TECHNOSCOPIC INSTRUMENT

Abstract

A technoscopic instrument (1) for machining surfaces in technical cavities, includes a stationary, tubular shank (7) and a tool unit (11), for holding a machining tool (13), arranged distally on the shank (7) and pivotable transversely to a longitudinal axis (37) thereof by way of a joint (9). The tool unit (11) is coupled to a first adjusting unit (17) which is arranged proximally on the instrument (1). The pivotable tool unit (11) includes an end section (43) which is arranged distally to the joint (9), is mounted in an axially displaceably and via an elongate control element (49) which is pull-rigid, push-stiff and pliable transverse to its longitudinal axial extension is coupled to a second adjusting unit (23) which is arranged proximally on the instrument (1) and which is provided independently and separately of the first adjusting unit (17), for selective telescoping of the end section (43).

Claims

1. A technoscopic instrument for machining surfaces in technical cavities, the technoscopic instrument comprising: a stationary, tubular shank; a pivotable tool unit for holding a machining tool, said tool unit being arranged distally on the shank and being pivotable transversely to a longitudinal axis of the shank by way of a joint, wherein the pivotable tool unit is coupled to a first adjusting unit which is arranged proximally on the technoscopic instrument, wherein the pivotable tool unit comprises an end section arranged distally to the joint, the end section being mounted axially displaceably; and an elongate control element which is pull-rigid, push-stiff and pliable transverse to a control element longitudinal axial extension, the elongate control element being coupled to a second adjusting unit which is arranged proximally on the technoscopic instrument and which is provided independently and separately of the first adjusting unit, for a selective telescoping of the end section.

2. A technoscopic instrument according to claim 1, wherein the elongate control element comprises at least one wire.

3. A technoscopic instrument according to claim 1, wherein the pivotable tool unit comprises a sleeve section and a cylinder section which is axially displaceable in the sleeve section.

4. A technoscopic instrument according to claim 3, wherein the sleeve section is coupled to the joint, and the cylinder section as an end section is connected to the elongate control element.

5. A technoscopic instrument according to claim 1, wherein: the elongate control element is spaced a distance relative to a longitudinal axis of the shank; and in pivotable tool unit the elongate control element assumes a coaxial alignment with pivotable tool unit.

6. A technoscopic instrument according to claim 5, wherein: pivotable tool unit comprises a run-in region for the elongate control element; said run-in region faces the joint and tapers in a distal direction.

7. A technoscopic instrument according to claim 1, wherein the shank in a region which is adjacent to the joint comprise at least one guide element which is spaced a distance to the pivotable tool unit and which limits a sagging of the elongate control element in at least one direction.

8. A technoscopic instrument according to claim 1, further comprising a push rod, wherein for pivoting, the pivotable tool unit is coupled eccentrically to the push rod and the push rod is led eccentrically in the shank and is pivotable by way of the first adjusting unit.

9. A technoscopic instrument according to claim 1, wherein the joint or the shank comprises at least one stop surface for limiting a pivoting angle of pivotable tool unit.

10. A technoscopic instrument according to claim 1, wherein pivotable tool unit is pivotable by up to 120°.

11. A technoscopic instrument according to claim 1, wherein the end section is rotationally fixedly displaceable.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the drawings:

[0024] FIG. 1 is a lateral view of a technoscopic instrument;

[0025] FIG. 2a is a lateral view showing a non-pivoted tool unit;

[0026] FIG. 2b is a lateral view showing a pivoted tool unit;

[0027] FIG. 3a is a lateral view with a telescoped end section;

[0028] FIG. 3b is a partly sectioned lateral view with a non-telescoped end section;

[0029] FIG. 3c is a partly sectioned lateral view with a telescoped end section; and

[0030] FIG. 4 is a detailed sectioned representation of a joint.

DESCRIPTION OF PREFERRED EMBODIMENTS

[0031] Referring to the drawings, FIG. 1 shows a lateral view of a technoscopic instrument 1 for machining surfaces in technical cavities. The instrument 1 comprises a hand grip 3 with a housing 5, on which a stationary, tubular shank 7 is arranged. A joint 9 which carries a tool unit 11 is arranged at a distal end of the shank 7. This represents a distal lengthening of the shank 7 and is configured to hold the machining tools 13. The joint 9 comprises at least one hinge axis 15 which runs transversely to the shank 7, for achieving a pivotability.

[0032] A first adjusting unit 17 is arranged on an end of the housing 5 which is opposite to the shank 7 and is configured by way of example as an adjusting wheel with a peripheral-side knurling. The first adjusting unit 17 by way of example is connected to a push rod 19 which runs eccentrically in the shank 7 in the direction of the joint 9. There it is coupled to the tool unit 11 at an eccentrically arranged pivoting point 21 which is close to the joint 9. The push rod 19 can be displaceably mounted and can be arranged merely running freely in the shank 7. The first adjusting unit 17 is formed by a mechanism which is not shown here and which is capable of moving the push rod 19 along the shank 7 in a manner such that the tool unit 11 is pivoted about the hinge axis 15.

[0033] A second adjusting unit 23 which is arranged distally adjacent to the first adjusting unit 17 is likewise configured exemplarily as an adjusting wheel with a peripheral knurling. In the shown variant, the first adjusting unit 17 and the second adjusting unit 23 are configured coaxially to one another and arranged axially one after the other. The second adjusting unit 23, as is explained hereinafter, is provided in order to achieve an axial displacement of the machining tool 13.

[0034] By way of example, a switch 25 for switching an operation of the machining tool 13 on or off is located on an outer side of the housing 5. This could be configured in a rotating manner. A speed of the machining tool 13, by way of example could be controlled via a speed controller 27 which is likewise arranged on the housing 5. A supply conduit 29 which for example serves for the electricity supply of a drive of the machining tool 13 connects to an end which is at the bottom in the plane of the drawing. It is conceivable for the machining tool 13 to be provided with an electric motor which in the representations is not shown in detail for the sake of simplicity and which could be placed either directly on the distal end of the tool unit 11 or within the housing 5. Finally, a rigid endoscope 31 is located at a proximal end of the instrument 1 and with the help of suitable optics permits an observation of the operating region by a user with the aid of suitable optics. The optics could herein run to into the tool unit.

[0035] In FIGS. 2a and 2b, the pivoting of the tool unit 11 is represented in two lateral views. FIG. 2a illustrates the tool unit 11 in a non-pivoted position, in which the stationary shank 7 and the tool unit 11 are arranged concentrically to one another. The push rod 19 is located in a maximally extended distal position and the pivoting point 21 is located in its distal end position. In FIG. 2b, the tool unit 11 is shown in an approximately maximally pivoted position.

[0036] The shank 7 in the proximity of the joint 9 comprises a first stop surface 33 which is arranged laterally on the shank 7 and which is configured to come into a surfaced contact with a proximal end surface 35 of the tool unit 11. By way of this, a possible pivoting range of the tool unit 11 is limited to an angular range a which is set by the first stop surface 33. This for example could encompass a range of up to 120° and lie between the surface normals on the first stop surface 33 and a longitudinal axis 37 of the shaft 7. The straight-lined concentric alignment of the tool unit 11 to the shank 7, which is shown in FIG. 2a, further corresponds with the second stop surface 39 which here is aligned perpendicularly to the longitudinal axis 37.

[0037] As is represented in the FIGS. 3a to 3c, the tool unit 11 can be axially telescoped, so that the machining tool 13 is axially displaced. In FIG. 3a, the tool unit 11 is situated in an extended position. For this, the tool unit 11 comprises a sleeve section 41 which is mounted on a joint 9 and, as an end section, a cylinder section 43 which is axially displaceable therein and which determines the distal extension of the tool unit 11. The cylinder section 43 has an outer diameter which is slightly smaller than the inner diameter of the sleeve section 41 which surrounds it. A simple but robust mechanical guidance results by way of this. In order to prevent a rotation of the cylinder section 43, the sleeve section 41 further comprises at least one axially running slot 45, in which a transverse pin 47 of the cylinder section 43 is led. It is conceivable for the sleeve section 41 to comprise such a slot 45 at two sides which are opposite one another, through which slot a single or several transverse pins 47 extend. The radius of action of the machining tool 13 is significantly enlarged due to the displacement of the cylinder section 43.

[0038] For moving the cylinder section 43, this is coupled to an elongate control element 49 which is led eccentrically in the stationary shank 7 and is movable in a longitudinal-axial manner by way of the first adjusting element 17. The control element 49 is pliable transverse to its longitudinal axis, but is pull-rigid and push-stiff (tensionally rigid and compressively stiff). It can be configured similarly to a Bowden cable at least in sections. The control element 49 on account of the pliable character is in the position of being led past the joint 9 over the complete pivoting range. If the tool unit 11 is pivoted, then the control unit 49 can very easily follow this movement. If it is moved in a longitudinal-axial manner, then the cylinder section 43 can follow this movement. One account of the tensionally and compressionally rigid characteristics, the cylinder section 43 can be retracted as well as extended.

[0039] FIG. 3c by way of example shows the extended position of the tool unit 11, at which the control element 49 is completely pushed out. On account of the pliable characteristics, the control element 49 however is not in the position of being able to transmit push forces over an unlimited stretch, without it being restricted in its movability in the transverse direction. For this, guide elements are applied in the shown representation and these are clear by way of FIG. 4 and limit a sagging of the control element 49.

[0040] FIG. 4 in a sectioned detailed view shows the course of the control element 49 in the region of the joint 9. The sleeve section 41 for guiding the control element 49 comprises a run-in region 51 which tapers in the distal direction. By way of this, the region of the run-in region 51 which faces the joint 9 is configured in a roughly funnel-like manner. By way of example, the run-in region 51 is arranged concentrically in the tool unit 11 and leads the control element 49 centrally onto the cylinder section, so that given its movement the damage of a jamming is minimized. By way of the run-in region 51, the control element 49 can also follow differently pivoted tool units 11 without it rubbing along a sharp-edged opening.

[0041] For leading the control element 49 for limiting a sagging, the shaft 7 by way of example can comprise a first guide element 53 which is positioned in a region which is adjacent to the joint 9, and is distanced to the tool unit 11. In a simple case, the first guide element 53 can be configured as a pin which runs transversely to the longitude axis 37 of the shank 7 and in at least one angular range of the tool unit 11 can come into a surfaced contact with the control element 49. A sagging which goes beyond this is then reliably prevented.

[0042] Furthermore, a second guide element 55 which transversely to the longitudinally axial extension of the control element 49 is distanced to the first guide element 53 and which is offset proximally somewhat is provided. By way of example, the second guide element 55 comprises a convex surface which can likewise come into a surface contact with the control element 49. The control element 49 is then always located between the two guide elements 53 and 55 and is then distanced at least from one of the two guide elements 53 and 55. If the tool unit 11 is brought into a coaxial position with the shank 7, the control element 49 snuggles onto the second guide element 55 so that its sagging is limited and the control element 49 can continue to transmit pulling and pushing forces. Given a high pivoting angle, the control element 49 again comes into surface contact with the first guide element 53.

[0043] The pivoting point 21 which is coupled to the push rod 19 is also shown in more detail in FIG. 4. The push rod 19 could be coupled to the pivoting point 21 via a joint fork or merely comprise a bent or angled end which is stuck into the tool unit 11. The articulated connection leads to a tilting movement of the tool unit 11 about the joint 9 or the hinge axis 15 which is defined by this.

[0044] While specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.

LIST OF REFERENCE NUMERALS

[0045] 1 technoscopic instrument [0046] 3 hand grip [0047] 5 housing [0048] 7 stationary shank [0049] 9 joint [0050] 11 tool unit [0051] 13 machining tool [0052] 15 hinge axis [0053] 17 first adjusting unit [0054] 19 push rod [0055] 21 pivoting point [0056] 23 second adjusting unit [0057] 25 switch [0058] 27 speed controller [0059] 29 supply conduit [0060] 31 endoscope [0061] 33 first stop surface [0062] 35 proximal end surface [0063] 37 longitudinal axis [0064] 39 second stop surface [0065] 41 sleeve section [0066] 43 cylinder section, end section [0067] 45 slot [0068] 47 transverse pin [0069] 49 control element [0070] 51 run-in region [0071] 53 first guide element [0072] 55 second guide element