MXPA97001193A

MXPA97001193A - Point of co

Info

Publication number: MXPA97001193A
Application number: MXPA/A/1997/001193A
Authority: MX
Inventors: D Galitzer Barry
Original assignee: Howmedica Inc
Priority date: 1996-02-16
Filing date: 1997-02-14
Publication date: 1997-08-01

Abstract

The present invention relates to an apparatus comprising a non-grooved self-penetrating and self-positioning cutting tip, located on a threaded member of substantially cylindrical shape having an axis, said apparatus being characterized in that it comprises a multi-face tip located adjacent to a plurality of threads that includes an uninterrupted thread immediately adjacent said tip and at a distance between two adjacent threads equal to a pitch p and a number of curved faces that is at least 3, said faces are disposed around a single thread. circumference of the intercepted thread, resulting in a free space incorporated for splinters, for the splinters generated during cutting and resulting in an entire, complete and interrupted thread immediately adjacent to said spike

Description

CUTTING POINT BACKGROUND OF THE INVENTION The present invention relates, in general, to a cutting tip for use in any threaded member (or non-threaded member) and to a process for manufacturing < to the cutting tip, the invention relates, in particular, to a coring knife that is especially useful in a suture orthopedic anchor (where a large number of threads in a short thread is desired). distance). In the prior art, there is a wide variety of designs for cutting points. In the field of orthopedics, it is very important to drill holes in bones and tissues. An example of a design for use in advantageously drilling holes in the bones is a bolt traded by Ho inedica and identified as per-no ApexR. In the U.S. Patent No. 4,978,350, which is incorporated herein by reference, describes and claims transcutaneous bolts that can pass through meat and bone and provide a bore (ie, a puncture) of very high quality. Despite the existence of these and other types of devices that have a variety of cutting tips, it has been tried to obtain another point of cor + e that has come + to as particular, These advantages include being able to be manufactured easily, that they are au + o-punzan + es (that is, that they have their own thread), auto-t rans (is decii, that they do not require that another device is introduced beforehand to make a hole),? t? -possible ( that is, they maintain their position after insertion), especially suitable for use as a cutting tip in a suture anchor or soft tissue anchor with a large number of threads located in a short distance and having made the maximum number of full threads, as well as other advantages compared to the cutting tips already known from the prior art. An object of this invention consists of a self-penetrating and already-positionable tip suitable for use as a tip of any threaded member, including for example a suture anchor, a stopper, a drill bit, a reamer, a screw and? n bolt, with the tip having a free space for skiing and neo rpo i 'do. Another object is a cutting tip suitable for use on a bolt without threads. Still another object of this invention is a cutting tip that has many advantages and that is easy to manufacture. A further object of this invention is a method for manufacturing a self-penetrating and self-positioning tip which is very easy to manufacture in a single operation and which is especially useful as a tip in a suture anchor, so that produce a self-piercing and self-piercing suture anchor with an a-to-posic onable tip and uto-onet mt .. Another object of the invention consists of a cutting point produced by means of a new procedure. of making a self-penetrating tip and self-posable, easily operable.

BRIEF DESCRIPTION OF THE INVENTION According to the invention, a new cutting tip which is self-penetrating and self-positioning comprises a non-grooved cutting tip having curved faces concave shape and a first full, uninterrupted thread (located adjacent to the cutting tip) and which is suitable for use as a tip for any threaded member. Furthermore, according to the invention, the new cutting tip of the invention is the cutting tip for a suture passage, a plug, a screw and a bolt (either with or without thread). Also, according to the invention, the cutting tip of the invention has no grooves (which result in partial threads without interruption when the tip is placed on a threaded member), but which on the contrary, has a plurality of curved faces (as opposed to flat faces) that are concave in shape; and that it may be the cutting tip of any threaded member or of an unthreaded bolt. Also, according to the invention, a method of forming the cutting tip of the invention in a threaded member having a pitch p, comprises; (a) maintain a threaded member that has a central axis, in a first stationary position; (b) locating at the end of the threaded member, during a first inclined part, moving a reamer milling tool (having a radius r) with respect to and toward the central ee of the threaded member, as The final compensation distance of the flushing reamer with respect to the threaded member is approximately equal to the radius r of the flushing bur, thus forming a first curved face at the cutting tip, (c) rotating the threaded member a first angle x with respect to the first stationary position, fixing the threaded member, and then making a second inclined cut as in step (b), above: (d) rotating the threaded member a second angle w with respect to the first stationary position, fixing the member and then make a third inclined cut In a preferred embodiment of the method of the invention, the angle or is approximately 120 ° and three curved carriages are made on the cutting tip. it is about 90 ° and a fourth inclined cut is made, as described above, four faces on the short unt; and if the angle is approximately 75, and five inclined cuts are made, five curved faces are obtained on the cutting tip. Furthermore, according to the invention, a new cutting tip is obtained by the method of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side plan view of a preferred embodiment of a cutting tip of the invention that has actually been manufactured, located on a threaded member, this embodiment having in particular three concave curved faces. Also shown are dashed lines (indicating a cross section of a cutter that is also cited as a reamer cutter tool and used to form the cutting tip). Figure 2 is a side plan view of the cutting tip of Figure 1, in which the threaded member is (in a particular, preferred embodiment) a suture anchor. Figure 3 is an enlarged side plan view of the cut-off point of Figures 1 and 2, showing a 3-side cutting tip of an embodiment of the invention that was formed by the method of the invention, with the cutting tip rotated as it is inserted in a clockwise direction, an angle of about 240 ° compared to those in Figures 1 and?. Figure 4 is an end view of the cutting tip of Figure 3, facing in front of the end of the tip, showing three faces and a remaining part of the thread that was part of the original thread of the threaded member with before the tip was manufactured, having been used the original thread to form the cutting tip of the same. The Figure is a cross-sectional view taken along line 5-5 of Figure 4. Figure 6 is a cross-sectional view taken along line 6-5 of Figure 4. Figure 7 is an execution of the design of an extreme view of a modality of a cutting tip of the invention that has four faces, as seen facing the end of the tip. Figure 8 is an interpretation of the drawer of extreme view of a modality of a cutting tip of the invention that has five faces, as seen looking straight towards the ex emo of the tip. Figure 9 is a side plan view of an embodiment of the cutting tip of the invention in an unthreaded bolt, the end of the cutting tip being blunt cut. Figure 10 is a side plan view of an ApexR bolt embodiment (which constitutes Figure 1 of U.S. Patent 4,978,350), which renders < -t is grooves that have been used in the prior art, in contrast to the non-grooved cutting tip of the present invention. Figures 11-15 are photographs and enlargements, indicative of a preterred form of a cutting tip of the invention, which was manufactured with three faces. Figure 1 (photograph i) corresponds substantially to Figures 1 and 2, but with the end of the tip pointing to the left instead of to the right. Figure 12 (photograph 2) corresponds substantially to Figure 3, but with the end of the tip pointing to the left instead of to the right. Figure 13 (photograph 3) substantially corresponds to Figure 4. Figure 14 (photograph 4) also corresponds substantially to Figure 4, but with the tip rotated prow clockwise substantially 270 °. Figure 15 (photograph 5) shows the cutting tip and the beginning of the first full, uninterrupted thread, adjacent to the cutting tip, with the different radii clearly apparent.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Referring to the drawings, Figure 1 shows a modality of a cutting tip 10 of the invention having three faces, according to a plan view, as seen laterally facing a face 25. The tip 10 of Cor-te is preferably located on a threaded member 12 (as opposed to an unthreaded member). In Figure 2, the threaded member 12 of Figure 1 is (in a particular preterm embodiment), a suture anchor 14 having a tip end 15 (as in Figure 1) and a second ex-pad 18, to which a suture (not presented) could be fixed in any suitable way. The threaded member 12 of Figures 1 and 2 possesses a central axis 20, a number of threads 22 (which can be chosen - as desired), and a tip end 15. Between two adjacent threads 22, a step 24 is present. The cutting tip 10 of the invention has a plurality of concave faces. In a preferred embodiment, there are three such faces, one of whose faces 26 is shown in Figure 1 and Figure 2. No groove or grooves (which are similar to grooves and examples of which are depicted) are present. in Figure 10) in cutting tip 10 of the invention. It will be appreciated that the result of a groove is a plurality of interrupted threads, including an interrupted thread 27 located adjacent the end of the tip. See Figure 10. However, at the cutting tip 10 of the invention, when the tip 10 is placed on threaded member 12, the faces are rolled toward (and from)? N thread (a part 40 of which remains and is visible); and the thread 27 located adjacent to the LO tip is completely complete and without interruption. One or more threads can be used to make the cutting tip of the invention. The greater number of threads that can be eliminated will have a length equal to the radius of the cutter. Also shown in Figures 1 and 2 (dotted lines) is a cross section of a cutter burr cutting tool 28 (also called a cutter), which is used in the preferred process of the invention to form the cutter tip of the cutter. the invention. The cutter 28 has a center 30 of the cutter - a radius 32 of the cutter, and a point of tangency 34 with the central e 20 of the threaded member 12. The offset distance 36 between the center 30 of the cutter and the center 20 of the threaded member 12 is indicated and is approximately equal to (or slightly less than) the radius 32 of the reamer. This will be better described in what follows with respect to the preferred method of forming the cutting tip. Also, the size and placement of the cutter can be varied, provided that the result of the invention is obtained as a result.

The procedure currently suspended for the -formation of cutting tip 10 of the invention < -n a crimped member 12, comprises: (a) maintaining a member 12 (-oseado having a central ee, in a first stationary position by means of any suitable device (not shown); end of the threaded member, at the first inclined cut, moving a reamer milling cutting tool. {has a selected radius dimension with respect to the central axis 20 of the threaded member 12) so that the compensation distance between the center of the reamer 28 and the central shaft 20 is approximately equal to the radius 32 of the reaming cutter 29, thus forming a first concave curve 26 in the cutting tip 10; (c) rotating the threaded member 12 at a first angle or with respect to the first stationary position (described above), fixing the threaded member and then making a second cut. ncli swim as in stage (b), above; (d) rotating the threaded member 12 a second angle a with respect to the first stationary position and fixing the threaded member 12 and then performing a third inclined cut. In a preferred embodiment of the method of the invention, the angle or is 120 ° and three curved faces 26 are made on the cutting point 10. If the angle ex is 90 °, and a fourth inclined cut is made as described above, four curved faces 25 are obtained on the cut point; and if the angle or is 75 ° and five inclined cuts are made, five curved carbs on the cutting tip are obtained as a result. In FIG. 3, the cutting tip measured in l < Figures 1 and 2 have been rotated in the manner in which they would be inserted into the bone or into the skin, clockwise, at an angle of about 240 °. Now you can see the second side 38. The part 40 of the thread used to form the tip (not shown) continues to exist after the formation of the tip 10 je cut. The part 42 is the starting part of the first whole thread 27, complete and uninterrupted, the parts ü and 42 are not expensive. Other corresponding parts of the cutting tip 10 are shown and marked correspondingly in Figure 3. In Figure 4 the cutting tip 10 of Figure 3 is shown in front view, showing the three faces 26, 30 and 44 concave caves. The part 40 of the cut thread, which was cut by the cutter 28 and which was used to form the cutting tip 10, has also been shown. Only part 40 of the cut thread 40 remains. Additionally, the portions 42 and 46 of the adjacent thread (which is the first whole thread 27, also shown in Figure 2), are shown in Figure 4. The part 45 is a space of free space for Shearing The outer circumference 48 of the first full thread thread 27 has been shown and arched. You can also see Figure 4 the end 16 of the tip. The first face 26 has a substantially triangular shape, formed by three curved lines that include the curved line 50, the edge 52 and the edge 54. The second face 58 is not substantially triangular but on the contrary has the shape indicated , which is somewhat irregular and is limited by curve line 56, edge 54, edge 58 and line 60 curve. The third face 44 has a shape like the one shown, which is substantially triangular and is limited by the edge 58, the edge 52, the curved line 62 and the line 64. The point 66, the point 68 and the end 16 of the tip, are the tip ends of the first face 26. The point 66, the point 70 and the tip end 16 form the tip ends of the third face 44. The point 60, the point 72 and the end The tip ends of the second face 38 are formed at the tip. It will be appreciated that the ends 42 and 46 of the first full thread 27 are connected and continuous (ie, the first full thread thread 27 is not interrupted anywhere along its entire circumference). Also, point D is not a cut point. Points B (68), C (66) and 70 are cut points. In Figure 5, a cross-sectional view taken along line 5-5 of Figure 4 shows the end 16 of the tip. The first complete thread 27 is shown, as well as the thread 40 of the cut thread from which the beads 26, 38 and 44 are formed.). Figure 5 is a cross-sectional view of the movable suture anchor 14 in Figure 2, but rotates or with respect to the view of Figure 2. The ridge 52 and the line segment 53 represented by the dotted line in the Figure 4, together with ^ 1 point C (ie, 56) and point 57 in segment 56 of curved line, are shown in Figure 5. Figure 5 is a cross-sectional view, taken along line 6-6 in Figure 4, of member 12 shown in Figures 2 and 5, but rotated with respect to the view of Figure 5. The edge 58 and line segment 59 shown in Figure 4 are depicted. , together with the point ü (that is, 72) and the point or 73 of the line 50 curve. FIG. 7 shows a four-sided cutting tip, showing the tip end 16 and the first complete thread 27, together with the remaining part 40 remaining of the cut thread after the tip 10 has been cut therefrom. In Figure 8, a five-side cutting tip, with the tip end 16, the first full r-osca thread 27, and the remaining part 40 of the cut thread are shown. after the tip 10 has been cut therefrom. In Figure 9, the bolt 74 is shown without thread, with the cutting tip 10 of the invention and the tip end 16 modified so as to constitute one end 17 of blunt tip which has been formed by separating a very small amount from the tip end of the tip 16, for example (1.13 nm (0.005 inches), Figure 10 is an illustration of the entire US Pat. 4,978,350, in which there is shown an ApexR pin 74 embodiment having three grooves 76 and a plurality of interrupted threads 78. The Figure is provided for the purpose of illustrating an example of a groove (which is not present in the cutting tip of the present invention). Figures 11-15 are 5 photographs (with printed enlargements thereon) made by the use of an electron microscope of five views of a mode of a cutting tip according to the invention. These are photographs of a cutting tip that was not the same tip as the one that the artist used to make Figures 1-6. There are some very small differences between the two cutting tips, depending on how the tips were placed during the cutting of the tip; however, the main characteristics of the cutting tips are the same and demonstrate the reproducibility of the cutting tip of the invention and its manufacturing process. Figure 1 (photograph 1) corresponds substantially to Figures 1 and 2, but with the end of the tip pointing to the left instead of to the right.

I to Figure 12 (photograph 2) corresponds substantially to Figure 3, but seen with the tip end pointing to the left instead of to the right. Figure 13 (photograph 3) is substantially corresponding to Figure 4. Figure 1 (photograph 4) is a view of the cutting tip rotated 90 ° counterclockwise with respect to the view of the Figure 4. Figure 15 (photograph 5) is a view that was not shown in the drawings and clearly shows the beginning of the entire, uninterrupted, full thread located adjacent the cutting tip. The photograph 2 also shows this beginning of the first complete thread (as well as the part 40 of the cut thread used to form the tip portion 40 which is located at the top of the photograph). The differences in the depths of the tip and the threaded member are clearly visible in the photographs and especially in photograph 5. The cutting tip of the invention is characterized by the following characteristics. It has faces that are concave in shape, as opposed to having flat surfaces or convex surfaces. It has no grooves (similar to grooves and that would interrupt one or more threads). It can be placed on a threaded member or on a bolt without threads. It is self-positioning.

The cutting tip of the invention can be seen as if it were a modified trocar tip (which is different from the prior art cutters, since the corners of the invention have concave curved surfaces while the trocars of the prior art have flat surfaces). The new cutting tip design gives a result or a pointed end that does not slip on a surface and pierces the surface with relative ease. This form also eliminates fewer threads from the threaded member than in any other form of cutting tip known from the prior art, it is very simple and can be manufactured very easily. The tip of the cut of the invention is characterized by * having a built-in free ski space. The cutting tip of the invention is characterized by having a minimum loss of thread after the formation of the cutting tip and a maximum number of complete threads, and this is especially important in suture anchors with a good strength of subjection The tip penetrates the bone or skin without slipping or sliding on the bone or skin surface. The initial contact of the cutting tip with the bone or the surface of the skin consists of an advance movement, and the cutting tip is able to penetrate any surface where there is no hole previously on that surface (ie, the tip is self-piercing). When the cutting tip of the invention is present in a suture anchor, as much thread is kept as possible in the threaded member, after the cutting tip has been produced. This retains the thread clamping resistance. The Apex® per-no, unlike the cutting tip of the present invention, has grooves in relief. See FIG. 10. In the manufacture of the pre-cut cutting tip of the invention provided with the cheeks, the threaded member is placed in position, rotated several times and cuts are made. The cutting tip is completed in this way very simply. Likewise, for four faces, the threaded member is rotated four times and four cuts are made; and for five faces, five turns and five cuts are made. As seen in Figures 2 and 4, an edge 52, 54 remains in the threaded member 12 between any two inclined cuts, made for the preparation of the cutting tip, and these edges thread the thread at increasing distances from the line 20 central. The characteristic of the triangular pyramid formed when the faces 26, 38 and 44 are cut, is a characteristic of the three-sided cutting tip 10 of the invention. As shown in Figures 1 and 4, looking front to tip 10 cut, the end points where the faces meet are progressively further away from the center point. Thus, point C 66 is farther from the i-entral line than point B 68. And as a result of point 11 58 being closer to central line 20, point B 58 will contact and cut a small fiarte of thread as per one third of turn. Then, point C 66 will cut an additional part of bone. And as it continues, point D will cut something else. That is, as the cutting tip produces the cut through the surface plane, the contact with the plane (which is the cutting surface) moves, so that the line of the edge mtersecte the thread according to increasing meters , so that it provides several cutting edges until a circumference of the complete thread is completed. This provides a self-piercing feature that is achieved in a manner different from that achieved in the prior art *. Expressed differently, the short point 10 is defined in terms of a plane, intersecting first the end 16 of the point with that plane, then with the point B 68, then with the point C 65, and then with the point D 72. The edge that is a between the inclined cuts made to form the cutting tip 10, intersects with the thread that was (were) used to form the faces with increasing diameters (i.e., perpendicular distances of line 20). center). The faces of the cutting tip are concave. Therefore, the non-grooved design of the present invention has the ability to drag waste and avoid * clogging or clogging. The thread is short and then occupies the space that has been cut so that there is a minimum amount of waste. A smaller burr is created than with the devices of the prior art, and no burr removal operation is required in the manufacture of the cutting tip of the invention. Having described the invention as above, the content of the following claims is claimed as property.

Claims

NOVELTY OF THE INVENTION CLAIMS

1. - An apparatus having a self-penetrating and self-positioning cutting tip, located on a substantially cylindrically threaded member having an axis, said device comprising: a multi-face tip located adjacent to a plurality of r-osca yarns that includes an uninterrupted thread adjacent said tip and at a distance between two adjacent threads equal to a pitch p and a number of curved faces that is at least 3, said faces having been arranged around a single circumference of the intercepted thread, thereby resulting in a free chip space incorporated, for the chips generated during cutting, and as a result a whole, uninterrupted thread of thread adjacent to said tip (as opposed) grooves, which are rounded grooves and which result in a plurality of interrupted threads, including an interrupted r-osca wire adjacent to the tip cited).

2. An apparatus according to claim 1, wherein said cutting tip has three concave curved faces.

3 . - An apparatus according to Claim 2, wherein said shorting tip has four concave curved faces.

4. An apparatus according to claim 2, and also including said threaded member on which said cutting tip is located.

5. An apparatus according to claim 4, wherein said threaded member is a screw.

6. An apparatus according to claim 4, wherein said threaded member is a threaded bolt.

7 - An apparatus according to claim 4, wherein said threaded member is a suture anchor.

8. An apparatus according to claim 4, wherein said threaded member is a plug.

9. An apparatus comprising an a-to-penetrating and self-positioning cutting tip, located in a non-threaded member in a substantially cylindrical manner, having an e e.

10. A procedure for manufacturing a new cutting tip self-penetrating and self-positioning, which is located on a threaded member that has a central ee and threads and a diameter of the threaded member, which gives as a result? a self-piercing, self-piercing, self-penetrating and self-positioning device, said method comprising: (a) holding said threaded member in a first stationary position; (b) during a first inclined cut, move cutter-which has a center cutter and cutter diameter, with one end of a first diameter and one end 0 0 of a second diameter with respect to the aforementioned central member of said threaded member, so that the said end of a first diameter is usually tangent to said central axis of the said threaded member and as a result of Said central axis of the cutter is substantially perpendicular to said central axis of said threaded member, thus forming a first curved face in said cutting tip; (c) said threaded member rotates a first angle with respect to said first stitching position, fixing said threaded member in a second stationary position, and then making a second inclined cut as in step b (former * ), thus forming a second curved face in said cutting tip; (d) additionally rotate said threaded member a second angle cr with respect to said first stationary position and fix the said threaded member in a third stationary position and then make a third * inclined cut (as in stage b above *) , thus forming a third curved face in said cutting point; thereby forming a threaded member having a built-in splinter free space and a first full and uninterrupted thread located adjacent to said tip and which is more effective (i.e., it cuts the bone more easily) ), which is manufactured in much less time and with less burrs than in the manufacture of a threaded tipped member having at least one groove.

11. A method according to claim LO, wherein said < and of 120 ° and in which -e make three curved faces in the aforementioned cutting tip.

12. A method according to claim LO, wherein said angle or is 90 ° and in which four curved faces are made in said cutting tip.

13. A method according to claim 10, wherein o; is 75 ° and five faces are made in said cutting tip.

14. A method according to claim 11, and also including the additional step of (f) separating a length of said tip from said threaded member, so as to form a flat tip with a part substantially perpendicular to said central axis of said threaded member.

15. A method according to claim 14, wherein the step (d) cited is performed with said cutter.

16. A cutting tip formed by means of a manufacturing process of a new self-penetrating and self-positioning cutting tip, which is located in a r-osed member that has a central axis and threads and a diameter of the threaded member, said method comprising: (a) maintaining said threaded member in a first stationary position; (b) during a first inclined cut, moving a cutter having a cutter central ee and a diameter of the cutter, with one end of a first diameter and one end of a second diameter with respect to said central axis of said threaded member , so that said end of a first diameter is substantially tangent to said central axis of said threaded member and that said central axis of the cutter is substantially perpendicular to said central axis of said threaded member, thus forming a first curved face in said cutting tip; (c) rotate the member The threaded thread mentioned through a first angle α with respect to the first mentioned stationary position, fix the said threaded member in a second stationary position and then carry out a second inclined cut as in step b (above), thus forming a second curved surface in the L5 cited cutting tip; (d) additionally rotate said threaded member at a second angle a with respect to said first stationary position and fix said threaded member in a third stationary position and then perform a third inclined cut (as in step b) 20 above), thus forming a third curved surface in said cutting tip.

17. A cutting tip according to claim 16, wherein the angle or cited is 120 ° and in which three curved surfaces are made in said point 25 cutting.

18. An apparatus according to claim 4,) in which the threaded member is a drill bit. 1.9.- An apparatus according to claim 4, wherein said threaded member is a reamer. RESUSCITATION AND THE INVENTION A new cutting tip and a very simple procedure for manufacturing the tip are provided. The tip does not possess fiery grooves it has a free space for splinters incorporated; It is self-drilling, self-tapping and self-positioning and can be placed on a threaded or non-threaded member; When it constitutes the tip of a suture anchor, it optimizes the clamping force of the anchor. PF / elpin P97 / 47