Swing arm structure for CT positioning head clamp

Abstract

The application discloses a swing arm structure for a CT positioning head clamp, relates to the technical field of medical devices, and solves the problems that a traditional clamping wall cannot self-adapt to a head contour and pressure distribution is uneven. The structure comprises a base, a first swing assembly, a second swing assembly and a negative pressure telescopic device, the negative pressure telescopic device is fixed symmetrically on the base in an inclined manner, a bearing at a telescopic end of the negative pressure telescopic device is matched with an arc-shaped groove of the first swing assembly, a positioning rod and a limiting rod are respectively matched with a positioning hole and an arc-shaped sliding hole, linear thrust is converted into swing arm rotating force, a detachable rubber pad is arranged on the inner side of the clamping wall, a sealing cover is clamped in an installation hole, and a handle is arranged at the top end of the arc-shaped groove. Through multi-stage motion transmission and composite constraint design, the structure realizes stable head positioning, uniform pressure distribution, improves patient comfort, and has artificial adjustment and protection functions.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a head clip for CT positioning. Background Technology

[0002] In computed tomography (CT) scans, precise positioning and stable fixation of the patient's head are crucial for ensuring image quality. As a core tool in modern medical diagnosis, CT scans are widely used for the precise assessment of brain diseases, trauma, and tumors. The imaging process requires the patient's head to remain absolutely still during the scan. Current CT head clamps generally employ a rigid clamping arm structure. A mechanical drive mechanism moves the clamping wall towards the patient's head. The clamping wall surface has a contact surface with a fixed curvature, using linear motion to achieve head clamping and fixation. This approach has become a standardized procedure in clinical practice.

[0003] However, in the existing technology, the contact state between the clamping wall and the patient's head is difficult to dynamically adapt to the head contour characteristics of different individuals, resulting in a non-uniform pressure distribution during the clamping process. Summary of the Invention

[0004] This application provides a swing arm structure for a CT positioning head clamp that can solve the technical problems of traditional clamping structures being unable to adaptively conform to the contour of the patient's head and uneven pressure distribution.

[0005] To achieve the above objectives, this application provides the following technical solution: A swing arm structure for a CT positioning head clip includes: a base, two first swing assemblies, two second swing assemblies, and two negative pressure telescopic devices; the negative pressure telescopic devices are obliquely and symmetrically fixed on the left and right sides of the base, the second swing assemblies are rotatably mounted on their respective negative pressure telescopic devices, and the first swing assemblies are rotatably mounted on the front of their respective second swing assemblies; a bearing is rotatably mounted on the telescopic end of each negative pressure telescopic device, the top of each negative pressure telescopic device is open, and a positioning rod and a limiting rod are fixedly mounted on the front and rear inner walls of the opening, and the bearing, positioning rod, and limiting rod are all matched with the first swing assemblies. The first swing assembly includes a swing arm, with a positioning hole and an arc-shaped sliding hole on the front side of the swing arm, and an arc-shaped groove on the bottom of the swing arm. The positioning hole cooperates with a positioning rod, the arc-shaped sliding hole cooperates with a limiting rod, and the arc-shaped groove cooperates with a bearing. A rotating sleeve is fixedly installed on the front side of the arc-shaped groove, and a limiting block is fixedly installed on the periphery of the rotating sleeve. The first swing assembly has a mounting hole on the front side, which is connected to the rotating sleeve and has a larger diameter than the rotating sleeve. A sealing cap is snapped into the mounting hole. A handle is fixedly installed at an angle at the top of the arc-shaped groove.

[0006] In one optional embodiment, the base is an installation platform that supports the entire structure and is used to carry and fix the negative pressure telescopic device, the second swing assembly, and the first swing assembly.

[0007] In one optional embodiment, the positioning hole is fitted onto the positioning rod. The positioning hole is a through hole structure opened on the front of the swing arm, and its diameter is slightly larger than the outer diameter of the positioning rod, which is used to limit radial displacement and fix the swing center.

[0008] In one optional embodiment, the limiting rod is inserted into an arc-shaped sliding hole and slides. The arc-shaped sliding hole is an elongated through groove on the front of the swing arm, and its outline is an arc segment with the axis of the positioning rod as the center, used to control the swing angle of the swing arm.

[0009] In one optional embodiment, the second swing assembly includes a clamping wall, a connecting circular groove is provided on the rear side of the clamping wall, a threaded hole post is fixedly installed inside the connecting circular groove, a limit bolt is provided in the threaded hole post, and a limit groove is provided on the inner circumferential wall of the connecting circular groove, the limit groove cooperating with a limit block.

[0010] In one optional embodiment, two rubber pads are detachably installed on the inner side of the clamping wall. The rubber pads are flexible buffer structures made of medical-grade elastomer material and are symmetrically distributed on both sides of the longitudinal centerline of the clamping wall.

[0011] In one alternative embodiment, the limiting bolt passes through the mounting hole and is screwed into the threaded hole post, with the top of the limiting bolt located inside the mounting hole and leaving a gap between it and the top of the rotating sleeve.

[0012] In one alternative embodiment, the bearing rolls along the curved surface of an arc groove, the center of which coincides with the geometric center of the positioning hole, to convert the vertical thrust of the negative pressure telescopic device into the rotational force of the swing arm.

[0013] In one optional embodiment, the connecting groove and the rotating sleeve form a coaxial nested rotational fit, and the limiting block and the limiting groove cooperate to limit the maximum rotation angle of the clamping wall.

[0014] In one optional embodiment, the sealing cover is an elastic snap-on type cover that can be detachably snapped into the mounting hole to seal the internal space and prevent foreign objects such as dust and bodily fluids from entering the mating area between the rotating sleeve and the connecting groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This application provides a swing arm structure for a CT positioning head clamp. This design uses a positioning hole and a positioning rod to fix the swing center, ensuring the central stability of the swing arm's rotational movement. A limiting rod and an arc-shaped sliding hole control the swing angle of the swing arm, guiding it to retract stably along a preset arc path. A bearing and an arc-shaped groove convert the vertical thrust of the negative pressure telescopic device into the rotational force of the swing arm, achieving efficient torque conversion. The rotational motion is then transmitted through the connection between the rotating sleeve and the second swing assembly, allowing the clamping wall to rotate freely around a vertical axis. Furthermore, a limiting block and a limiting groove limit the rotation range of the clamping wall, preventing structural interference. Finally, a sealed cover snaps into the mounting hole for dust protection, while the tilted design of the handle facilitates manual adjustment. This design improves the pressure distribution when the clamping wall contacts the patient's head, allowing the rubber pad to adaptively conform to different head contours, avoiding localized pressure concentration, thereby enhancing the stability of head positioning and patient comfort. Attached Figure Description

[0016] Figure 1 This is a connection diagram of the swing arm structure of the CT positioning head clamp of the present invention in use. Figure 2 This is a cross-sectional schematic diagram of the swing arm structure of the CT positioning head clip embodiment of the present invention in use; Figure 3 This is a cross-sectional view of the first and second swing components in the installation state of the swing arm structure embodiment of the CT positioning head clip of the present invention; Figure 4 This is a front view of the overall structure of the first swing component in an embodiment of the swing arm structure for CT positioning head clamp of the present invention; Figure 5 This is a schematic diagram of the rear side of the overall structure of the second swing component in an embodiment of the swing arm structure for CT positioning head clamp of the present invention.

[0017] Figure label: 1. First swing component 11. Swing arm 12. Positioning holes 13. Arc-shaped sliding hole 14. Arc-shaped groove 15. Rotate the sleeve 16. Limiting block 17. Mounting holes 18. Sealing lid 19. Handle 2. Second swing component 21. Clamping wall 22. Rubber pad 23. Connecting circular groove 24. Threaded hole post 25. Limiting bolts 26. Limiting groove 3. Negative pressure expansion joint 31. Bearings 32. Positioning rod 33. Limiting rod 4. Base. Detailed Implementation

[0018] The technical solutions in the embodiments of this invention / invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention / invention, and not all embodiments. Based on the embodiments of this invention / invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention / invention.

[0019] Example 1: In the existing technology of CT examination, traditional clamping walls cannot automatically adjust their angle according to the patient's head contour, which can easily cause local pressure concentration and affect comfort. In addition, the clamping range of the clamping arm is difficult to adapt to the different head sizes and shapes of patients, resulting in insecure fixation or excessive pressure.

[0020] Based on the above issues, see Figure 1-5 This application provides a swing arm structure for a CT positioning head clamp. The structure includes a base 4, two first swing assemblies 1, two second swing assemblies 2, and two negative pressure telescopic devices 3. The negative pressure telescopic devices 3 are tilted and symmetrically fixed on the left and right sides of the base 4. The second swing assemblies 2 are rotatably mounted on their respective negative pressure telescopic devices 3. The first swing assemblies 1 are rotatably mounted on the front of their respective second swing assemblies 2. Bearings 31 are rotatably mounted on the telescopic ends of the negative pressure telescopic devices 3. The top of the negative pressure telescopic device 3 is open, and positioning rods 32 and limiting rods 33 are fixedly mounted on the front and rear inner walls of the opening. The bearings 31, positioning rods 32, and limiting rods 33 all cooperate with the first swing assemblies 1. The first swing assembly 1 includes a swing arm 11. The front of the swing arm 11 is provided with a positioning hole 12 and an arc-shaped sliding hole 13. The bottom of the swing arm 11 is provided with an arc-shaped groove 14. The positioning hole 12 cooperates with the positioning rod 32, the arc-shaped sliding hole 13 cooperates with the limiting rod 33, and the arc-shaped groove 14 cooperates with the bearing 31. A rotating sleeve 15 is fixedly installed on the front of the arc-shaped groove 14. A limiting block 16 is fixedly installed on the periphery of the rotating sleeve 15. The front of the first swing assembly 1 is provided with a mounting hole 17. The mounting hole 17 is connected to the rotating sleeve 15 and the diameter of the mounting hole 17 is larger than the diameter of the rotating sleeve 15. A sealing cover 18 is snapped into the mounting hole 17. A handle 19 is fixedly installed at the top of the arc-shaped groove 14 at an angle.

[0021] Step 1: The negative pressure telescopic device 3 is tilted and symmetrically fixed on the left and right sides of the base 4. The second swing assembly 2 is rotatably installed on the corresponding negative pressure telescopic device 3, and the first swing assembly 1 is rotatably installed on the front of the corresponding second swing assembly 2, wherein: In this embodiment, the negative pressure telescopic device 3 serves as the power input source. Its inclined arrangement creates a preset angle between the telescopic direction and the rotation plane of the swing arm 11, thereby applying a tangential force to the bearing 31 during the telescopic process, providing an initial torque for subsequent rotational motion. The inclined and symmetrical fixed arrangement means that the two negative pressure telescopic devices 3 are arranged in a mirror image with respect to the center line of the base 4, and their respective axes form the same acute angle with the vertical direction, ensuring the geometric symmetry and motion synchronization of the power input on both sides. The second swing assembly 2 is rotatably mounted on the corresponding negative pressure telescopic device 3, indicating that the second swing assembly 2 is related to the negative pressure telescopic device 3. The pressure telescopic devices 3 form a rotating pair, allowing the second swing assembly 2 to rotate relative to the negative pressure telescopic device 3 around its own mounting axis. This rotational freedom provides a basic motion space for the subsequent clamping wall 21 to adaptively conform to the head curvature. The first swing assembly 1 is rotatably mounted on the front of the corresponding second swing assembly 2, indicating that the first swing assembly 1 and the second swing assembly 2 also form a rotating pair, and the mounting surface is the front surface of the second swing assembly 2 facing the patient. This arrangement allows the rotational motion of the first swing assembly 1 to be directly transmitted to the second swing assembly 2, thereby driving the clamping wall 21 to move.

[0022] Step 2: A bearing 31 is rotatably mounted on the telescopic end of the negative pressure telescopic device 3. The top of the negative pressure telescopic device 3 is open, and a positioning rod 32 and a limiting rod 33 are fixedly mounted on the front and rear inner walls of the opening. The bearing 31, positioning rod 32, and limiting rod 33 all cooperate with the first swing assembly 1. In this embodiment, the bearing 31 is rotatably mounted at the end of the telescopic end of the negative pressure telescopic device 3, so that its outer ring can move synchronously with the telescopic end, while the inner ring can rotate freely relative to it. Thus, when it contacts the arc groove 14 of the swing arm 11, it can both bear the normal thrust and allow rolling motion. The positioning rod 32 is a rigid cylindrical positioning pin with its axis perpendicular to the top opening plane of the negative pressure telescopic device 3. It is used to limit the rotation center position of the swing arm 11. The limiting rod 33 is another rigid cylindrical guide pin, which is arranged parallel to the positioning rod 32 on the inner wall before / after the opening. It is used to constrain the movement trajectory of the swing arm 11.

[0023] Step 3: The first swing assembly 1 includes a swing arm 11. The front of the swing arm 11 has a positioning hole 12 and an arc-shaped sliding hole 13. The bottom of the swing arm 11 has an arc-shaped groove 14. The positioning hole 12 cooperates with the positioning rod 32, the arc-shaped sliding hole 13 cooperates with the limiting rod 33, and the arc-shaped groove 14 cooperates with the bearing 31. Wherein: The swing arm 11 is the main structural component that bears all the mating features. The positioning hole 12 is a through hole with a diameter slightly larger than the outer diameter of the positioning rod 32, allowing for small gap insertion. It is used to establish the rotation fulcrum between the first swing assembly 1 and the negative pressure telescopic device 3. The arc-shaped sliding hole 13 is a long strip-shaped through groove extending along a preset arc trajectory. Its curvature center coincides with the positioning hole 12. It is used to accommodate the limiting rod 33 and slide it in it, thereby limiting the maximum swing angle range of the swing arm 11. The arc-shaped groove 14 is a concave guide rail provided on the bottom edge of the swing arm 11. Its cross-section is arc-shaped and its curvature is consistent with the rolling path of the bearing 31. It is used to form a line contact rolling pair with the bearing 31 and convert the thrust into rotational torque.

[0024] Step 4: A rotating sleeve 15 is fixedly installed on the front of the arc-shaped groove 14. A limit block 16 is fixedly installed on the periphery of the rotating sleeve 15. A mounting hole 17 is opened on the front of the first swing assembly 1. The mounting hole 17 is connected to the rotating sleeve 15, and the diameter of the mounting hole 17 is larger than the diameter of the rotating sleeve 15. A sealing cover 18 is snapped into the mounting hole 17. The rotating sleeve 15 is a hollow cylindrical structure coaxially fixed to the front of the arc groove 14. Its inner hole is coaxial with the arc groove 14 and is used to form a rotational fit with the connecting circular groove 23 of the second swing assembly 2. The limiting block 16 is a rigid boss that protrudes radially from the outer periphery of the rotating sleeve 15. Its shape matches the contour of the limiting groove 26 of the second swing assembly 2 and is used to cooperate with the limiting groove 26 during rotation to limit the maximum rotation angle. The mounting hole 17 is a circular through hole that penetrates the front of the first swing assembly 1. Its axis coincides with the axis of the rotating sleeve 15. The hole diameter is larger than the outer diameter of the rotating sleeve 15 and provides space for the insertion and adjustment of the limiting bolt 25. The sealing cover 18 is an elastic snap-on cover that can be detachably snapped into the mounting hole 17 to seal the internal space and prevent foreign objects such as dust and body fluids from entering the mating area between the rotating sleeve 15 and the connecting circular groove 23.

[0025] Step 5: A handle 19 is fixedly installed at the top of the arc-shaped groove 14 at an angle, wherein: The handle 19 is a rigid hand-operated component. Its axis is at a preset angle to the plane of the arc groove 14, which makes it easy for the operator to manually adjust the initial position of the swing arm 11 or perform emergency reset when the equipment is not in operation. The handle 19 is fixedly connected to the top of the arc groove 14 to ensure that its movement state is completely consistent with that of the swing arm 11.

[0026] Example 2: See Figure 1-5 In one optional embodiment, this application further provides a base 4 as an installation platform supporting the entire structure. Wherein: The base 4 refers to the overall rigid support component used to support and fix the negative pressure telescopic device 3, the second swing component 2 and the first swing component 1. It is usually used as a reference mounting surface in the structure of medical devices and has sufficient structural strength and dimensional stability.

[0027] In this embodiment, the base 4 is fixed to the main frame of the CT positioning head clamp by bolt connection or welding, providing a symmetrical, inclined and spatially defined installation reference for the two negative pressure telescopic devices 3, so that the telescopic movement directions of the two are consistent and do not interfere with each other. At the same time, the mounting surfaces on the left and right sides of the base 4 respectively constrain the spatial posture of the negative pressure telescopic device 3, ensuring that the relative geometric relationship between the bearing 31, positioning rod 32 and limiting rod 33 driven by its telescopic end is constant in space, thereby ensuring the accuracy of the motion trajectory of the first swing component 1 with the positioning rod 32 as the rotation center.

[0028] This application uses the base 4 as a unified installation platform, which solidifies the spatial assembly relationship of each component, thereby ensuring the matching accuracy of the positioning rod 32 and the positioning hole 12, the consistency of the sliding guidance of the limiting rod 33 and the arc-shaped sliding hole 13, and the rolling contact stability of the bearing 31 and the arc-shaped groove 14. On this basis, the rotation of the first swing component 1 can be accurately transmitted to the second swing component 2, so as to realize the adaptive fit of the pad 22 to the curved surface of the patient's head and the uniform distribution of pressure.

[0029] Example 3: In one alternative embodiment, such as Figure 1-5 As shown, this application also provides a positioning hole 12 sleeved on the positioning rod 32 to limit radial displacement and fix the swing center, and a limiting rod 33 inserted into the arc-shaped sliding hole 13 to slide and control the swing angle of the swing arm 11.

[0030] Step 1: The positioning hole 12 is fitted onto the positioning rod 32 to limit radial displacement and fix the swing center, wherein: The positioning hole 12 is a through hole structure opened on the front of the swing arm 11. Its diameter is slightly larger than the outer diameter of the positioning rod 32, allowing the two to form a clearance fit. The positioning rod 32 is a rigid cylindrical protrusion fixedly installed on the inner wall of the front side of the top opening of the negative pressure telescopic device 3. Its axis is perpendicular to the plane where the base 4 is located and extends in the front-back direction. In the relevant technical field, the positioning rod, as a rotation fulcrum structure, is usually used to constrain the translational degree of freedom of moving parts and establish the position of the rotation center.

[0031] In this embodiment, the positioning hole 12 is sleeved on the outside of the positioning rod 32, so that the swing arm 11 rotates around the axis of the positioning rod 32 as the geometric center. This fit directly constrains the radial displacement of the swing arm 11 in the horizontal plane, preventing it from eccentric shaking or axial movement during the swing process.

[0032] In one alternative implementation, the fitting method may be: pushing the swing arm 11 in the front-back direction, so that the positioning hole 12 is aligned with and slides through the positioning rod 32, until the positioning rod 32 completely penetrates the positioning hole 12.

[0033] In another alternative implementation, the fitting method includes: guiding the positioning hole 12 and the positioning rod 32 to automatically align during the assembly process via a guide ramp, and then applying axial pressure to complete the engagement.

[0034] Furthermore, the fitting method can also employ an elastic pre-tightening structure, with an annular elastic flange provided on the inner wall of the positioning hole 12, so that it generates a radial clamping force after the positioning rod 32 is fitted in, thereby improving vibration resistance stability.

[0035] Step 2: The limiting rod 33 slides within the arc-shaped sliding hole 13 to control the swing angle of the swing arm 11. The limiting rod 33 is a rigid cylindrical protrusion fixedly installed on the inner wall of the rear side of the top opening of the negative pressure telescopic device 3. Its axis is parallel to the positioning rod 32 and is located behind the positioning rod 32. The arc-shaped sliding hole 13 is a long strip through groove opened on the front of the swing arm 11. Its outline is an arc segment with the axis of the positioning rod 32 as the center. The radius of curvature is consistent with the trajectory of the swing arm 11 rotating around the positioning rod 32.

[0036] In this embodiment, the limiting rod 33 is embedded inside the arc-shaped sliding hole 13. During the rotation of the swing arm 11 around the positioning rod 32, the limiting rod 33 slides along the arc trajectory of the arc-shaped sliding hole 13, and its two ends contact the starting end and the ending end of the arc-shaped sliding hole 13 respectively, thereby physically limiting the maximum rotation angle of the swing arm 11 and preventing the clamping wall 21 from being over-closed due to excessive stroke of the negative pressure telescopic device 3, which could compress the patient's head or cause structural interference.

[0037] In one alternative implementation, the sliding fit method can be: the surface of the limit rod 33 is polished, and the inner wall of the arc-shaped sliding hole 13 is provided with a low-friction coating, so that the two maintain smooth movement and uniform resistance when sliding relative to each other.

[0038] In another alternative implementation, the sliding fit method includes: setting elastic buffer pads at both ends of the arc-shaped sliding hole 13 to provide a flexible limiting response when the limiting rod 33 slides to the end, reducing impact noise. Furthermore, the sliding fit method can also adopt an adjustable limiting structure, with a fine-tuning nut set at the root of the limiting rod 33. By screwing it in / out, its axial extension can be changed, thereby fine-tuning the effective sliding length of the arc-shaped sliding hole 13 to adapt to the head positioning needs of patients of different body types.

[0039] This application establishes the rotation center of the swing arm 11 and suppresses radial offset by fitting the positioning hole 12 and the positioning rod 32 together. At the same time, the movement of the swing arm 11 is strictly constrained within the preset arc trajectory by the sliding fit of the limiting rod 33 and the arc-shaped sliding hole 13. The two work together to ensure that each swing of the swing arm 11 has a definite rotation center, a controllable movement path and a precise angular displacement boundary. On this basis, the subsequent rotational action transmitted from the rotating sleeve 15 to the second swing assembly 2 has a high degree of consistency and reproducibility, thereby ensuring that the clamping walls 21 on both sides move towards the patient's head synchronously, with equal amplitude and stability, and finally achieve safe, comfortable and accurate CT positioning clamping.

[0040] Example 4: In one alternative embodiment, such as Figure 3 As shown, this application also provides a second swing assembly including a clamping wall, a connecting circular groove is provided on the rear side of the clamping wall, a threaded hole post is fixedly installed inside the connecting circular groove, a limit bolt is provided in the threaded hole post, the top of the limit bolt is located in the mounting hole and cooperates with the top of the rotating sleeve, a limit groove is provided on the inner circumferential wall of the connecting circular groove, and the limit groove cooperates with the limit block.

[0041] Step 1: The second swing assembly 2 includes a clamping wall 21, and a connecting groove 23 is provided on the rear side of the clamping wall 21, wherein: The connecting groove 23 is a through groove structure formed by an annular recess along the rear central axis of the clamping wall 21. Its geometric center coincides with the theoretical center of rotation of the clamping wall 21 around the vertical axis. In the field of medical device structures, the connecting groove is used to provide a rotational mating interface, enabling the connected components to rotate relatively freely around the vertical axis. In this embodiment, the connecting groove 23 and the rotating sleeve 15 on the first swing assembly 1 form a coaxial nested rotational mating relationship, allowing the clamping wall 21 to rotate synchronously around the vertical axis with the outer circular surface of the rotating sleeve 15 as the rotation reference plane, driven by the swing arm 11. This transforms the rotational motion of the swing arm into an adaptive fitting action of the clamping wall to the curved surface of the patient's head. The rotating sleeve 15 has been defined and explained in Embodiment 1. It is only referred to here as a known structure and its composition or function will not be explained again.

[0042] Step 2: A threaded post 24 is fixedly installed inside the connecting groove 23. A limit bolt 25 is provided inside the threaded post 24. The top of the limit bolt 25 is located inside the mounting hole 17 and cooperates with the top of the rotating sleeve 15. The threaded post 24 is a hollow cylindrical structure with one end open and a standard internal thread. Its outer wall is fixed to the center of the bottom surface of the connecting groove 23 by interference fit or fastening adhesive. In the field of mechanical connection technology, the threaded post is used to provide detachable axial limiting and preload adjustment functions. In this embodiment, the threaded post 24 serves as the mounting carrier for the limiting bolt 25, so that the limiting bolt 25 can achieve axial contact and fine-tuning positioning of the top of the rotating sleeve 15 without damaging the overall structure of the clamping wall 21.

[0043] The limiting bolt 25 is a standard fastener with external threads. Its threaded section is screwed into the threaded hole post 24, and the smooth section and bolt head extend into the mounting hole 17. In the field of mechanical assembly technology, the limiting bolt is used to provide a controllable axial constraint force while allowing the constrained part to maintain free movement in the radial and circumferential directions.

[0044] In one alternative implementation, the installation method of the limiting bolt 25 is as follows: first, place the clamping wall 21 with the rear side facing upward, embed the threaded hole post 24 into the preset positioning groove at the bottom of the connecting circular groove 23 and cure it, then screw the limiting bolt 25 into the threaded hole post 24 from the rear side of the clamping wall 21 until the top of the bolt extends into the mounting hole 17 and forms a non-contact spatial constraint with the top of the rotating sleeve 15.

[0045] In another alternative implementation, the installation method of the limiting bolt 25 may include: after the clamping wall 21 and the first swing assembly 1 are initially assembled, the limiting bolt 25 is inserted from the front through the mounting hole 17, and its tail is operated through the mounting hole 17 with the help of a long-handled Allen wrench to screw it into the threaded hole post 24 pre-installed in the connecting circular groove 23, so as to realize the on-site adjustment of the axial limiting state. Furthermore, the limiting bolt 25 can also be installed with a locking washer or a double nut anti-loosening structure to enhance its axial stability in the vibration environment of CT equipment, while still maintaining the rotational freedom of the rotating sleeve 15.

[0046] Step 3: A limiting groove 26 is formed on the inner circumference of the connecting circular groove 23. The limiting groove 26 cooperates with the limiting block 16, wherein: The limiting groove 26 is an arc-shaped through groove opened along the circumferential direction of the inner wall of the connecting circular groove 23. Its starting end and ending end correspond to the maximum clockwise and counterclockwise rotation boundaries allowed by the clamping wall 21, respectively. In the field of mechanical limiting technology, the limiting groove is used to limit the angular displacement range of the rotating component and prevent overtravel from causing structural interference or functional failure. In this embodiment, the limiting groove 26 and the limiting block 16 on the first swing assembly 1 form a dual cooperation relationship of sliding guide and stroke stop. When the swing arm 11 drives the rotating sleeve 15 to rotate, the limiting block 16 rotates synchronously with the rotating sleeve 15 and slides along the inner wall of the limiting groove 26 until it abuts the end of the limiting groove 26, thereby physically limiting the rotation angle of the clamping wall 21 relative to the swing arm 11. The limiting block 16 has been defined and explained in Embodiment 1. Here, it is only naturally referenced as a known structure, and its composition or function will not be explained again.

[0047] By connecting the circular groove 23 and the rotating sleeve 15 in a coaxial nesting fit, the clamping wall 21 is able to rotate freely around the vertical axis, thereby responding to the rotation of the swing arm 11 and achieving spatial adaptation to the curvature of the patient's head. With the help of the sliding constraint of the limiting block 16 in the limiting groove 26, the maximum rotation angle of the clamping wall 21 is accurately controlled to avoid patient discomfort or structural collision caused by excessive contraction. Combined with the detachable axial limiting mechanism composed of the limiting bolt 25 and the threaded hole post 24, while ensuring the rotational freedom of the clamping wall 21, it ensures reliable assembly stability and maintenance accessibility between it and the first swing assembly 1.

[0048] Example 5: In an optional embodiment, the present application also provides that two rubber pads 22 are detachably mounted on the inner side of the clamping wall 21.

[0049] Step 1: Two rubber pads 22 are detachably installed on the inner side of the clamping wall 21.

[0050] The adhesive pad 22 possesses compressibility, resilience, and surface friction adaptability in the relevant technical field. It can respond to local contact pressure changes through its own deformation and restore its initial contour after the external force is removed. In this embodiment, the adhesive pad 22 is directly fixed to the inner side of the clamping wall 21 facing the patient's head. Its installation position is symmetrically distributed on both sides of the longitudinal center line of the clamping wall 21, so that the adhesive pads 22 on both sides simultaneously contact the patient's temporal region during clamping. The deformation state of the adhesive pad 22 is directly driven by the normal force applied by the rotation and retraction action of the clamping wall 21, and the contact area and pressure distribution with the curved surface of the head are dynamically adjusted accordingly.

[0051] In one alternative implementation, the detachable installation method may be: the back of the rubber pad 22 is provided with a buckle structure, and a matching slot is opened at the corresponding position on the inner side of the clamping wall 21, so as to achieve mechanical quick installation and quick removal by pressing and embedding.

[0052] In another alternative implementation, the detachable installation method may be: the back of the pad 22 is provided with a magnetic layer, and the inner side of the clamping wall 21 is embedded with a permanent magnet or a magnetically conductive metal sheet of corresponding polarity, so as to achieve positioning and fixation through magnetic attraction.

[0053] Furthermore, the detachable installation method can also be as follows: the edge of the rubber pad 22 is provided with an annular flange, and the inner side of the clamping wall 21 is provided with an annular groove with an elastic pressing edge. By radial extrusion, the flange is inserted into the groove to complete the locking. When disassembling, a pulling force is applied along the axial direction to disassemble it.

[0054] By symmetrically arranging two removable rubber pads 22 on the inner side of the clamping wall 21, their elastic deformation ability adaptively fills the microscopic gap between the clamping wall 21 and the patient's head, transforming the contact pressure from a concentrated point / line load to a distributed surface load. Furthermore, the removable structure of the rubber pads 22 allows them to be cleaned, sterilized, or replaced independently of the clamping wall 21, avoiding cross-contamination and ensuring the long-term mechanical stability and reusability of the main structure of the clamping wall 21.

[0055] Example 6: In an optional embodiment, the present application also provides that the limiting bolt 25 passes through the mounting hole 17 and is screwed into the threaded hole post 24, and a gap is left between the limiting bolt 25 and the top of the rotating sleeve 15.

[0056] Step 1: The limiting bolt 25 passes through the mounting hole 17 and is screwed into the threaded post 24, with a gap between the limiting bolt 25 and the top of the rotating sleeve 15. Wherein: The limiting bolt 25 is a standard fastener with an external thread structure, used to apply a controllable constraint force to the second swing assembly 2 in the axial direction. In the field of mechanical connection, it has the functions of providing adjustable preload, axial positioning and anti-loosening. In this embodiment, the limiting bolt 25 is inserted from the front end of the mounting hole 17, passes through the internal space of the mounting hole 17, and is screwed into the threaded hole post 24 in the connecting groove 23 on the rear side of the clamping wall 21, thereby pressing the second swing assembly 2 axially against the front of the first swing assembly 1 to form a stable but non-rigidly locked assembly relationship.

[0057] Mounting hole 17 is a through hole structure opened on the front of the first swing assembly 1. Its hole diameter is larger than that of the rotating sleeve 15, forming an axial channel to accommodate the head of the limiting bolt 25 and the screw section. In the field of mechanical assembly, this structure is usually used to avoid fasteners and reserve adjustment space. In this embodiment, mounting hole 17 not only provides an assembly path for the limiting bolt 25, but also ensures that the limiting bolt 25 does not interfere with the rotating sleeve 15 during the screwing process through its redundant hole diameter design.

[0058] The threaded post 24 is a hollow cylindrical threaded insert that is fixedly installed inside the connecting circular groove 23. Its inner wall is provided with internal threads that match the limiting bolt 25. This structure is often used in mechanical structures to enhance the local thread strength and improve the reliability of repeated assembly and disassembly. In this embodiment, the threaded post 24 serves as the force fulcrum of the limiting bolt 25, transmitting the axial clamping force to the clamping wall 21 body, and working together with the limiting block 16 and the limiting groove 26 to constrain the rotational degree of freedom of the second swing assembly 2.

[0059] The rotating sleeve 15 is an annular rotating support structure fixed to the front of the arc groove 14. Its axis coincides with the rotation center of the clamping wall 21 around the vertical axis. In the field of rotary transmission, this structure is usually used to bear rotational motion, transmit torque and guide axial positioning. In this embodiment, the rotating sleeve 15 serves as the rotational coupling interface between the first swing assembly 1 and the second swing assembly 2. Its top end face does not participate in axial pressure bearing, but only undertakes the radial support and rotational guidance functions from the clamping wall 21.

[0060] The clearance refers to the axial distance between the end face of the limiting bolt 25 and the top end face of the rotating sleeve 15 after the limiting bolt 25 is tightened to the end. This clearance is not a functional clearance in the tolerance fit, but a structural redundancy designed actively. In this embodiment, the clearance ensures that even if the limiting bolt 25 is fully tightened, its end will not contact or press the top end face of the rotating sleeve 15, thereby avoiding any axial constraint or frictional resistance to the free rotation of the rotating sleeve 15.

[0061] This application achieves axial positioning of the second swing assembly 2 by screwing the limiting bolt 25 into the threaded hole 24. The redundant diameter of the mounting hole 17 ensures assembly feasibility. Relying on the gap between the end of the limiting bolt 25 and the top of the rotating sleeve 15, the rotating sleeve 15 maintains uninterrupted rotational freedom while being axially constrained. On this basis, when the swing arm 11 is driven to rotate by the bearing 31, the rotating sleeve 15 can smoothly drive the clamping wall 21 to rotate synchronously around the vertical axis. The limiting block 16 slides in the limiting groove 26, ultimately achieving adaptive fit of the rubber pad 22 to the curved surface of the patient's head. This gap design maintains the stability of the structural assembly while effectively avoiding rotational jamming, abnormal wear, or transmission lag caused by excessive axial constraint, thus improving the response consistency and long-term reliability of the swing arm structure during CT positioning.

[0062] Example 7: In one alternative embodiment, such as Figure 1-5 As shown, this application also provides a bearing 31 that rolls along the curved surface of the arcuate groove 14 to convert the vertical thrust of the negative pressure telescopic device 3 into the rotational force of the swing arm 11, including: Step 1: The bearing 31 rolls along the curved surface of the arc groove 14 to convert the vertical thrust of the negative pressure telescopic device 3 into the rotational force of the swing arm 11, wherein: Bearing 31 is a commonly used slewing bearing element in the field of mechanical transmission. Its function is to provide low-friction rolling contact between relatively moving parts. In this embodiment, bearing 31 is installed on the top of the telescopic end of the negative pressure telescopic device 3. Its outer ring and the inner wall of the arc groove 14 form a rolling pair, which is the key contact interface for realizing force transmission and motion conversion in this structure.

[0063] The arc groove 14 is a concave slide with a constant radius of curvature opened at the bottom of the swing arm 11 along a preset rotation trajectory. The center of its curved surface coincides with the geometric center of the positioning hole 12, that is, it is consistent with the rotation axis determined by the positioning rod 32. This structure makes the rolling path of the bearing 31 strictly constrained to the arc trajectory with the positioning rod 32 as the center.

[0064] Vertical thrust refers to the linear force applied to the bearing 31 along its own axis during the driving process of the negative pressure telescopic device 3. Its direction is basically perpendicular to the plane where the base 4 is located. This force comes from the piston rod extension action driven by the air pressure difference inside the negative pressure cavity.

[0065] The rotational force is not an independently applied torque, but rather refers to the vertical thrust decomposed into a tangential component at the local contact point of the swing arm 11 during the rolling contact process between the bearing 31 and the arc groove 14, because the normal direction of the arc groove 14 surface changes continuously with the position. This tangential component forms a torque on the positioning rod 32, thereby driving the swing arm 11 to rotate around the positioning rod 32.

[0066] In one alternative implementation, the rolling conversion method is as follows: through continuous rolling contact between the bearing 31 and the arc groove 14, during the extension of the negative pressure telescopic device 3, the bearing 31 moves from the low position to the high position along the curved surface of the arc groove 14, and its contact point continues to deflect in the normal direction, thereby automatically decomposing the input axial thrust into a radial component pointing towards the center of rotation and a tangential component perpendicular to the radius, and the tangential component generates an effective rotational torque.

[0067] In another alternative implementation, the rolling conversion method includes: based on the relationship between the radius of curvature of the arc groove 14 and the distance between the positioning rod 32 and the contact point of the bearing 31, the bearing 31 maintains a non-collinear force on the swing arm 11 during the rolling process, thereby avoiding force system balance and ensuring that the net torque continues to exist.

[0068] Furthermore, the rolling conversion method can also employ a pre-tight fit or surface micro-textured structure between the bearing 31 and the arc groove 14 to enhance contact stability and force transmission efficiency during the rolling process, and prevent rotational response delay caused by slippage or instantaneous loss of load.

[0069] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A swing arm structure for a CT positioning head clamp, characterized in that, include: The base (4), two first swing assemblies (1), two second swing assemblies (2), and two negative pressure telescopic devices (3); The negative pressure telescopic device (3) is fixed obliquely and symmetrically on the left and right sides of the base (4), the second swing component (2) is rotatably installed on the corresponding negative pressure telescopic device (3), and the first swing component (1) is rotatably installed on the front of the corresponding second swing component (2). The negative pressure telescopic device (3) has a bearing (31) rotatably installed at its telescopic end. The top of the negative pressure telescopic device (3) is an opening. The front and rear inner walls of the opening are fixedly installed with a positioning rod (32) and a limiting rod (33). The bearing (31), positioning rod (32), and limiting rod (33) are all in cooperation with the first swing assembly (1). The first swing assembly (1) includes a swing arm (11), the front of the swing arm (11) is provided with a positioning hole (12) and an arc-shaped sliding hole (13), the bottom of the swing arm (11) is provided with an arc-shaped groove (14), the positioning hole (12) cooperates with the positioning rod (32), the arc-shaped sliding hole (13) cooperates with the limiting rod (33), and the arc-shaped groove (14) cooperates with the bearing (31); A rotating sleeve (15) is fixedly installed on the front of the arc-shaped groove (14), and a limiting block (16) is fixedly installed on the periphery of the rotating sleeve (15). A mounting hole (17) is opened on the front of the first swing assembly (1). The mounting hole (17) is connected to the rotating sleeve (15), and the diameter of the mounting hole (17) is larger than the diameter of the rotating sleeve (15). A sealing cover (18) is snapped into the inside of the mounting hole (17). A handle (19) is fixedly installed at the top of the arc-shaped groove (14) at an angle. The bearing (31) rolls along the curved surface of the arc groove (14), converting the vertical thrust of the negative pressure telescopic device (3) into the rotational force of the swing arm (11). The arc groove (14) is a concave slide with a constant radius of curvature opened at the bottom of the swing arm (11) along a preset rotation trajectory. The concave slide strictly constrains the rolling path of the bearing (31) to an arc trajectory centered on the positioning rod (32).

2. The swing arm structure for CT positioning head clamp according to claim 1, characterized in that, The base (4) is an installation platform that supports the entire structure and is used to carry and fix the negative pressure telescopic device (3), the second swing assembly (2) and the first swing assembly (1).

3. The swing arm structure for CT positioning head clamp according to claim 1, characterized in that, The positioning hole (12) is fitted onto the positioning rod (32). The positioning hole (12) is a through hole structure opened on the front of the swing arm (11). Its diameter is slightly larger than the outer diameter of the positioning rod (32). It is used to limit radial displacement and fix the swing center.

4. The swing arm structure for CT positioning head clamp according to claim 1, characterized in that, The limiting rod (33) slides within the arc-shaped sliding hole (13). The arc-shaped sliding hole (13) is a long strip-shaped through groove opened on the front of the swing arm (11). Its outline is an arc segment with the axis of the positioning rod (32) as the center, used to control the swing angle of the swing arm (11).

5. The swing arm structure for CT positioning head clamp according to claim 1, characterized in that, The second swing assembly (2) includes a clamping wall (21), a connecting circular groove (23) is provided on the rear side of the clamping wall (21), a threaded hole post (24) is fixedly installed inside the connecting circular groove (23), a limit bolt (25) is provided inside the threaded hole post (24), and a limit groove (26) is provided on the inner circumference of the connecting circular groove (23), the limit groove (26) cooperates with the limit block (16).

6. The swing arm structure for CT positioning head clamp according to claim 5, characterized in that, The inner side of the clamping wall (21) is detachably fitted with two rubber pads (22). The rubber pads (22) are flexible buffer structures made of medical grade elastomer material and are symmetrically distributed on both sides of the longitudinal center line of the clamping wall (21).

7. The swing arm structure for CT positioning head clamp according to claim 5, characterized in that, The limiting bolt (25) passes through the mounting hole (17) and is screwed into the threaded hole post (24), and the top of the limiting bolt (25) is located inside the mounting hole (17), leaving a gap between it and the top of the rotating sleeve (15).

8. The swing arm structure for CT positioning head clamp according to claim 5, characterized in that, The connecting groove (23) and the rotating sleeve (15) form a coaxial nested rotational fit relationship, and the limiting block (16) and the limiting groove (26) cooperate to limit the maximum rotation angle of the clamping wall (21).

9. The swing arm structure for a CT positioning head clamp according to claim 5, characterized in that, The sealing cover (18) is an elastic snap-on type cover that can be detachably snapped into the mounting hole (17) to seal the internal space and prevent dust and body fluids from entering the mating area of ​​the rotating sleeve (15) and the connecting groove (23).

Images