Universal intramedullary nail for pelvis percutaneous internal fixation

Abstract

The utility model relates to a universal intramedullary nail for pelvis percutaneous internal fixation, which belongs to the technical field of orthopedic medical instruments and is characterized in that the tip of the universal intramedullary nail is a three-blade tip; a hollow channel is formed in the general intramedullary nail, penetrates through the two ends of the general intramedullary nail and is used for allowing a guide needle to penetrate through; threads are arranged on the outer wall of the universal intramedullary nail, and the sparse degree of the threads gradually changes from the nail tail of the universal intramedullary nail to the three-blade tip end to form gradually-changed threads. The general intramedullary nail for pelvic percutaneous internal fixation is widely applied to percutaneous nail placement internal fixation operations and is used for penetrating pelvic bones except for suprapubis ramus and part of iliac, including inferior pubis ramus, ischium, iliac, sacroiliac joints and sacroiliac vertebral bodies.

Description

Technical Field

[0001] The utility model relates to the technical field of orthopedic medical instruments, in particular to a universal intramedullary nail for percutaneous internal fixation of the pelvis. Background Art

[0002] Surgical treatment of pelvic bone metastasis requires the use of fixation nails. For example, the utility model application with application number 202311786273.9 discloses an in vitro guide frame for percutaneous internal fixation and strengthening of intramedullary nails around the acetabulum, including a universal guide frame, the universal guide frame includes an arc component, the arc component includes a left arc guide plate, an intermediate guide plate and a right arc guide plate, and the two ends of the intermediate plate are detachably connected to the left arc guide plate and the right arc guide plate, respectively, and spliced ​​into an arc component; a cross-column nail catheter and a front column nail catheter are provided on the left arc guide plate or the right arc guide plate, and the intermediate plate is connected to at least one arc rod, and a rear column nail catheter is fixed at the end of the arc rod; three internal fixation and strengthening intramedullary nails that are interlaced in space and arranged like a tripod are respectively inserted into the pelvic bone around the diseased acetabulum through the cross-column nail catheter, the front column nail catheter and the rear column nail catheter, which can immediately and significantly relieve the patient's pain symptoms and restore motor function. The three internal fixation and reinforcement intramedullary nails are: cross-column nail, posterior column nail and anterior column nail. The cross-column nail refers to: passing through one of the points between the anterior superior iliac spine and the anterior inferior iliac spine of the affected ilium, and taking this as the starting point, passing through the top of the acetabulum, along the cancellous bone of the greater sciatic notch to reach the sacroiliac joint but not passing through the articular surface. The posterior column nail refers to: passing through the ischial tuberosity of the buttocks, and starting from the sciatic tuberosity of the ischial tuberosity, along the inside of the sciatic ramus bone, passing through the posterior wall of the acetabulum, and passing to the proximal end of the greater sciatic notch but not passing through the cortical bone.

[0003] Although the utility model application with application number 202311786273.9 discloses an extracorporeal guide frame for percutaneous internal fixation around the acetabulum to strengthen the intramedullary nail, which can assist the intramedullary nail to be percutaneously fixed around the acetabulum, it still requires a matching intramedullary nail. Only when the intramedullary nail is used in conjunction with the extracorporeal guide frame can the intramedullary nail be percutaneously inserted into the body and fixed around the acetabulum. However, there is currently no special intramedullary nail on the market specifically for pelvic metastatic cancer that can be used as a cross-column nail and posterior column nail of the extracorporeal guide frame, which restricts the promotion and application of minimally invasive surgery for pelvic bone metastatic cancer. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a universal intramedullary nail for percutaneous fixation of the pelvis, which is used to solve the problem that there are currently no special intramedullary nails on the market specifically for pelvic metastatic cancer that can be used as a cross-column nail and a posterior column nail of an extracorporeal guide frame, which restricts the promotion and application of minimally invasive surgical operations for pelvic bone metastatic cancer.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a universal intramedullary nail for percutaneous fixation of the pelvis, the tip of the universal intramedullary nail being a three-blade tip; a hollow channel is arranged inside the universal intramedullary nail and the hollow channel runs through both ends of the universal intramedullary nail for inserting a guide pin; a thread is arranged on the outer wall of the universal intramedullary nail, and the thread sparseness gradually changes from the nail tail of the universal intramedullary nail to the three-blade tip to form a gradient thread.

[0007] Preferably, the gradual thread is dense at the front and sparse at the back, and the three-blade tip, the nail body of the intramedullary nail and the nail tail are integrated; and the nail tail thread is tight to facilitate the fixation of the nail tail and the cortical bone; the three-blade tip is a self-tapping nail tip so that it can self-drill into the bone.

[0008] Preferably, the universal intramedullary nail has a thick tail and tight threads for fixing on the cortical bone to enhance firmness; the threads in the area near the three-blade tip of the universal intramedullary nail are tight, while the threads in the area between the tail and the three-blade tip of the universal intramedullary nail are relatively sparse.

[0009] Preferably, the end surface of the nail tail of the universal intramedullary nail is provided with a hexagonal hole for inserting a hexagonal tool to tighten the nail tail of the universal intramedullary nail and fix the nail tail of the universal intramedullary nail on the cortical bone.

[0010] Preferably, a reverse hook groove is provided on the thread of the universal intramedullary nail, which is used to increase the holding force by increasing the contact area with the bone body.

[0011] Preferably, a bone cement outflow hole is opened on the side wall of the front end of the universal intramedullary nail, and the bone cement outflow hole is connected to the hollow channel of the universal intramedullary nail for flowing out bone cement to fill the gap between the universal intramedullary nail and the cortical bone or the lesion area of ​​the cancellous bone.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model provides a universal intramedullary nail for percutaneous fixation of the pelvis, the tip of the universal intramedullary nail being a three-blade tip; a hollow channel is arranged inside the universal intramedullary nail and the hollow channel runs through both ends of the universal intramedullary nail for inserting a guide pin; a thread is arranged on the outer wall of the universal intramedullary nail, and the sparseness of the thread gradually changes from the nail tail of the universal intramedullary nail to the three-blade tip to form a gradual thread. The universal intramedullary nail for percutaneous internal fixation of the pelvis disclosed by the utility model is widely used in percutaneous nail placement and internal fixation surgery. For example, in addition to using the universal intramedullary nail in conjunction with an extracorporeal guide frame for percutaneous internal fixation around the acetabulum to strengthen the intramedullary nail, and performing percutaneous nail placement and internal fixation surgery, it can be used as a cross-column nail and a posterior column nail, and the cross-column nail guide pin and the posterior column nail guide pin are respectively inserted into the pelvis. In addition, it can also be used to penetrate the pelvis other than the superior pubic ramus, including the inferior pubic ramus, ischium, ilium, sacroiliac joint and sacral vertebral body. When the universal intramedullary nail penetrates the inferior pubic ramus, it is used as a inferior pubic ramus nail, when it penetrates the ilium or sacral vertebral body, it is used as an iliac wing nail, and when it penetrates the sacroiliac joint, it is used as a sacroiliac joint nail, etc. The universal intramedullary nail for percutaneous internal fixation of the pelvis disclosed by the utility model is used in conjunction with an extracorporeal guide frame for percutaneous internal fixation around the acetabulum to strengthen the intramedullary nail, and percutaneous nailing internal fixation surgery for pelvic metastatic cancer is performed. This has the advantages of less trauma, fewer complications and lower cost, and can quickly and effectively relieve the patient's symptoms, allowing the patient to resume daily life as soon as possible, thereby continuing to connect with systemic treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall external structure of a universal intramedullary nail for percutaneous fixation of the pelvis provided in Example 1 of the utility model;

[0015] Figure 2 It is a top view of a universal intramedullary nail for percutaneous fixation of the pelvis provided in Example 1 of the utility model;

[0016] Figure 3 It is a three-dimensional view of the tip of the universal intramedullary nail for percutaneous fixation of the pelvis provided in Example 1 of the utility model;

[0017] Figure 4 It is a partial enlarged view of the external structure of the area where the gradual thread of the universal intramedullary nail for percutaneous fixation of the pelvis provided in Example 1 of the utility model is located;

[0018] Figure 5 yes Figure 4 A cross-sectional view of the area where the gradual thread is located.

[0019] Figure 6 It is a schematic diagram of the application of the universal intramedullary nail for percutaneous fixation of the pelvis provided in Example 1 of the utility model in the pelvis.

[0020] Description of reference numerals: 1-universal intramedullary nail, 10-triple-edged tip, 11-nail tail;

[0021] 21-reverse hook groove, 22-bone cement outflow hole;

[0022] 100-hollow channel, 101-hexagon socket hole. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0024] In order to solve the problem that there is currently no special intramedullary nail for pelvic metastatic cancer on the market that can be used as a cross-column nail and a posterior column nail of an extracorporeal guide frame, which restricts the promotion and application of minimally invasive surgical operations for pelvic bone metastatic cancer, the utility model provides a universal intramedullary nail for percutaneous fixation of the pelvis, the tip of the universal intramedullary nail is a three-blade tip; a hollow channel is provided inside the universal intramedullary nail and the hollow channel runs through both ends of the universal intramedullary nail for inserting a guide needle; a thread is provided on the outer wall of the universal intramedullary nail, and from the nail tail of the universal intramedullary nail to the three-blade tip, the thread sparseness gradually changes to form a gradient thread. The universal intramedullary nail for percutaneous internal fixation of the pelvis disclosed by the utility model is widely used in percutaneous nail placement and internal fixation surgery. For example, in addition to using the universal intramedullary nail in conjunction with an extracorporeal guide frame for percutaneous internal fixation around the acetabulum to strengthen the intramedullary nail, and performing percutaneous nail placement and internal fixation surgery, it can be used as a cross-column nail and a posterior column nail, and the cross-column nail guide pin and the posterior column nail guide pin are respectively inserted into the pelvis. In addition, it can also be used to penetrate the pelvis other than the superior pubic ramus, including the inferior pubic ramus, ischium, ilium, sacroiliac joint and sacral vertebral body. When the universal intramedullary nail penetrates the inferior pubic ramus, it is used as a inferior pubic ramus nail, when it penetrates the ilium or sacral vertebral body, it is used as an iliac wing nail, and when it penetrates the sacroiliac joint, it is used as a sacroiliac joint nail, etc. The universal intramedullary nail for percutaneous internal fixation of the pelvis disclosed by the utility model is used in conjunction with an extracorporeal guide frame for percutaneous internal fixation around the acetabulum to strengthen the intramedullary nail, and percutaneous nailing internal fixation surgery for pelvic metastatic cancer is performed. This has the advantages of less trauma, fewer complications and lower cost, and can quickly and effectively relieve the patient's symptoms, allowing the patient to resume daily life as soon as possible, thereby continuing to connect with systemic treatment.

[0025] Example 1: A universal intramedullary nail for percutaneous fixation of the pelvis

[0026] Embodiment 1 of the present invention provides a universal intramedullary nail for percutaneous fixation of the pelvis, and its structure and connection relationship are described in detail below in conjunction with the accompanying drawings.

[0027] refer to Figure 1 The tip of the universal intramedullary nail 1 for pelvic percutaneous fixation is a three-edged tip 10;

[0028] A hollow channel 100 is provided inside the universal intramedullary nail 1 and the hollow channel 100 penetrates to both ends of the universal intramedullary nail 1 for inserting a guide needle, including a cross-column nail guide needle or a posterior column nail guide needle.

[0029] The outer wall of the universal intramedullary nail 1 is provided with threads, and the sparseness of the threads gradually changes from the nail tail 11 to the three-edged tip 10 of the universal intramedullary nail 1 to form a gradual thread.

[0030] In order to provide it with pulling force, the gradual thread is dense at the front and sparse at the back, the three-blade tip 10, the nail body of the intramedullary nail 1 and the nail tail 11 are integrated; and the nail tail 11 has a tight thread, so that the nail tail is fixed to the cortical bone. Figure 1 As shown; the three-edged tip 10 is a self-tapping nail tip, so that it can be tapped into the bone without tapping, such as Figure 3 shown.

[0031] As a specific implementation method for realizing the gradual thread density at the front and sparse at the back, continue to refer to Figure 1 The nail tail 11 of the universal intramedullary nail 1 is thick and has tight threads, which is used to be fixed on the cortical bone to enhance firmness; the threads in the area close to the tip of the universal intramedullary nail 1 are tight, while the threads in the area between the nail tail 11 and the front end of the universal intramedullary nail 1 are relatively sparse.

[0032] For easy tool control, refer to Figure 2 The end surface of the nail tail 11 of the universal intramedullary nail 1 is provided with a hexagonal hole for passing a hexagonal tool to tighten the nail tail 11 of the universal intramedullary nail 1 and fix the nail tail 11 of the universal intramedullary nail 1 to the cortical bone.

[0033] In order to enhance the bonding effect between the universal intramedullary nail 1 and the bone body, refer to Figure 4 and Figure 5 The thread of the universal intramedullary nail 1 is provided with a reverse hook groove 21, which is used to increase the holding force by increasing the contact area of ​​the bone body.

[0034] Furthermore, a bone cement outflow hole 22 is opened on the side wall of the front end of the universal intramedullary nail 1, and the bone cement outflow hole is connected to the hollow channel 100 of the universal intramedullary nail 1 for flowing out bone cement to fill the gap between the universal intramedullary nail 1 and the lesion area or cancellous bone between the universal intramedullary nail 1 and the cortical bone.

[0035] More specifically, different models are designed according to different lengths, and different models are designed according to different diameters, that is, there are intramedullary nails of different lengths and thicknesses.

[0036] Nearly 100 clinical applications have shown that the universal intramedullary nail for percutaneous internal fixation of the pelvis disclosed by the utility model, used in conjunction with an extracorporeal guide frame for percutaneous internal fixation of the acetabulum to strengthen the intramedullary nail, can be used to perform percutaneous nailing and internal fixation surgery for pelvic metastatic cancer, which can significantly improve patient symptoms, have extremely low complications, and allow patients to walk and move around a few hours after surgery, significantly reducing various medical expenses and shortening hospitalization time.

[0037] Furthermore, embodiment 1 of the utility model provides a universal intramedullary nail for percutaneous internal fixation of the pelvis, which can not only be used as a cross-column nail and a posterior column nail with the assistance of an extracorporeal guide frame for percutaneous internal fixation reinforcement of the intramedullary nail around the acetabulum, and the cross-column nail guide pin and the posterior column nail guide pin are respectively inserted into the pelvis, but can also be used as an intramedullary nail other than the anterior column nail used to penetrate the superior pubic ramus and part of the ilium, including a pubic ramus nail for penetrating the inferior pubic ramus, an iliac wing nail for penetrating the ilium or sacral vertebral body, a sacroiliac joint nail for penetrating the sacroiliac joint, etc. Figure 6 shown.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A universal intramedullary nail for percutaneous fixation of the pelvis, characterized in that: The tip of the universal intramedullary nail (1) is a three-edged tip (10); The universal intramedullary nail (1) is provided with a hollow channel (100) inside, and the hollow channel (100) penetrates to both ends of the universal intramedullary nail (1) and is used for inserting a guide needle; The outer wall of the universal intramedullary nail (1) is provided with a thread, and from the nail tail (11) of the universal intramedullary nail (1) to the three-edged tip (10), the thread sparseness gradually changes to form a gradual thread.

2. The universal intramedullary nail for percutaneous fixation of the pelvis according to claim 1, characterized in that: The gradual thread is dense at the front and sparse at the back; the three-blade tip (10), the nail body of the intramedullary nail (1) and the nail tail (11) are integrated; and the nail tail (11) has a tight thread, so that the nail tail (11) is fixed to the cortical bone; the three-blade tip (10) is a self-tapping nail tip, so that it can tap into the bone by itself.

3. The universal intramedullary nail for percutaneous fixation of the pelvis according to claim 2, characterized in that: The nail tail (11) of the universal intramedullary nail (1) is thick and has a tight thread, and is used to be fixed on the cortical bone to enhance firmness; The threads in the area close to the three-edged tip (10) of the universal intramedullary nail (1) are dense, while the threads in the area between the nail tail (11) and the three-edged tip (10) of the universal intramedullary nail (1) are relatively sparse.

4. The universal intramedullary nail for percutaneous internal fixation of the pelvis according to claim 3, characterized in that: The end surface of the nail tail (11) of the universal intramedullary nail (1) is provided with a hexagonal hole for inserting a hexagonal tool to tighten the nail tail (11) of the universal intramedullary nail (1) and fix the nail tail (11) of the universal intramedullary nail (1) on the cortical bone.

5. The universal intramedullary nail for percutaneous internal fixation of the pelvis according to claim 1, characterized in that: The thread of the universal intramedullary nail (1) is provided with a reverse hook groove (21) for increasing the holding force by increasing the contact area of ​​the bone body.

6. The universal intramedullary nail for percutaneous fixation of the pelvis according to claim 1, characterized in that: A bone cement outflow hole (22) is provided on the side wall of the front end of the universal intramedullary nail (1), and the bone cement outflow hole is connected to the hollow channel (100) of the universal intramedullary nail (1) and is used to flow out bone cement to fill the gap between the universal intramedullary nail (1) and the lesion area or cancellous bone between the universal intramedullary nail (1) and the cortical bone.

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