CN106510818A - Component structure for improving percutaneous sealing effect of orthopedic external fixation frame - Google Patents

Abstract

The invention discloses a component structure for improving the percutaneous sealing effect of an orthopedic external fixator. There are several grooves with hydroxyapatite coating or growth factor coating on the umbrella-shaped part, which can improve the holding strength of the external fixator in the bone canal and the sealing effect of the percutaneous part, thereby reducing needle tract infection risk, and improve the prognosis and functional recovery of patients after treatment with external fixators.

Description

A component structure for improving percutaneous sealing effect of orthopedic external fixator

technical field

The invention belongs to the field of medical equipment and supplies, and in particular relates to a component structure and a use method for improving the percutaneous sealing effect of an orthopedic external fixator.

Background technique

In orthopedic clinical work, external fixator is a commonly used fixation device, which is widely used in the treatment of fractures, bone defects, osteomyelitis and bone deformities. According to the needs of fracture healing time, external fixator needs to be fixed on the limbs Therefore, the mechanical stability of the external fixator and the biocompatibility of the internal implant site (usually a threaded or non-threaded screw rod) are the main factors that determine whether it can be worn for a long time. One end of the implanted nail rod of the external fixator is fixed on the bone, and the other end communicates with the outside body through the skin. Since the percutaneous part cannot form close contact or seal with the skin soft tissue, external bacteria enter through the gap between the skin and the nail rod. Infection of the screw tract or even bone tissue in the body leads to failure of external fixation, which seriously affects the prognosis and functional recovery of the patient. Therefore, improving the bio-sealing effect between the percutaneous part of the external fixator and the skin tissue is the best way to reduce the occurrence of screw tract infection. effective means.

Contents of the invention

The purpose of the present invention is to provide a component structure that improves the percutaneous sealing effect of the orthopedic external fixator, so as to improve the holding strength of the external fixator in the bone canal and the sealing effect of the percutaneous part, thereby reducing the risk of needle tract infection and improving patient safety. Prognosis and functional recovery after treatment with external fixators.

In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a component structure for improving the percutaneous sealing effect of orthopedic external fixator, including a nail rod, two ends of the nail rod are respectively provided with self-tapping threads and clamping parts, and the nail rod The middle section is provided with a nut, and the nut includes an umbrella-shaped part, and several grooves provided with hydroxyapatite coating or growth factor coating are opened on the umbrella-shaped part.

The nail bar includes a rod and self-tapping threads and clamping parts respectively arranged at both ends of the rod, the nut includes a threaded barrel and a tail and an umbrella-shaped part arranged at both ends of the threaded barrel, and the nut is arranged along its axis. There are threaded holes matched with nail rods.

The stem of the nail rod is a smooth cylindrical structure, the threaded barrel of the nut is a smooth cylindrical structure, and the tail is an elliptical cylindrical structure.

The outer surfaces of the rod and the threaded cylinder are provided with nano-silver ions or graphene or an antibiotic coating that can inhibit bacterial growth.

The tail of the nut is exposed outside the skin and does not cover the clamping portion at the tail of the nail rod.

The diameter of the threaded barrel of the nut is 1.5mm larger than the outer diameter of the self-tapping thread of the nail rod.

The nail rod and the nut are integrally designed, and the nail rod and the nut above the umbrella are all cylindrical structures with smooth surfaces. The outer surface of the cylindrical structure is provided with nano-silver ions or graphene or antibiotic coatings that can inhibit bacterial growth. Floor.

The groove is longitudinally opened on the umbrella-shaped part, and the tip of the umbrella-shaped part faces the clamping part.

The clamping part is designed as a non-complete cylindrical structure, and the clamping part has two parallel planes for easy clamping.

The length of the clamping part of the nail bar is 2 cm, the cross-sectional diameter of the self-tapping thread is 2-5 mm, and the diameter of the widest part of the umbrella-shaped part is 3-5 mm thicker than that of the nail bar.

Compared with the prior art, the present invention has at least the following beneficial effects. In the application process of orthopedic external fixator, needle tract infection is the most important complication, and the contact part between the skin and the nail rod is the most common site of needle tract infection , and the subcutaneous cavity is an important factor for needle tract infection. The present invention rationally designs the nut and the nail rod. The surface of the umbrella has longitudinal grooves and a hydroxyapatite coating or a growth factor coating. It is conducive to the crawling and growth of cells, prevents the formation of gaps, greatly improves the sealing effect, and reduces the probability of infection as much as possible. At the same time, the umbrella-shaped part cooperates with the nail rod. Pressing together further improves the mechanical stability of the nail rod, and the umbrella-shaped part and the nail rod together increase the holding force on the backbone.

Further, the tail end of the nail rod is a clamping part, and the cylindrical tail end of the nut can be an elliptical column structure, which is convenient for fixing by a T-shaped handle or an electric drill for related operations.

Furthermore, the threaded portion at the head end of the nail rod has various lengths, and an appropriate length can be selected according to the lengths required by the pelvis, limbs, etc., so as to ensure that the parts driven into the bone are all threaded, increasing the half-pointed bone holding strength.

Further, the cross-sectional diameter of the self-tapping thread is 2-5mm, and a nail rod with a suitable diameter can be selected according to the needs of different parts of the bone and conditions and the fixing strength.

Further, the cylindrical outer surface of the screw cap has a smooth structure and is provided with nano-silver ions or graphene or an antibiotic coating, which can effectively inhibit the growth of bacteria at the contact part with the epidermis.

Further, the stem of the nail rod has various lengths, and an appropriate length can be selected according to the thickness of the soft tissue at the fixation site to ensure that the tail end is exposed outside the skin.

Further, the nut has various lengths, and an appropriate length can be selected according to the thickness of the soft tissue at the fixation site to ensure that its tail end is exposed outside the skin and does not cover the clamping part of the tail end of the nail rod, so as to prevent the installation of the needle clip from being hindered.

Description of drawings

Fig. 1 is the front view of nail bar in embodiment 1.

Fig. 2 is a bottom view of Fig. 1 .

Fig. 3 is a left side view of Fig. 2 .

4 is a front view of the nut structure in Embodiment 1.

FIG. 5 is a top view of FIG. 4 .

Fig. 6 is a left side view of Fig. 4 .

Fig. 7 is a schematic diagram of the use state of the assembled structure of the present invention.

Figure 8 is a front view of Embodiment 2.

Fig. 9 is a bottom view of Fig. 8 .

Fig. 10 is a left view of Fig. 9 .

Fig. 11 is a schematic diagram of the use state of the integrated structure of the present invention.

In the accompanying drawings: 1, nail rod, 11, self-tapping thread, 12, clamping part, 13, rod part, 2, nut, 21, umbrella-shaped part, 22, groove, 23, thread cylinder, 24, tail , 25, threaded holes.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Fig. 1-Fig. 7, the present invention comprises nail bar 1, and nail bar 1 comprises bar 13 and is respectively arranged on the self-tapping thread 11 of bar 13 two ends and clamping part 12, and the bar 13 of nail bar 1 is The cylindrical structure with smooth surface, the clamping part 12 is designed as a non-complete cylindrical structure, and the clamping part has two parallel planes for easy clamping; the middle section of the nail bar 1 is provided with a nut 2, and the nut 2 is provided with a nail along its axial direction. The threaded hole 25 fitted with the rod 1, the nut 2 includes an umbrella-shaped part 21 and a threaded barrel 23, the umbrella-shaped part 21 is longitudinally provided with a number of grooves 22 provided with hydroxyapatite coating or growth factor coating, the umbrella-shaped The tip of part 21 faces clamping part 12, and tail part 24 and umbrella-like part 21 are arranged at two ends of threaded barrel 23, and threaded barrel 23 of nut 2 is a cylindrical structure with smooth surface, and tail part 24 is an elliptical cylindrical structure, and rod part 13 and The outer surface of the threaded barrel 23 is provided with nano-silver ions or graphene or an antibiotic coating that can inhibit the growth of bacteria. The diameter of the barrel 23 is 1.5 mm larger than the outer diameter of the self-tapping thread 11 of the nail bar 1, the length of the clamping part 12 of the nail bar 1 is 2 cm, the cross-sectional diameter of the self-tapping thread 11 is 2 to 5 mm, and the widest part of the umbrella-shaped part 21 The diameter is 3 to 5mm thicker than the nail bar 1.

As shown in Figure 7, during use, select the appropriate length of the nail rod 1 according to the length of the fixation site that needs to be screwed into the bone to ensure that the contact parts of the nail rod 1 and the bone are threaded to increase its holding force on the bone. The length of the exposed part is to facilitate the fixing of the tube needle clamp and the connecting rod; the insertion method of the nail rod 1 is the same as that of the steel needle of the conventional external fixator, and can be screwed in with an electric drill or a T-shaped handle. The barrel protects the soft tissue and prevents the thread from causing damage to the soft tissue. After the screw rod 1 is placed, select the nut 2 of an appropriate length, and tighten the umbrella-shaped expanded end of the umbrella-shaped part from the tail end of the screw rod 1 to the bone surface inwardly. The nut 2 The length is determined by the tail end of the cylindrical threaded barrel 23 with a smooth outer surface exposed outside the skin and not reaching the tail end of the nail rod 1 after tightening. After completing these two steps, the needle clamp and the connecting rod can be connected to complete the external fixation .

Example 2

As shown in Figures 8-11, the nail bar 1 and the nut 2 are designed integrally, the tip of the umbrella-shaped part 21 faces the clamping part 12, and the nail bar 1 and the nut 2 above the umbrella-shaped part 21 are all smooth. A cylindrical structure, the outer surface of the cylindrical structure is provided with nano-silver ions or graphene or an antibiotic coating that can inhibit the growth of bacteria.

During use, according to the length of the fixation site to be screwed into the bone, select the appropriate length of the nail rod 1 to ensure that the contact parts of the nail rod 1 and the bone are threaded, and its umbrella-shaped part 21 is completely embedded in the skin, and its threaded barrel 23 ends The end is exposed outside the skin. After this operation, the tube needle clamp and the connecting rod can be connected to complete the external fixation.

During the application of orthopedic external fixator, needle tract infection is the most important complication. Among them, the contact site between the skin and the nail rod 1 is the most common site of needle tract infection, and the subcutaneous cavity is an important factor for needle tract infection. The umbrella-shaped part of the invention design has longitudinal grooves on the umbrella-shaped surface and has a coating of hydroxyapatite or growth factor, which is conducive to the crawling growth of cells, preventing the formation of gaps, and reducing the probability of infection; the cylinder with the exposed screw cap The surface is smooth and coated with nano-silver ions or graphene or antibiotics, which can inhibit the growth of bacteria to further reduce the probability of infection.

Claims (10)

1. A component structure for improving the percutaneous sealing effect of an orthopedic external fixator, characterized in that it comprises a nail rod (1), and the two ends of the nail rod (1) are respectively provided with self-tapping threads (11) and clamping parts (12 ), the middle section of the nail rod (1) is provided with a nut (2), and the nut (2) includes an umbrella (21), and the umbrella (21) is provided with several hydroxyapatite coatings or growth factor Coated grooves (22). 2. A component structure for improving the percutaneous sealing effect of orthopedic external fixator according to claim 1, characterized in that, the nail rod (1) comprises a rod (13) and is respectively arranged on the rod (13) Self-tapping threads (11) and clamping parts (12) at both ends, the nut (2) includes a threaded barrel (23) and tails (24) and umbrella-shaped parts (21) arranged at both ends of the threaded barrel (23) , the nut (2) is provided with a threaded hole (25) matched with the nail bar (1) along its axial direction. 3. a kind of assembly structure that improves percutaneous sealing effect of orthopedic external fixator according to claim 2, is characterized in that, the rod portion (13) of described nail rod (1) is the cylindrical structure with smooth surface; The threaded barrel (23) of the nut (2) is a smooth cylindrical structure, and the tail (24) is an elliptical cylindrical structure. 4. A component structure for improving the percutaneous sealing effect of an orthopedic external fixator according to claim 2 or 3, characterized in that, the outer surface of the rod (13) and the threaded cylinder (23) is provided with a restraint Nanosilver ions or graphene or antimicrobial coatings for bacterial growth. 5. A component structure for improving the percutaneous sealing effect of an orthopedic external fixator according to any one of claims 2-4, characterized in that the tail of the nut (2) is exposed outside the skin and does not cover the nail rod (1) The clamping part (12) at the tail end. 6. A component structure for improving the percutaneous sealing effect of an orthopedic external fixator according to claim 2-4, characterized in that the diameter of the threaded barrel (23) of the nut (2) is smaller than that of the screw rod (1) The self-tapping thread (11) outer diameter of the big 1.5mm. 7. A component structure for improving the percutaneous sealing effect of an orthopedic external fixator according to claim 1, characterized in that, the nail rod (1) and the nut (2) are integrally designed, and the umbrella-shaped part (21 ) above the nail bar (1) and the nut (2) are cylindrical structures with smooth surfaces, and the outer surface of the cylindrical structures is provided with nano-silver ions or graphene or antibiotic coatings that can inhibit bacterial growth. 8. A component structure for improving the percutaneous sealing effect of orthopedic external fixator according to claim 1, characterized in that, the groove (22) is longitudinally set on the umbrella-shaped part (21), and the umbrella-shaped part ( 21) with the tip facing the clamping part (12). 9. A kind of assembly structure improving the percutaneous sealing effect of orthopedic external fixator according to claim 1, characterized in that, the clamping part (12) is designed as a non-complete cylindrical structure, and the clamping part (12) has Two parallel planes for easy clamping. 10. a kind of assembly structure that improves percutaneous sealing effect of orthopedic external fixator according to claim 1, is characterized in that, the length of described nail rod (1) clamping portion (12) is 2cm, self-tapping thread ( 11) The cross-sectional diameter is 2-5mm, and the diameter of the widest part of the umbrella-shaped part (21) is 3-5mm thicker than that of the nail rod (1).