A nuclear medicine imaging patient limb immobilization support device

Abstract

The application discloses a nuclear medicine imaging patient limb fixing and supporting device and belongs to the technical field of medical equipment. The fixing and supporting device comprises a scanning bed, a moving frame structure arranged on the scanning bed, a pressing structure comprising an air bag arranged on the moving frame structure, a vacuum pump arranged on one side of the scanning bed, a pressure detection assembly and an air path switching assembly arranged on the air bag and connected with the vacuum pump and the pressure detection assembly. The three-way valve of the air path switching assembly is switched to connect the air bag with the vacuum pump to complete inflation for limiting diaphragm displacement, then the pressure detection assembly and the air bag are connected, the air bag is pressed by the breathing abdomen, non-invasive breathing phase recognition is realized, image tailing artifacts caused by diaphragm lifting are reduced, and the imaging clarity of nuclear medicine imaging lesions and the scanning judgment accuracy are improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, specifically a limb fixation and support device for patients undergoing nuclear medicine imaging. Background Technology

[0002] In nuclear medicine imaging examinations, equipment such as PET / CT and SPECT / CT are required to perform whole-body or local scans on patients to obtain precise fusion of functional metabolic images and anatomical images.

[0003] Traditionally, patients lie flat on the scanning table without any auxiliary fixation devices, relying on their own strength to remain still during the scan. However, a Chinese invention patent with publication number CN121647713A discloses a fixation device for nuclear medicine bone imaging. This device, through a sliding adjustable frame, a damped angled foot restraint frame, and Velcro straps, adapts to different patients and fixes them in a standard scanning position, reducing image artifacts and improving the quality of bone imaging and diagnosis. However, its main purpose is to locally fix the patient's limbs to prevent limb displacement. However, when it comes to chest and abdominal scans, since respiratory movement is a physiological activity that the human body cannot suppress involuntarily, the diaphragm moves up and down rhythmically during breathing, causing organs such as the liver, stomach fundus, and lung base to change position with the respiratory cycle. The limb fixation method cannot effectively restrain the movement of the chest and abdomen. In PET / CT scans that require several minutes of continuous acquisition, the organ displacement caused by respiratory movement can easily lead to registration misalignment between PET functional images and CT anatomical images. This results in lesion areas appearing blurred, trailed, or misaligned in the fused images. Small lesions are often obscured or difficult to identify due to motion artifacts, reducing the accuracy of nuclear medicine imaging in the diagnosis of chest and abdominal lesions.

[0004] Therefore, this application provides a limb fixation and support device for patients undergoing nuclear medicine imaging to solve the above-mentioned problems. Summary of the Invention

[0005] This application provides a limb fixation support device for nuclear medicine imaging patients, aiming to solve the problems mentioned in the background art, such as the existing nuclear medicine imaging fixation methods that can only restrain the patient's limbs and cannot suppress the displacement of the diaphragm and organs caused by chest and abdominal respiratory movements. Under long-term scanning, functional images and anatomical images are prone to registration misalignment, resulting in motion artifacts, blurred and misaligned lesion display, and reduced diagnostic accuracy of chest and abdominal lesions.

[0006] To achieve the above objectives, this application provides the following technical solution: a limb fixation and support device for patients undergoing nuclear medicine imaging, including a scanning bed, and further comprising... A movable frame structure is disposed on the scanning bed and is used to slide, adjust, and lock the positioning along the length direction of the scanning bed. The pressure-applying structure includes an airbag mounted on the movable frame structure, a vacuum pump located on one side of the scanning bed for supplying air to the airbag to inflate it and press against the patient's abdomen, a pressure detection component for collecting pressure fluctuations within the airbag to identify the patient's respiratory phase, and an airway switching component mounted on the airbag and connected to the vacuum pump and pressure detection component for either enabling the airbag and vacuum pump to inflate or enabling the pressure detection component to detect respiratory pressure. The airbag can be adjusted and locked in position by sliding the movable frame structure along the length of the scanning bed, allowing it to be adjusted according to the patient's breathing type. Moving the device to the upper abdomen or abdomen allows for targeted pressure on the respiratory power source, improving adaptability to different body types and facilitating patient restraint on the scanning bed. Simultaneously, the three-way valve of the airway switching component connects the cuff to the vacuum pump to inflate and restrict diaphragmatic displacement. Then, the pressure detection component connects to the cuff, utilizing the principle of intracavitary pressure fluctuation caused by abdominal contractions during respiration. This converts respiratory motion into a real-time acquireable pressure electrical signal, enabling non-invasive respiratory phase recognition, reducing image trailing artifacts caused by diaphragmatic elevation, and improving the clarity of lesion imaging and the accuracy of scanning judgment in nuclear medicine imaging.

[0007] Preferably, to achieve the sliding adjustment and locking positioning of the movable frame structure on the scanning bed, the movable frame structure includes carbon fiber U-shaped frames symmetrically arranged on both sides of the movable frame structure, elastic U-shaped clamps fixedly connected to both ends of the carbon fiber U-shaped frames for clamping the edge of the scanning bed, and locking screws that extend laterally through the elastic U-shaped clamps and are screwed onto the elastic U-shaped clamps for abutting against the edge of the scanning bed. Through the cooperation of the carbon fiber U-shaped frames, elastic U-shaped clamps, and locking screws, the movable frame structure can slide and be stably locked along the length of the scanning bed, thereby facilitating the adjustment of the airbag pressure position according to different patient body shapes and breathing types.

[0008] Preferably, to avoid artifact interference from metal components in nuclear medicine imaging images, the locking screw is made of plastic. By using plastic for the locking screw, hardening beam artifacts and photon attenuation caused by metal in CT or PET scans are avoided, thereby ensuring the accuracy and clarity of nuclear medicine image reconstruction.

[0009] Preferably, in order to achieve unidirectional expansion of the airbag and ensure that the airbag only protrudes and applies pressure to the patient's abdomen, the side of the airbag away from the scanning bed is a non-inflatable body, and the side of the airbag closer to the scanning bed is an inflatable body. The two ends of the non-inflatable body are fixedly connected to two carbon fiber U-shaped frames respectively. By fixing the two ends of the non-inflatable body to two carbon fiber U-shaped frames respectively, the airbag protrudes unidirectionally towards the patient's abdomen from the inflatable body when inflated. This avoids the airbag expanding and releasing pressure to the outside of the moving frame structure, and ensures that the airbag closely adheres to the body surface to transmit respiratory pressure, thereby improving the sensitivity of pressure signal acquisition.

[0010] Preferably, in order to convert the respiratory pressure fluctuations within the airbag into a recognizable electrical signal, the pressure detection component includes a pressure tube connected to the airway switching component and a pressure sensor fixedly connected to the sealed end of the pressure tube for detecting the pressure fluctuations within the airbag; by connecting the pressure tube to the airway switching component and fixing the pressure sensor to the sealed end of the pressure tube, the pressure fluctuations generated by respiratory movements within the airbag can be converted into electrical signals in real time, thereby achieving non-invasive identification of the respiratory phase.

[0011] Preferably, in order to facilitate subsequent deflation of the airbag, a pressure relief valve is fixedly connected to the pressure pipe; by setting a pressure relief valve on the pressure pipe, it is easy to open the pressure relief valve to release the air pressure inside the airbag after the test is completed.

[0012] Preferably, in order to achieve the switching between the airbag and the vacuum pump inflation connection and the pressure tube pressure measurement connection, the air path switching component includes a hose fixedly connected to one side of the airbag and a three-way valve disposed at the end of the hose away from the airbag. The hose is fixedly connected to the first interface on the three-way valve, and the ends of the vacuum pump and the pressure tube away from the pressure sensor are respectively fixedly connected to the second and third interfaces on the three-way valve. By connecting one end of the hose to the airbag and the other end to the first interface of the three-way valve, and the vacuum pump and the pressure tube being connected to the second and third interfaces of the three-way valve respectively, the air path direction can be switched using the three-way valve, realizing convenient switching between the two working states of inflation and pressure measurement without interference.

[0013] Preferably, to increase the frictional force in contact with the patient's skin, the fixed support device further includes a polyester mesh cover disposed on the side of the expansion body near the scanning bed, and a detachable component disposed on the polyester mesh cover and the expansion body for removing the polyester mesh cover; the detachable connection is achieved by the polyester mesh cover covering the body surface contact surface of the expansion body and the detachable component, which increases the frictional force between the airbag and the patient's skin to prevent slippage, further improves the accuracy of pressure detection, improves the clarity of lesion imaging and the accuracy of scanning judgment in nuclear medicine imaging, and at the same time, facilitates disassembly and cleaning.

[0014] Preferably, in order to achieve a detachable connection between the polyester mesh cover and the inflator, the detachable component includes hook and loop fasteners fixedly connected to both sides of the polyester mesh cover and hook and loop fasteners fixedly connected to the edge of the inflator and adapted to the hook and loop fasteners; by fixing the hook and loop fasteners to both sides of the polyester mesh cover and fixing the hook and loop fasteners to the edge of the inflator and adhering to each other, tool-free quick assembly and disassembly of the polyester mesh cover and the airbag is achieved, thereby facilitating replacement and cleaning operations in clinical use.

[0015] This nuclear medicine imaging patient limb fixation support device uses a movable frame structure to slide, adjust, and lock the position along the length of the scanning bed. This allows the airbag to move to the upper abdomen or abdomen according to the patient's breathing type, thereby applying targeted pressure to the respiratory power source, improving adaptability to different body types, and making it easier to restrain and fix the patient's body on the scanning bed. This nuclear medicine imaging patient limb fixation support device switches the airway switching component through a three-way valve, allowing the airbag to be connected to the vacuum pump to complete inflation and restrict diaphragmatic displacement. Then, the pressure detection component is connected to the airbag. Utilizing the principle that the abdominal movement during breathing compresses the airbag, causing intracavitary pressure fluctuations, the respiratory motion is converted into a pressure electrical signal that can be acquired in real time. This enables non-invasive respiratory phase recognition, reduces image trailing artifacts caused by diaphragmatic elevation, and improves the clarity of lesion imaging and the accuracy of scanning judgment in nuclear medicine imaging. This limb fixation support device for nuclear medicine imaging achieves detachable connection by covering the body surface of the inflatable body with a polyester mesh cover and detachable parts. This increases the friction between the airbag and the patient's skin to prevent slippage, further improving the accuracy of pressure detection, enhancing the clarity of lesion imaging and the accuracy of scanning judgment in nuclear medicine imaging, while also facilitating disassembly and cleaning. Attached Figure Description

[0016] Figure 1 A schematic diagram of the application structure of a limb fixation and support device for patients undergoing nuclear medicine imaging. Figure 2 A schematic diagram of a limb fixation and support device for patients undergoing nuclear medicine imaging. Figure 3 A schematic diagram of a movable frame structure in a limb fixation and support device for nuclear medicine imaging patients; Figure 4 A schematic diagram of a locking screw in a limb fixation and support device for nuclear medicine imaging patients; Figure 5 This is a partial structural diagram of the pressure application structure in a limb fixation and support device for nuclear medicine imaging patients. Figure 6 This is a schematic diagram of the pressure detection component in a limb fixation and support device for nuclear medicine imaging patients. Figure 7 A schematic diagram of the structure of an airbag and a polyester mesh cover in a limb fixation and support device for patients undergoing nuclear medicine imaging. Figure 8 This is a schematic diagram of the structure of a polyester mesh cover and detachable components in a limb fixation support device for nuclear medicine imaging patients.

[0017] In the picture: 1. Scanning bed; 2. Movable frame structure; 21. Carbon fiber U-shaped frame; 22. Elastic U-shaped clamp; 23. Locking screw; 3. Pressure application structure; 31. Airbag; 311. Non-expandable body; 312. Expandable body; 32. Vacuum pump; 33. Pressure detection assembly; 331. Pressure pipe; 332. Pressure sensor; 333. Pressure relief valve; 34. Gas path switching assembly; 341. Hoses; 342. Three-way valve; 343. First interface; 344. Second interface; 345. Third interface; 4. Polyester mesh fabric cover; 5. Detachable parts; 51. Hook and loop fastener side; 52. Hook and loop fastener hook side. Detailed Implementation

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

[0019] Example 1 This embodiment provides a limb fixation and support device for patients undergoing nuclear medicine imaging, such as... Figures 1-7 As shown, the fixed support device includes a scanning bed 1 and a movable frame structure 2. The movable frame structure 2 is mounted on the scanning bed 1 and is used to slide, adjust, and lock in position along the length of the scanning bed 1. The pressure application structure 3 includes an airbag 31 mounted on the movable frame structure 2, a vacuum pump 32 mounted on one side of the scanning bed 1 for supplying air to the airbag 31 to inflate it and press against the patient's abdomen, a pressure detection component 33 for collecting pressure fluctuations within the airbag 31 to identify the patient's respiratory movement phase, and an airway switching component 34 mounted on the airbag 31 and connected to the vacuum pump 32 and the pressure detection component 33 for connecting the airbag 31 and the vacuum pump 32 for inflation or connecting the pressure detection component 33 for detecting respiratory pressure.

[0020] During use, the operator slides the movable frame structure 2 along the length of the scanning bed 1 to the corresponding position on the patient's upper abdomen or abdomen, according to the patient's body size and breathing type (thoracic or abdominal breathing). The movable frame structure 2 is then locked and fixed to the scanning bed 1. Subsequently, by switching the gas path switching component 34 to the inflation position, the airbag 31 is connected to the vacuum pump 32 through the gas path switching component 34. The vacuum pump 32 is then activated to supply air to the airbag 31. At this time, the airbag 31 expands and bulges towards the patient's abdomen under air pressure until it fits tightly against the patient's upper abdomen or abdominal surface, forming a uniform pre-pressure contact with the abdomen. This achieves targeted pressure and follow-up constraint on the respiratory power source, the diaphragm. After inflation, the operator switches the gas path switching component 34 to the detection position, connecting the airbag 31 to the pressure detection component 33 through the gas path switching component 34. During nuclear medicine imaging... During the imaging process, the patient's spontaneous breathing causes the abdomen to rise and fall rhythmically with the movement of the diaphragm. The rising and falling abdomen repeatedly compresses or releases the air bladder 31, causing the internal volume of the air bladder 31 to continuously generate regular pressure fluctuations with the respiratory cycle. The pressure fluctuation signal is completely transmitted to the pressure detection component 33 through the connected tubing. The pressure detection component 33 collects the continuously changing air pressure data in real time and converts it into corresponding electrical signals, thereby completing the extraction of respiratory motion signals and the identification of respiratory phases. This electrical signal is synchronously transmitted to the control system of the nuclear medicine imaging equipment, which not only makes it easier for the operator to identify the end-expiratory plateau phase with the smallest organ displacement amplitude, but also synchronously triggers the scanning equipment to carry out imaging acquisition during this period. Relying on the mechanical constraint of the air bladder 31 in the early stage to reduce the amplitude of organ movement, combined with the precise segmented acquisition at the end of expiration, the image trailing artifact caused by the upward movement of the diaphragm is reduced, and the clarity of lesion imaging and diagnostic accuracy are improved.

[0021] Specifically, the movable frame structure 2 includes carbon fiber U-shaped frames 21 symmetrically arranged on both sides of the movable frame structure 2, elastic U-shaped clamping blocks 22 fixedly connected to both ends of the carbon fiber U-shaped frames 21 for clamping the edge of the scanning bed 1, and locking screws 23 that pass through the elastic U-shaped clamping blocks 22 laterally and are screwed onto the elastic U-shaped clamping blocks 22 for pressing against the edge of the scanning bed 1.

[0022] Before use, move the movable frame structure 2 to the side of the scanning bed 1. First, loosen the locking screw 23 to release the locking screw 23 from its tightness limit on the elastic U-shaped clamp 22, so that the inner side of the elastic U-shaped clamp 22 forms a clamping gap that can accommodate the side of the scanning bed 1. Then, insert the elastic U-shaped clamps 22 at both ends of the two symmetrically arranged carbon fiber U-shaped frames 21 from the left and right edges of the scanning bed 1, so that the side of the scanning bed 1 is completely placed inside the clamping cavity of the elastic U-shaped clamp 22. Then, push and pull the carbon fiber U-shaped frame 21 along the length of the scanning bed 1 as a whole. The elastic U-shaped clamps 22 can slide along the edge of the scanning bed 1 with the carbon fiber U-shaped frame 21, thereby driving the carbon fiber U-shaped frame 21 and subsequent assembly. The airbag 31 on the carbon fiber U-shaped frame 21 is moved synchronously. Then, it can be adjusted to the target pressure position according to the patient's body shape and respiratory characteristics. After the position is adjusted, the locking screw 23 is rotated. The locking screw 23 extends laterally along its own thread towards the side of the scanning bed 1. The end of the locking screw 23 continuously presses against the outer wall of the scanning bed 1. With the elastic U-shaped clamp 22 itself, a bidirectional clamping locking force is formed to firmly fix the elastic U-shaped clamp 22 to the edge of the scanning bed 1. The sliding position of the carbon fiber U-shaped frame 21 is locked at the same time. Thus, the carbon fiber U-shaped frame 21 provides a stable bearing base and provides rigid installation support for the airbag 31, ensuring that the pressure point of the airbag 31 on the patient's abdomen remains stable.

[0023] To avoid artifact interference from metal components in nuclear medicine imaging, the locking screw 23 is made of plastic. The locking screw 23 is made of wear-resistant nylon engineering plastic. Because the material is entirely free of metal components and has good X-ray penetration, it completely avoids the hardening beam artifacts and photon attenuation problems that traditional metal screws produce in CT or PET scans. It also possesses excellent structural strength and abrasion resistance, making it resistant to wear, stripping, and deformation even after repeated tightening and adjustment over a long period. This ensures the long-term locking stability of the device while effectively guaranteeing the accuracy and clarity of nuclear medicine image reconstruction.

[0024] Furthermore, the side of the airbag 31 away from the scanning bed 1 is a non-expandable body 311, and the side of the airbag 31 closer to the scanning bed 1 is an expandable body 312. The two ends of the non-expandable body 311 are respectively fixedly connected to two carbon fiber U-shaped frames 21.

[0025] When the airbag 31 is inflated and pressurized by the vacuum pump 32, the side of the airbag 31 away from the scanning bed 1 is a non-inflatable body 311, and both ends of the non-inflatable body 311 are fixedly connected to two carbon fiber U-shaped frames 21. The material and connection method of the non-inflatable body 311 determine that it hardly deforms under air pressure. Therefore, the air pressure cannot push the non-inflatable body 311 to expand away from the patient. The air pressure energy is forcibly confined inside the airbag 31 and directed to the inflatable body 312 on the side of the airbag 31 closer to the scanning bed 1. The inflatable body 312 is made of elastic deformable material and expands unidirectionally towards the patient's abdomen under air pressure until it fits tightly against the patient's upper abdomen or abdominal surface, forming a uniform pre-pressure contact with the abdomen. The overall position of the airbag 31 in the inflated state is constrained by the two carbon fiber U-shaped frames 21. Between the U-shaped frames 21, there will be no displacement or movement relative to the movable frame structure 2 due to the air pressure reaction force, ensuring that the inflatable body 312 is always aligned with the patient's abdomen and maintains a stable pressure direction. During nuclear medicine imaging scans, the patient's abdomen undulates periodically with the movement of the diaphragm during breathing. The undulating abdomen repeatedly squeezes or releases the inflatable body 312. Since the non-inflatable body 311 is fixed and constrained by the carbon fiber U-shaped frame 21 and cannot move outward, the change in internal volume caused by the abdominal cavity squeezing the inflatable body 312 is completely converted into pressure fluctuations inside the air bladder 31. These pressure fluctuations are transmitted to the pressure detection component 33 via the airway switching component 34. The pressure detection component 33 collects the data in real time and converts it into an electrical signal output, thereby realizing the extraction of respiratory motion signals and the identification of respiratory phase.

[0026] Furthermore, the pressure detection component 33 includes a pressure tube 331 connected to the air path switching component 34 and a pressure sensor 332 fixedly connected to the sealed end of the pressure tube 331 for detecting pressure fluctuations within the airbag 31.

[0027] In addition, in order to facilitate the subsequent deflation of the airbag 31, a pressure relief valve 333 is fixedly connected to the pressure pipe 331; by setting the pressure relief valve 333 in the pressure pipe 331, the pressure relief valve 333 can be easily opened to release the internal air pressure of the airbag 31 after the test is completed.

[0028] When the gas path switching component 34 is switched, the airbag 31 is connected to the pressure tube 331 of the pressure detection component 33 through the gas path switching component 34. At this time, the inside of the airbag 31, the pressure tube 331, and the pressure sensor 332 fixedly connected to the sealed end of the pressure tube 331 together form a closed pressure measuring chamber. During nuclear medicine imaging scans, the patient's abdomen rises and falls periodically with the movement of the diaphragm during breathing. The rising and falling abdomen repeatedly squeezes or releases the inflatable body 312 of the airbag 31, causing the internal volume of the airbag 31 to change regularly with the respiratory cycle. This volume change causes the gas pressure in the closed pressure measuring chamber to fluctuate synchronously and periodically. This pressure fluctuation is transmitted to the pressure tube 331 through the hose 341 connected to the airbag 31 and the gas path switching component 34, and then directly transmitted from the pressure tube 331 to the pressure sensor 332 fixedly connected to its sealed end. The pressure sensor 332 senses the pressure in real time. The pressure tube 331 transmits continuously changing air pressure data, converts the physical pressure signal into a corresponding electrical signal, and outputs it to the control system of the nuclear medicine imaging equipment. This completes the extraction of respiratory motion signals and the identification of respiratory phase, enabling the judgment of the end-expiratory plateau phase and the synchronous triggering of the scanning equipment. During the detection process, if the pressure in the air bag 31 and pressure tube 331 rises sharply and exceeds the preset safety threshold due to the patient's violent cough or sudden body movement, the scanning will not be triggered. After all the scanning detections are completed, the operator manually opens the pressure relief valve 333 fixedly connected to the pressure tube 331, allowing the residual air pressure in the air bag 31 and pressure tube 331 to be quickly released to the atmosphere through the pressure relief valve 333. The air bag 31 then deflates, contracts, and detaches from the patient's abdomen. Subsequently, the locking and positioning of the moving frame structure 2 is released, and the moving frame structure 2 is moved away from the scanning bed 1, thus releasing the fixation on the patient.

[0029] Furthermore, the gas path switching assembly 34 includes a hose 341 fixedly connected to one side of the airbag 31 and a three-way valve 342 disposed at the end of the hose 341 away from the airbag 31. The hose 341 is fixedly connected to the first interface 343 on the three-way valve 342, and the ends of the vacuum pump 32 and the pressure tube 331 away from the pressure sensor 332 are respectively fixedly connected to the second interface 344 and the third interface 345 on the three-way valve 342.

[0030] When the airbag 31 needs to be inflated, the operator manually operates the three-way valve 342 to connect the first port 343 and the second port 344. At this time, the airbag 31 forms a complete inflation circuit with the vacuum pump 32 through the hose 341, the first port 343 and the second port 344 of the three-way valve 342. The operator starts the vacuum pump 32, and the gas enters the three-way valve 342 through the second port 344, then enters the hose 341 through the first port 343, and finally enters the airbag 31 through the hose 341. As the gas continues to inflate, the side of the airbag 31 closest to the patient's abdomen expands. The body 312 expands and protrudes towards the patient's abdomen until it fits tightly against the patient's upper abdomen or abdominal surface, creating uniform pre-pressure contact and achieving targeted pressure and follow-up constraint on the diaphragm, the respiratory power source. After inflation, the operator manually operates the three-way valve 342 again, connecting the first port 343 and the third port 345 of the three-way valve 342. At this time, the inflation circuit between the first port 343 and the second port 344 is cut off, and the air passage between the vacuum pump 32 and the air bag 31 is physically isolated. At this time, the air bag 31 is connected through the hose 341 and the first port 343 of the three-way valve 342. The third interface 345, pressure tube 331, and pressure sensor 332 form a complete closed pressure measurement circuit. This closed pressure measurement circuit is completely isolated from the vacuum pump 32 side, avoiding interference from residual gas fluctuations in the vacuum pump 32 pipeline on the pressure measurement signal. During nuclear medicine imaging scans, the patient's abdomen rises and falls periodically with the movement of the diaphragm during breathing. The rising and falling abdomen repeatedly compresses or releases the air bladder 31, causing pressure fluctuations inside the air bladder 31 that change synchronously with the respiratory cycle. These pressure fluctuations are transmitted through the hose 341 to the first interface 343 of the three-way valve 342, and then through the three-way valve 342. The internal pressure is transmitted to the pressure tube 331 via the third interface 345. Finally, the pressure sensor 332, which is fixedly connected to the sealed end of the pressure tube 331, receives the signal in real time and converts it into an electrical signal output, thereby completing the acquisition of respiratory motion signals and the identification of respiratory phase. After all the scanning and detection are completed, the operator opens the pressure relief valve 333, which is fixedly connected to the pressure tube 331. The residual air pressure in the airbag 31 is released to the atmosphere through the pressure relief valve 333 via the hose 341, the first interface 343 and the third interface 345 of the three-way valve 342, and the pressure tube 331. The airbag 31 then deflates, contracts, and detaches from the patient's abdomen.

[0031] Example 2 Unlike Example 1, as Figure 7 and Figure 8As shown, in order to improve the frictional force in contact with the patient's skin, the fixed support device also includes a polyester mesh cover 4 disposed on the side of the expansion body 312 near the scanning bed 1, and a detachable part 5 disposed on the polyester mesh cover 4 and the expansion body 312 for removing the polyester mesh cover 4. The detachable part 5 includes a Velcro loop surface 51 fixedly connected to both sides of the polyester mesh cover 4, and a Velcro hook surface 52 fixedly connected to the edge of the expansion body 312 and adapted to the Velcro loop surface 51.

[0032] Before the device is assembled and put into clinical use, the polyester mesh cover 4 is first installed and fixed. The polyester mesh cover 4 is laid flat and attached to the contact surface of the inflator 312 of the airbag 31 facing the human body, ensuring the polyester mesh cover 4 completely covers the pressure contact area of ​​the inflator 312. Then, the Velcro loops 51 fixed on both sides of the polyester mesh cover 4 are pressed and attached to the Velcro hooks 52 fixed at the edge of the inflator 312. The adhesive fit between the Velcro loops 51 and the Velcro hooks 52 locks the detachable part 5 in place, ensuring the polyester mesh cover 4 is securely attached to the surface of the inflator 312. During clinical operation, the fixed polyester mesh cover 4 can directly contact the patient's abdominal skin, utilizing the mesh fabric's properties to increase the coefficient of friction between the inflator 312 and the human skin, preventing the airbag 31 from pressing against the patient's skin. The abdominal area slips and shifts, ensuring a constant pressure position for the inflator 312 and a stable position for collecting respiratory deformation data. This avoids abnormal pressure signal fluctuations and detection errors caused by the displacement of the airbag 31. Meanwhile, the thin and hollow polyester mesh cover 4 does not hinder the expansion and contraction of the inflator 312 during respiration, nor does it obstruct X-ray penetration, thus not affecting the nuclear medicine imaging effect or pressure detection accuracy. When a single scan is completed or when equipment disinfection and maintenance are required, the Velcro loop side 51 and Velcro hook side 52 can be separated simply by tearing in the opposite direction, quickly releasing the fixed state of the detachable part 5 and achieving non-destructive disassembly of the polyester mesh cover 4. This facilitates separate cleaning, disinfection, or replacement of the polyester mesh cover 4, and allows for separate cleaning and maintenance of the airbag 31, reducing the risk of cross-infection in clinical settings and improving the hygiene and convenience of the device in clinical use.

[0033] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A nuclear medicine imaging patient limb fixation support apparatus comprising a scanning bed (1) characterised in that: Also includes A movable frame structure (2) is provided on the scanning bed (1) for sliding adjustment and locking positioning along the length direction of the scanning bed (1); The pressure application structure (3) includes an airbag (31) disposed on the movable frame structure (2), a vacuum pump (32) disposed on one side of the scanning bed (1) for supplying air to the airbag (31) to inflate it and press against the patient's abdomen, a pressure detection component (33) for collecting pressure fluctuations in the airbag (31) to identify the patient's respiratory motion phase, and an airway switching component (34) disposed on the airbag (31) and connected to the vacuum pump (32) and the pressure detection component (33) for connecting the airbag (31) and the vacuum pump (32) for inflation or connecting the pressure detection component (33) for detecting respiratory pressure.

2. The limb fixation and support device for nuclear medicine imaging patients according to claim 1, characterized in that: The movable frame structure (2) includes a carbon fiber U-shaped frame (21) symmetrically arranged on both sides of the movable frame structure (2), an elastic U-shaped clamp (22) fixedly connected to both ends of the carbon fiber U-shaped frame (21) for clamping the edge of the scanning bed (1), and a locking screw (23) that runs horizontally through the elastic U-shaped clamp (22) and is screwed onto the elastic U-shaped clamp (22) for abutting against the edge of the scanning bed (1).

3. The limb fixation and support device for nuclear medicine imaging patients according to claim 2, characterized in that: The locking screw (23) is made of plastic.

4. The limb fixation and support device for nuclear medicine imaging patients according to claim 2, characterized in that: The side of the airbag (31) away from the scanning bed (1) is a non-expandable body (311), and the side of the airbag (31) closer to the scanning bed (1) is an expandable body (312). The two ends of the non-expandable body (311) are respectively fixedly connected to two carbon fiber U-shaped frames (21).

5. The limb fixation and support device for patients undergoing nuclear medicine imaging according to claim 1, characterized in that: The pressure detection component (33) includes a pressure tube (331) connected to the air path switching component (34) and a pressure sensor (332) fixedly connected to the sealed end of the pressure tube (331) for detecting pressure fluctuations in the airbag (31).

6. The limb fixation and support device for nuclear medicine imaging patients according to claim 5, characterized in that: A pressure relief valve (333) is fixedly connected to the pressure pipe (331).

7. The limb fixation and support device for nuclear medicine imaging patients according to claim 5, characterized in that: The gas path switching assembly (34) includes a hose (341) fixedly connected to one side of the airbag (31) and a three-way valve (342) disposed at the end of the hose (341) away from the airbag (31). The hose (341) is fixedly connected to the first interface (343) on the three-way valve (342). The ends of the vacuum pump (32) and the pressure tube (331) away from the pressure sensor (332) are fixedly connected to the second interface (344) and the third interface (345) on the three-way valve (342), respectively.

8. The limb fixation and support device for nuclear medicine imaging patients according to claim 4, characterized in that: The fixed support device also includes a polyester mesh cover (4) disposed on the side of the expansion body (312) near the scanning bed (1) and a detachable part (5) disposed on the polyester mesh cover (4) and the expansion body (312) for disassembling the polyester mesh cover (4).

9. The limb fixation and support device for nuclear medicine imaging patients according to claim 8, characterized in that: The detachable component (5) includes hook and loop fasteners (51) fixedly connected to both sides of the polyester mesh fabric cover (4) and hook and loop fasteners (52) fixedly connected to the edge of the expansion body (312) and adapted to the hook and loop fasteners (51).

Images