FR3043545A1 - FEMALE TEST COLLAR - Google Patents

Abstract

The invention relates to a femoral neck (1) comprising: (i) a base (2) having a barrel (30), a plate (21) and means for assembling a femoral rasp (6), ( ii) a pin (4) having a conical proximal portion (43) for receiving a femoral test head (7), the pin (4) being adapted to be fitted on the barrel (30), and (iii) retainer means configured to retain the spindle (4) in the barrel (30), and to adjust the distance between the proximal portion (43) of the spindle (4) and the platen (21).

Description

The present invention relates to a femoral neck test for the establishment of a femoral stem.

Traditionally, when a practitioner wants to set up a femoral stem, he begins by digging the femoral canal using a femoral rasp.

All graters used have the geometry of a femoral stem.

The intramedullary cavity made by the practitioner depends on the anatomy of each patient and it is necessary for the practitioner to be able to control the volume that will occupy the selected hip prosthesis with respect to the patient's anatomy.

To do this, the practitioner can use the rasp as a test stand on the basis of which he can add a femoral neck test.

However, there are a large number of dimensions of prosthetic collars, which vary according to the dimensions of the femoral stem chosen.

Thus, there are classically three main varieties of hip prostheses: so-called standard prostheses, prostheses with a high offset (called "High Offset" prostheses) and lateralized prostheses.

Most often each variety is declined in ten sizes.

Thus, all varieties offer a range of about thirty femoral necks.

However, a practitioner can not use as many test femoral necks to control the volume of the extra-medullary part of the hip prosthesis.

In this technical context, an object of the present invention is to provide a femoral neck test, which allows testing all varieties and sizes of femoral necks, requiring few parts.

According to a general definition, the invention relates to a femoral neck test comprising (i) a base having a barrel, a plate and means of assembly to a femoral rasp, (ii) a pin having a conical portion for receiving a femoral test head, the spindle being adapted to be fitted on the barrel, and (iii) retaining means configured to retain the spindle in the barrel, and to adjust the distance between the conical portion of the spindle and platinum.

Thus, the invention provides a femoral neck test that can test all varieties and sizes of femoral necks requiring few parts.

Indeed, the use of retaining means which allow the adjustment of the distance between the proximal portion of the spindle and the platen, makes it possible to test several configurations of sizes and varieties of femoral necks without changing femoral neck test.

In addition, the retaining means comprise an axis of the spindle. The axis is designed to be positioned in the barrel.

Thus, the pin can be easily fitted into the barrel.

In addition, the retaining means comprise a plurality of notches distributed in the barrel along a longitudinal axis of the barrel.

The notches distributed in the barrel make it possible to easily and reliably adjust the position of the spindle relative to the plate. The axis has at least one locking ball designed to be positioned in a notch of the barrel, to retain the pin in the barrel.

This is a particularly advantageous arrangement of the invention.

Indeed, said at least one locking ball locks the pin in a selected slot of the barrel.

Thus, said at least one locking ball and the notches allow to adjust the position of the pin relative to the plate.

Preferably, the notches can be distributed in a variable pitch along the longitudinal axis of the barrel.

Thus, it is possible to vary the position of the spindle relative to the platen.

In addition, the barrel may have a polygonal outer shape with many facets.

A notch can be positioned next to each facet.

The position of a notch facing each facet makes it easy to locate the position of the notches and thus easily adjust the position of the pin relative to the plate.

In addition, each facet may have a visual cue and the pin may have a window designed to allow vision of a visual cue when the pin is retained in the barrel.

The visual cue may advantageously allow a practitioner to know the femoral neck size corresponding to each setting of the position of the spindle relative to the platen.

According to one embodiment, the pin comprises a button for controlling said at least one locking ball to control the retention of the pin in the barrel.

For a good understanding, the invention is described with reference to the accompanying drawings showing by way of non-limiting example several embodiments of a femoral neck trial according thereto. FIG. 1 is a perspective view of a femoral neck test according to the invention; - Figure 2 is a perspective view of a base having even visual cues; - Figure 3 is a cross-sectional view of the base of Figure 2; - Figure 4 is a perspective view of a base having odd visual references, according to a second embodiment; - Figure 5 is a perspective view of a lateralised base, having odd visual references, according to a third embodiment; FIG. 6 is a front view of a spindle of standard length; FIG. 7 is a front view of a pin, according to a second embodiment, with a high offset (high offset); Figure 8 is a cross-sectional view of a femoral neck test with a femoral head test; FIG. 9 is a front view of a femoral neck test, provided with a trial femoral head and assembled with a femoral rasp.

The femoral neck test 1 illustrated in Figure 1 comprises two elements namely: a base 2 and a pin 4. The base 2 comprises an oblong plate 21.

The plate 21 has a lower face 22 and an upper face 23.

The lower face 22 receives a fixation assembly intended to be engaged on a proximal end 62 of a femoral rasp 6. The fixing assembly of the lower face 22 comprises a rib 24 and a snap-fitting element 25 which has a parallelepipedal shape. The snap-on element 25 has two notches 26, respectively positioned on two opposite walls of the snap-on parallelepiped 25.

In addition, the snap-on element 25 comprises a detent ball 27, positioned respectively on another wall of the snap-on parallelepiped 25.

The upper face 23 of the plate 21 receives a barrel 30.

According to the embodiment presented here, the barrel 30 has a polygonal geometry having seven facets 31.

In addition, the barrel 30 includes a longitudinal bore 32.

As can be seen in Figure 3, the axis of the bore 32 belongs to the median plane of the base.

In addition, according to the embodiment presented here, the barrel 30 comprises a series of seven notches 33 distributed in a variable pitch and opening into the bore 32.

Thus, the seven notches 33 are distributed along the bore 32 at different distances from the upper face 23 of the plate 21.

According to the embodiment presented here, the barrel 30 has seven facets 31 and seven notches 33. Nevertheless, it is conceivable that the barrel 30 has a different number of facets 31 and notches 33.

As can be seen in Figure 2, each notch 33 opens into a respective facet 31.

In addition, each facet 31 has a numeral mark 34 which makes it possible to indicate to a practitioner the equivalence between the position of a notch 33 and the size of a corresponding prosthetic femoral neck.

The barrel 30 can be provided with 34 pairs of numerical markers, as can be seen in FIG.

However, according to a second embodiment, the barrel 30 may be provided with odd numerical markers 34, as can be seen in FIG. 4.

Thus, a practitioner may have a base 2, the barrel 30 has 34 pairs of numerical landmarks, and a base 2 whose barrel 30 has odd numerals 34.

Furthermore, Figures 1 to 4 illustrate two so-called "standard" embodiments of the base 2.

According to these embodiments, the barrel 30 has a so-called "standard" rating which allows the femoral neck test 1 to be comparable to a femoral neck of standard dimensions.

In addition, according to a third embodiment shown in FIG. 5, the base 2 may have geometrical characteristics enabling the femoral neck of trial 1 to correspond to a lateralized femoral neck.

According to this third embodiment, the barrel 30 is positioned on the proximal face 23 near one of the rounded ends of the oblong plate 21.

In addition, according to this embodiment the barrel 30 has a rating greater than the so-called standard dimension.

Likewise, according to this embodiment, the notches 33 are positioned at greater distances from the upper face 23 of the plate 21, than the notches 33 positioned according to the "standard" embodiments presented in FIGS. 1 to 4.

Pin 4 comprises a tubular element 41 and an axis 42.

As illustrated in FIGS. 6 to 8, the tubular element 41 has a conical portion 43 surmounting a cylindrical portion 44.

The conical portion 43 is intended to receive a trial femoral head 7, as can be seen in FIG. 8.

The cylindrical portion 44 includes a window 45. In use, as will be explained later, the window 45 allows a practitioner to visualize a numeral 34 of the barrel 30 when positioning the pin 4 on the base 2.

As shown in FIG. 8, the axle 42 has a lower rod 46, a shoulder 47 and an upper rod 48.

The lower rod 46 is designed to be inserted into the bore 32.

The lower rod 46 of the shaft 42 has two locking balls 50.

The locking balls 50 are designed to be positioned in a notch 33 so as to lock the position of the pin 42 in the bore 32.

According to the embodiment shown in Figures 6 and 7, the lower rod 46 has two diametrically opposed locking balls 50.

The upper rod 48 is slidably mounted in the tubular element 41. The shoulder 47 is positioned between the lower rod 46 and the upper rod 48. The shoulder 47 is adapted to abut against an inner shoulder 55 of the tubular element 41. .

In addition, one end of the upper rod 48 has a control knob 49. In use, the control knob 49 controls the engagement of a locking ball 50 in a notch 33.

In addition, FIG. 6 shows a so-called "standard" embodiment of pin 4. According to this embodiment, the axis 42 has a so-called standard dimension adapted to be used with a standard type socket, illustrated on FIG. Figures 2 and 3.

FIG. 7 shows another high-offset embodiment of pin 4. According to this embodiment, the axis 42 has a rating greater than the so-called standard dimension.

The lateralised pin 4 is adapted to be used with a base 2, illustrated in FIG.

The femoral neck test 1 can be used as follows.

During a hip prosthesis fitting operation, the practitioner digs the femoral canal using a femoral rasp 6, shown in FIG. 9.

The femoral rasp 6 has the shape of an intramedullary assembly of a hip prosthesis.

As can be seen in Figure 9, the proximal end of the femoral rasp 6 has a groove 61 and two oblong openings 62, each positioned on an opposite surface. In use, each femoral rasp 6 corresponds to a femoral implant size. For example, a femoral rasp 6 of size three corresponds to a size three femoral implant.

Thus, if a practitioner wishes to test, for example, a size three implant, he uses an odd base 2.

The practitioner begins by positioning a pin 4 in the base 2.

The positioning of the pin 4 in the base 2 is performed by introducing the lower rod 46 into the bore 32.

The window 45 allows the practitioner to visualize the numeral 34 corresponding to the size of a corresponding femoral neck.

In the case, for example, of testing a size three implant, the practitioner positions the pin 4 so that the window 45 is positioned on the number three.

The practitioner can then use the control button 49 to lock the locking balls 50 in the notches 33 corresponding. The exercise of a pressure on the control button 49 makes it possible to unlock the locking balls 50.

When the control button 49 is released, the locking balls 50 can be locked in a notch 33.

The practitioner can then assemble the base 2 provided with the pin 4 to the femoral rasp 6. The assembly of the base 2 to the femoral rasp 6 is performed by positioning the rib 24 in the groove 61 and positioning the ball d 23 if it is not satisfied with the result and wishes to try a larger implant, the practitioner can remove the base 2 provided with the pin 4 of the femoral rasp 6.

Then, the practitioner can extract the femoral rasp 6 from the medullary canal and replace it with a femoral rasp 6 of larger size.

The practitioner can then repeat the test using a base 2 pair or odd adapted to the size of the rasp 6.

The practitioner then positions the pin 4 as previously described.

Thus, the invention provides a femoral neck test that can test all varieties and sizes of femoral necks requiring few parts.

Of course, the invention is not limited to the embodiments shown above, but it embraces all the embodiments.

Claims (9)

1. Femoral femoral neck (1) comprising (i) a base (2) having a barrel (30) fixed to a plate (21) and means of assembly to a femoral rasp (6), (ii) a pin (4) having a tapered portion (43) for receiving a test femoral head (7), the pin (4) being adapted to be fitted on the barrel (30), and (iii) configured retaining means for holding the spindle (4) in the barrel (30) and for adjusting the distance between the conical portion (43) of the spindle (4) and the platen (21). 2. Femoral femoral neck (1) according to claim 1, characterized in that the retaining means comprise an axis (42) of the spindle (4), the axis (42) being designed to be positioned in the barrel (30). 3. Femoral femoral neck (1) according to claim 2, characterized in that the retaining means comprise a plurality of notches (33) distributed in the barrel (30) along a longitudinal axis of the barrel (30). ). 4. Femoral femoral neck (1) according to claim 3, characterized in that the axis (42) has at least one locking ball (50) designed to be positioned in a notch (33) of the barrel (30). , to retain the pin (4) in the barrel (30). 5. Femoral femoral neck (1) according to one of claims 3 or 4, characterized in that the notches (33) are distributed in a variable pitch along the longitudinal axis of the barrel (30). 6. Femoral femoral neck (1) according to one of claims 2 to 5, characterized in that the barrel (30) has a polygonal outer shape having a plurality of facets (31). 7. Femoral femoral neck (1) according to claim 6, characterized in that a notch (33) is positioned opposite each facet (31). 8. Femoral femoral neck (1) according to claim 7, characterized in that each facet (31) has a visual cue (34) and the pin (4) has a window (45) designed to allow the vision of a visual cue (34) when the pin (4) is retained in the barrel (30). 9. Femoral femoral neck (1) according to one of claims 4 to 8, characterized in that the pin (4) comprises a control knob (49) of said at least one locking ball (50), for control the retention of the spindle (4) in the barrel (30).