CN201939536U - Artificial semipelvic prosthesis for recovering continuity from lumbosacral vertebrae to hip joint - Google Patents

Abstract

The utility model discloses an artificial semi-pelvic prosthesis for restoring the continuity from the lumbosacral vertebra to the hip joint. The artificial half pelvis prosthesis comprises a metal acetabular cup and at least two metal rods connected with the metal acetabular cup. The utility model aims to provide an artificial semi-pelvic prosthesis with simple operation and stable fixation. It can well reconstruct the bony defect after extensive pelvic tumor resection, especially in the case of total ilium resection or including sacroiliac joint resection. The utility model adds three metal holes on the outside of the metal acetabulum, which are connected with a special connector through screws, and after the connection, the upper part of the metal rod is fixed to the pedicle screw fixed in front of the lumbosacral vertebrae. The reconstruction of the continuity from the lumbosacral vertebrae to the hip joint is realized, the stress transmission from the waist to the lower extremities is well restored, and the upward movement and loosening of the artificial hemipelvic prosthesis are effectively prevented. It is currently the most biomechanical solution for reconstruction after extensive tumor resection of the pelvis, and the initial clinical results are satisfactory.

Description

An artificial hemipelvic prosthesis for restoring continuity from the lumbosacral spine to the hip joint

technical field

The utility model relates to an artificial prosthesis, in particular to a set of reconstruction system for reconstruction after resection of hemipelvic tumors involving the ilium or/and sacroiliac joints and hip joints. Complete the reconstruction of mechanical transmission from the lumbosacral region to the hip joint; specifically, it involves an artificial half-pelvic prosthesis.

Background technique

Pelvic tumors are relatively common, accounting for about 3%-4% of primary bone tumors. Malignant tumors often develop latently, and some take a long time from the first symptoms to a clear diagnosis. High-grade malignant tumors stimulate adjacent nerves, which can cause severe pain, which is unbearable for the patient and can't sleep all night, so strong analgesics must be used. Removal of the tumor is necessary to relieve symptoms. Twenty years ago, the main treatment for malignant pelvic tumors was hemipelvic amputation. Although the tumor was completely resected, the patient lost one lower limb, which not only lost function, but also suffered a great blow mentally. How to preserve the function of limbs while treating tumors is an important issue for surgeons to consider. Modular artificial half pelvis is an ideal reconstruction method at present. It can assemble the prosthesis on site according to the size of the bone defect after resection, and the installation is very convenient. Its small size is convenient for soft tissue coverage, and the wound infection rate is greatly reduced. At the same time, it can achieve relatively stable fixation in the early stage and retain better hip joint function.

However, the existing design of modular hemipelvic prosthesis can only be used for cases with partial ilium retention. For the large-scale tumor involvement, complete ilium defect, and even the reconstruction after sacroiliac joint resection, there has been no good reconstruction. method. At present, the main solution to this situation is to repair the excised femoral head into a square column, plant it next to the remaining ilium, fix it to the sacrum with nails, and then clamp the artificial half-pelvic prosthesis under the bone graft. However, the stability of the prosthesis placed by this method is relatively poor, and patients need to stay in bed for more than 3 months before they can gradually get out of bed and do small amount of weight-bearing activities, which seriously affects the quality of life of patients.

Utility model content

The purpose of the utility model is to provide an artificial half pelvis prosthesis.

The artificial semi-pelvic prosthesis provided by the utility model comprises a metal acetabular cup and at least two metal rods connected with the metal acetabular cup.

The metal acetabular cup is provided with at least one joint with holes; one end of the metal rod is provided with a hole corresponding to the shape and size of the hole of the joint; the metal acetabular cup and the metal rod are inserted into the joint through bolts The holes on the metal rod and the holes on the metal rod are connected by bolts.

The above joint is preferably integrally formed with the metal acetabular cup.

Above-mentioned metal rod can be 2 or 3.

There may be 2 or 3 joints mentioned above.

The utility model aims to provide an artificial semi-pelvic prosthesis with simple operation and stable fixation. It can well reconstruct the bony defect after extensive pelvic tumor resection, especially in the case of total ilium resection or including sacroiliac joint resection. In the utility model, two or three metal holes are added on the outside of the metal acetabulum, which are connected with a special connector through screws, and the upper part of the metal rod is fixed to the pedicle screw fixed in front of the lumbosacral vertebra after the connection. The reconstruction of the continuity from the lumbosacral vertebrae to the hip joint is realized, the stress transmission from the waist to the lower extremities is well restored, and the upward movement and loosening of the artificial hemipelvic prosthesis are effectively prevented. It is currently the most biomechanical solution for reconstruction after extensive tumor resection of the pelvis, and the initial clinical results are satisfactory.

Description of drawings

Fig. 1 is the schematic diagram of the utility model.

Detailed ways

The utility model will be further described below in conjunction with specific examples, but the utility model is not limited to the following examples.

In the following examples, unless otherwise specified, all are conventional methods.

Example 1

As shown in Fig. 1, the artificial hemipelvic prosthesis provided by the utility model comprises two metal rods 2 and a metal acetabular cup 1 with two joints 3. One end of the metal rod 2 is a plate-shaped structure with a through hole, and the diameter of the rod can be 5.5 mm and 6.0 mm. The joint 3 and the metal acetabular cup 1 are integrally formed. The two metal rods 2 are connected with the two joints 3 of the metal cup 1 by bolts. The specific method of the above-mentioned bolt connection is: another through hole is provided on the joint 3, and the shape and size of the through hole of the joint are the same as that of the metal rod 2. The shape and size of the holes are corresponding, and the bolt connection can be realized by inserting the bolt into the through hole of the joint and the through hole of the metal rod and matching the nut. The end of the metal rod 2 away from the through hole has no special structure, and can be fixedly connected with the pedicle screw after being cut at an appropriate length.

During specific use, pedicle screws are first implanted in the vertebral body of the sacrum or the lower lumbar vertebrae, and then the artificial semi-pelvic prosthesis of the present invention (the prosthesis after the metal rod is connected with the metal cup) is implanted, and the metal rod is adjusted. The curvature of the rod 2 makes the metal acetabular cup 1 close to the normal anatomical position, and then the end of the metal rod 2 away from the metal acetabular cup is directly connected to the groove of the pedicle screw through a nut. After reconfirming the position of the artificial hemipelvic prosthesis, the connection of the entire prosthesis can be completed.

Claims (6)

1. The artificial hemipelvic prosthesis is characterized in that: it comprises a metal acetabular cup and at least two metal rods connected with the metal acetabular cup. 2. artificial hemipelvic prosthesis as claimed in claim 1, is characterized in that: described metal acetabular cup is provided with at least one joint with holes; Corresponding holes; the metal acetabular cup and the metal rod are inserted into the holes on the joint and the holes on the metal rod through bolts to realize bolt connection. 3. The artificial hemipelvic prosthesis according to claim 2, characterized in that: the joint is integrally formed with the metal acetabular cup. 4. The artificial half-pelvis prosthesis according to claim 2 or 3, characterized in that: there are 2 or 3 metal rods. 5. The artificial half-pelvic prosthesis according to claim 2 or 3, characterized in that: there are 2 or 3 joints. 6. The artificial half-pelvic prosthesis according to claim 4, characterized in that: there are 2 or 3 joints.

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