Universal screwdriver

Abstract

The embodiment of the invention provides a universal screwdriver, and relates to the field of medical instruments. The universal screwdriver comprises a dowel bar assembly and an end assembly, the dowel bar assembly comprises an outer pipe and an inner rod, the inner rod is arranged in the outer pipe in a sliding mode in the first direction, and an insertion piece is arranged at the end of the inner rod; the end head assembly comprises a universal head and a head rod connector, the universal head is rotatably connected to the head rod connector in the second direction, the head rod connector is rotatably connected to the end of the outer pipe in the third direction, a clamping tooth face is arranged on the side, close to the inserting piece, of the head rod connector, and the inserting piece can be inserted into the clamping tooth face. The head spring is arranged between the universal head and the head rod connector, and the universal head is jointly fixed by the head spring, the inserting piece and the clamping tooth face. The universal head can be adjusted at any angle, the head rod connector is positioned and fixed by inserting the inserting piece into the clamping tooth face, then the universal head is pressed on the head rod connector by the head spring to be positioned and fixed, and it can be guaranteed that the angle or position of the universal head cannot be changed in the screw screwing process.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to a universal screwdriver. Background Technology

[0002] A universal screwdriver is used during hip replacement surgery to fix a bio-type acetabular cup in the acetabular bone using screws. The fixation posture of the bio-type acetabular cup needs to be matched with the angle suitable for the human body. Therefore, the angle when turning the screw with the universal screwdriver will vary from person to person.

[0003] The adjustable range of the universal head of the existing universal screwdriver is limited, and it cannot be adjusted to any angle, so it cannot be adapted to the installation of screws with various angles. Moreover, the existing universal head is prone to changes in angle or position during the turning process, which affects the installation accuracy of the screw. Summary of the Invention

[0004] This invention provides a universal screwdriver that can solve the above-mentioned problems.

[0005] The embodiments of the present invention can be implemented as follows: An embodiment of the present invention provides a universal screwdriver, comprising: A force transmission rod assembly includes an outer tube and an inner rod, the inner rod being slidably disposed inside the outer tube along a first direction, and an insert being provided at the end of the inner rod; The end assembly includes a universal head and a head rod connector. The universal head is rotatably connected to the head rod connector in a second direction, and the head rod connector is rotatably connected to the end of the outer tube in a third direction. The head rod connector has a retaining tooth surface on the side near the insert, and the insert can be inserted into different positions on the retaining tooth surface. A head spring is disposed between the universal head and the head rod connector, and the head spring, the insert, and the retaining tooth surface together fix the universal head.

[0006] Optionally, the force transmission rod assembly also includes a handle and an inner rod spring. The handle is connected to the inner rod to drive the inner rod to move inside the outer tube. The inner rod spring is located at the end of the inner rod to drive the inner rod to return to its original position.

[0007] Optionally, the handle includes a sleeve portion and an annular portion. The sleeve portion is fitted onto the outside of the outer tube and is slidable. The sleeve portion is provided with a through hole, the outer tube is provided with a strip hole, and the inner rod is provided with a radial hole. The same handle pin is inserted into the through hole, the strip hole, and the radial hole.

[0008] Optionally, the universal screwdriver also includes a grip assembly that is connected to the lever assembly.

[0009] Optionally, the grip assembly includes a handle core and a handle sleeve, with one end of the handle core inserted into the outer tube and the handle sleeve disposed within the handle core.

[0010] Optionally, the handle sleeve is provided with anti-slip grooves and tapered grooves, with the tapered grooves located on the side near the universal head.

[0011] Optionally, a limiting protrusion is provided at one end of the handle inner core that is inserted into the outer tube, and a limiting protrusion is provided at the end of the inner rod. An inner rod spring is provided between the limiting protrusion and the limiting protrusion.

[0012] Optionally, the end assembly also includes a retaining ring, and the end of the universal joint is provided with a retaining groove, in which the retaining ring is fitted. The retaining ring is used to increase damping with the screw.

[0013] Optionally, the end assembly also includes a spring cap, with a head spring disposed on the spring cap, and the spring cap abutting against the head rod connector.

[0014] Optionally, the outer tube is also provided with weight reduction holes and weight reduction grooves.

[0015] Beneficial effects of the embodiments of the present invention: This universal screwdriver includes a force transmission rod assembly and an end assembly. The force transmission rod assembly includes an outer tube and an inner rod, with the inner rod slidably disposed inside the outer tube along a first direction. An insert is provided at the end of the inner rod. The end assembly includes a universal head and a head rod connector. The universal head is rotatably connected to the head rod connector in a second direction, and the head rod connector is rotatably connected to the end of the outer tube in a third direction. The head rod connector has a retaining tooth surface near the insert, allowing the insert to be inserted into different positions on the retaining tooth surface. A head spring is disposed between the universal head and the head rod connector, and the head spring, insert, and retaining tooth surface together fix the universal head. Because the universal head can rotate in the second direction and the head rod connector can rotate in the third direction, the universal head can be adjusted at any angle, accommodating the installation of screws at various angles. The insert is inserted into the retaining tooth surface to position and fix the head rod connector, and the head spring further presses the universal head against the head rod connector for positioning and fixation. This ensures that the universal head does not change angle or position during screw tightening, enabling stable and reliable screw insertion with high precision. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the universal screwdriver provided in an embodiment of the present invention; Figure 2 This is a schematic axial cross-sectional view of the universal screwdriver provided in an embodiment of the present invention; Figure 3 This is a partial cross-sectional view of the connection between the handle and the inner rod provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the connection between the end assembly and the force transmission rod assembly provided in an embodiment of the present invention; Figure 5 This is a cross-sectional schematic diagram showing the connection between the end assembly and the force transmission rod assembly provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the outer tube provided in an embodiment of the present invention; Figure 7 This is a structural schematic diagram of the handle component provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the inner rod provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the head rod connector provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the universal joint provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the spring cap provided in an embodiment of the present invention; Figure 12 This is a schematic diagram of the clasp structure provided in an embodiment of the present invention; Figure 13 This is a schematic diagram of the handle sleeve provided in an embodiment of the present invention; Figure 14 This is a schematic diagram of the handle inner core provided in an embodiment of the present invention; Figure 15 This is a schematic diagram of the structure of the handle pin / first connecting pin / second connecting pin provided in an embodiment of the present invention.

[0018] Icons: 1-Grip assembly; 10-Handle inner core; 101-First blocking ring; 102-Second blocking ring; 103-Limiting protrusion; 12-Handle sleeve; 121-Anti-slip groove; 122-Conical groove; 2-Force transmission rod assembly; 20-Outer tube; 202-Head end pin hole; 203-U-shaped seat; 204-Strip hole; 205-Weight reduction groove; 206-Weight reduction hole; 21-Inner rod; 211-Insertion piece; 212-Limiting protrusion; 213-Radial hole; 22-Handle piece; 221-Sleeve part; 2211- 222-Through hole; 23-Ring part; 24-Handle pin; 3-Inner rod spring; 3-End assembly; 30-Universal head; 301-End head; 3011-Slot; 302-Connecting part; 3021-Connecting hole; 31-Head rod connector; 311-First pin hole; 312-Second pin hole; 313-Clamping tooth surface; 321-First connecting pin; 322-Second connecting pin; 33-Clamping ring; 34-Head spring; 35-Spring cap; 351-Cap cover; 352-Cap sleeve; 353-Cap post; 4-Screw. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Unless otherwise explicitly specified and limited, terms such as "setup" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] It should be noted that, for the sake of simplicity, the aforementioned method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, because according to this application, some steps can be performed in other orders or simultaneously. The steps in the methods of this application embodiments can be adjusted, combined, or deleted according to actual needs.

[0027] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0028] Currently, in hip replacement surgery, the fixation of the bio-type acetabular cup is crucial, and good initial stability is one of the important factors for surgical success. Fixation of the bio-type acetabular cup mainly involves using screws to pass through pre-drilled holes in the cup and secure it to the acetabular bone. The reliability of the cup's fixation directly affects its initial stability; therefore, efficient and smooth screw insertion not only improves the initial stability of the cup but also further reduces the surgeon's operation time and increases surgical efficiency.

[0029] Fixing the acetabular cup to the acetabular bone with screws requires the use of a universal screwdriver. Because the fixing angle and posture of the acetabular cup need to be matched to the angle suitable for the human body, the angle will vary depending on the individual when using the universal screwdriver to tighten the screw. The inventors discovered that the adjustable range of the universal head of existing universal screwdrivers is limited, unable to meet the requirement of adjusting to any angle, thus failing to accommodate the installation of screws with various angles. Furthermore, the existing universal head is prone to angle or position changes during tightening, affecting the installation accuracy of the screw, and the screw is also prone to falling out when engaging the universal head.

[0030] In view of this, an embodiment of the present invention provides a universal screwdriver that can solve the above problems, which will be described in detail below.

[0031] Please refer to Figures 1 to 5 The universal screwdriver includes a grip assembly 1, a force transmission rod assembly 2, and an end assembly 3. The grip assembly 1 is located at one end of the force transmission rod assembly 2, and the end assembly 3 is located at the other end of the force transmission rod assembly 2. The grip assembly 1 is used to allow the user to grip and apply force. The force transmission rod assembly 2 is used to transmit the force to the end assembly 3. The end assembly 3 is used to cooperate with the screw 4 and tighten the screw 4.

[0032] The force transmission rod assembly 2 includes an outer tube 20 and an inner rod 21. The inner rod 21 is slidably disposed inside the outer tube 20 along a first direction, and an insert 211 is provided at the end of the inner rod 21. The end assembly 3 includes a universal head 30 and a head rod connector 31. The universal head 30 is rotatably connected to the head rod connector 31 around a second direction, and the head rod connector 31 is rotatably connected to the end of the outer tube 20 around a third direction. A retaining tooth surface 313 is provided on the side of the head rod connector 31 near the insert 211. The insert 211 can be inserted into different positions on the retaining tooth surface 313. A head spring 34 is disposed between the universal head 30 and the head rod connector 31. The head spring 34, the insert 211, and the retaining tooth surface 313 together fix the universal head 30. Since the universal head 30 can rotate around the second direction and the head rod connector 31 can rotate around the third direction, the universal head 30 can be adjusted at any angle to meet the installation of screws 4 at various angles. The head rod connector 31 is positioned and fixed by inserting the insert plate 211 into the tooth surface 313, and the head spring 34 presses the universal head 30 into the head rod connector 31 for positioning and fixing. This ensures that the universal head 30 will not change its angle or position during the screw 4 turning process, and can stably and reliably insert the screw 4 with high precision requirements.

[0033] In this embodiment, the first direction is along the axial direction of the outer tube 20, the second direction is perpendicular to the first direction, and the third direction is perpendicular to both the first and second directions.

[0034] refer to Figure 6 , Figure 7 and combined Figure 3 The outer tube 20 is a hollow straight tube, and the inner rod 21 passes through the inside of the outer tube 20 and can move axially. A strip hole 204 is opened at one end of the outer tube 20 near the grip component 1. The strip hole 204 is opened along the axial direction of the outer tube 20 and passes through the tube wall of the outer tube 20. A handle 22 is provided on the outside of the outer tube 20. The handle 22 passes through the strip hole 204 and is connected to the inner rod 21, so that the user can drive the inner rod 21 to move by turning the handle 22.

[0035] The handle 22 includes a sleeve portion 221 and an annular portion 222, which are fixedly connected or integrally formed. The sleeve portion 221 is fitted onto the outside of the outer tube 20 and can slide along the outer tube 20. The annular portion 222 protrudes from the sleeve portion 221 to provide a driving force point for the user. The sleeve portion 221 has a through hole 2211 that penetrates the sleeve wall. The inner rod 21 has a radial hole 213 that penetrates the inner rod 21. When the through hole 2211 of the sleeve portion 221 and the strip of the outer tube 20 are connected, the handle 222 can be driven by the handle. After the slotted hole 204 is aligned and connected with the radial hole 213 of the inner rod 21, a handle pin 23 can be inserted through the through hole 2211, the slotted hole 204 and the radial hole 213 to connect the handle 22 and the inner rod 21. Moving the handle 22 can drive the handle pin 23 to move along the slotted hole 204, and at the same time drive the inner rod 21 to move axially. In addition, the handle pin 23 passing through the slotted hole 204 and the radial hole 213 of the inner rod 21 can radially position the inner rod 21 inside the outer tube 20. The inner rod 21 cannot rotate inside the outer tube 20, but can only move axially.

[0036] An inner rod spring 24 is also provided at the end of the inner rod 21. One end of the inner rod spring 24 abuts against the inner rod 21, and the other end abuts against the end of the handle core 10 of the grip assembly 1. When the inner rod 21 moves under the action of external force, the inner rod spring 24 is compressed. When the external force on the inner rod 21 is removed, the compressed inner rod spring 24 can push the inner rod 21 to return to its original position.

[0037] Optionally, the end face of the inner rod 21 is provided with a limiting protrusion 212 along its axial direction, the end face of the handle inner core 10 is provided with a limiting protrusion 103, and the two ends of the inner rod spring 24 are respectively sleeved on the limiting protrusion 103 and the limiting protrusion 212, thereby achieving positioning and fixation.

[0038] A U-shaped seat 203 is fixedly connected to one end of the outer tube 20 near the end assembly 3. The U-shaped seat 203 can be fixed to the outer tube 20 by integral molding, welding, or bonding. The U-shaped seat 203 has a U-shaped receiving cavity that can accommodate the head rod connector 31. Head pin holes 202 are opened on opposite side walls of the U-shaped seat 203. A second pin hole 312 is opened on the head rod connector 31 along a third direction. The second pin hole 312 corresponds to the head pin hole 202. By inserting a second connecting pin 322 into the second pin hole 312 and the head pin hole 202, the head rod connector 31 can be rotatably connected to the end of the outer tube 20, and the head rod connector 31 can rotate around the second connecting pin 322.

[0039] refer to Figure 8 and Figure 9 An insert 211 is provided at the end of the inner rod 21 away from the gripping component 1. The insert 211 can be a square thin sheet. A retaining tooth surface 313 is provided on the side of the head rod connector 31 near the insert 211. The retaining tooth surface 313 is an arc-shaped surface with multiple spaced retaining tooth grooves. The insert 211 can be inserted into different retaining tooth grooves, thereby positioning and fixing the head rod connector 31 at different tilt angles. Moving the handle 22 can drive the inner rod 21 to move axially inside the outer tube 20, causing the insert 211 at the end of the inner rod 21 to disengage from the retaining tooth surface 313 of the head rod connector 31. At this time, the user can rotate and adjust the head rod connector 31 to a suitable angle, and then release the handle 22. The inner rod spring 24 drives the inner rod 21 to move and reset, and the insert 211 at the end of the inner rod 21 is inserted into the aligned retaining tooth groove on the retaining tooth surface 313, thereby pressing and fixing the head rod connector 31. It is understandable that the tooth groove on the tooth surface 313 is adapted to the size and orientation of the insert 211. When the insert 211 is inserted into a tooth groove, the insert 211 will not slide in the tooth groove.

[0040] The head connector 31 also has a first pin hole 311, which is formed along a second direction. (Reference) Figure 10 The universal head 30 includes an end head 301 and a connecting part 302. The end head 301 and the connecting part 302 are connected by integral molding, welding, or bonding. The connecting part 302 has a U-shaped cavity, and part of the head rod connector 31 is accommodated in the U-shaped cavity. Connecting holes 3021 are provided on opposite sides of the U-shaped cavity. After the connecting holes 3021 are aligned and connected with the first pin hole 311, a first connecting pin 321 is inserted into the connecting holes 3021 and the first pin hole 311. The first connecting pin 321 connects the universal head 30 to the head rod connector 31, and the universal head 30 can rotate around the first connecting pin 321.

[0041] refer to Figure 11 and combined Figure 5To prevent angular or positional deviation when turning the universal joint 30 screw 4, a head spring 34 and a spring cap 35 are provided between the head rod connector 31 and the universal joint 30. The spring cap 35 includes a cap 351, a cap sleeve 352, and a cap post 353. The cap 351 is fixed to one end of the cap sleeve 352. The cap post 353 passes through the inside of the cap sleeve 352 and is fixed at one end to the cap 351. An annular cavity exists between the cap post 353 and the cap sleeve 352. The head spring 34 is sleeved on the cap post 353 and housed within the annular cavity. One end of the head spring 34 abuts against the cap 351, and the other end abuts against the bottom wall of the U-shaped cavity of the universal joint 30. After the screw 4 is assembled with the end head 301 of the universal head 30, external pressure in the first direction is applied by the gripping component 1. The external pressure acts on the head rod connector 31 through the inner rod 21. The head rod connector 31 abuts against the cap 351 of the spring cap 35, and the head spring 34 is compressed. The head spring 34 applies an elastic pressure to the cap 351 in the opposite direction to the external pressure. The cap 351 abuts against the head connector. The reaction force of the head spring 34 and the circumferential friction between the cap 352 and the universal head 30 fix the universal head 30 at a certain angle, so that the universal head 30 will not swing or deflect at an angle / position when the screw 4 is turned. This allows the screw 4 to be inserted into the screw hole reserved in the acetabular cup more accurately, which is beneficial to improving the success rate of the operation and improving the initial stability of the acetabular cup.

[0042] The inventors discovered that most screws 4 used to fix the acetabular cup are countersunk hexagonal screws, and the head 301 of the universal head 30 is mostly a hexagonal prism. After the head 301 of the universal head 30 is inserted into the countersunk hole of the screw 4, the screw 4 is prone to falling out. The damping between the screw 4 and the head 301 of the universal head 30 is small, which affects the efficiency of the operation.

[0043] Therefore, in this embodiment, the end head 301 of the universal head 30 is provided with a groove 3011, which is arranged around the end head 301. A retaining ring 33 is also provided within the groove 3011. When the retaining ring 33 is fitted into the groove 3011, its outer edge protrudes from the groove 3011. This increases the damping between the retaining ring 33 and the screw 4 during assembly, preventing the screw 4 from falling off the end head 301 and thus improving surgical efficiency. (Reference) Figure 12 In this embodiment, the retaining ring 33 is a metal ring with a discontinuous notch, so that when it is assembled with the internal hexagon countersunk hole of the screw 4, the outward expansion elasticity of the metal ring can be used to reliably cooperate with the screw 4.

[0044] Besides using the retaining ring 33 to increase damping between the universal joint 30 end head 301 and the screw 4, other methods can also be used to increase damping between them. For example, a flexible protrusion or flexible ring can be provided on the outer peripheral wall of the universal joint 30 end head 301. This way, after insertion into the countersunk hole of the screw 4, the flexible protrusion or flexible ring can increase frictional damping, effectively preventing the screw 4 from falling off the end head 301. Of course, other specific methods can be used to increase damping between the end head 301 and the screw 4, and this is not limited to these methods.

[0045] refer to Figure 13 , Figure 14 and Figure 2 The grip assembly 1 includes a handle inner core 10 and a handle sleeve 12. The handle inner core 10 has a small-diameter end and a large-diameter end. The small-diameter end is inserted into the inside of the outer tube 20 and fixedly connected to the outer tube 20. A second blocking ring 102 is provided at the large-diameter end of the handle inner core 10, and a first blocking ring 101 is provided at the junction of the large-diameter end and the small-diameter end. The handle sleeve 12 is provided on the outside of the handle inner core 10 and its two ends abut against the first blocking ring 101 and the second blocking ring 102. The handle sleeve 12 is fixed by the first blocking ring 101 and the second blocking ring 102.

[0046] The handle sleeve 12 is provided with multiple anti-slip grooves 121 and multiple conical grooves 122. The multiple anti-slip grooves 121 are located on the side near the second blocking ring 102. The multiple anti-slip grooves 121 can increase the friction between the handle and the user's hand, so that it will not slip during use and it is easy to rotate and exert force. Of course, the anti-slip grooves 121 can also be replaced with anti-slip textures or anti-slip protrusions, as long as they can achieve the anti-slip effect. This embodiment does not limit this. The multiple conical grooves 122 are located on the side near the handle 22, so that the handle 22 can be turned with the fingers to drive the inner rod 21 to move axially.

[0047] Optionally, the handle sleeve 12 can be made of a non-slip material to further enhance the anti-slip effect. For example, silicone material can be used, which not only makes the grip more comfortable but also prevents slipping even when there is blood or liquid on it. The length of the handle sleeve 12 and the large-diameter end of the handle core 10 needs to be designed according to ergonomics, neither too long nor too short.

[0048] Alternatively, the handle core 10 can be made of metal materials such as aluminum alloy or stainless steel, which can increase the overall strength and durability.

[0049] Optionally, in order to reduce the overall weight of the universal screwdriver in this embodiment, multiple weight-reducing holes 206 and weight-reducing grooves 205 can be provided on the wall of the outer tube 20. The weight-reducing holes 206 are evenly distributed on the wall of the outer tube 20, so that the center of gravity of the outer tube 20 will not shift. The weight-reducing grooves 205 can be provided at one end close to the end assembly 3, which can reduce the weight of the universal screwdriver head and make it easier for the user to hold and exert force.

[0050] refer to Figure 15 The handle pin 23, the first connecting pin 321 and the second connecting pin 322 are all rounded at both ends, which can serve as a guide during assembly and make it easier to insert into the hole.

[0051] In this embodiment, the universal screwdriver can fix the head rod connector 31 at any angle by engaging the inner rod 21 insert 211 with the retaining tooth surface 313. The universal head 30 is rotatably connected to the head rod connector 31, and the head rod connector 31 is rotatably connected to the outer tube 20, allowing the universal head 30 to rotate to any angle. The engagement of the head spring 34 and the spring cap 35 allows the universal head 30 to be positioned at any angle without swaying or deflecting, which helps improve the reliability and stability of tightening the screw 4. The retaining ring 33 at the end head 301 of the universal head 30 increases the damping with the screw 4, preventing the screw 4 from falling off the end head 301, which helps improve surgical efficiency.

[0052] The method of using the universal screwdriver according to an embodiment of the present invention: Insert the hexagonal end 301 of the universal head 30 into the recessed hexagonal hole of the screw 4. Because the end 301 is equipped with a retaining ring 33, the damping between the screw 4 and the end 301 is increased, allowing the screw 4 to stably assemble and engage with the end 301. The user holds the handle sleeve 12 and uses their fingers to turn the pull handle 22. The pull handle 22, through the pull pin 23, moves the inner rod 21 towards the inner core 10 of the handle. The user's other hand rotates the head rod connector 31 to adjust its angle. Then... Release the lever 22, and under the action of the inner rod spring 24, the insert 211 at the end of the inner rod 21 is inserted into the corresponding slot on the tooth surface 313, thereby fixing the head rod connector 31. Rotate the universal head 30. Since there is a spring cap 35 and a head spring 34 between the universal head 30 and the head rod connector 31, the universal head 30 is pressed and positioned during rotation, and the screw 4 is positioned in space at a suitable angle. By applying force through the handle sleeve 12 to turn the universal screwdriver, the screw 4 is driven to fix the acetabular cup in the acetabular bone.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A universal screwdriver, characterized in that, include: The force transmission rod assembly (2) includes an outer tube (20) and an inner rod (21). The inner rod (21) is slidably disposed inside the outer tube (20) along a first direction, and an insert (211) is provided at the end of the inner rod (21). The end assembly (3) includes a universal head (30), a head rod connector (31), and a head spring (34). The universal head (30) is rotatably connected to the head rod connector (31) in a second direction. The head rod connector (31) is rotatably connected to the end of the outer tube (20) in a third direction. The head rod connector (31) has a toothed surface (313) on the side near the insert (211). The insert (211) can be inserted into different positions on the toothed surface (313). The head spring (34) is disposed between the universal head (30) and the head rod connector (31). The head spring (34), the insert (211), and the toothed surface (313) together fix the universal head (30).

2. The universal screwdriver according to claim 1, characterized in that, The force transmission rod assembly (2) also includes a handle (22) and an inner rod spring (24). The handle (22) is connected to the inner rod (21) to drive the inner rod (21) to move inside the outer tube (20). The inner rod spring (24) is disposed at the end of the inner rod (21) to drive the inner rod (21) to reset.

3. The universal screwdriver according to claim 2, characterized in that, The handle component (22) includes a sleeve portion (221) and an annular portion (222). The sleeve portion (221) is sleeved on the outside of the outer tube (20) and is slidable. The sleeve portion (221) is provided with a through hole (2211). The outer tube (20) is provided with a strip hole (204). The inner rod (21) is provided with a radial hole (213). The through hole (2211), the strip hole (204) and the radial hole (213) are all fitted with the same handle pin (23).

4. The universal screwdriver according to claim 1, characterized in that, The universal screwdriver also includes a grip assembly (1), which is connected to the force transmission rod assembly (2).

5. The universal screwdriver according to claim 4, characterized in that, The grip assembly (1) includes a handle inner core (10) and a handle sleeve (12). One end of the handle inner core (10) is inserted into the outer tube (20), and the handle sleeve (12) is disposed on the handle inner core (10).

6. The universal screwdriver according to claim 5, characterized in that, The handle sleeve (12) is provided with an anti-slip groove (121) and a conical groove (122), the conical groove (122) being located on the side close to the universal head (30).

7. The universal screwdriver according to claim 5, characterized in that, The inner core (10) of the handle is inserted into one end of the outer tube (20) and is provided with a limiting protrusion (103). The end of the inner rod (21) is provided with a limiting protrusion (212). An inner rod spring (24) is provided between the limiting protrusion (103) and the limiting protrusion (212).

8. The universal screwdriver according to any one of claims 1-7, characterized in that, The end assembly (3) also includes a retaining ring (33). The end head (301) of the universal head (30) is provided with a retaining groove (3011). The retaining ring (33) is sleeved in the retaining groove (3011). The retaining ring (33) is used to increase the damping with the screw (4).

9. The universal screwdriver according to claim 8, characterized in that, The end assembly (3) also includes a spring cap (35), the head spring (34) is disposed on the spring cap (35), and the spring cap (35) abuts against the head rod connector (31).

10. The universal screwdriver according to claim 8, characterized in that, The outer tube (20) is also provided with a weight reduction hole (206) and a weight reduction groove (205).

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