A spinal implant hydraulic elastic expansion internal fixation nail rod system

Abstract

The present invention belongs to the technical field of medical equipment and relates to a spinal implant hydraulic elastic expansion internal fixation nail rod system, which comprises a hydraulic extension rod (1), a water injection device (2) and a rod holding clamp (3), wherein the water injection device (2) is used to inject liquid into the hydraulic extension rod (1) so that the hydraulic extension rod (1) can be extended under the action of hydraulic pressure, thereby being able to adjust the length of the hydraulic extension rod (1), and the clamping clamp (3) is used to clamp the hydraulic extension rod (1) so as to facilitate matching the screw to the hydraulic extension rod (1). The liquid sac and the extension orthopedic rod are connected in series in a sleeve, and liquid is injected into the liquid sac through a small incision, so that the liquid sac is extended to push the extension orthopedic rod to move in translation. At the same time, there is a pressure relief valve at the bottom of the liquid sac to prevent the patient from suddenly bearing a high load and causing internal fixation failure.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical equipment, and relates to a spinal implant distraction internal fixation nail rod system, and in particular to a spinal implant hydraulic elastic distraction internal fixation nail rod system. Background Art

[0002] Early-onset scoliosis is scoliosis that develops before the age of 10 due to various causes. It significantly impacts the patient's appearance, cardiopulmonary function, and neurological development, severely impairing their quality of life and social function. Most cases require early surgical treatment.

[0003] Taking into account the growth and development of the child's spine, it is necessary to retain the growth potential of the spine while controlling or correcting scoliosis. Therefore, although the traditional growing rod technology commonly used in China has achieved certain results in treating this disease, this technology has obvious shortcomings, namely, it requires repeated distraction surgeries with a large incision range. Repeated surgeries have a great impact on the child's physical and mental health, and the resulting spontaneous fusion of the spine is relatively common, affecting the increase in spinal height. Foreign scholars have designed an elastic distraction system to treat early-onset scoliosis and have achieved certain results. However, due to design defects, the existing elastic distraction system has problems such as internal fixation breakage, metal debris, and protrusion of built-in objects.

[0004] Therefore, in view of the defects existing in the above-mentioned prior art, it is necessary to develop a new type of spinal implant distraction internal fixation nail rod system. Summary of the Invention

[0005] In order to overcome the defects of the existing technology, the present invention proposes a spinal implant hydraulic elastic expansion internal fixation nail rod system, which connects a liquid sac and an elongated orthopedic rod in series in a sleeve, and injects liquid into the liquid sac through a small incision, so that the liquid sac stretches and pushes the elongated orthopedic rod to move translationally. At the same time, there is a pressure relief valve at the bottom of the liquid sac to prevent the patient from suddenly being subjected to high loads and causing internal fixation failure.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A spinal implant hydraulic elastic distraction internal fixation nail rod system includes a hydraulic extension rod, a water injection device and a rod holding clamp. It is characterized in that the water injection device is used to inject liquid into the hydraulic extension rod so that the hydraulic extension rod can be extended under the action of hydraulic pressure, thereby being able to adjust the length of the hydraulic extension rod. The clamping clamp is used to clamp the hydraulic extension rod to facilitate matching the screw to the hydraulic extension rod.

[0008] Preferably, the hydraulic extension rod includes a sleeve, a liquid bag located in the sleeve, an open and closed ring mounted on the sleeve, and an extension orthopedic rod located in the end of the sleeve and with one end abutting against one end of the liquid bag. The sleeve is provided with a sleeve water injection port, through which liquid can be injected into the sleeve and into the liquid bag so that the liquid bag expands laterally to push the extension orthopedic rod to extend outward.

[0009] Preferably, the sleeve includes a sleeve body, an open-closed loop fitting portion is provided on the sleeve body, the sleeve water injection port is arranged in the open-closed loop fitting portion, a water injection transverse groove, a liquid sac accommodating groove connected to the water injection transverse groove and an elongated orthopedic rod accommodating groove connected to the liquid sac accommodating groove are provided inside the sleeve body, and the water injection transverse groove is communicated with the sleeve water injection port.

[0010] Preferably, the liquid sac comprises an elastic wavy liquid sac body and a pressure relief valve is provided at one end of the elastic wavy liquid sac body. The elastic wavy liquid sac body is arranged in the liquid sac holding tank and the end provided with the pressure relief valve is opposite to the water injection transverse groove.

[0011] Preferably, a developing ring is provided at the other end of the elastic wavy liquid bag body and the other end abuts against one end of the elongated correction rod.

[0012] Preferably, the open-closed ring includes an open-closed ring body and an open-closed ring water inlet is provided on the open-closed ring body, a limiting ball is provided at the end of the open-closed ring body and a limiting groove matching the limiting ball is provided on the sleeve body.

[0013] Preferably, one end of the elongated orthopedic rod is an elliptical rod and the other end is an orthopedic rod, and the elongated orthopedic rod receiving groove is also elliptical so that the elliptical rod can move in the elongated orthopedic rod receiving groove.

[0014] Preferably, a boss is provided at one end of the elliptical rod that is not connected to the orthopedic rod and abuts against the other end of the elastic wavy liquid sac body.

[0015] Preferably, the water injection device comprises a water injection sleeve, a water injection pipe is provided in the water injection sleeve, a water outlet is provided at the bottom of the water injection sleeve, and a water injection port and a pressure relief port are provided on the water injection pipe.

[0016] Preferably, the rod holding pliers include a gripping portion and a rod holding rod connected to the gripping portion, and two rod holding heads are provided at the end of the rod holding rod, and the two rod holding heads are used to clamp the hydraulic extension rod.

[0017] Compared with the prior art, the spinal implant hydraulic elastic expansion internal fixation nail rod system of the present invention has one or more of the following beneficial technical effects:

[0018] 1. The present invention adopts a hydraulic extension method, which only requires a small incision to inject liquid to achieve extension, making internal fixation implantation safer and saving patients from more pain.

[0019] 2. The elongated orthotic rod and sleeve of the present invention adopt a straight-arc design, which is similar to the curvature of the spine, so that the nail-rod system can better fit the surface of the spine.

[0020] 3. The elliptical matching design of the elongated orthotic rod and the sleeve of the present invention has anti-torsion performance, and the ellipse is relatively rounded, which can avoid irritation to tissues.

[0021] 4. The present invention adds a liquid bag between the elongated orthotic rods connected in series, which can increase the longitudinal growth force of the spine through the expansion force of the liquid bag and prevent the elongated orthotic rod and the sleeve from sliding and getting stuck.

[0022] 5. The wavy structure of the liquid capsule of the present invention can generate micro-motion to stimulate bone healing. The bottom pressure relief valve can release the liquid in the liquid capsule to the water injection horizontal groove when overloaded, providing overload protection.

[0023] 6. One end of the liquid capsule and the open and closed loops of the present invention both have X-ray imaging function, which facilitates the measurement of the liquid capsule elongation and the positioning of the open and closed loops, and facilitates the filling of liquid.

[0024] 7. In the present invention, the sliding contact surface and the telescopic liquid bag are both inside the sleeve, which can prevent metal debris generated by sliding from entering the human body. In addition, there is a boss at the tail end of the elongated orthopedic rod to prevent it from being pulled out of the sleeve, thereby improving safety.

[0025] 8. The double-head locking design of the rod holding pliers of the present invention is more stable, and the concave design of the head accurately matches the screw to avoid the rod from tilting when nailing, and the tail holding part saves more effort when turning the rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the spinal implant hydraulic elastic expansion internal fixation nail rod system of the present invention;

[0027] Figure 2 1 is a schematic structural diagram of a hydraulic elongation rod according to the present invention, wherein a portion is perspectively shown to illustrate the liquid sac inside the rod;

[0028] Figure 3 It is a structural schematic diagram of the sleeve of the hydraulic extension rod of the present invention;

[0029] Figure 4 is a schematic cross-sectional view of a sleeve of a hydraulic extension rod of the present invention;

[0030] Figure 5 Schematic diagram of the structure of the liquid capsule of the hydraulic extension rod of the present invention;

[0031] Figure 6This is a schematic structural diagram of the liquid capsule of the hydraulic extension rod of the present invention from another angle;

[0032] Figure 7 Schematic diagram of the structure of the open and closed loops of the hydraulic extension rod of the present invention;

[0033] Figure 8 Schematic diagram of the structure of the hydraulic elongation rod of the present invention;

[0034] Figure 9 It is a structural schematic diagram of the water injection device of the present invention;

[0035] Figure 10 It is a structural schematic diagram of the clamping pliers of the present invention. DETAILED DESCRIPTION

[0036] This patent is based on the research of the Xinjiang Uygur Autonomous Region Key R&D Task Special Project, Project No.: 2023B03020.

[0037] Before describing in detail any embodiment of the present invention, it should be understood that the present invention is not limited in its application to the construction and arrangement details of the components set forth in the following description or illustrated in the following figures. The present invention is capable of other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used herein are for descriptive purposes and should not be considered restrictive. The use of "including" or "having" and their variations herein is intended to cover the items and their equivalents set forth below and additional items. Unless otherwise specified or limited, the terms "mounted", "connected", "supported" and "coupled" and their variations are used broadly and cover direct mounting and indirect mounting, connection, support and coupling. In addition, "connected" and "coupled" are not limited to physical or mechanical connections or couplings.

[0038] Furthermore, on the first hand, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second hand, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.

[0039] Figure 1The schematic diagram of the spinal implant hydraulic elastic expansion internal fixation nail rod system of the present invention is shown. Figure 1 As shown, the spinal implant hydraulic elastic expansion internal fixation nail rod system of the present invention includes a hydraulic extension rod 1, a water injection device 2 and a rod holding forceps 3.

[0040] During use, the hydraulic extension rod 1 is implanted in the human body and secured with a mating screw. The water injection device 2 is used to inject liquid into the hydraulic extension rod 1, allowing it to extend under the action of the hydraulic pressure, thereby adjusting its length. Thus, the present invention utilizes a hydraulic extension method that requires only a small incision to inject liquid, making internal fixation implantation safer and less painful for the patient. The clamping forceps 3 are used to clamp the hydraulic extension rod 1 to facilitate the mating of screws onto it.

[0041] like Figure 2 As shown, in the present invention, the hydraulic extension rod 1 includes a sleeve 11, a liquid bag 12 located in the sleeve 11, an open and closed ring 13 sleeved on the sleeve 11, and an extension orthopedic rod 14 located in the end of the sleeve 11 and one end of which is against one end of the liquid bag 12.

[0042] Preferably, the sleeve 11 is provided with two fluid sacs 12 and two elongation rods 14. This allows the hydraulic elongation rod 1 to extend in both directions, achieving a better elongation effect. Furthermore, the placement of the fluid sacs 12 between the elongation rods 14 in series increases the longitudinal growth force of the spine through the expansion force of the fluid sacs 12, preventing the elongation rods 14 from sliding and jamming with the sleeve 11.

[0043] like Figure 3 and 4 As shown, the sleeve 11 is provided with a sleeve water injection port 113. Liquid can be injected into the sleeve 11 through the sleeve water injection port 113 and enter the liquid bag 12, so that the liquid bag 12 expands laterally to push the elongated orthotic rod 14 to extend outward.

[0044] The sleeve 11 includes a sleeve body 111 . The sleeve body 111 is provided with an open-closed loop fitting portion 112 . The open-closed loop 13 is provided on the open-closed loop fitting portion 112 . The sleeve water injection port 113 is provided in the open-closed loop fitting portion 112 .

[0045] The sleeve body 111 is provided with a water injection groove 114, a liquid sac receiving groove 115 connected to the water injection groove 114, and an elongated orthopedic rod receiving groove 116 connected to the liquid sac receiving groove 115. The water injection groove 114 is communicated with the sleeve water injection port 113.

[0046] The liquid sac 12 is disposed in the liquid sac holding groove 115. The elongated orthopedic rod 14 is disposed in the elongated orthopedic rod holding groove 116, with one end of the elongated orthopedic rod 14 abutting against one end of the liquid sac 12. Thus, liquid is injected into the water injection groove 114 through the sleeve water injection port 113 and then enters the liquid sac 12 through the water injection groove 114. The liquid entering the liquid sac 12 causes the liquid sac 12 to expand laterally, thereby pushing the elongated orthopedic rod 14 outward.

[0047] like Figure 5 and 6 As shown, the liquid sac 12 includes an elastic, wavy-shaped liquid sac body 121, one end of which is provided with a pressure relief valve 123. The elastic, wavy-shaped liquid sac body 121 is disposed within the liquid sac holding tank 115, with the end provided with the pressure relief valve 123 facing the water injection groove 114. Thus, liquid in the water injection groove 114 can enter the liquid sac 12 through the pressure relief valve 123.

[0048] In the present invention, the elastic, wavy sac body 121 is made of an elastic material. Due to the constraints imposed by the inner wall of the sleeve body 111, water inflow through the pressure relief valve 123 ensures that the diameter of the elastic, wavy sac body 121 remains constant, allowing only lateral expansion. Simultaneously, its wavy structure provides a certain elastic force, generating micro-motion within the overall structure. Furthermore, if impact loads are encountered, the pressure relief valve 123 (similar in design to the mouth of a shrieking beverage bottle) allows the liquid within the sac 12 to leak into the water inlet groove 114, thereby relieving pressure and protecting the patient.

[0049] In the present invention, a developing ring 122 is provided at the other end of the elastic, wavy sac body 121, which abuts against one end of the elongated orthopedic rod 14. The developing ring 122 provides an X-ray imaging function, facilitating measurement of the elongation of the sac 12, thereby quantifying the elongation distance during surgery.

[0050] like Figure 7 As shown, the open-closed ring 13 includes an open-closed ring body 131, which is provided with an open-closed ring water inlet 132. During use, if liquid needs to be injected to extend the elongated orthopedic rod 14, the open-closed ring 13 is rotated so that the open-closed ring water inlet 132 is aligned with the sleeve water inlet 113, thereby injecting liquid. After liquid injection is completed, the open-closed ring 13 is rotated again so that the open-closed ring water inlet 132 is offset from the sleeve water inlet 113, thereby sealing the sleeve water inlet 113 through the open-closed ring 13.

[0051] Preferably, a stop ball 133 is provided at the end of the open-closed loop body 131, and a stop groove 117 is provided on the sleeve body 111 to cooperate with the stop ball 133. Thus, the cooperation between the stop ball 133 and the stop groove 117 facilitates the determination of whether the open-closed loop water inlet 132 is aligned with the sleeve water inlet 113.

[0052] More preferably, the open-closed ring body 131 has a development function under X-rays, thereby facilitating the positioning of the open-closed ring 13 and thus facilitating the filling of liquid.

[0053] like Figure 8 As shown, the elongated orthopedic rod 14 comprises an elliptical rod 141 at one end and an orthopedic rod 142 at the other. The orthopedic rod 142 is located outside the sleeve 11 and is used for screw connection. The elongated orthopedic rod receiving slot 116 is also elliptical, allowing the elliptical rod 141 to move within it. The elliptical design of the elliptical rod 141 and the sleeve 11 provides torsion resistance, and the relatively rounded shape of the elliptical rod prevents tissue irritation.

[0054] Although not shown in the figure, preferably, the end of the elliptical rod 141 not connected to the orthopedic rod 14 is provided with a boss and abuts against the other end of the elastic wavy sac body 121. Thus, the boss prevents the elongated orthopedic rod 14 from being pulled out of the sleeve 11, improving safety.

[0055] In the present invention, all sliding contact surfaces and the liquid capsule are inside the sleeve, which can prevent metal debris generated by sliding from entering the human body and improve safety.

[0056] In addition, in the present invention, the sleeve 11 and the elongated orthotic rod 14 are both designed to mimic the curvature of the human body, that is, a straight-arc design that is similar to the curvature of the spine, so that the nail-rod system can better fit the surface of the spine.

[0057] Figure 9 The structural diagram of the water injection device of the present invention is shown in FIG. Figure 9 As shown, the water injection device 2 includes a water injection sleeve 21. A water injection pipe 22 is provided in the water injection sleeve 21, and a water outlet 25 is provided at the bottom of the water injection sleeve 21. A water injection port 23 and a pressure relief port 24 are provided on the water injection pipe 22.

[0058] During use, if liquid needs to be injected to extend the elongated orthopedic rod 14, the open-closed ring 13 is rotated so that the open-closed ring water inlet 132 aligns with the sleeve water inlet 113. The water outlet 25 of the water injection sleeve 21 is inserted between the open-closed ring water inlet 132 and the sleeve water inlet 113. The water injection sleeve 21 is made of medical silicone material and is elastic, facilitating insertion. Once inserted, the water injection pipe 22 is inserted into the water injection sleeve 21. The water injection sleeve 21 opens its skirt, providing a seal during water injection. An appropriate amount of liquid is injected, causing the liquid sac 12 to expand and extend. After the liquid is injected, the pressure relief port 24 is opened and the pressure relief conduit is inserted into the water injection groove 114 through the pressure relief port 24 (the pressure relief conduit allows atmospheric pressure to exist in the water injection groove 114), and the residual liquid in the water injection groove 114 is extracted through the water injection port 23, thereby leaving space for the liquid bag 12 to release pressure.

[0059] Figure 10 FIG. 1 shows a schematic structural diagram of the clamping pliers of the present invention. Figure 10 As shown, the rod holding forceps 3 include a gripping portion 31 and a rod holding rod 32 connected to the gripping portion 31. Two rod holding heads 33 are provided at the end of the rod holding rod 32. The two rod holding heads 33 are used to clamp the elongated orthopedic rod 14 so as to facilitate fixing the elongated orthopedic rod 14 to the nut of the screw. As a result, the double-headed locking design of the rod holding forceps 3 is more stable. At the same time, the head of the rod holding forceps 3 adopts a concave design, which can accurately match the screw and prevent the rod from tilting when the screw is tightened. Moreover, the tail gripping part saves more effort when turning the rod.

[0060] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may, based on the principles of the present invention, modify or replace the technical solutions of the present invention with equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A spinal implant hydraulic elastic expansion internal fixation nail rod system, comprising a hydraulic extension rod (1), a water injection device (2) and a rod holding forceps (3), characterized in that: The water injection device (2) is used to inject liquid into the hydraulic extension rod (1) so that the hydraulic extension rod (1) can be extended under the action of hydraulic pressure, thereby adjusting the length of the hydraulic extension rod (1); the clamping pliers (3) are used to clamp the hydraulic extension rod (1) so as to facilitate matching the screw to the hydraulic extension rod (1); The hydraulic elongation rod (1) comprises a sleeve (11), a liquid bag (12) located in the sleeve (11), an open and closed ring (13) sleeved on the sleeve (11), and an elongation orthopedic rod (14) located in the end of the sleeve (11) and having one end abutting against one end of the liquid bag (12); The liquid capsule (12) comprises an elastic wavy liquid capsule body (121), one end of the elastic wavy liquid capsule body (121) is provided with a pressure relief valve (123), the other end of the elastic wavy liquid capsule body (121) is provided with a developing ring (122), and the other end is in contact with one end of the elongated orthopedic rod; the elastic wavy liquid capsule body (121) is made of elastic material, and the developing ring (122) has a developing function under X-rays; the pressure relief valve (123) is opposite to the water injection groove (114) of the sleeve (11), and the liquid in the water injection groove can enter the liquid capsule through the pressure relief valve; The open-closed ring (13) includes an open-closed ring body (131) and an open-closed ring water inlet (132) is provided on the open-closed ring body. When in use, the open-closed ring is rotated so that the open-closed ring water inlet is aligned with the sleeve water inlet of the sleeve, thereby realizing the liquid injection operation. After the liquid injection is completed, the open-closed ring is rotated again so that the open-closed ring water inlet is staggered with the sleeve water inlet, so that the sleeve water inlet is closed by the open-closed ring.

2. The spinal implant hydraulic elastic expansion internal fixation nail rod system according to claim 1, characterized in that: The sleeve (11) is provided with a sleeve water injection port (113), through which liquid can be injected into the sleeve (11) and into the liquid bag (12), thereby causing the liquid bag (12) to expand laterally to push the elongated orthopedic rod (14) to extend outward.

3. The spinal implant hydraulic elastic expansion internal fixation nail rod system according to claim 2, characterized in that: The sleeve (11) includes a sleeve body (111), an open-closed loop fitting portion (112) is provided on the sleeve body (111), and the sleeve water injection port (113) is arranged in the open-closed loop fitting portion (112). The sleeve body (111) is internally provided with a water injection transverse groove (114), a liquid sac accommodating groove (115) connected to the water injection transverse groove (114), and an elongated orthopedic rod accommodating groove (116) connected to the liquid sac accommodating groove (115), and the water injection transverse groove (114) is communicated with the sleeve water injection port (113).

4. The spinal implant hydraulic elastic expansion internal fixation nail rod system according to claim 3, characterized in that: The elastic wavy liquid sac body (121) is arranged in the liquid sac containing groove (115) and one end provided with the pressure relief valve (123) is opposite to the water injection horizontal groove (114).

5. The spinal implant hydraulic elastic expansion internal fixation nail rod system according to claim 4, characterized in that: A limiting ball (133) is provided at the end of the open-closed ring body (131), and a limiting groove (117) matching the limiting ball (133) is provided on the sleeve body (111).

6. The spinal implant hydraulic elastic expansion internal fixation nail rod system according to claim 5, characterized in that: One end of the elongated orthopedic rod (14) is an elliptical rod (141), and the other end is an orthopedic rod (142). The elongated orthopedic rod receiving groove (116) is also elliptical so that the elliptical rod (141) can move in the elongated orthopedic rod receiving groove (116).

7. The spinal implant hydraulic elastic expansion internal fixation nail rod system according to claim 6, characterized in that: One end of the elliptical rod (141) not connected to the orthopedic rod (142) is provided with a boss and abuts against the other end of the elastic wavy liquid sac body (121).

8. The spinal implant hydraulic elastic expansion internal fixation nail rod system according to any one of claims 1 to 7, characterized in that: The water injection device (2) comprises a water injection sleeve (21), a water injection pipe (22) is provided in the water injection sleeve (21), a water outlet (25) is provided at the bottom of the water injection sleeve (21), and a water injection port (23) and a pressure relief port (24) are provided on the water injection pipe (22).

9. The spinal implant hydraulic elastic expansion internal fixation nail rod system according to claim 8, characterized in that: The rod holding pliers (3) comprise a gripping portion (31) and a rod holding rod (32) connected to the gripping portion (31); two rod holding heads (33) are provided at the end of the rod holding rod (32); and the two rod holding heads (33) are used to clamp the hydraulic extension rod (1).

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