Screw implantation device

Abstract

A screw implantation device includes a driving motor, a central shaft, a transmission assembly, a guide pin assembly, a speed reducer assembly and a pedicle screw assembly. The central shaft is dynamically coupled to the drive motor. The transmission assembly includes a hollow transmission shaft, which is sleeved around the central shaft and coaxially arranged with the central shaft. The hollow transmission shaft is dynamically coupled to the driving motor. The hollow transmission shaft has a first end and a second end. The driving motor is arranged at the second end. The guide needle assembly is detachably assembled on the first end of the hollow transmission shaft. The speed reducer assembly is arranged at the second end of the hollow transmission shaft. The speed reducer assembly is used for connecting the driving motor and the hollow transmission shaft. The pedicle screw assembly includes a hollow pedicle screw. The pedicle screw assembly is detachably assembled to the first end of the hollow transmission shaft and connected to the guide pin assembly.

Description

nailing device This invention relates to an implantation device, and more particularly to an implantation device that simplifies the process of implanting pedicle screws. Pedicle fixation surgery is a common procedure for treating lower back pain. It involves making a tiny incision in the skin, drilling a guide hole in the bone using instruments such as a trocar or bone drill, inserting a guide wire, and then securing a hollow pedicle screw to the spine along the guide wire to complete the pedicle screw implantation and fixation. However, generally speaking, drilling requires high speed and low torque, while pedicle screw insertion requires high torque and low speed, so the required instruments are different. In other words, the conventional pedicle screw implantation method requires a rather complicated surgical procedure and instrument changes. Not only is it easy for the surgeon to miss a step, but frequent changes in surgical instruments can also lead to positional deviations (i.e., poor drilling accuracy), resulting in a difference between the final implantation position and the preoperative planned position. Therefore, how to overcome the above-mentioned defects through structural design improvements has become one of the important issues that this project aims to address. This invention mainly provides a staple implantation device to simplify the staple implantation process and solve the problems of cumbersome staple implantation procedures and excessive instruments required in conventional techniques. To address the aforementioned technical problems, one technical solution adopted by this invention is to provide a pedicle screw implantation device, comprising a drive motor, a central shaft, a transmission assembly, a guide pin assembly, a reducer assembly, and a pedicle screw assembly. The central shaft is powered by the drive motor. The transmission assembly includes a hollow transmission shaft, which is sleeved around the central shaft and coaxially configured with it. The hollow transmission shaft is powered by the drive motor and has a first end and a second end. The drive motor is located at the second end. The guide pin assembly is detachably assembled to the first end of the hollow transmission shaft. The guide pin assembly includes a sleeve, a connector, and a guide pin. The sleeve is connected to the central shaft. The connector is hollow and detachably connected to the sleeve. The guide pin passes through the connector and is connected to the sleeve. The hollow transmission shaft is sleeved around the sleeve and connects to the connector. The reducer assembly is located at the second end of the hollow transmission shaft and is used to connect the drive motor and the hollow transmission shaft. The pedicle screw assembly includes a hollow pedicle screw, which is detachably assembled to the first end of the hollow drive shaft and connected to the guide pin assembly. One of the beneficial effects of the present invention is that the nail-planting device provided by the present invention can be powered by a drive motor through a hollow drive shaft, and the guide pin assembly and the drive motor are respectively disposed at both ends of the hollow drive shaft, thereby shortening the length of the guide pin to avoid bending or deformation due to external force, and thus improving the drilling positioning accuracy of the guide pin. To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. The following specific embodiments illustrate the implementation of the "peg implantation device" disclosed in this invention. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. Furthermore, the accompanying drawings of this invention are for simple illustrative purposes only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this invention in detail, but the disclosed content is not intended to limit the scope of protection of this invention. In addition, it should be understood that although terms such as "first," "second," and "third" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are mainly used to distinguish one element from another. Furthermore, the term "or" as used herein may, depending on the actual situation, include any combination of one or more of the associated listed items. [Example] Referring to Figures 1 and 2, Figure 1 is a schematic diagram of the implantation device of the present invention, and Figure 2 is an exploded schematic diagram of the implantation device of the present invention. The present invention provides an implantation device D, which includes: a drive motor 1, a central shaft 2, a transmission assembly 3, a guide pin assembly 4, a reducer assembly 5, and a pedicle screw assembly 6. The central shaft 2 and the reducer assembly 5 are poweredly connected to the drive motor 1. The drive motor 1 outputs power to drive the central shaft 2 to rotate along a first rotation direction R1. The reducer assembly 5 includes a reducer 51 and an output shaft 52 connected to the reducer 51. The reducer 51 is connected to the drive motor 1. The reducer assembly 5 connects the drive motor 1 and the transmission assembly 3. Referring to Figure 3, which is a schematic diagram of the transmission assembly of the nail-planting device of the present invention, the transmission assembly 3 includes a hollow transmission shaft 31 and a hollow connecting shaft 32, with the hollow connecting shaft 32 sleeved around the hollow transmission shaft 31. The hollow transmission shaft 31 has a first end 311 and a second end 312. A fastener 33 is provided at the second end 312 of the hollow transmission shaft 31, while a plurality of limiting members 34 are provided at its first end 311. Furthermore, the outer wall of the hollow connecting shaft 32 has an external thread 321 located near the first end 311. Referring to Figures 4 and 5, Figure 4 is a schematic diagram of the guide pin assembly of the implantation device of the present invention, and Figure 5 is a cross-sectional schematic diagram of the VV section of Figure 4. The guide pin assembly 4 includes a sleeve 41, a connector 42, and a guide pin 43. The connector 42 is hollow, and each side of the connector 42 has two protrusions 421. The connector 42 is detachably connected to the sleeve 41. The guide pin 43 passes through the connector 42 and is connected to the sleeve 41. In addition, the sleeve 41 has a shaft hole 410, which is located on the opposite side of the connector 42. The inner wall of the sleeve 41 has an internal thread 411, and the surface of the guide pin 43 has an external thread 431. The sleeve 41 and the guide pin 43 are connected to each other by the engagement of the internal thread 411 and the external thread 431. Referring to Figure 6, Figure 6 is a schematic diagram of the pedicle screw assembly of the implantation device of the present invention. The pedicle screw assembly 6 includes a hollow pedicle screw 61 and a U-shaped connector 62. The U-shaped connector 62 has a through hole 620 through which the hollow pedicle screw 61 passes and is engaged with the U-shaped connector 62. However, it should be noted that the rotation of the hollow pedicle screw 61 is not restricted by the U-shaped connector 62. In addition, the inner wall of the U-shaped connector 62 has internal threads 621. Referring to Figures 2 and 7, Figure 7 is a schematic diagram of the guide pin assembly of the implantation device of the present invention assembled with the transmission assembly. A hollow transmission shaft 31 is sleeved around the central shaft 2, with the drive motor 1 positioned at the second end 312 of the hollow transmission shaft 31. The hollow transmission shaft 31 is connected to the output shaft 52 of the reducer assembly 5 via fasteners 33. In other words, the reducer assembly 5 connects the drive motor 1 and the hollow transmission shaft 31 (the reducer 51 is connected to the drive motor 1, and the output shaft 52 is connected to the hollow transmission shaft 31). Thus, the hollow transmission shaft 31 is coaxially configured with the central shaft 2, and the hollow transmission shaft 31 is powered by the drive motor 1. Furthermore, the guide pin assembly 4 can be directly and detachably assembled to the first end 311 of the hollow transmission shaft 31, that is, directly installed at the front end of the implantation device D. The hollow transmission shaft 31 is sleeved around the sleeve member 41 and connected to the connecting member 42. Further, each protrusion 421 of the connecting member 42 is engaged between two limiting members 34. Referring to Figures 2 and 8, Figure 8 is a schematic diagram of the retaining member of the implantation device of the present invention assembled with the transmission assembly. The implantation device D also includes a retaining member 7, which is sleeved around the transmission assembly 3. Next, referring to Figures 9 and 10, Figure 9 is a schematic diagram of the pedicle screw assembly of the implantation device of the present invention assembled with the transmission assembly and the retaining member, and Figure 10 is a partially enlarged cross-sectional schematic diagram of the implantation device of the present invention. The pedicle screw assembly 6 is connected to the guide needle assembly 4 and is assembled together with the guide needle assembly 4 at the first end 311 of the hollow transmission shaft 31. Specifically, as shown in Figure 10, when the guide pin assembly 4 and the pedicle screw assembly 6 are assembled at the first end 311 of the hollow drive shaft 31, the guide pin 43 passes through the hollow pedicle screw 61, and the connector 42 abuts against the hollow pedicle screw 61. As shown in Figures 2 and 6, the front end 21 of the central shaft 2 can be inserted into the shaft hole 410 of the sleeve 41, so that the central shaft 2, the sleeve 41, and the guide pin 43 are coaxially configured. Furthermore, as shown in Figure 2, the output shaft 52 of the reducer assembly 5, the hollow drive shaft 31, the connector 42 of the guide pin assembly 4, and the hollow pedicle screw 61 are coaxially configured. In conventional art, the guide pins of implantation devices are relatively long, requiring them to penetrate the entire device and directly connect to the drive motor during installation, which is quite inconvenient for assembly and / or disassembly. Compared to conventional art, the implantation device D provided by this invention has a shorter guide pin 43 in the guide pin assembly 4. The guide pin 43 is indirectly connected to the drive motor 1 (the guide pin 43 is connected to the central shaft 2 via a sleeve 41), making the guide pin assembly 4 relatively easy to assemble and / or disassemble. Furthermore, due to the shorter length of the guide pin 43, when the user uses the rotation of the guide pin 43 of the implantation device D for drilling, it is less likely to bend or deform due to external force, and the drilling position is less likely to slip or shift, resulting in higher drilling positioning accuracy. Furthermore, as shown in Figures 9 and 10, when the pedicle screw assembly 6 is assembled at the first end 311 of the hollow drive shaft 31, the U-shaped connector 62 of the pedicle screw assembly 6 will be connected to the retainer 7, and the external thread 321 of the hollow connecting shaft 32 and the internal thread 621 of the U-shaped connector 62 can mesh with each other, so that the hollow connecting shaft 32 is further connected to the pedicle screw assembly 6. The operation steps of the implantation device D provided by the present invention are further described below, mainly divided into two stages: drilling and implantation. As shown in Figures 2, 9, and 10, in the drilling stage, the drive motor 1 drives the central shaft 2 to rotate along the first rotation direction R1 (see Figure 2). The central shaft 2 drives the guide needle 43 forward through the sleeve 41, and the sleeve 41 and the guide needle 43 rotate simultaneously along the first rotation direction R1. The guide needle 43 drills into a surgical site (e.g., the spine) at a high speed and low torque to form a guide hole (not shown). After the guide hole is formed, the drive motor 1 stops driving the central shaft 2, causing the central shaft 2 and the guide needle 43 to stop rotating. Next, the drive motor 1 drives the reducer 51 through the internal one-way bearing (not shown), and then the reducer 51 drives the hollow transmission shaft 31 to rotate along a second rotation direction R2 (see Figure 9). At this time, the hollow connecting shaft 32 located on the periphery remains stationary, and the second rotation direction R2 is opposite to the first rotation direction R1. By using a one-way bearing configuration, the central shaft 2 can remain stationary when the drive motor 1 is driving in reverse. Next, the hollow drive shaft 31 drives the connecting piece 42 and the hollow pedicle screw 61 forward and rotates along the second rotation direction R2, so that the hollow pedicle screw 61 is inserted into the guide hole and locked at the surgical site in a low-speed, high-torque manner (achieved by the configuration of the reducer 51). It should also be noted that when the hollow pedicle screw 61 is inserted into the guide hole, the U-shaped connecting piece 62 is still fixed in place by the restraint of the retaining piece 7 and the hollow connecting shaft 32. As shown in Figures 9 and 10, further, when the hollow drive shaft 31 drives the connector 42 and the hollow pedicle screw 61 forward and locks into the surgical site, the sleeve 41 connecting the connector 42 also rotates along the second rotation direction R2. However, since the guide needle 43 is not rotating at this time, when the sleeve 41 rotates along the second rotation direction R2, the meshing connection design between the internal thread 411 of the sleeve 41 and the external thread 431 of the guide needle 43 causes the sleeve 41 to rotate in the opposite direction relative to the guide needle 43, allowing the guide needle 43 to leave the surgical site and retract into the sleeve 41. Furthermore, at this time, the hollow pedicle screw 61 is advancing and locking into the surgical site, therefore the guide needle 43 retracts relative to the hollow pedicle screw 61 and retracts into the hollow pedicle screw 61. [Beneficial Effects of the Examples] The nail-planting device D provided by the present invention can be powered by a drive motor through a hollow drive shaft, and the guide pin assembly and the drive motor are respectively disposed at both ends of the hollow drive shaft, thereby shortening the length of the guide pin to reduce bending or deformation caused by external force, and thus improving the drilling positioning accuracy of the guide pin. Furthermore, conventional pin-mounting devices have relatively long guide pins, requiring them to penetrate the entire device and directly connect to the drive motor during installation, making assembly and / or disassembly quite inconvenient. In contrast, the pin-mounting device D provided by this invention features a shorter guide pin 43 in the guide pin assembly 4. The guide pin 43 is indirectly connected to the drive motor 1 (connected to the central shaft 2 via a sleeve 41), making assembly and / or disassembly of the guide pin assembly 4 relatively convenient. Moreover, due to the shorter length of the guide pin 43, when the user rotates the guide pin 43 of the pin-mounting device D for drilling, the shorter length makes it less prone to bending or deformation due to external forces, reducing the likelihood of slippage or displacement of the drilling position, thus resulting in higher drilling positioning accuracy. Furthermore, the implantation device D provided by this invention can first drill a guide hole (not shown) into a surgical site (e.g., the spine) using a guide needle 43 at high speed and low torque, and then insert a hollow pedicle screw 61 into the guide hole at low speed and high torque to lock it onto the surgical site. In other words, the user can complete multiple steps such as drilling and implantation using only the implantation device D of this invention, without the need for other surgical instruments. This not only reduces the number of instrument changes but also reduces the complicated procedures required for instrument changes, effectively improving surgical efficiency. The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the scope of the patent application of the present invention. D: Implantation device 1: Drive motor 2: Central shaft 3: Transmission assembly 31: Hollow transmission shaft 311: First end 312: Second end 32: Hollow connecting shaft 321: External thread 33: Fastener 34: Limiting component 4: Guide pin assembly 41: Sleeve 410: Guide hole 411: Internal thread 42: Connector 421: Protrusion 43: Guide pin 431: External thread 5: Reducer assembly 51: Reducer 52: Output shaft 6: Pedicle screw assembly 61: Hollow pedicle screw 62: U-shaped connector 621: Internal thread 620: Through hole 7: Holding component R1: First rotation direction R2: Second rotation direction Figure 1 is a schematic diagram of the nail-planting device of the present invention. Figure 2 is an exploded view of the nail-planting device of the present invention. Figure 3 is a schematic diagram of the transmission components of the nail-planting device of the present invention. Figure 4 is a schematic diagram of the guide pin assembly of the implantation device of the present invention. Figure 5 is a schematic cross-sectional view of the VV section in Figure 4. Figure 6 is a schematic diagram of the pedicle screw assembly of the implantation device of the present invention. Figure 7 is a schematic diagram of the guide pin assembly of the nail implantation device of the present invention assembled with the transmission assembly. Figure 8 is a schematic diagram of the fastening component of the nail-planting device of the present invention assembled with the transmission assembly. Figure 9 is a schematic diagram of the pedicle screw assembly of the implantation device of the present invention assembled with the transmission assembly and the retaining member. Figure 10 is a partially enlarged cross-sectional schematic diagram of the nail-planting device of the present invention. D: Screw anchoring device 1: Drive motor 3: Transmission components 312: Second end 33: Fasteners 4: Guide pin assembly 5: Gearbox assembly 6: Pedicle screw assembly 7: Holding components

Claims

1. A nail implantation device, comprising: One drive motor; A central shaft, with power connected to the drive motor; A transmission assembly includes a hollow transmission shaft sleeved around a central shaft and coaxially configured with the central shaft. The hollow transmission shaft is poweredly connected to a drive motor. The hollow transmission shaft has a first end and a second end, and the drive motor is disposed at the second end. A guide needle assembly is detachably assembled to the first end of the hollow transmission shaft. The guide needle assembly includes: a sleeve connected to the central shaft; a hollow connector detachably connected to the sleeve; and a guide needle passing through the connector and connected to the sleeve. The hollow transmission shaft is sleeved around the sleeve and connected to the connector. A speed reducer assembly is disposed at the second end of the hollow transmission shaft and is used to connect the drive motor and the hollow transmission shaft. A pedicle screw assembly includes a hollow pedicle screw, which is detachably assembled to the first end of the hollow transmission shaft and connected to the guide needle assembly. The nail-planting device as described in claim 1, wherein... The speed reducer assembly includes a speed reducer and an output shaft connected to the speed reducer. The speed reducer is connected to the drive motor, and the output shaft is connected to the hollow drive shaft. The nail-planting device as described in claim 2, wherein... The output shaft, the hollow drive shaft, the connector, and the hollow pedicle screw are coaxially configured. The nail-planting device as described in claim 1, wherein... The central shaft, the sleeve, and the guide pin are coaxially configured. The nail-planting device as described in claim 1, wherein... The guide pin is indirectly connected to the drive motor. The nail-planting device as described in claim 1, wherein... The inner wall of the sleeve has an internal thread, and the surface of the guide pin has an external thread. The sleeve and the guide pin are connected to each other by the engagement of the internal thread and the external thread. The nail-planting device as described in claim 1, wherein... The pedicle screw assembly also includes a U-shaped connector with a through hole through which the hollow pedicle screw passes and is engaged with the U-shaped connector. The nail-planting device as described in claim 7, wherein... When the guide needle assembly and the pedicle screw assembly are assembled at the first end of the hollow drive shaft, the guide needle passes through the hollow pedicle screw, and the connector abuts against the hollow pedicle screw. The nail-planting device as described in claim 8, wherein... The transmission assembly also includes a hollow connecting shaft sleeved on the hollow transmission shaft. The outer wall of the hollow connecting shaft has an external thread, and the inner wall of the U-shaped connector has an internal thread. When the pedicle screw assembly is assembled at the first end of the hollow transmission shaft, the hollow connecting shaft and the U-shaped connector are connected by the engagement of the internal thread and the external thread. The nail-planting device as described in claim 7 further includes a retaining member, which is sleeved around the transmission assembly and connected to the U-shaped connector. The nail-planting device as described in claim 1, wherein... The drive motor drives the central shaft to rotate in a first rotation direction, causing the central shaft to drive the sleeve and the guide pin forward, and the sleeve and the guide pin rotate simultaneously in the first rotation direction. The nail-planting device as described in claim 11, wherein... The drive motor drives the hollow drive shaft to rotate in a second rotation direction, causing the hollow drive shaft to drive the connector and the hollow vertebral stud forward. The connector and the hollow vertebral stud rotate simultaneously in the second rotation direction, which is opposite to the first rotation direction. The nail-planting device as described in claim 12, wherein... As the hollow pedicle screw advances and simultaneously rotates in the second rotation direction, the guide pin retracts relative to the hollow pedicle screw and retracts into the interior of the hollow pedicle screw.

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