Movable CT image examination external fixator and fixing method

Abstract

The invention relates to the technical field of CT image examination external fixators, in particular to a movable CT image examination external fixator, which comprises a bed body, a fixing device, a first fixing device, a second fixing device, a third fixing device, a fourth fixing device and a fifth fixing device, and is characterized in that a patient can lie on the bed body and can be moved into a CT; the head fixing assembly is arranged above the bed body and can reciprocate in the length direction of the bed body; the sliding rails are fixed to the two sides of the bottom of the bed body and are in sliding fit with the head fixing assembly. The body fixing assembly is arranged above the bed body, can reciprocate in the length direction of the bed body and is in sliding fit with the sliding rail; the head fixing assembly comprises movable frames distributed on the two side faces of the bed body. The side face clamping air bag is arranged to clamp the head of a patient, the side face clamping air bag can adapt to the shape of the head of the patient, the material is soft, discomfort is not likely to be brought to the patient, and the height of the head of the patient can be adjusted through the function of the height adjusting air bag.

Description

Technical Field

[0001] This invention relates to the field of external fixation devices for CT imaging examinations, specifically a movable external fixation device for CT imaging examinations and a fixation method thereof. Background Technology

[0002] In the medical field, CT imaging is an important diagnostic tool widely used in the detection of various diseases. Generally, the headrest used for CT and MRI patients when lying down is in a fixed position. If there is a discrepancy in the head position after the patient lies down, the patient needs to be moved again, which is inconvenient for some patients with limited mobility. Furthermore, some patients with cerebrovascular diseases may become agitated during CT or MRI examinations, and their heads may unconsciously sway. If family members forcibly fix the patient's head, artifacts may occur. Therefore, a new head fixation structure for CT and MRI is proposed.

[0003] Chinese patent CN213758296U discloses an external fixator for cranial CT scans, including a support mechanism and three adjustment mechanisms. The support mechanism and the three adjustment mechanisms are made of transparent silicone. The support mechanism contains vertical supports arranged in a mirror-symmetrical manner, and a headband ring is set in the middle of the two vertical supports. A neck support ring is fixedly installed at the lower end of the outer wall of the headband ring, and a head top block is set inside the headband ring. Mounting brackets are fixedly installed at the lower ends of the two sets of vertical supports, and fastening screws are set inside the two mounting brackets. This patent fixes the patient's head by fixing the fixator to the bed and fixing the sides of the patient's head with two arc-shaped frames.

[0004] The existing technology fixes the device to the examination table and uses two curved frames to restrain the patient's head on both sides. However, this fixation method has significant drawbacks. Firstly, the curved frames are fixed to the patient's head by rotating bolts, making it difficult to precisely control the fixing force. Insufficient force fails to effectively fix the head, allowing it to still move; excessive force causes significant discomfort and may even cause pressure injury to the head. Secondly, the curved frames are in direct contact with the patient's head, and their material, shape, and contact method may not meet the comfort needs of different patients, easily causing discomfort and further exacerbating their tension and anxiety, hindering the smooth progress of the examination. More importantly, each patient's physical condition and examination needs are different. Existing head fixation structures cannot flexibly adjust the patient's head height according to their actual situation. For some patients with cervical spine diseases, a specific head height may be required to support the cervical spine and reduce discomfort and injury during the examination. Summary of the Invention

[0005] The purpose of this invention is to provide a movable external fixator and fixation method for CT imaging examination. The device uses a side clamping airbag to clamp the patient's head. The side clamping airbag can adapt to the shape of the patient's head, and the material is soft and does not cause discomfort to the patient. Furthermore, the height of the patient's head can be adjusted by the height-adjustable airbag.

[0006] To address the problems of existing technologies, this invention provides a movable external fixator for CT imaging examinations, comprising: a bed for placing a patient on and moving the patient into the CT scanner; a head fixation assembly disposed above the bed and capable of reciprocating along the length of the bed; slide rails fixed to both sides of the bottom of the bed and slidably engaging with the head fixation assembly; and a body fixation assembly disposed above the bed and capable of reciprocating along the length of the bed, and slidably engaging with the slide rails. The head fixation assembly includes movable frames distributed on both sides of the bed, and further includes a movable frame capable of reciprocating along the length of the bed. The head fixation mechanism reciprocates in the width direction of the bed. The slide rail also includes a moving drive mechanism for driving the head fixation mechanism to reciprocate between two moving frames. The head fixation mechanism includes a support ring. On both sides of the support ring, there are clamping components for fixing the patient's head and a head support member for supporting the patient's head at the bottom of the support ring. The clamping components include two clamping blocks for clamping the sides of the patient's head. The clamping part of the clamping block is also provided with an inflatable side clamping airbag. The head support member is also provided with an inflatable height-adjustable airbag.

[0007] Preferably, the clamping assembly further includes a connecting block disposed on the support ring, and an adjusting screw is rotatably disposed on the connecting block via a thread. The clamping assembly further includes a pressure detection device disposed between the connecting block and the clamping block for detecting the pressure applied to the patient's head by the side clamping airbag.

[0008] Preferably, the head fixing mechanism further includes an inflation assembly for inflating gas into the two side clamping airbags and the height adjusting airbag, and the side clamping airbags and the height adjusting airbag are also provided with deflation valves for deflating.

[0009] Preferably, the inflation assembly further includes connecting pipes that are respectively connected to the two side clamping airbags and the height adjusting airbag, and the connecting pipes are also provided with control valves that can independently control the gas entering the two side clamping airbags and the height adjusting airbag. The inflation assembly is also provided with an air pump connected to the head limiting mechanism for inflating the gas into the side clamping airbags and the height adjusting airbag.

[0010] Preferably, the connecting block in the clamping assembly is also rotatably provided with a chin limiting component that can be used to support the patient's chin.

[0011] Preferably, the chin limiting component includes two adjusting members rotatably mounted on the connecting block. Each adjusting member is further provided with an adjusting frame that can slide within the adjusting member. The adjusting frame is arc-shaped, and a pad that can contact the patient's chin is also slidably mounted on the adjusting frame.

[0012] Preferably, the chin limiting component further includes a second spring disposed inside the adjusting member and giving the adjusting frame a resetting tendency, one end of the second spring being connected to the adjusting frame and the other end of the second spring being connected to the interior of the adjusting member.

[0013] Preferably, the moving drive mechanism includes a lead screw rotatably disposed between the moving frames and capable of reciprocating the head fixing mechanism, and a guide rod for guiding the support ring. One end of the lead screw is connected to a rotating handle. The support ring is also connected to a sliding sleeve that slides with the guide rod. The support ring is also provided with a threaded sleeve that is threadedly connected to the lead screw. A sleeve is also connected to the threaded sleeve. The bottom of the moving frame is also provided with a first slider that slides with the slide rail. A first fixing screw is rotatably disposed on the first slider. One end of the first fixing screw is also connected to a first pressure block that can press against the slide rail.

[0014] Preferably, the head fixing mechanism further includes a head limiting mechanism, which includes a slide rod slidably disposed in the sleeve. A head top block is also provided at the end of the slide rod away from the sleeve. A first spring is sleeved on the slide rod, with one end of the first spring connected to the head top block and the other end of the first spring connected to the sleeve.

[0015] A method for fixing a movable external fixator for CT imaging examinations, comprising the movable external fixator for CT imaging examinations described above, including the following steps:

[0016] S1: The patient lies on the bed. According to the position of the patient's head, the moving frame is moved to move the head fixation component to the position of the patient's head. Then, by rotating the first fixing screw, the first fixing screw makes the first pressure block press on the slide rail. By rotating the rotating handle, the screw is rotated, and the support ring is moved to the position of the patient's head.

[0017] S2: Place the patient's head on the height-adjusting airbag, then open the control valve on the connecting tube connected to the height-adjusting airbag and close the control valves connected to the two side clamping airbags at the same time. Operate the air pump to introduce air into the height-adjusting airbag to adjust the height. Stop inflating when the patient's head reaches the appropriate height.

[0018] S3: By rotating the adjusting screw, the clamping block is brought closer to the patient's head. By closing the control valve connected to the height adjusting airbag and opening the control valve connected to the side clamping airbag, the air is introduced into the side clamping airbag by operating the air pump. The side clamping airbag fixes the patient's head, and the pressure detection device detects the pressure to avoid excessive clamping force and causing discomfort to the patient.

[0019] S4: By rotating the adjustment frame, the pad is placed against the patient's chin, and the head is further fixed by the action of the head block and the pad.

[0020] S5: The patient's body is immobilized through the action of the body fixation components.

[0021] The advantages of this invention application compared to the prior art are:

[0022] This application's external fixator features an arc-shaped clamping block, which is moved closer to the patient's head by rotating an adjusting screw. This lays the foundation for precise fixation. After the clamping block approaches the patient's head, a collaborative mechanism between an inflation component and a side clamping airbag is introduced. By continuously pressing the inflation component, gas is inflated into the side clamping airbag. The side clamping airbag is made of a soft material with good flexibility and adaptability, automatically adjusting its shape according to different head shapes of the patients, closely conforming to the head contour, effectively avoiding the risk of scratches that may be caused by direct rigid contact between traditional fixation devices and the head. More importantly, this application incorporates a pressure detection device on the clamping block. Since forces are reciprocal, a reaction force is generated when the side clamping airbag contacts the patient's head, and the pressure detection device can detect the magnitude of this reaction force. This effectively avoids excessive clamping force that may cause discomfort to the patient, ensuring the comfort and safety of head fixation. In addition, this application incorporates a height-adjustable airbag on the head support component. By introducing gas into the height-adjustable airbag, the patient's head height can be flexibly adjusted according to their actual needs. This design fully considers the individual differences of different patients. For example, patients with cervical spondylosis require a specific head height to maintain cervical spine position. To ensure the independent operation of the side clamping airbag and the height-adjustable airbag, this application includes a control valve. Through the regulation of the control valve, the gas entering the two airbags is relatively independent and does not interfere with each other, ensuring the stability and reliability of the head fixation and height adjustment functions. Simultaneously, this application also includes an auxiliary clamping structure composed of a head block and an adjustment frame. A sliding rod at one end of the head block is slidably connected to a sleeve, and a first spring provides elasticity to the head block; the adjustment frame can slide within the adjustment mechanism, and a second spring provides tension to the adjustment frame, which also has pads. Through the synergistic action of the head block and the pads, auxiliary clamping of the patient's head is achieved. Unlike the traditional method of using bolts to move the head block, this application utilizes the elasticity of springs to automatically adjust the clamping force according to the pressure on the head, avoiding discomfort to the patient due to excessive clamping force, and further improving the comfort and safety of head fixation. Attached Figure Description

[0023] Figure 1 This is a first three-dimensional structural schematic diagram of a movable external fixator for CT imaging examination according to the present invention.

[0024] Figure 2 This is a schematic diagram of the second three-dimensional structure of a movable external fixator for CT imaging examination according to the present invention.

[0025] Figure 3 This is a first three-dimensional structural diagram of the head fixation component of a movable CT imaging external fixator according to this invention application.

[0026] Figure 4This is a schematic diagram of the second three-dimensional structure of the head fixation component of a movable CT imaging external fixator according to this invention application.

[0027] Figure 5 This is a first three-dimensional structural diagram of the head fixation mechanism of a movable CT imaging external fixator according to the present invention.

[0028] Figure 6 This is a schematic diagram of the second three-dimensional structure of the head fixation mechanism of a movable CT imaging external fixator according to this invention application.

[0029] Figure 7 This is a three-dimensional structural diagram of the moving drive mechanism of a movable CT imaging external fixator according to the present invention.

[0030] Figure 8 This is a three-dimensional structural diagram of the body fixation component of the movable drive mechanism of a movable CT imaging external fixator according to this invention application.

[0031] The following components are labeled in the diagram: 1. Bed frame; 2. Head fixing assembly; 21. Moving frame; 22. First slider; 221. First fixing screw; 222. First pressure block; 23. Moving drive mechanism; 231. Lead screw; 232. Guide rod; 233. Rotating handle; 24. Head fixing mechanism; 241. Support ring; 2411. Sliding sleeve; 2412. Threaded sleeve; 24121. Sleeve; 242. Head limiting mechanism; 2421. Head top block; 2422. Sliding rod; 2423. First spring; 243. Chin limiting assembly; 2431. Adjusting component; 2432. Adjusting frame. 2433, Pad; 2434, Second Spring; 244, Clamping Assembly; 2441, Connecting Block; 2442, Adjusting Screw; 2443, Clamping Block; 2444, Pressure Detection Device; 245, Side Clamping Airbag; 246, Height Adjusting Airbag; 247, Inflation Assembly; 2471, Air Pump; 2472, Connecting Pipe; 2473, Control Valve; 248, Head Support; 3, Slide Rail; 4, Body Fixing Assembly; 41, Flexible Fixing Pad; 411, Elastic Strap; 412, Hook; 42, Second Slider; 421, Second Fixing Screw; 422, Second Pressure Block. Detailed Implementation

[0032] To further understand the features, technical means, and specific objectives and functions achieved by this invention application, the invention application will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1-8As shown, this invention application provides a movable external fixator for CT imaging examination, comprising: a bed 1 for placing a patient on it and moving the patient to the CT scanner; a head fixation assembly 2 disposed above the bed 1 and capable of reciprocating along the length of the bed 1; a slide rail 3 fixed to both sides of the bottom of the bed 1 and slidably engaged with the head fixation assembly 2; and a body fixation assembly 4 disposed above the bed 1 and capable of reciprocating along the length of the bed 1, and slidably engaged with the slide rail 3; the head fixation assembly 2 includes movable frames 21 distributed on both sides of the bed 1, and the head fixation assembly 2 also includes a head fixation device capable of reciprocating along the width of the bed 1. The fixed mechanism 24 and the slide rail 3 also include a moving drive mechanism 23 disposed between the two moving frames 21 for driving the head fixing mechanism 24 to move back and forth. The head fixing mechanism 24 includes a support ring 241. On both sides of the support ring 241, there are clamping components 244 that can fix the patient's head and a head support member 248 disposed at the bottom of the support ring 241 for supporting the patient's head. The clamping components 244 include two clamping blocks 2443 that can clamp the sides of the patient's head. The clamping part of the clamping block 2443 is also provided with an inflatable side clamping airbag 245. The head support member 248 is also provided with an inflatable height adjustment airbag 246.

[0034] The head fixation mechanism 24 is moved along the width of the bed 1 by the moving drive mechanism 23, so that the head fixation mechanism 24 is moved to a suitable position to adapt to the position of the patient's head. At the same time, the head fixation assembly 2 can slide along the length of the bed 1 on the slide rail 3 to further adjust its relative position with the patient's head. According to the specific condition of the patient's head, the height adjustment airbag 246 is inflated, so that the head support 248 rises to a suitable height to effectively support the patient's head. The side clamping airbag 245 is inflated, so that the clamping part of the clamping block 2443 expands and fits tightly against both sides of the patient's head to achieve stable clamping and fixation of the patient's head. The body fixation assembly 4 slides along the length of the bed 1 on the slide rail 3 and is adjusted to a suitable position to fix the patient's body and ensure that the patient's body remains stable during the CT examination. The bed 1 moves the fixed patient into the CT equipment for CT imaging examination. Throughout the examination, the head fixation assembly 2 and the body fixation assembly 4 work together to keep the patient's body and head stable and avoid affecting the examination results due to patient movement.

[0035] The clamping assembly 244 also includes a connecting block 2441 disposed on the support ring 241, and an adjusting screw 2442 is rotatably disposed on the connecting block 2441 via a thread. The clamping assembly 244 also includes a pressure detection device 2444 disposed between the connecting block 2441 and the clamping block 2443 for detecting the pressure applied to the patient's head by the side clamping airbag 245.

[0036] refer to Figures 3-6 As shown, the head-fixing mechanism 24 also includes an inflation assembly 247 for inflating gas into the two side-clamping airbags 245 and the height-adjusting airbag 246. The side-clamping airbags 245 and the height-adjusting airbag 246 are also equipped with deflation valves for releasing gas. The inflation assembly 247 also includes connecting pipes 2472 respectively connected to the two side-clamping airbags 245 and the height-adjusting airbag 246. The connecting pipes 2472 are also equipped with control valves 2473 capable of independently controlling the gas flow into the two side-clamping airbags 245 and the height-adjusting airbag 246. The inflation assembly 247 also includes an air pump 2471 connected to the head-limiting mechanism 242 for inflating gas into the side-clamping airbags 245 and the height-adjusting airbag 246.

[0037] When the height of the head support 248 needs to be adjusted, open the control valve 2473 on the connecting pipe 2472 connected to the height adjustment airbag 246, and simultaneously close the control valve 2473 connected to the two side clamping airbags 245. Then operate the air pump 2471 to inflate the height adjustment airbag 246 through the connecting pipe 2472. The height adjustment airbag 246 inflates, causing the head support 248 to rise. Inflation stops once the appropriate height is reached. When it is necessary to clamp and fix the patient's head on both sides, open the control valve 2473 on the connecting pipe 2472 connected to the two side clamping airbags 245, and close the control valve 2473 connected to the height adjustment airbag 246. Operate the air pump 2471 to inflate the two side clamping airbags 245 through the connecting pipe 2472. The side clamping airbags 245 inflate, and the clamping parts of the clamping blocks 2443 fit against the sides of the patient's head, achieving clamping and fixation. After the examination, the deflation valves on the side clamping airbag 245 and the height adjustment airbag 246 are opened, and the gas in the airbags is gradually released. The side clamping airbag 245 and the height adjustment airbag 246 return to the uninflated state, and the head fixation mechanism 24 releases its fixation on the patient's head, allowing the patient to leave the bed smoothly.

[0038] The clamping assembly 244 also includes a chin-limiting assembly 243 rotatably mounted on the connecting block 2441 for supporting the patient's chin. The chin-limiting assembly 243 includes two adjusting members 2431 rotatably mounted on the connecting block 2441. Each adjusting member 2431 has a sliding adjusting frame 2432, which is arc-shaped and has a slidably mounted pad 2433 that contacts the patient's chin. The chin-limiting assembly 243 also includes a second spring 2434 disposed inside the adjusting members 2431 and providing a return tendency for the adjusting frame 2432. One end of the second spring 2434 is connected to the adjusting frame 2432, and the other end is connected to the interior of the adjusting member 2431.

[0039] When the patient lies on the bed 1 and their head is initially secured by the clamping component 244, the adjusting component 2431 is rotated according to the position and angle of the patient's chin, so that the chin limiting component 243 is roughly aligned with the patient's chin. Then, the adjusting frame 2432 is pushed to slide within the adjusting component 2431, allowing the arc-shaped adjusting frame 2432 to better conform to the contour of the patient's chin. Simultaneously, the sliding pad 2433 is positioned on the adjusting frame 2432 to ensure close contact with the patient's chin, providing stable support. After the position of the chin limiting component 2433 is adjusted, the second spring 2434 generates a certain elastic force to hold the adjusting frame 2432 in its current position, ensuring that the pad 2433 provides stable and reliable support for the patient's chin. Throughout the CT examination, the chin limiting component 243 works in conjunction with other parts of the head fixation mechanism 24 to maintain the stability of the patient's head and prevent head movement from affecting the examination results.

[0040] The moving drive mechanism 23 includes a lead screw 231 rotatably disposed between the moving frames 21 and capable of reciprocating the head fixing mechanism 24, and a guide rod 232 for guiding the support ring 241. One end of the lead screw 231 is connected to a rotating handle 233. The support ring 241 is also connected to a sliding sleeve 2411 that slides with the guide rod 232. The support ring 241 is also provided with a threaded sleeve 2412 that is threadedly connected to the lead screw 231. The threaded sleeve 2412 is also connected to a sleeve 24121. The bottom of the moving frame 21 is also provided with a first slider 22 that slides with the slide rail 3. The first slider 22 is also rotatably disposed with a first fixing screw 221. One end of the first fixing screw 221 is also connected to a first pressure block 222 that can press against the slide rail 3.

[0041] Loosen the first fixing screw 221, causing the first pressure block 222 to disengage from the slide rail 3, thus releasing the fixation of the first slider 22. Push or pull the head fixation assembly 2, causing the first slider 22 to slide along the slide rail 3, moving the head fixation assembly 2 to a suitable position. Rotate the first fixing screw 221, causing the first pressure block 222 to press against the slide rail 3, fixing the first slider 22 to the slide rail 3 through friction, thereby fixing the position of the head fixation assembly 2. The operator manually rotates the rotating handle 233, causing the lead screw 231 to rotate. Since the threaded sleeve 2412 is connected to the lead screw 231 by threads, and the sliding sleeve 2411 is in sliding engagement with the guide rod 232, when the lead screw 231 rotates, the threaded sleeve 2412 is subjected to the force of the threads, causing the support ring 241 to move along the axis of the guide rod 232 and the lead screw 231, realizing the position adjustment of the head fixation mechanism 24 along the width direction of the bed 1 to adapt to the position of different patients' heads.

[0042] The head fixing mechanism 24 also includes a head limiting mechanism 242. The head limiting mechanism 242 includes a slide rod 2422 that is slidably disposed in the sleeve 24121. A head top block 2421 is also provided at one end of the slide rod 2422 away from the sleeve 24121. A first spring 2423 is sleeved on the slide rod 2422. One end of the first spring 2423 is connected to the head top block 2421, and the other end of the first spring 2423 is connected to the sleeve 24121.

[0043] Once the patient's head is positioned appropriately within the head immobilization mechanism 24, the elastic force of the first spring 2423 will cause the head block 2421 to apply appropriate pressure to the patient's head, thus providing restraint and support. Simultaneously, the cushioning effect of the first spring 2423 prevents the head block 2421 from exerting excessive pressure on the patient's head, improving patient comfort.

[0044] The body fixation assembly 4 also includes a flexible fixation pad 41 disposed above the bed 1 and capable of wrapping the patient's body. Both ends of the flexible fixation pad 41 are connected to elastic straps 411, and hooks 412 are connected to the elastic straps 411. The body fixation assembly 4 also includes a second slider 42 slidably disposed on the slide rail 3, and a second fixing screw 421 is rotatably disposed on the second slider 42. One end of the second fixing screw 421 is connected to a second pressure block 422 that can press against the slide rail 3. The side of the second slider 42 is also provided with a groove that allows the hooks 412 to be hung on the second slider 42.

[0045] Loosen the second fixing screw 421, causing the second pressure block 422 to disengage from the slide rail 3, thus releasing the fixation on the second slider 42. Push or pull the body fixation assembly 4 to slide the second slider 42 along the slide rail 3, moving the body fixation assembly 4 to a suitable position to accommodate the patient's body position and examination needs. Rotate the second fixing screw 421 to press the second pressure block 422 onto the slide rail 3, fixing the second slider 42 onto the slide rail 3 through friction, thereby fixing the position of the body fixation assembly 4. Place the patient on the bed 1, adjust the position, and cover the patient's body with the flexible fixation pad 41. Tighten the elastic bandage 411 to make the flexible fixation pad 41 fit tightly against the patient's body, and then hook the hook 412 on the elastic bandage 411 into the groove on the side of the second slider 42 to fix the patient's body.

[0046] A method for fixing a movable CT imaging external fixator, comprising one of the movable CT imaging external fixators described above, including the following steps:

[0047] S1: The patient lies on the bed 1. According to the position of the patient's head, the moving frame 21 is moved to move the head fixing component 2 to the position of the patient's head. Then, by rotating the first fixing screw 221, the first fixing screw 221 causes the first pressure block 222 to press on the slide rail 3. By rotating the rotating handle 233, the screw 231 is rotated, causing the support ring 241 to move to the position of the patient's head.

[0048] S2: Place the patient's head on the height-adjusting airbag 246, then open the control valve 2473 on the connecting tube 2472 connected to the height-adjusting airbag 246, and at the same time close the control valves 2473 connected to the two side clamping airbags 245. By operating the air pump 2471, gas is introduced into the height-adjusting airbag 246 to adjust the height. When the patient's head reaches the appropriate height, stop inflating.

[0049] S3: By rotating the adjusting screw 2442, the clamping block 2443 is brought closer to the patient's head. By closing the control valve 2473 connected to the height adjusting airbag 246, the control valve 2473 connected to the side clamping airbag 245 is opened. By operating the air pump 2471, air is introduced into the side clamping airbag 245. The side clamping airbag 245 fixes the patient's head, and the pressure detection device 2444 detects the pressure to avoid excessive clamping force and causing discomfort to the patient.

[0050] S4: By rotating the adjustment frame 2432, the pad 2433 is placed against the patient's chin, and the head is further fixed by the action of the head block 2421 and the pad 2433.

[0051] S5: The patient's body is fixed by the action of the body fixation component 4.

[0052] The above embodiments only illustrate one or more implementation methods of this invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this invention, and these all fall within the protection scope of this invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A movable external fixator for CT imaging examination, characterized in that: include: A bed (1) is used to allow patients to lie on it and to move patients to the CT scanner; The head fixing component (2) is located above the bed frame (1) and can reciprocate along the length of the bed frame (1); The slide rail (3) is fixed on both sides of the bottom of the bed (1) and slides in conjunction with the head fixing assembly (2); The body fixing component (4) is set above the bed (1) and can move back and forth along the length of the bed (1), and slides in cooperation with the slide rail (3); The head-fixing assembly (2) includes movable frames (21) distributed on both sides of the bed (1). The head-fixing assembly (2) also includes a head-fixing mechanism (24) capable of reciprocating along the width of the bed (1). The slide rail (3) further includes a moving drive mechanism (23) disposed between the two movable frames (21) for driving the head-fixing mechanism (24) to reciprocate. The head-fixing mechanism (24) includes a support ring (241), and the support ring (241) has two sides... The device is equipped with a clamping assembly (244) for fixing the patient's head and a head support (248) for supporting the patient's head located at the bottom of the support ring (241). The clamping assembly (244) includes two clamping blocks (2443) for clamping the sides of the patient's head, and the clamping part of the clamping block (2443) is also provided with an inflatable side clamping airbag (245). The head support (248) is also provided with an inflatable height-adjustable airbag (246).

2. The movable external fixator for CT imaging examination according to claim 1, characterized in that: The clamping assembly (244) further includes a connecting block (2441) disposed on the support ring (241), and an adjusting screw (2442) is rotatably disposed on the connecting block (2441) by means of a thread. The clamping assembly (244) further includes a pressure detection device (2444) disposed between the connecting block (2441) and the clamping block (2443) for detecting the pressure applied to the patient's head by the side clamping airbag (245).

3. The movable external fixator for CT imaging examination according to claim 2, characterized in that: The head fixation mechanism (24) further includes an inflation assembly (247) for inflating gas into the two side clamping airbags (245) and the height adjusting airbag (246), and the side clamping airbags (245) and the height adjusting airbag (246) are also provided with deflation valves for deflating.

4. The movable external fixator for CT imaging examination according to claim 3, characterized in that: The inflation assembly (247) further includes connecting pipes (2472) that are respectively connected to the two side clamping airbags (245) and the height adjusting airbag (246), and the connecting pipes (2472) are also provided with control valves (2473) that can independently control the gas entering the two side clamping airbags (245) and the height adjusting airbag (246). The inflation assembly (247) is also provided with an air pump (2471) connected to the head limiting mechanism (242) for inflating gas into the side clamping airbags (245) and the height adjusting airbag (246).

5. A movable external fixator for CT imaging examination according to claim 1, characterized in that: The clamping assembly (244) also has a chin limiting assembly (243) rotatably mounted on the connecting block (2441) for supporting the patient's chin.

6. A movable external fixator for CT imaging examination according to claim 5, characterized in that: The chin limiting assembly (243) includes two adjusting members (2431) rotatably mounted on the connecting block (2441). The adjusting members (2431) are also provided with adjusting frames (2432) that can slide within the adjusting members (2431). The adjusting frames (2432) are arc-shaped, and a pad (2433) that can contact the patient's chin is also slidably mounted on the adjusting frames (2432).

7. A movable external fixator for CT imaging examination according to claim 6, characterized in that: The chin limiting assembly (243) further includes a second spring (2434) disposed inside the adjusting member (2431) and giving the adjusting frame (2432) a tendency to return to its original position. One end of the second spring (2434) is connected to the adjusting frame (2432), and the other end of the second spring (2434) is connected to the inside of the adjusting member (2431).

8. A movable external fixator for CT imaging examination according to claim 1, characterized in that: The moving drive mechanism (23) includes a lead screw (231) rotatably disposed between the moving frames (21) and capable of reciprocating the head fixing mechanism (24) and a guide rod (232) for guiding the support ring (241). One end of the lead screw (231) is connected to a rotating handle (233). The support ring (241) is also connected to a sliding sleeve (2411) that slides with the guide rod (232). The support ring (241) is also provided with a threaded sleeve (2412) that is threadedly connected to the lead screw (231). The threaded sleeve (2412) is also connected to a sleeve (24121). The bottom of the moving frame (21) is also provided with a first slider (22) that slides with the slide rail (3). The first slider (22) is also rotatably disposed with a first fixing screw (221). One end of the first fixing screw (221) is also connected to a first pressure block (222) that can press on the slide rail (3).

9. A movable external fixator for CT imaging examination according to claim 8, characterized in that: The head fixing mechanism (24) further includes a head limiting mechanism (242), which includes a slide rod (2422) slidably disposed in the sleeve (24121). A head top block (2421) is also provided at one end of the slide rod (2422) away from the sleeve (24121). A first spring (2423) is sleeved on the slide rod (2422). One end of the first spring (2423) is connected to the head top block (2421), and the other end of the first spring (2423) is connected to the sleeve (24121).

10. A method for fixing a movable external fixator for CT imaging examination, comprising the movable external fixator for CT imaging examination as described in any one of claims 1-9, characterized in that: Includes the following steps: S1: The patient lies on the bed (1). According to the position of the patient's head, the moving frame (21) is moved to move the head fixing component (2) to the position of the patient's head. Then, by rotating the first fixing screw (221), the first fixing screw (221) presses the first pressure block (222) onto the slide rail (3). By rotating the rotating handle (233), the screw (231) is rotated, and the support ring (241) is moved to the position of the patient's head. S2: Place the patient's head on the height-adjusting airbag (246), and then open the control valve (2473) on the connecting tube (2472) connected to the height-adjusting airbag (246) while closing the control valves (2473) connected to the two side clamping airbags (245). By operating the air pump (2471), gas is introduced into the height-adjusting airbag (246) to adjust the height. When the patient's head reaches the appropriate height, stop inflating. S3: By rotating the adjusting screw (2442), the clamping block (2443) is brought closer to the patient's head. By closing the control valve (2473) connected to the height adjusting airbag (246), the control valve (2473) connected to the side clamping airbag (245) is opened. By operating the air pump (2471), air is introduced into the side clamping airbag (245). The side clamping airbag (245) fixes the patient's head, and the pressure detection device (2444) detects the pressure to avoid excessive clamping force and causing discomfort to the patient. S4: By rotating the adjustment frame (2432), the pad (2433) is placed against the patient's chin, and the head is further fixed by the action of the head block (2421) and the pad (2433); S5: The patient's body is fixed by the action of the body fixation component (4).

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