Trephine

Abstract

A trephine is provided. The trephine includes a hole saw sized to accommodate an implant, the hole saw having a cylindrical body having a proximal end, a distal end, and an outer surface, a plurality of circumferentially spaced cutting teeth at the distal end of the cylindrical body, and a plurality of helical grooves located on the outer surface of the cylindrical body; and a quick connector coupled to the proximal end of the cylindrical body for releasable connection to a mating quick connector of a tool.

Description

Background of the Invention

[0002] Exemplary embodiments of the present invention relate generally to trephine saws, and more particularly, to trephine saws for resecting an interface around a cylindrical implant implanted in a patient. Summary of the invention

[0003] According to an exemplary embodiment of the present disclosure, a trephine is provided. The trephine comprises a hole saw sized to receive an implant, the hole saw having: a cylindrical body having a proximal end, a distal end, and an outer surface, a plurality of circumferentially spaced cutting teeth located at the distal end of the cylindrical body, and a plurality of spiral grooves located at the outer surface of the cylindrical body; and a quick connector coupled to the proximal end of the cylindrical body for releasably connecting to a mating quick connector of a tool.

[0004] According to an aspect of the present disclosure, each of the plurality of cutting teeth extends radially outward beyond an outer surface of the cylindrical body.

[0005] According to another aspect of the present disclosure, the helical groove has a depth, and each of the cutting teeth extends radially outward beyond the outer surface of the cylindrical body a distance approximately equal to the depth of the helical groove.

[0006] According to yet another aspect of the present disclosure, each of the plurality of cutting teeth has a curved blade.

[0007] According to yet another aspect of the present disclosure, the cylindrical body has an inner diameter of about 6 mm to 26 mm.

[0008] According to yet another aspect of the present disclosure, the plurality of spiral grooves includes eight spiral grooves.

[0009] According to yet another aspect of the present disclosure, the cylindrical body has a length of about 17.8 cm to 22.9 cm.

[0010] According to yet another aspect of the present disclosure, the quick connect includes at least one flat surface for receiving a torsional force from a tool connected to the quick connect.

[0011] According to yet another aspect of the present disclosure, the quick connector includes at least one proximally facing elevation for receiving an axial force from a tool.

[0012] According to yet another aspect of the present disclosure, each of the circumferentially spaced cutting teeth has a cutting edge having a width that is less than a width of an adjacent helical groove.

[0013] According to another aspect of the present disclosure, the plurality of spiral grooves include eight spiral grooves, each having a depth; each of the cutting teeth: extends radially outward, exceeds the outer surface of the cylindrical body by a distance approximately equal to the depth of the spiral groove, and has a curved blade, and the width of the cutting edge is less than the width of an adjacent spiral groove; the cylindrical body has an inner diameter of approximately 6 mm to 26 mm, and a longitudinal length of approximately 17 cm to 30 cm; and the quick connector includes: at least one flat surface for receiving a torsional force from a tool connected to the quick connector, and at least one proximally facing high land for receiving an axial force from the tool.

[0014] Other features and advantages of the present disclosure will be apparent from the following more detailed description of exemplary embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] When read in conjunction with the accompanying drawings, the preceding summary of the exemplary embodiments of the present disclosure, as well as the following detailed description, will be better understood. For the purpose of illustrating the present disclosure, exemplary embodiments are shown in the drawings. However, it should be understood that the present application is not limited to the precise arrangements and means shown.

[0016] Figure 1 is a perspective view of a trephine according to an exemplary embodiment of the present disclosure;

[0017] Figure 2 yes Figure 1 A partial stereoscopic view of the proximal end of a trephine;

[0018] Figure 3 yes Figure 1 Another perspective view of the distal end of the trephine;

[0019] Figure 4 yes Figure 1 Another partial perspective view of the distal end of the trephine;

[0020] Figure 5 yes Figure 1 a distal-facing view of the trephine;

[0021] Figure 6 yes Figure 1 Another partial stereoscopic view of the trephine;

[0022] Figure 7 yes Figure 1 An enlarged partial stereoscopic view of a trephine;

[0023] Figure 8 yes Figure 1 An enlarged partial perspective view of a cutting tooth of a hole saw of a ring saw;

[0024] Fig. 9 yes Figure 1A partial side view of a quick-connector of a trephine;

[0025] Fig.10 is connected to the tool Figure 1 A partial cross-sectional view of a trephine; and

[0026] Fig.11 is a perspective view of a distal end of a trephine according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] Reference will now be made in detail to various exemplary embodiments of the present disclosure shown in the accompanying drawings. Where possible, the same or similar reference numbers will always be used in the drawings to refer to the same or similar features. It should be noted that the drawings are simplified forms and are not drawn to exact proportions. The following description uses certain terms only for convenience and is not restrictive. Directional terms, such as top, bottom, left, right, above, below, and diagonal, are used relative to the drawings. The term "far" will mean away from the center of the subject. The term "near" will mean closer to the center of the subject and / or away from the "far" end. The words "inward" and "outward" refer to the direction toward and away from the geometric center of the element referred to and its designated part, respectively. Such directional terms used in conjunction with the following description of the drawings should not be interpreted as limiting the scope of the present application in any way that is not explicitly stated. In addition, the term "one" as used in the specification means "at least one". The term includes the words explicitly mentioned above, its derivatives, and words of similar meaning.

[0028] As used herein, "about" when referring to a measurable value such as an amount, duration, etc., is intended to include variations of ±20%, ±10%, ±5%, ±1%, or ±0.1% from the specified value, provided such variations are appropriate.

[0029] As used herein, "substantially" shall mean a fairly large range, mostly but not entirely what is specified, or appropriate variations therefrom, as long as it is acceptable in the technical field.

[0030] As used herein, "exemplary" shall mean serving as an example.

[0031] Throughout this application, various aspects thereof can be presented in range format. It should be understood that the description of range format is only for convenience and brevity, and should not be interpreted as a rigid limitation on the scope of the present disclosure. Therefore, the description of the scope should be considered to have all possible sub-ranges disclosed explicitly, as well as individual numerical values ​​within the scope. For example, the description of a range such as from 1 to 6 should be considered to have clearly disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and individual numbers within the scope, such as 1, 2, 2.7, 3, 4, 5, 5.3 and 6. Regardless of the width of the scope, this applies.

[0032] In addition, the features, advantages, and characteristics of the exemplary embodiments of the present disclosure described may be combined in any suitable manner in one or more embodiments. In view of the description herein, those skilled in the art will recognize that the present disclosure may be practiced without one or more of the specific features or advantages of a particular exemplary embodiment. In other examples, additional features and advantages may be identified in certain embodiments that may not be present in all exemplary embodiments of the present disclosure.

[0033] Referring now to the various figures, a trepan saw 100 is shown according to an exemplary embodiment of the present disclosure. The trepan saw 100 includes a hole saw 102, and a quick connector 120 located at the proximal end of the hole saw 102 for releasably connecting the trepan saw 100 to a mating quick connector of a tool, such as a tool extension 200 (see FIG. Fig.10 ), such as a drill bit, handle, slide hammer, impact plate or other element.

[0034] The hole saw 102 includes an elongated shaft-like body 128 having a central longitudinal axis 152, a proximal end 106 coupled to a quick connector 120, and a distal end 104 having a plurality of cutting teeth 108, an outer surface 112, and a plurality of spiral grooves 110 extending along the outer surface 112. According to one aspect of the present disclosure, the hole saw 102 has an overall length L1 of about 20.3 cm, but alternatively less than or greater than about 17.8 cm to 22.9 cm, such as 10.2, 12.7, 15.2, 22.3, 25.4, 27.9, 30.5, or more cm. According to another aspect of the present disclosure, the hole saw 102 has an inner diameter D2 of about 6 mm to 26 mm, including 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 and 25 mm, but alternatively may be less than about 6 mm or greater than about 26 mm, such as 3, 4, 5, 27, 28, 29 mm. According to another aspect of the present disclosure, the inner diameter D2 is selected to accommodate a particular type or type of implant, including, for example, rods, pins, nails, and other implants having a substantially cylindrical shape.

[0035] The body 128 is preferably formed of a rigid and sterilizable material, such as a metal or a sterilizable composite, but it should be understood that the body 128 can be formed of any other suitable material. In the embodiment depicted in the figures, the body 128 forms a cylindrical member having a circular cross-section, but it should be understood that the body 128 can have different shapes, lengths and / or cross-sections. It should also be understood that the body 128 can be formed as a whole as one piece (as shown in the figures) or formed by a plurality of separate and connectable body segments.

[0036] In the embodiment depicted in the figures, the body 128 is provided with eight spiral grooves 110, each spiral groove is located between two cutting teeth 108, and extends the entire length (or substantially the entire length) of the body 128, but it should be understood that the spiral groove 110 can extend over only a portion of the body 128. It should also be understood that the body 128 can be provided with more or fewer spiral grooves 110, such as 4, 5, 6, 7, 9, 10, 11, 12 or more grooves, and / or different or similar numbers of spiral grooves 110 and cutting teeth 108.

[0037] Each of the cutting teeth 108 is configured to be Figure 3 ) and cuts through the bone, cement and / or soft tissue surrounding the implant. Figures 3 to 8 As best shown in FIG. 1 , the cutting teeth 108 are spaced apart a distance X1 around the distal end 104 of the body 128 and extend distally therefrom. The cutting teeth 108 are also radially bent outwardly beyond the outer surface 112 of the body 128 by a distance Y1 (see FIG. 1 ). Figure 4 ). In the embodiment depicted in the figure, the distance Y1 is approximately equal to the depth D1 of the spiral groove 110, but it should be understood that the distance Y1 and the depth D1 can be different. For example, the distance Y1 and the distance that the cutting tooth 108 extends beyond the outer surface 112 can be, for example, 1.5x, 2.0x, or 2.5x the depth D1.

[0038] Each of the cutting teeth 108 includes: a blade 140; a curved cutting face 144 having a rake angle of about 0 to 30 degrees; a notched or curved edge 135 to reduce debris; and a cutting length t1 of about 0.089 to 0.102 cm. Figures 1 to 10 In the embodiment depicted in FIG. 1 , each blade 140 is curved, but it should be understood that the trephine 100 may alternatively be provided with a variety of other blades having different sizes, shapes, curvatures, lengths, and / or dimensions, for example to accommodate various types of implants. For example, in one embodiment, each blade 140 is straight (not curved) and has a rake angle of approximately 0 degrees (see FIG. 1 ). Fig.11). Each blade 140 may also have a different thickness / width and / or curve in the distal and / or outward radial direction relative to the longitudinal axis 152 of the body 128. In one embodiment, each of the cutting teeth 108 has a cutting edge having a width that is less than the width of the adjacent helical groove 110, but it should be understood that the size of these features may vary.

[0039] As described above, the structure of the quick connector 120 is designed to be releasably connected to a tool, such as a drill bit, a handle, a slide hammer, a strike plate, or other element (not shown). In the embodiment depicted in the figure, the quick connector 120 includes a Hudson connector, but it should be understood that the quick connector 120 may include other types of connectors.

[0040] like Figure 1 , 2 , 9 and 10, the quick connector 120 includes a distal end 182 and a proximal end 180, the proximal end having a neck and hexagonal portions 166, 168, the neck and hexagonal portions being configured to properly position the trephine 100 within a tool, such as a tool extension 200 (see Fig.10 ). The distal end 182 of the quick connector 120 is provided with a circular mounting head 190 having a distally extending intermediate flange portion 192 and a proximally facing elevation 194, a first post 186 extending proximally from the mounting head 190, a second post 188 proximal to and coaxial with the first post 186, and an annular groove 178 between the first post 186 and the second post 188 for engagement with a locking element 205 of a tool, such as a tool extension 200. The first post 186 and the second post 188 are provided with corresponding pairs of opposing flats or flat surfaces 191, 191' and 187, 187' that are configured to engage with appropriately positioned mating surfaces 210, 210' and 215, 215' of a mating tool, such as a tool extension 200, to permit the tool extension 200 to apply a torsional force to the trepan 100 when rotated. Proximally facing elevations 194 of mounting head 190 cooperate with appropriately positioned surfaces 220 of a mating tool extension, such as tool extension 200, to allow trepan 100 to receive forces applied axially to tool extension 200, such as when tool extension 200 is a sliding hammer or strike plate.

[0041] The trephine 100 can be used to excise an interface around an implant, such as a cylindrical implant (not shown), implanted in a patient. To begin operation, a tool (such as a T-handle or a drill bit) suitable for applying a torsional force to the trephine 100 is connected to the quick connector 120. The distal end 104 of the body 128 is then positioned around the implant. A torsional force is then applied, such as by a drill bit, to rotate the cutting teeth 108 and their corresponding curved blades 140 to drive the hole saw 102 of the trephine 100 into the interface around the implant. As the hole saw 102 is driven into the interface, the fragments of bone, cement and / or soft tissue removed by the cutting teeth 108 are introduced into the spiral groove 110 and transported away from the patient at the proximal end by the spiral groove. Once the interface around the implant is completely cut, the trephine 100 can be removed from the patient.

[0042] If the trephine 100 becomes stuck in the interface during a cutting operation, the drill bit can be backed up slightly and driven forward again to continue the operation. If backing up the drill bit is not possible or effective, the drill bit can be removed and a T-handle, hammer, or other suitable tool extension can be coupled to the quick connect 120 to permit the surgeon or other user to manually apply a continuous or impact torsional or linear force to the trephine 100 to back the hole saw 102 out of the interface, after which the drill bit can be reconnected to continue the cutting operation. Other tool extensions can be coupled to the trephine 100 to assist in the loosening process. For example, a sliding hammer or strike plate extension can be coupled to the trephine 100 to permit the surgeon or other user to apply an axially directed impact force to assist in loosening the hole saw 102.

[0043] Those skilled in the art will appreciate that changes may be made to the exemplary embodiments described above without departing from the broad inventive concepts of the present disclosure. Therefore, it will be understood that the present disclosure is not limited to the particular embodiments disclosed, but is intended to cover modifications within the spirit and scope of the present disclosure as disclosed above and defined by the appended claims.

Claims

1. A trephine (110), comprising a hole saw (102), the hole saw being sized to accommodate an implant, the hole saw comprising: A cylindrical body (128) having a proximal end (106), a distal end (104) and an outer surface (112); and a plurality of circumferentially spaced cutting teeth (108) at the distal end of the cylindrical body (128), the trephine being characterized by: a plurality of helical grooves (110) disposed on the outer surface (112) of the cylindrical body (128); and A quick connect (120) is coupled to the proximal end (106) of the cylindrical body (128) for releasable connection to a mating quick connect of a tool.

2. The ring saw of claim 1, wherein each of the plurality of cutting teeth (108) extends radially outward beyond the outer surface (112) of the cylindrical body (128).

3. A ring saw as described in claim 1 or claim 2, wherein each of the plurality of spiral grooves (110) has a depth, and each of the cutting teeth extends radially outward beyond the outer surface (112) of the cylindrical body (128) a distance approximately equal to the depth of the spiral groove (110).

4. The ring saw of claim 1, wherein each of the plurality of cutting teeth (108) has a curved blade.

5. The trephine of claim 1, wherein the cylindrical body (128) has an inner diameter of about 6 mm to 26 mm.

6. The trephine of claim 3, wherein the cylindrical body (128) has an inner diameter of about 6 mm to 26 mm.

7. The trephine of claim 1, wherein the plurality of spiral grooves (110) comprises eight spiral grooves.

8. The trephine of claim 3, wherein the plurality of spiral grooves (110) comprises eight spiral grooves.

9. The trephine of claim 1, wherein the cylindrical body (128) has a length of approximately 17.8 cm to 22.9 cm.

10. The trephine of claim 1, wherein the cylindrical body (128) has a longitudinal length of about 17 cm to 30 cm.

11. The ring saw of claim 1, wherein the quick connect (120) includes at least one flat surface (191) for receiving a torsional force from a tool connected to the quick connect (120).

12. The trephine of claim 1, wherein the quick connect (120) includes at least one proximally facing plateau (194) for receiving an axial force from the tool.

13. The trephine of claim 1, wherein each of the circumferentially spaced cutting teeth (108) has a cutting edge having a width that is less than a width of an adjacent helical groove (110).

14. The ring saw of claim 1, wherein the plurality of spiral grooves (110) comprises eight spiral grooves, each spiral groove having a depth; wherein each of the cutting teeth: extending radially outwardly beyond the outer surface (112) of the cylindrical body (128) a distance approximately equal to the depth of the helical groove (110) and having curved blades, and The cutting edge has a width that is less than a width of an adjacent helical groove (110); wherein the cylindrical body (128) has an inner diameter of about 6 mm to 26 mm, and a longitudinal length of about 17 cm to 30 cm; and The quick connector (120) comprises: at least one flat surface (191) for receiving a torsional force from a tool connected to the quick connect (120), and At least one proximally facing plateau (194) is provided for receiving an axial force from the tool.

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