DE8030149U1 - Cartilage or bone cutter - Google Patents

Description

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Applicant: Richard Wolf GmbH, Pforzheimer Str. 24, 7134 Knittlingen

Cartilage or bone cutter

The innovation relates to a cartilage or bone bur |

$ according to the generic term of the protection claim 1. %

Cartilage or bone cutters consist of a drivable, hollow cutting shaft rotatably mounted in a tubular shaft, which is formed at the distal end by wall cutouts as a cutting head or milling head with which the edge of a recess of the tubular shaft cooperates. The hollow shaft is a fixed part of a proximal shaft extension mounted coupling for coupling a drive and is distal to the proximal drive coupling with a wall opening provided, which can be connected to a negative pressure via a connection of the tubular shaft.

It is understandable that the cutting of the distal cutting or milling head is achieved by machining cartilage or bone become blunt and therefore the hollow shaft with the drive coupling and a suspension must be replaced as a whole.

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In order to avoid this complete replacement of the hollow shaft with drive coupling and suspension, the solution is after the innovation from the characterizing features of claim 1.

The thin-walled hollow shaft is divided along its length into a distal length part, which has the milling head, and the proximal length part, which always remains rigidly connected to the drive coupling, and these two length parts are divided by a force-locking or form-fitting coupling in the area of the mutually facing ends of the two shaft length parts connected, in the case of a force-locking connection, the force-locking is maintained by the fact that the hollow or cutting shaft through the distal end

an axial suspension is held against the bottom of the tubular shaft will. So when the milling head cutting becomes blunt, it needs only the distal length part of the hollow shaft has to be exchanged for a new length part, the coupling being replaced by the axial, distal-directed springing is automatically achieved.

'; * The innovation with further advantageous design options

is described below with reference to the drawing. Show it:

Figure 1 an axial longitudinal section through the cartilage or bone cutter with side view of the distal end,

Figure 2 is an enlarged longitudinal section through part of the length of the divided hollow shaft with the separation point ,,

Figure 3

up to 7 cross-sections according to line A..to B through the separation point with various coupling options,

3a to

7a reduced perspective partial views of the one coupling part at the separation point of the subdivided Hollow shaft.

The cartilage or bone cutter consists in a known manner a tube shaft 1, the distal end of which is closed by a base and is proximally connected to the enlarged proximal housing 3 via the rotating part 2 - the tubular shaft 1 is provided near the distal end with a lateral opening, one edge of which is a counter blade for a forms yet to be described, in the shaft tube rotatably mounted milling head.

In the housing 3, a coupling 4 for the connection of an external drive is rotatably mounted and this coupling is in the tubular shaft 1 matching hollow cutting shaft 5 is connected, which is provided with wall openings χ (Fig.2) at the distal end is whose edges form milling cutting edges that match the edge

the tubular shaft opening 3a work together. It's understandable, that the shape and the position of the recesses x and the cutout 1a adapted to the respective needs will. The hollow shaft 5 is proximally in front of the connection with the drive coupling 4 with a wall opening

6 provided, through which the hollow shaft 5 via an annular space

7 is connected to a connector 8 that can be connected to the negative pressure.

The hollow shaft 5 is in accordance with the innovation outside the range of Ά drive coupling 4 on its length at any point in the lengths 5a and 5b is divided, and this subdivision point-9 the length of parts 5a and 5b are coupled detachably and frictionally with each other. This frictional coupling is achieved in that the mutually facing end walls of the shaft parts 5a and 5b are provided with complementary recesses and projections engaging in one another, which are kept in constant coupling engagement that the hollow cutting shaft 5a, 5b is supported by a spring system 10 (Fig .1) is pressed with the distal end against the distal bottom of the tubular shaft 1.

It is basically advantageous to mitlmög- the tubular shaft 1; lent to be formed with a small diameter, so that accordingly the wall thickness of the hollow cutting shaft 5a, 5b with the inside diameter required by the suction of milled off parts is very great! is small. ° i ^e coupling ^ interlocking

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Projections and recesses are therefore on each other

to bring facing ends of the two cutting shaft parts, there are various options.

In an embodiment of the coupling according to FIGS. 2, 3 and 3a, the wall thickness of the shaft parts 5a and 5b in the area of the coupling can be reinforced at the separation point 9, if this is laid as close as possible to the drive coupling, and the longitudinal part 5b can then on the proximal side by gradation have a cylindrical projection 11 which arrives in a corresponding cylindrical recess in the facing end of the longitudinal part 5a for leading engagement. The wall of the cutting shaft part 5b is for example provided at two _ge genüberllegenden positions with flats 12, which extend the wall from the front end 13 and, accordingly, the facing end of the length portion is provided with two complementary to the flattened portions 12 longitudinally extending Vorsprängen 5a, the clutching in .the Flats come into engagement. In given cases, the cylindrical projection 11 can also be omitted.

In the embodiment according to FIGS. 4 and 4a as well as according to FIGS. 6 and 6a, the length part 5b at the proximal front end can likewise be provided with a cylindrical ring projection 11, but it can also be omitted. It is then starting from the proximal end face 13 of the shaft part 5b with two or four opposing, groove-shaped longitudinally

Recesses 14 provided, the recesses 14 delimiting Side surfaces 14a run parallel to one another or can form a certain angle with one another, while the facing end of the other length part 5a is provided with projections corresponding to the grooves, the coupling engage in the grooves 14. In a similar way, the wall end face 13 of the longitudinal part 5b can be provided with a toothing 15 are provided according to FIGS. 5 and 5a, and in this toothing comes a corresponding toothing of the facing End wall surface of the length part 5a in engagement.

According to a further one corresponding in principle to FIGS. 4 and 4a Possibility according to FIGS. 7 and 7a, go from the proximal wall end face 13 to the opposite axis and conically widening. recess pairs 16 into which corresponding, complementary projections at the facing end of the length part 5a are brought into engagement, and this engagement takes place from the side. If in that case the cutting shaft 5a, 5b with the drive coupling 4 is pulled out of the shaft tube 1, so will in any case the distal length part 5b is carried along, while this part 5b is taken from the shaft tube in the previously discussed embodiments 1 must be brought to slide out separately.

Claims (6)

ΐ .. ί / ίϊ χ Patent Attorneys,:, S Dr. Hugo Wilcken Dlpl.-Ing, Thomas Wilcken Muslerbahn 1 · 2400 Lübeck 1 Applicant: Richard Wolf GmbH, Pforzheimer Str. 24, 7134 Knittlingen Protection claims 1. Cartilage or bone cutter, in which a proximally can be coupled to a drive and can be connected to a negative pressure Hollow shaft as cutting shaft has a milling head at the distal end and in a distally closed tubular shaft is rotatably mounted, which in the area of the milling head through an edge of a tube shaft opening a shearbar forms for the milling head, characterized in that the spring-loaded with the distal end against the distal base of the tubular shaft (1) held hollow shaft (5a, 5b) on their Length is divided at any point by a coupling, which is distributed on the circumference or from frontal incisions or cutouts the wall of one length part and from .in .Eingriff complementary projections or the like of the wall of the other length part that can be brought about with this consists. 2. Milling machine according to claim 1, characterized in that the wall of one length part (5b) of the hollow shaft at its proximal End with at least two flattened areas (12) opposite to the longitudinal axis and formed by wall cutouts and the opposite hitchable end
of the other longitudinal part (5a) of the hollow shaft is provided with longitudinally directed wall projections which are complementary to the flattened areas. 3. Milling machine according to claim 1, characterized in that as
Coupling the wall of the one wavelength part (5b) starting from the proximal end face with at least one axially parallel cutout (14) corresponding to the full one
Thickness or partial thickness of the shaft wall is provided and
that at least one corresponding complementary engaging projection extends from the opposite end face of the other shaft length part (5a). 4. Milling machine according to claim 3, characterized in that the corresponding to the full wall thickness of the hollow shaft (5a, 5b) Cutouts (16) and complementary protrusions from the forehead sides of the two length parts (5a, 5b) extend conically starting. 5. Milling machine according to claim 1, characterized in that the facing Front sides of the two hollow shafts - length parts (5a, 5b) each with an interlocking toothing or Partial teeth are provided. 6. Milling machine according to one of claims 1 to 5, characterized net that the wall of the hollow shaft (5a, 5b) in the area of the two interlocking coupling halves is reinforced.