 3 (c) plate-shaped, that is, the lower head 32-1 is composed of a plate-shaped lower head 32-2 perpendicular to the body portion and the skin in close contact with the lower head It is possible to prevent the accumulation of foreign matter to prevent the accumulation of space, and this embodiment is often used in orthodontic use.

And in another configuration, Figure 4 (a) (b) is an enlarged plan view and side view of a second embodiment of the head of the present invention, Figure 5 is an enlarged view of a third embodiment of the head of the present invention As described above, the wire fastening hole 34 is integrally connected to the upper head 32 to form a perforated wire inserting portion 35 to facilitate fastening of the wire fastened to the screw. It is the invention of the configuration to achieve a more stable surgery by greatly improving the convenience of fastening, and alternatively can be composed of a conventional dish head and can also have a configuration that varies the size of the upper and lower heads, of course to be.

Referring to the effects of the present invention made of the above configuration in more detail as follows.

1 is a plan view showing the entire embodiment of the screw of the present invention, Figure 2 (a) is a detailed enlarged cross-sectional view of the drill portion and the body portion of the main portion of the screw of the present invention and Figure 2 (b) is an enlarged screw thread of the screw Figure 3 (a) (b) is an enlarged plan view and side view of the head of the first embodiment of the present invention, as shown above the screw according to the present invention is a two-stage of the bone by the external force action 스크류) It is a screw that is fastened to both sides starting from the incision line of the joint to fix the bone in the purpose of treatment in bone fracture (fracture, 등), etc.

Such a screw is involved in life, and therefore, fast and precise fastening is desired and convenience of fastening is required.

Therefore, in the present invention, the screw is fastened and inserted while forming a hole in the bone, such insertion is easy, and also to prevent the fastening and loosening after fastening.

The present invention is in close contact with the fastening member (fastener; fastenerS) formed on both sides of the incision line is loose bone and fasten the screw of the present invention to the fastening hole formed therein.

Or in orthodontics, such as bone relaxation is used as a support by fastening the screw to the support.

In the fastening of such a screw, the present invention inserts a driver (not shown) into the driver groove 33 so as to be located at the bone of the surgical screw fastening position to rotate clockwise.

Accordingly, the screw is fastened while drilling at the vertex of the drill portion 10 having a sharp and high strength without a drill hole in the bone.

The vertex angle at this time forms an angle of 35 ° to 45 ° starting from the center line (L), so that the fast drilling function is exerted on the bone without slipping from the surface of the bone.

The angle has been proved to be the optimum compromise angle in the practice of fastening to the bone, and thus can be fastened by the drilling of the screw itself without a separate drill hole, so the risk of shortening the procedure and the expected risk during drilling To improve the effect is exerted.

At this time, the cutting flute 11 of the drill part 10 is cut at a round angle of 2.9-3.2 starting from a position point of 0.35-0.45mm from a vertex end to a position of 3.2-3.5mm, thereby removing bone fragments by initial drilling. After cutting and removing, the discharge and smooth insertion of the thread 21 is induced.

The screw fastened by the above is formed with a thread 21, the trunk portion 20 of which is formed in the whole of the trunk portion 20 from the vertex of the drill portion 10, in particular the trunk portion 20 is the center line ( L) is composed of a taper angle 25 formed of two to three stages and more than two stages with 0 to 15 ° angle, thereby increasing the load distribution and strength by the multiple stages. As shown in FIG. 2A, when the taper angle 25 is formed in two stages, the first trunk portion close to the drill portion 10 may have an inclination angle smaller than the inclination angle of the drill portion so as to increase load distribution and strength. The second body portion close to 30) is formed to have an inclination angle smaller than the inclination angle of the drill portion 10 and larger than the inclination angle of the first body portion. The closer the torso 20 is to the head 30, the larger the diameter is, so that the screw can be more firmly fixed to the gum.

The taper and the thread 21 formed on the outer circumferential surface of the tapered rod in this multi-stage allow the bone fragments generated from the screw insertion and the drill portion to be discharged to the outside and maximize the coupling force between the screw and the screw. The fastening screw is to improve the anti-rotation loosening prevention function.

That is, from the vertical angle of the screw center line (L), the screw thread constitutes the insertion angle 22 of 35 ° to 45 °, thereby forming an insertion angle in which the screw can be more easily fastened to the rigid bone, and also preventing the separation after the fastening. To prevent loosening, the screw is held by holding the holding angle 23 between 10 ° and 20 °, so that the screw is fastened by the taper and the reverse rotation is prevented by the engagement between the insertion angle and the holding angle. This was to be prevented.

This configuration allows the screw thread 21 to be rotated and fastened with a small force, and is configured to have a higher retaining force than the insertion force in preparation for vibration or external shock.

At this time, the thread 26 pitch 26 is composed of 40 to 50% with respect to the outer diameter of the screw, the thread height is 13 to 25% is suitable, and the holding force is exerted in response to the reverse rotation loosening of the fastened screw.

The head 30 for rotating the screw or for fixing the wire has a head body 31 extended from the body part 20 and an upper and lower head 32 extended to the upper and lower sides of the head body 31 ( 32-1).

The upper head 32 has an alternative to "━" or "╋" It is preferable to form the driver groove 33 of the " type and the driver groove 35 is selected and configured according to the use.

And the head body 31 is a plan view and a side view of Fig. 3 (a) (b) which is an enlarged plan view and a side view of the head of the first embodiment of the present invention and an enlarged view of a second embodiment of the head of the present invention As shown in (a) (b) of FIG. 4 and in an enlarged view of the third embodiment of the head of the present invention, the wire fastening hole 34 penetrating through the head body 31 is not shown in orthodontics. The wire insertion part 35 connected to the wire fastening hole 34 is formed to facilitate the fastening of the wire, thereby facilitating the fastening of the wire fastened to the screw, thereby greatly improving workability and convenience in medical surgery. Increased to achieve a more stable surgery.

Meanwhile, when the present invention is used in orthodontics, the wire is fastened to the screw head of the present invention, in which the plate-shaped lower part shown in FIG. 3 (c) is used to prevent space formation between the lower head and the skin. It may have a head (32-2).

This configuration is that the lower head (32-1) is composed of a plate-shaped lower head (32-2) perpendicular to the body portion to prevent the accumulation of foreign matter by preventing the occurrence of space between the skin and the close contact with the lower head Often used in orthodontics.

In the present invention, the wire insertion hole 34 is formed by pulling the wire through the wire fastening hole 34 formed in the head 30 of the screw, or in the ring-shaped wire, by using the screw constituting the wire insertion portion 35. 35), the wire can be inserted to fix the wire.

It is obvious that orthodontic springs may be used with the wires as described above, or alternatively, may be used.

Alternatively, the conventional dish head may be configured, and may also have a configuration that varies the size of the upper and lower heads, and of course, the head part 30 may include any one of the upper and lower heads along with the double head of the upper and lower parts according to the use and the treatment position. It is possible to configure a screw consisting of only the head and this implementation can be changed depending on the intended use of the screw will be in a simple embodiment of the present invention.

The present invention relates to a screw that is fastened to the bone in surgery, such as orthodontics, bone relaxation, in particular the present invention provides a function of traction of the wire, screw fastening with the function of preventing loosening of self-drilling, self-tapping and reverse rotation prevention In order to improve and to overcome the defects in the preceding medical screw, the present invention consists of a screw drill, a body and a head, consisting of a titanium alloy, a chromium cobalt alloy and a polymer of a material having high durability and high strength and durability Exerted.

The drill part is a self-drilling, self-tapping function to effect the fastening of the screw is inserted into the bone at the fastening position of the fastening position and the body portion is threaded by the outer circumference of the conical body rod is formed Is composed of a pitch adjusted by the insertion angle and the holding angle. The fastening prevention function is achieved to prevent reverse rotation in the shaking vibration of the screw after fastening together with the ease of fastening, and the head part comprises an extended upper and lower head on the upper and lower sides of the extended head. To form a driver groove in the upper head, and to connect the wire by drilling a wire fastening hole in the head body, and to form a wire fastening unit integrally formed with the wire fastening hole in the upper head to facilitate the fastening of the wire fastened to the screw. This greatly improves the workability in medical surgery and the convenience of tightening. The invention allows one to achieve a more stable operation.

1 is a plan view showing the whole embodiment of the screw of the present invention.

Figure 2 (a) is a detailed enlarged cross-sectional view of the drill portion and the body portion of the critical part screw of the present invention.

(b) is an enlarged explanatory view of the screw thread.

Figure 3 (a) (b) is an enlarged plan view and side view of the head of the first embodiment of the present invention.

Figure 3 (c) is an explanatory view of another embodiment of the head of the present invention.

Figure 4 (a) (b) is an enlarged plan view and side view of another second embodiment of the head of the present invention.

5 is an enlarged view of the third embodiment of the head of the present invention.

* Explanation of Signs of Major Parts of Drawings *

10; A drill part 11; Cutting flute 20; Torso

21; Thread 25; Taper angle 22; Insertion angle

23; Retention angle 26; Pitch 30; Head

31; Torso 32; Upper head 32-1, 32-2; Lower head

33; Driver groove 34; Wire fastener 35; Wire insert

a; Vertex L; Centerline

Claims (7)

delete delete delete In the orthodontic screw comprising a screw drill portion 10, a body portion 20 extending from the drill portion 10, and a head portion 30 extending from the body portion 20, The drill unit 10 has a vertex angle α in a range of 35 ° to 45 ° starting from the center line L so that the end of the screw is drilled into the bone, and the drill unit 10 and the trunk part 20 are formed. Cutting fruit is formed over) The trunk portion 20 has a continuous screw thread formed on the outer circumferential surface of the trunk portion from the drill portion 10, and has a first shaft portion having an inclination angle smaller than the inclination angle of the drill portion with respect to the center line of the screw and a central axis of the screw. Tapered in two stages so as to include a second body portion having an inclination angle smaller than the inclination angle of the drill portion 10 and larger than the inclination angle of the first body portion, The thread formed in the drill portion and the trunk portion 20 includes an insertion angle 22 within a range of 35 ° to 45 ° with respect to the vertical angle of the central axis of the screw so that the loosening torque of the screw is larger than the insertion torque, and 10 ° to 20 °. Orthodontic screw, characterized in that the holding angle 23 in the range formed. The method of claim 4, wherein The head part 30 includes a head body 31 extending from the body part 20 and upper and lower heads 32 and 32-1 extending on the upper and lower sides of the head body 31. The head body 31 is formed to penetrate the wire fastening hole 34, the upper head 32 is formed with a driver groove, the lower surface of the lower head (32-1) to taper to the body portion Orthodontic screw, characterized in that formed. The method of claim 4, wherein The head part 30 includes a head body 31 extending from the body part 20 and upper and lower heads 32 and 32-1 extending on the upper and lower sides of the head body 31. The upper head 32 has a wire insertion portion 35 formed to communicate with the wire fastening hole 34, the lower surface of the lower head 32 is perpendicular to the body portion 20, the outer peripheral surface of the driver Orthodontic screw, characterized in that the angle is formed so that the rotational force is inserted into the. The method according to claim 5 or 6, The pitch of the thread 21 is in the range of 40 to 50% of the outer diameter of the screw, the height of the thread 21 is in the range of 13 to 25% of the screw outer diameter of the screw.