Surgical saw apparatus

Abstract

A surgical saw apparatus, includes: A) a housing; B) a drive unit with a drive axle having a central axis; C) a deflection device, including: a connecting rod that is arranged movably in the housing, with a longitudinal axis, with a rear section and with a front section with members for a fixation of a sawblade; an eccentric shaft with at least one first section, which is arranged coaxially with the central axis of the drive axle and is connected with the drive axle, and with a second section which is eccentric relative to the first section, wherein the rear section of the connecting rod is a bearing for the eccentric second section of the eccentric shaft, and the front section of the connecting rod is a fixation device for a sawblade; and a guiding device for the connecting rod, wherein D) the guiding device includes first members for a limitation of a movement of the connecting rod, which are movable relative to the housing and which force a translational movement of the connecting rod coaxially with the longitudinal axis of the connecting rod, and E) the guiding device includes second members for a limitation of a movement of the first members, which are movable relative to the housing and which force a movement of the first members transversally to the longitudinal axis of the connecting rod.

Claims

1. A surgical saw apparatus, comprising: A) a housing; B) a drive unit with a drive axle comprising a central axis, wherein a rotation movement of the drive axle around the central axis can be generated by means of the drive unit; C) a deflection device, comprising: C1) a connecting rod that is arranged movably in the housing, with a longitudinal axis, with a rear section and with a front section; C2) an eccentric shaft with at least one first section, which is arranged coaxially with the central axis of the drive axle and is connected with the drive axle, and with a second section which is eccentric relative to the first section, wherein the rear section of the connecting rod comprises a bearing for the eccentric second section of the eccentric shaft, and the front section of the connecting rod comprises a fixation device for a sawblade; C3) a guiding device for the connecting rod, wherein D) the guiding device comprises first members for a limitation of a movement of the connecting rod, which are movable relative to the housing and which force a translational movement of the connecting rod coaxially with the longitudinal axis of the connecting rod, and E) the guiding device comprises second members for a limitation of a movement of the first members, which are movable relative to the housing and which force a movement of the first members transversally to the longitudinal axis of the connecting rod, wherein the first members of the guiding device form a linear guidance for the parallel side surfaces of the connecting rod.

2. The surgical saw apparatus according to claim 1, wherein the connecting rod comprises two side surfaces extending parallel to a plane, said plane being spanned by the longitudinal axis of the connecting rod and by a bearing axis of the bearing for the eccentric section of the eccentric shaft in the rear section of the connecting rod.

3. The surgical saw apparatus according to claim 1, wherein the linear guidance comprises one guiding element or a plurality of guiding elements on each of the two side surfaces of the connecting rod.

4. The surgical saw apparatus according to claim 1, wherein the first members comprise a structural component, which is movable transversally to the housing, wherein the guiding elements of the linear guidance are arranged on or in said structural component.

5. The surgical saw apparatus according to claim 1, wherein the second members form a transversal guidance for the structural component relative to the longitudinal axis of the connecting rod.

6. The surgical saw apparatus according to claim 1, wherein the eccentric second section has, relative to the first section of the eccentric shaft, an eccentricity e in a range between 0.25 mm and 0.5 mm.

7. The surgical saw apparatus according to claim 1, wherein the drive axle of the drive unit has a rotation speed of at least 9,000 rpm, preferably at least 10,000 rpm.

8. The surgical saw apparatus according to claim 1, wherein the drive axle of the drive unit has a rotation speed of maximally 22,000.

9. The surgical saw apparatus according to claim 1, wherein the linear guidance and/or the transversal guidance comprise/comprises two or more roller bearings.

10. The surgical saw apparatus according to claim 1, wherein the surgical saw apparatus further comprises a sawblade.

11. The surgical saw apparatus according to claim 1, wherein the drive axle of the drive unit has a rotation speed of maximally 20,000 rpm.

Description

(1) In the following the invention and further developments of the invention will be explained in detail making use of the partly schematic illustrations of several exemplary embodiments.

(2) It is shown in:

(3) FIG. 1 a view of a deflection device of a first embodiment of the surgical saw apparatus according to the invention;

(4) FIG. 2 a longitudinal section along line I-1 of the embodiment of the surgical saw apparatus according to the invention that is shown in FIG. 1;

(5) FIG. 3 a perspective view of a longitudinal section of the deflection device of a second embodiment of the surgical saw apparatus according to the invention;

(6) FIG. 4 a view of the deflection device of the embodiment of the surgical saw apparatus according to the invention that is shown in FIG. 3;

(7) FIG. 5 a longitudinal section along line II-II of the embodiment of the surgical saw apparatus according to the invention that is shown in FIG. 3;

(8) FIG. 6 a view of the deflection device of a third embodiment of the surgical saw apparatus according to the invention;

(9) FIG. 7 a partial view of the deflection device of the embodiment of the surgical saw apparatus according to the invention that is shown in FIG. 6;

(10) FIG. 8 a sectional view of the embodiment of the surgical saw apparatus according to the invention that is shown in FIGS. 3 to 5;

(11) FIG. 9 a perspective view of the embodiment of the surgical saw apparatus according to the invention that is shown in FIGS. 3 to 5;

(12) FIG. 10 a sectional view of a further embodiment of the surgical saw apparatus according to the invention, with the deflection device shown in FIGS. 3 to 5; and

(13) FIG. 11 a perspective view of the embodiment of the surgical saw apparatus according to the invention that is shown in FIG. 10.

(14) In FIGS. 1 and 2 a first embodiment of the deflection device 6 of the surgical saw apparatus according to the invention 1 is illustrated. Furthermore, to give a better overview, portions of the housing 2 and of the drive unit 3 are shown schematically. The drive unit 3 is integrated in the housing 2 (FIGS. 8 and 9) or fixated on the housing 2 (FIGS. 10 and 11) and comprises a drive axle 5 with a central axis 4, wherein a rotation movement of the drive axle 5 around the central axis 4 can be generated by means of the drive unit 3.

(15) The deflection device 6 shown in FIGS. 1 and 2 substantially comprises a connecting rod 7 which is arranged movably in the housing 2, an eccentric shaft 11 which is connected with the drive axle 5 and the connecting rod 7, and a guiding device 17 for the connecting rod 7. The eccentric shaft 11 comprises a first section 12, which is arranged coaxially with the central axis 4 of the drive axle 5 and is connected with the drive axle 5, and a second section 13, which is arranged eccentrically relative to the first section 12. Herein axes of the first and second sections 12, 13 are arranged in parallel. Herein the eccentric second section 13 has relative to the first section 12 of the eccentric shaft 11 an eccentricity e that is in a range between 0.25 mm and 0.5 mm, depending on an application of the saw apparatus.

(16) The eccentric shaft 11 is supported in the housing 2 concentrically to the first section 12, which is arranged coaxially with the central axis 4 of the drive axle 5, and may comprise a further section that is coaxial with the first section 12, such that it is possible for the eccentric shaft 11 to be supported in a two-part housing 2 at respectively one section that is coaxial with the central axis 4 of the drive axle 5.

(17) The connecting rod 7, which is arranged movably in the housing 2, comprises a longitudinal axis 8, a rear section 9 and a front section 10 with members for a fixation of a sawblade 16. In the rear section 9 of the connecting rod 7 a bearing 14 for the eccentric second section 13 of the eccentric shaft 11 is arranged, which is, to give an example but not limited to this example, implemented as a roller bearing. Alternatively the bearing 14 could also be implemented as a slide bearing. The front section 10 of the connecting rod 7 comprises a fixation device 15 for the sawblade 16.

(18) The guiding device 17 for the connecting rod 7 serves for a transformation of the circular movement, which is exerted onto the bearing 14 in the rear section 9 by the eccentric second section 13 of the eccentric shaft 11, into a combined translational movement of the connecting rod 7 in two mutually orthogonal axial directions.

(19) The guiding device 17 comprises first members 18, which are movable relative to the housing 2, for a limitation of the movement of the connecting rod 7, and second members 19, which are movable relative to the housing 2 and which limit the movement of the first members 18. By means of the first members 18, a translational movement of the connecting rod 7 coaxially with the longitudinal axis 8 of the connecting rod 7 is forced, while a movement of the first members 18 transversally to the longitudinal axis 8 of the connecting rod 7 is forced by the second members 19. The connecting rod 7 therefore moves coaxially with its longitudinal axis 8 and at the same time in a transversal direction orthogonally to the longitudinal axis 8, wherein the longitudinal axis 8 of the connecting rod 7 is translated in parallel. As a result, the circular movement of the bearing 14 in the rear section 9 of the connecting rod 7 is transferred to the front section 10 and thus to the sawblade 16.

(20) The connecting rod 7 comprises two side surfaces 20a, 20b extending parallel to a plane 21, said plane 21 being spanned by the longitudinal axis 8 of the connecting rod 7 and by the bearing axis 22 of the bearing 14 for the eccentric section 13 of the eccentric shaft 11 in the rear section 9 of the connecting rod 7. The first members 18 of the guiding device 17 are implemented as a linear guidance for the parallel side surfaces 20a, 20b of the connecting rod 7 and respectively comprise one or a plurality of guiding element/s 23 which are adjacent to each of the two side surfaces 20a, 20b of the connecting rod 7.

(21) The first members 18 comprise a structural component 24, which is movable transversally to the housing 2, wherein the guiding elements 23 of the linear guidance are arranged on said structural component 24. The guiding elements 23 of the first members 18 are, to give an example but not limited to this example, embodied as roller bearings which are fixated on the structural component 24 that is movable transversally to the longitudinal axis 8 of the connecting rod 7. The linear guidance is thus realized by the roller bearings which are fixated on the structural component 24.

(22) The second members 19 form a transversal guidance for the structural component 24 relative to the longitudinal axis 8 of the connecting rod 7. Furthermore the transversal guidance comprises, by way of example and not limited thereto, roller bearings 26, which are fixated in the housing 2 so as to enable a movement of the structural component 24 orthogonally to the longitudinal axis 8 of the connecting rod 7.

(23) The embodiment of the surgical saw apparatus 1 that is illustrated in FIGS. 3 to 5 differs from the embodiment illustrated in FIGS. 1 and 2 only in that the connecting rod 7 is guided in a groove 25 in the structural component 24, that the structural component 24, which is movable transversally to the longitudinal axis 8 of the connecting rod 7, is guided slidably in a further groove 30 that is arranged in the housing 2 orthogonally to the longitudinal axis 8 of the connecting rod 7, and that the connecting rod 7 is supported on a passive second eccentric shaft 11′ in a section that is situated between the front section 9 and the rear section 10. This passive eccentric shaft 11′ is not driven by the drive unit 3.

(24) An overall illustration of the embodiment of the surgical saw apparatus 1 according to FIGS. 3 to 5 is given in FIGS. 8 and 9. The housing 2 is embodied in a two-part implementation, with the housing portion containing the drive unit 3 being realized as a handle and extending in the direction of the central axis 4 of the drive axle 5. The drive unit 3 may, to give an example but not limited to this example, comprise an electromotor and operating elements.

(25) The sawblade 16 is implemented longitudinally and may have a length between 15 mm and 100 mm, depending on the application of the saw apparatus 1. Furthermore the sawblade 16 may have parallel sides in its longitudinal direction or may taper towards the free end of the sawblade 16. The sawteeth are arranged on both longitudinal sides and at the free end of the sawblade 16, wherein on the toothed circumferential section of the sawblade 16, analogously to a chainsaw, the cutting sides of the sawteeth point in the same direction.

(26) A further overall illustration of a further embodiment of the surgical saw apparatus 1 is given in FIGS. 10 and 11. The embodiment illustrated in FIGS. 10 and 11 differs from the embodiment given in FIGS. 8 and 9 only in that the drive unit 3 is arranged in such a way that the central axis 4 of the drive axle 5 is situated in the plane spanned by the longitudinal axis 8 of the connecting rod 7 which is moved in a longitudinal and in a transversal direction, and extends, depending on a situation of the connecting rod 7, coaxially with or parallel to the longitudinal axis 8 of the connecting rod 7 and that, between the drive axle 5 and the eccentric shaft 11, a gear transmission 26 is arranged, by means of which the rotation movement of the drive axle 5 is deflected into the rotation movement of the eccentric shaft 11 that is angled by 90°.

(27) The construction forms (in-line and pistol handle) presented in FIGS. 8 to 11 are configured for different applications, for the purpose of allowing the operator an ideal handling, body posture, patient positioning, field of vision, force input, etc.

(28) The embodiment of the surgical saw apparatus 1 illustrated in FIGS. 6 and 7 differs from the embodiment illustrated in FIGS. 1 and 2 only in that the structural component 24 of the first members 18 of the guiding device 17 is supported on the housing 2 such that it is pivotable by two levers 27a, 27b, which are rotatably connected with the housing 2. The structural component 24, the two levers 27a, 27b which are rotatably supported on the structural component 24 via first articulations 28a, 28b, and the housing section between the two second articulations 29a, 29b for the levers 27a, 27b, which are arranged on the housing 2, form a parallelogram whose sides are rotatable against each other around the first, respectively second articulations 28a, 28b, 29a, 29b. The first and second articulations 28a, 28b, 29a, 29b, to give an example but not limited to this example, comprise roller bearings. Alternatively slide bearings could as well be present instead of roller bearings.

(29) Although, as has been described above, there are different embodiments of the present invention, these are to be understood such that the different features may be used both individually and in any arbitrary combination.

(30) The present invention is therefore not just limited to the particularly preferred embodiments which are given above.