TWI593379B - Microporous fixing screws - Google Patents

Description

Micro-hole fixing screw

The invention relates to a fixing screw with micropores, in particular to a screw segment of a fixing screw, which comprises a microporous layer composed of a plurality of microbeams having a plurality of micropores.

The fixing screws currently used in orthopedics or dentistry are usually integrally formed by mechanical processing of metal rods. The surface of such conventional fixing screws is composed of very tight metal atoms, and the gap between atoms is extremely small. The smooth metal surface, because the new bone tissue has a particle size of about 50 μm , when the fixing screws are locked into the bone body, the new bone tissue cannot be embedded in the gap between the metal atoms, so the conventional fixing screw is locked. After being inserted into the bone, it can only be combined with the friction between the fixation screw and the bone body. It cannot be truly integrated with the bone body. When the bone body moves, the fixing screw fixed on the bone body is subjected to huge external force. It is easy to cause sloshing in the bone, and it is loose, which is especially likely to occur in patients with loose bones.

Therefore, there is a method of chemical etching to form a plurality of uneven or rough surfaces on the surface of a conventional fixing screw, so that the new bone tissue can be attached to the uneven or rough surface. However, the above-mentioned fixing screw, the new bone tissue can only adhere to the outer surface of the fixing screw, can not be deeply embedded in the fixing screw, and can not achieve the purpose of truly integrating with the bone body.

In addition, in U.S. Patent No. 5,098,834, a porous coating is applied to the outer surface of the fixing screw by a coating method, so that the fixing screw has a porous surface. In order to facilitate the insertion of the new bone into the hole, the conventional fixing screw must be coated with an additional coating, which not only increases the manufacturing process but also increases the manufacturing cost. In addition, the new bone tissue cannot penetrate into the fixing screw. Still can not achieve the purpose of integration.

In view of this, the inventors of the present invention have invented the innovation and disclosed the microscopy fixing screw of the present invention.

The purpose of the present invention is to provide a fixing screw with a micro hole, comprising: a screw segment and a screw head at one end of the screw segment, the screw segment comprising a rod portion and a screw threadedly formed on the rod portion Wherein the screw segment has at least one region, wherein the plurality of microbeams form a microporous layer having a plurality of micropores, and the stem portion is axially formed without micropores within a radius along its axis If the fixing screw is locked into the bone body, the new bone tissue can be embedded in the plurality of micropores of the microporous layer of the screw segment, so that the fixing screw and the bone body are firmly combined and integrated.

The fixing screw with micropores disclosed in the present invention is axially penetrated through a guiding hole to allow a guiding cable to penetrate, so that the present invention can be guided by the guiding cable in minimally invasive surgery. Accurately lock the set screw into the desired position. The above-mentioned guide hole is axially penetrated through the screw head and the mandrel portion of the screw segment.

The fixing screw with micropores disclosed in the present invention can be directly integrated into the fixing screw by a 3D printer, or can be manufactured as a semi-finished product by conventional machining, and then completed by a 3d printer on a semi-finished product. The microporous layer, the invention is not limited by its manufacturing method.

The present invention discloses a micro-hole fixing screw, wherein the micro-porous layer is formed only in The rod portion of the screw segment; or the microporous layer is formed on the outer layer of the rod portion of the screw segment and the screw portion.

The fixing screw with micropores disclosed in the present invention is such that a rib having no micropores is formed between the screw portion and the mandrel portion.

The invention discloses a fixing screw with a micro hole, wherein a screw head of the fixing screw is integrally formed with a screw segment; or a screw head of the fixing screw is provided with a bowl hole, and a screw surface is provided at a top end of the screw segment; The spherical surface is placed in the bowl of the screw head so that the screw head and the screw segment can swing freely.

The present invention discloses a micro-hole fixing screw, wherein a top end of the screw head of the fixing screw is recessed with an engaging hole, and the engaging hole can fasten a pressing member to tightly seal the engaging hole and the pressing member. The one of the opposite side walls of the above-mentioned connecting hole is respectively provided with a buckle groove, and the pressing member comprises a pressing plate which can be placed in the engaging hole and pressed against the implant And a gusset plate is pivotally mounted on the pressing plate, so that the gusset plate can be rotated by a wrench or a screwdriver, and the two side edges thereof respectively extend into the buckle grooves of the engaging holes on both sides to block the The plate is withdrawn outwardly and the implant can be locked into the engagement pocket.

The present invention discloses a micro-hole fixing screw, wherein a front row of the screw section is recessed with a row of slots, so that one side of the cutting groove forms a cutting edge, so that the invention can form a self-tapping screw, which can be directly borrowed Locked into the bone by rotation.

The micro-hole fixing screw disclosed in the present invention can shape the screw portion by a mold after molding, so that the surface of the screw portion forms a flat surface.

The micro-hole fixing screw disclosed in the invention has a micro-hole formed by a plurality of micro-beams, and has a pore diameter of between 100 and 500 μm , which is suitable for the growth of new bone tissue into each micro-hole, so that The fixing screw can be tightly integrated with the body to be locked, so that it does not loosen. In order to improve the metal screws made by conventional mechanical machining, the bone tissue cannot be embedded in the shortcomings of growth.

The desirable entities of the present invention can be clarified by the following description and the accompanying drawings.

(10)‧‧‧ fixing screws

(11)‧‧‧ Screw head

(11a) ‧‧‧ Bowl

(111)‧‧‧Connecting points

(111a) ‧‧‧ buckle groove

(112)‧‧‧Sold parts

(112a) ‧‧‧ Pressing board

(112b)‧‧‧

(113) ‧‧‧ Tightening bolt

(12a) ‧ ‧ spherical face

(12)‧‧‧ Screw section

(120)‧‧‧ mandrel

(121)‧‧‧ Body

(122)‧‧‧ Threading

(123a)‧‧‧Microbeam

(123)‧‧‧Microporous layer

(123b)‧‧‧Micropores

(124)‧‧‧ ribs

(13) ‧‧‧ Guide holes

(20)‧‧‧Bone

(201)‧‧‧ sponge bone

First Figure: is an exploded perspective view of a first embodiment of the present invention.

Second figure: is a perspective view of the embodiment of the first embodiment shown in the first figure.

The third figure is a three-dimensional diagram of the pressed piece after locking the second figure.

Figure 4 is a partially enlarged schematic view of the screw section of the present invention.

Fig. 5 is a schematic view showing the locking of the screw segment of the present invention into the bone body.

Figure 6: Schematic diagram of a partial cross-sectional structure in the direction of the sixth figure 6-6.

Figure 7: Schematic diagram of a partial cross-sectional structure in the direction of Figure 7-7 of the third figure.

Figure 8 is a partial cross-sectional structural view showing a second embodiment of the present invention.

Figure 9 is a partial cross-sectional structural view showing a third embodiment of the present invention.

Figure 10 is a partial cross-sectional structural view showing a fourth embodiment of the present invention.

Figure 11 is a partial cross-sectional structural view showing a fifth embodiment of the present invention.

Referring to Figures 1 to 7, the present invention relates to a micro-hole fixing screw (10) having at least one region formed by a plurality of micro-beams (123a) having a plurality of micro-holes ( 123b) The microporous layer (123), after the fixing screw (10) is locked into the bone body (20), the new one The bone tissue can be embedded in the plurality of micropores (123b) of the microporous layer (123), and the fixation screw (10) and the bone body (20) are firmly integrated into one body.

The fixing screw (10) with micropores disclosed by the invention comprises: a screw section (12) And a screw head (11) located at one end of the screw section (12), wherein the screw section (12) comprises a rod body portion (121) and a screw portion (122) spirally wound and formed on the rod body portion (121) Wherein the microporous layer (123) is formed only on the outer layer of the rod portion (121) of the screw segment (12), or on the outer layer of the rod portion (121) of the screw segment (12) and the thread Department (122).

The present invention discloses a micro-hole fixing screw (10), as shown in the fourth figure, wherein Each of the plurality of microbeams (123a) is arranged in a diamond shape, a rectangular shape, a honeycomb shape, a radial shape, an irregular shape, etc., and is formed on the screw segment (12) to form a stable and multi-microporous (123b) The microporous layer (123) structure, the present invention does not limit the arrangement of the microbeams (123a). Further, each of the microbeams (123a) may have a cross-sectional shape such as a circular shape or a polygonal shape, and the present invention is not limited.

As shown in the seventh figure, the present invention discloses a micro-hole fixing screw (10), wherein The screw segment (12) has at least one region, and the microporous layer (123) having a plurality of micropores (123b) is formed by a plurality of microbeams (123a), and the stem portion (121) is in a state along its axis Within the radius, axially forming the mandrel portion (120) without micropores, after the fixing screw (10) is locked into the bone body (20), the new bone tissue can be embedded in the screw segment (12). In each of the micropores (123b) of the microporous layer (123), the fixing screw (10) and the bone body (20) are firmly integrated into one body, and the core shaft portion (120) without the micropores is strengthened. The structure of the invention.

As shown in the eighth and ninth figures, the micro-hole fixing screw (10) disclosed by the present invention, Only in the front section of the screw section (12), a microporous layer (123) composed of a plurality of microbeams (123a) is formed, and the other part of the screw section (12) is a structure having no micropores. As shown in the eighth figure, make this The fixing screw (10) shown in the invention, when locked into the bone body (20), has a front section of the screw section (12) of the microporous layer (123), which can penetrate into the sponge bone inside the bone body (20) (201, spongy In the bone, the bone tissue can be smoothly embedded in the micropores (123b) of the present invention in the microporous layer (123) in the front section of the screw section (12) to closely fit the screw section (12). ) integrated into the bone body (20), while the other parts of the screw section (12) without the microporous layer (123) structure can provide stronger mechanical strength to withstand greater torque In order to avoid breakage of the fixing screw (10) when it is locked into the bone body (20).

As shown in the ninth figure, the micro-hole fixing screw (10) disclosed in the present invention, the shaft A guiding hole (13) is penetrated through the ground for allowing a guiding cable to penetrate, so that the minimally invasive surgery can accurately lock the fixing screw (10) by guiding the guiding cable. Enter the intended location. The above-mentioned guide hole (13) is axially penetrated through the screw head (11) and the mandrel portion (120) of the screw segment (12).

As shown in the tenth figure, the micro-hole fixing screw (10) disclosed in the present invention A non-microporous rib (124) is formed between the threaded portion (122) and the mandrel portion (120) of the rod portion (121) to enhance the torsion that the present invention can withstand.

The fixing screw (10) with micropores disclosed in the present invention can be made of metal powder by Laser sintering [such as 3D Printer], or after manufacturing as a semi-finished product by traditional machining, and then using the 3D Printer to complete the microporous layer (123) on the semi-finished product, the present invention does not Self-limited manufacturing methods.

The micro-hole fixing screw (10) disclosed in the present invention can be formed by molding The mold reshapes the threaded portion (122) such that the surface of the threaded portion (122) forms a flat surface to reduce the resistance when locked into the bone (20).

The fixing screw (10) with micropores disclosed in the invention can be made from titanium and Gold ... and other metal materials, the invention is not limited to its material.

The present invention discloses a micro-hole fixing screw, which is composed of a plurality of micro-beams (123a) The microporous layer (123) having a plurality of micropores (123b) is formed such that each of the micropores (123b) is between 100 and 500 μm so that the new bone tissue can enter the micropores of the microporous layer (123). The growth in (123b) allows the fixing screw (10) to be tightly integrated with the locked body (20) so as not to loosen or shake.

The micro-hole fixing screw (10) disclosed in the present invention is as shown in the first figure, wherein The screw head (11) and the screw section (12) can be integrally formed as a fixed screw; or as shown in FIG. 11, the screw head (11) is provided with a bowl (11a), and the screw The top end of the segment (12) is provided with a spherical surface portion (12a), and the spherical surface portion (12a) is placed in the bowl (11a) of the screw head (11) to make the screw head (11) and the screw portion ( 12) Free swingers.

The present invention discloses a micro-hole fixing screw (10), wherein the screw head (11) is A recess having a polygonal outline or having a polygonal shape may be formed, or a cross or a groove may be recessed to rotate the wrench or the driver, and the present invention is not limited to the shape of the screw head (11).

The present invention discloses a micro-hole fixing screw (10), wherein the screw head (11) is It can be used to lock or fasten an implant (30) such as a connecting rod, a spring rod, a connecting rod, etc., as shown in the first figure, wherein the top end of the screw head (11) of the fixing screw (10) An engaging hole (111) is provided in the recess, and the engaging hole (111) can fasten a pressing member (112) to fasten the implant between the engaging hole (111) and the pressing member (112) ( 30).

As shown in the first figure, on the opposite side walls of the above-mentioned engagement hole (111), the system is divided into A pressing groove (111a) is provided, and the pressing member (112) comprises a pressing plate (112a), and the pressing plate (112a) can be placed in the engaging hole (111) [as shown in the second figure], Squeezed on the implant (30), and The pressing plate (112a) is pivotally mounted with a gusset plate (112b), so that the gusset plate (112b) can be a wrench or a screwdriver, and the gusset plate is rotated as shown in the direction of the third figure (R). The two side edges of (112b) respectively extend into the two sides of the engaging hole (111) in the buckle groove (111a) [as shown in the third and fifth figures] to block the pressing plate (112a) from exiting outward, and The implant (30) can be locked into the engagement pocket (111).

As shown in the ninth figure, the aforementioned engaging hole (111) can also be modified to form an internal snail. a hole for locking a pressing bolt (113), by which the pressing bolt (113) is pressed and fixed in the engaging hole (111); the structure and shape of the screw head (11) of the present invention, The present invention may be other shapes or configurations, and is not limited to the embodiments disclosed above.

The fixing screw (10) with micropores disclosed by the invention has the end of the screw section (12) At the end, a row of slots (15) can be recessed, so that one side of the slot (15) forms a cutting edge to form a self-tapping screw.

The micro-hole fixing screw (10) disclosed in the invention can be applied to the fixing of the gum Fixation, fixation of the human spine, fixation of bones in other parts, the invention is not limited to its application range.

The micro-hole fixing screw (10) disclosed by the present invention is mainly characterized by a snail At least one region of the rod segment (12) is provided with a microporous layer (123) composed of a plurality of micro-beams (123a) having a plurality of micropores (123b), so that the new bone tissue can be not only in the screw section in contact therewith (111) The micropores (123b) on the outermost surface are grown, and can be further grown in the micropores (123b) of the mandrel portion (120) region of the screw segment (12) to make the new bone tissue As if the packing is inserted into the screw section (12) of the fixing screw (10), the purpose and effect of the fixing screw (10) and the bone body (20) are integrally combined to avoid the fixing screw (10). Loose or shaken.

The structure and shape disclosed in the present invention can be used without departing from the spirit and scope of the present invention. The invention is modified and the invention is not limited.

(10)‧‧‧ fixing screws

(11)‧‧‧ Screw head

(111)‧‧‧Connecting points

(112)‧‧‧Sold parts

(112a) ‧‧‧ Pressing board

(112b)‧‧‧

(12)‧‧‧ Screw section

(120)‧‧‧ mandrel

(121)‧‧‧ Body

(122)‧‧‧ Threading

(123)‧‧‧Microporous layer

Claims (9)

A fixing screw with a micro hole, comprising: a screw segment and a screw head at one end of the screw segment, the screw segment comprising a rod body portion and a screw portion spirally formed on the rod body portion; wherein the screw portion The screw segment has at least one region, wherein the plurality of microbeams form a microporous layer having a plurality of micropores, and the rod body portion forms a mandrel portion having no micropores in a radius along a central axis thereof; wherein the fixing The screw extends axially through a guiding hole such that the guiding hole extends axially through the screw head and the screw segment. The fixing screw with micropores according to claim 1, wherein the microporous layer is formed on the outer layer of the shaft portion of the screw segment and the screw portion. The micro-hole fixing screw according to claim 1, wherein a rib without micropores is formed between the thread portion and the mandrel portion. The fixing screw according to claim 1, wherein the microporous layer having a plurality of micropores is formed by a plurality of microbeams, and each of the micropores is between 100 and 500 μm. The fixing screw with a micro hole according to claim 1, wherein the screw head is integrally formed with the screw segment. The fixing screw according to claim 1, wherein the screw head is provided with a bowl hole, and a top surface of the screw section is provided with a spherical surface, and the spherical surface is placed in the bowl of the screw head, so that the The screw head and the screw segment are free to swing. The fixing screw with a micro-hole according to claim 1, wherein a top end of the screw head of the fixing screw is recessed with an engaging hole, and the engaging hole is fastened with a pressing member for the connecting hole and the pressing part. Fastening an implant; the opposite side walls of the engaging hole are respectively provided with a buckle groove, and the pressing member comprises a pressing plate, the pressing plate can be placed in the engaging hole, and the pressing The plate pivot is provided with a gusset plate, so that the gusset plate rotatably extends the two side edges into the connection The sides of the hole are buckled in the groove. The micro-hole fixing screw according to claim 1, wherein the end of the screw segment is recessed with a row of slots, so that one side of the cutting groove forms a cutting edge to form a self-tapping screw. The fixing screw according to claim 1, wherein the screw head has a polygonal shape; or the screw head has a polygonal recess or a groove.