CN219354288U - Bone knife for repairing and taking out femoral stem - Google Patents

Abstract

The utility model discloses a bone knife for repairing and taking out a femoral stem, which belongs to the technical field of medical appliances, and comprises an inner bone knife, wherein the inner bone knife comprises a first straight body part, and a through groove extending along the length direction of the first straight body part is formed in the first straight body part; the upper end of the first straight body is provided with a first driving connecting part, the lower end of the first straight body is provided with a first bending part, and the lower end of the first bending part is provided with an inward concave arc-shaped cutting edge. In the utility model, the through groove is arranged on the first straight body part of the inner bone knife, so that the inner bone knife can be prevented from being blocked by the femur neck and the parts below the femur neck; the whole arc that is of inboard osteotome accords with thighbone tuberosity and thighbone distance physiology curved characteristic to the lower extreme of first flexion is equipped with the arc cutting edge of indent, thereby makes inboard osteotome can attach on the femoral stem surface, allows inboard osteotome to carry out effective excision around the inboard operation of femoral stem, and the excision is accurate, effectively reduces the bone loss.

Description

Bone knife for repairing and taking out femoral stem

Technical Field

The utility model relates to the technical field of medical appliances, in particular to a bone knife for repairing and taking out a femoral stem.

Background

The human hip joint is a spherical joint comprising a spherical femoral head and a bowl-like acetabulum. It is a joint formed by the femur (femur) and pelvis, both the spherical surface layer and the bowl inner surface layer are covered by smooth acetabular cartilage, and the bursa secretes mucus to minimize friction. When the hip joint is diseased, the acetabular cartilage is not smooth, the synovial capsule is inflamed and atrophic, and the joint can not run freely as usual. When the hip joint is painful, stiff or deformed, even inconvenient to move, due to degeneration, lesions or trauma, and symptoms cannot be relieved by medicines or other treatment methods, the artificial hip joint is replaced for the patient in a surgical mode, so that the patient can recover the daily activity capacity.

The artificial hip joint prosthesis imitates the structure of human hip joint, the handle of the prosthesis is inserted into the marrow cavity of femur, and the head and the joint socket or the metal cup of the prosthesis are utilized to form rotation, so as to realize the flexion, extension and movement of femur. The prosthesis is made of titanium alloy, cobalt-chromium-molybdenum alloy, ceramic, stainless steel and other materials. The hip joint prosthesis, which is made of any material, has a corresponding service life, and after reaching the corresponding service life, the prosthesis needs to be taken out of the human body.

In hip revision surgery, the femoral stem is often required to be removed by enlarging a tuberosity osteotomy to cut off redundant parts, and at present, a straight osteotome is mostly used, however, the straight osteotome is usually blocked by the femoral neck and the part below the femoral neck, so that the femoral stem is difficult to access, excessive bone excision or cortical penetration is easily caused, and a plurality of problems are caused in surgery.

Disclosure of Invention

The utility model aims to solve the technical problem of providing the bone knife for repairing and taking out the femoral stem, which can be attached to the surface of the femoral stem, has precise excision and effectively reduces bone loss.

In order to solve the technical problems, the utility model provides the following technical scheme:

a bone knife for revision removal of a femoral stem, comprising a medial bone knife comprising a first straight body with a through slot extending along a length thereof; the upper end of the first straight body is provided with a first driving connecting part, the lower end of the first straight body is provided with a first bending part, and the lower end of the first bending part is provided with an inward concave arc-shaped cutting edge.

Further, the included angle between the first straight body and the first bending part is 140-160 degrees;

and/or the radian of the arc-shaped cutting edge at the lower end of the first bending part is 170-190 degrees.

Further, the length of the first straight body is 20-40mm;

and/or the length of the first bending part is 10-20mm.

Further, the bone knife for repairing and taking out the femoral stem further comprises an outer bone knife, the outer bone knife comprises a second straight body, the upper end of the second straight body is provided with a second driving connecting part, the lower end of the second straight body is provided with a second bending part, and the lower end of the second bending part is provided with an inward concave arc-shaped cutting edge.

Further, an included angle between the second straight body and the second bending part is 150-170 degrees;

and/or the radian of the arc-shaped cutting edge at the lower end of the second bending part is 150-170 degrees.

Further, the second straight body has a length of 20-40mm;

and/or the length of the second bending part is 10-20mm.

Further, the osteotome for repairing and taking out the femoral stem further comprises a front osteotome and a rear osteotome, the front osteotome and the rear osteotome comprise a third straight body, a third driving connecting part is arranged at the upper end of the third straight body, and a conical cutting edge is arranged at the lower end of the third straight body.

Further, the third straight body part comprises a base dry part positioned at the upper part, a thinning part positioned at the lower part and a transition part positioned between the base dry part and the thinning part, wherein the thickness of the base dry part is 3-7mm, and the thickness of the thinning part is 0.5-1.5mm.

Further, the width of the third straight body is 3-7mm;

and/or the height of the third straight body is 30-60mm.

Further, the first driving connection part, the second driving connection part and the third driving connection part are Hudson interfaces;

and/or the upper part of the first straight body is provided with a jack, a guide rod is inserted into the jack, and the extending direction of the guide rod is the same as that of the first bending part;

and/or the upper part of the second straight body is provided with a jack, a guide rod is inserted into the jack, and the extending direction of the guide rod is the same as the extending direction of the second bending part.

The utility model has the following beneficial effects:

the bone knife for repairing and taking out the femoral stem comprises an inner bone knife, wherein on one hand, the first straight body part of the inner bone knife is provided with a through groove, so that the bone knife can be prevented from being blocked by the femoral neck and the lower part of the femoral neck; on the other hand, the lower extreme of first straight body portion is equipped with first bending portion, makes inboard osteotome wholly be the arc, accords with the thighbone tuberosity and thighbone distance physiology curved characteristic to the lower extreme of first bending portion is equipped with the arc cutting edge of indent, thereby makes inboard osteotome can attach on the femoral stem surface, allows inboard osteotome to carry out effective excision around the inboard operation of femoral stem, and the excision is accurate, effectively reduces the bone loss.

Drawings

FIG. 1 is a schematic view of the front structure of a medial osteotome of the present utility model;

FIG. 2 is a schematic side view of a medial osteotome of the present utility model;

FIG. 3 is a schematic view of the back side structure of the medial osteotome of the present utility model;

FIG. 4 is a schematic view showing the front structure of a lateral bone knife according to the present utility model;

FIG. 5 is a schematic side view of a lateral bone knife according to the present utility model;

FIG. 6 is a schematic view of the back side structure of the lateral bone knife according to the present utility model;

FIG. 7 is a schematic diagram of the front structure of the anterior-posterior osteotome of the present utility model;

FIG. 8 is a schematic side view of the anterior-posterior osteotome of the present utility model;

fig. 9 is a schematic view showing a modified structure of the medial osteotome of the present utility model.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

The present utility model provides a bone knife for revision removal of a femoral stem, as shown in fig. 1-3, comprising a medial bone knife 1 (for manipulation of the medial side of the femoral stem), wherein:

the medial osteotome 1 comprises a first straight body 11, and the first straight body 11 is provided with a through groove 15 extending along the length direction;

the first straight body 11 has a first drive connection 12 at its upper end for connecting a handle or power tool, a first curved portion 13 at its lower end, and a concave arcuate blade 14 at the lower end of the first curved portion 13.

The bone knife for repairing and taking out the femoral stem comprises an inner bone knife, wherein on one hand, the first straight body part of the inner bone knife is provided with a through groove, so that the bone knife can be prevented from being blocked by the femoral neck and the lower part of the femoral neck; on the other hand, the lower extreme of first straight body portion is equipped with first bending portion, makes inboard osteotome wholly be the arc, accords with the thighbone tuberosity and thighbone distance physiology curved characteristic to the lower extreme of first bending portion is equipped with the arc cutting edge of indent, thereby makes inboard osteotome can attach on the femoral stem surface, allows inboard osteotome to carry out effective excision around the inboard operation of femoral stem, and the excision is accurate, effectively reduces the bone loss. The utility model is suitable for hip revision surgery and is used for cutting redundant bone or other tissues.

The angle α1 between the first straight body 11 and the first curved portion 13 may be 140-160 degrees, such as 145, 150, 155 degrees, etc., to better accommodate the medial femoral curvature. The arc β1 of the arc-shaped blade 14 at the lower end of the first bending portion 13 may be 170-190 degrees, such as 175, 180, 185 degrees, etc., so as to conform to the contour of the inner shape of the femoral stem, and better conform to the femoral stem.

The length L1 of the first straight body 11 may be 20-40mm, for example 30mm; the length L2 of the first curved portion 13 may be 10-20mm, for example 15mm, in which case the use is optimal.

Further, the bone knife for repairing and taking out a femoral stem according to the present utility model may further comprise a lateral bone knife 2 (for manipulating the lateral side of the femoral stem), wherein, as shown in fig. 4 to 6, the lateral bone knife 2 comprises a second straight body 21, the upper end of the second straight body 21 is provided with a second driving connection portion 22 for connecting a handle or a power instrument, the lower end is provided with a second bending portion 23, and the lower end of the second bending portion 23 is provided with an inward concave arc-shaped blade 24.

The outer bone knife is integrally arc-shaped, can effectively outline the shoulder of the femoral stem, has an arc-shaped cutting edge which is concave and is easy to enter the intramedullary cavity along with the femoral stem to cut bone.

The angle α2 between the second straight body 21 and the second curved portion 23 may be 150-170 degrees, for example 160 degrees; the arc β2 of the arcuate blade 24 at the lower end of the second curved portion 23 may be 150-170 degrees, for example 160 degrees, to better accommodate the shape of the femoral stem.

The length L3 of the second straight body 21 may be 20-40mm, for example 30mm; the length L4 of the second curved portion 23 may be 10-20mm, for example 15mm, in which case the use is optimal.

In addition, the osteotome for revision removal of a femoral stem of the present utility model may further include an anteroposterior osteotome 3 (for manipulating anterior and posterior positions of the femoral stem), the anteroposterior osteotome 3 including a third straight body 31, as shown in fig. 7 to 8, the third straight body 31 having a third driving connection portion 32 at an upper end thereof for connection to a handle or a power tool, and a tapered blade 34 at a lower end thereof.

The anterior and posterior osteotome is of conventional straight design, which facilitates the treatment of the relatively flat anterior and posterior surfaces of the femoral stem.

The third straight body 31 preferably includes a base portion 311 at an upper portion, a thinned portion 313 at a lower portion, and a transition portion 312 between the base portion 311 and the thinned portion 313, the thickness of the base portion 311 being 3-7mm, and the thickness of the thinned portion 313 being 0.5-1.5mm. Therefore, the front and rear bone knives adopt a straight line ultrathin design and a taper cutting edge, and can smoothly enter the marrow cavity along the surface of the femoral stem to remove bone fragments.

The width of the third straight body 31 may be 3-7mm, for example 5mm; the height H of the third straight body 31 may be 30-60mm, for example 50mm, where the use is optimal.

In each of the above bone knives, the first, second and third drive connections 12, 22 and 32 may each be Hudson interfaces to facilitate quick connection and disconnection with external power instruments.

In the modified embodiment shown in fig. 9, the upper portion of the first straight body 11 of the medial osteotome 1 may be provided with a receptacle 16, with a guide bar 17 interposed in the receptacle 16, the guide bar 17 extending in the same direction as the first curved portion 13. In the hip revision surgery, the blade goes deep into the intramedullary canal, which results in that the doctor cannot accurately judge the included angle between the blade and the femoral stem, and thus cannot accurately judge the osteotomy amount, and by installing the guide rod 17 on the first straight body 11, reference can be provided for the doctor in the surgery, so that accurate osteotomy control can be realized.

Similarly, the outer osteotome 2 may be modified as described above (not shown, see fig. 9), i.e., the upper portion of the second straight body 21 may be provided with a receptacle into which a guide rod is inserted, the guide rod extending in the same direction as the second curved portion 23.

While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.

Claims (10)

1. The bone knife for repairing and taking out the femoral stem is characterized by comprising a medial bone knife, wherein the medial bone knife comprises a first straight body part, and a through groove extending along the length direction of the first straight body part is formed in the first straight body part; the upper end of the first straight body is provided with a first driving connecting part, the lower end of the first straight body is provided with a first bending part, and the lower end of the first bending part is provided with an inward concave arc-shaped cutting edge.

2. The bone knife for revision removal of a femoral stem of claim 1, wherein the included angle between said first straight body and first curved portion is 140-160 degrees;

and/or the radian of the arc-shaped cutting edge at the lower end of the first bending part is 170-190 degrees.

3. The bone knife for revision removal of a femoral stem of claim 1, wherein said first straight body has a length of 20-40mm;

and/or the length of the first bending part is 10-20mm.

4. The bone knife for revision removal of a femoral stem of claim 1, further comprising a lateral bone knife comprising a second straight body having a second drive connection at an upper end and a second curved portion at a lower end, the second curved portion having a concave arcuate blade at a lower end.

5. The bone knife for revision removal of a femoral stem of claim 4, wherein the included angle between said second straight body and second curved portion is 150-170 degrees;

and/or the radian of the arc-shaped cutting edge at the lower end of the second bending part is 150-170 degrees.

6. The bone knife for revision removal of a femoral stem of claim 4 wherein said second straight body has a length of 20-40mm;

and/or the length of the second bending part is 10-20mm.

7. The bone knife for revision removal of a femoral stem of claim 4 further comprising an anterior-posterior bone knife comprising a third straight body with a third drive connection at an upper end and a tapered blade at a lower end.

8. The bone knife for revision removal of a femoral stem of claim 7, wherein said third straight body includes a base portion at an upper portion, a thinned portion at a lower portion, and a transition portion between said base portion and thinned portion, said base portion having a thickness of 3-7mm, said thinned portion having a thickness of 0.5-1.5mm.

9. The bone knife for revision removal of a femoral stem of claim 7 wherein said third straight body has a width of 3-7mm;

and/or the height of the third straight body is 30-60mm.

10. The bone knife for revision removal of a femoral stem of claim 7, wherein said first, second, and third drive connections are Hudson interfaces;

and/or the upper part of the first straight body is provided with a jack, a guide rod is inserted into the jack, and the extending direction of the guide rod is the same as that of the first bending part;

and/or the upper part of the second straight body is provided with a jack, a guide rod is inserted into the jack, and the extending direction of the guide rod is the same as the extending direction of the second bending part.