Patient bed with weighing function and magnetic resonance device
By setting up airbags and sensors in the patient's bed to sense changes in air pressure to obtain weight, the problem of inconvenient weight acquisition in magnetic resonance imaging is solved, ensuring measurement accuracy and imaging quality, simplifying the process and improving diagnostic efficiency.
Patent Information
- Application Number
- CN202421712213.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-07-18
AI Technical Summary
In the prior art, it is difficult to obtain the patient's weight easily and accurately in magnetic resonance imaging, the electronic sign data is inaccurate and manual weighing is cumbersome, and the electromagnetic interference between the sensor and the magnetic resonance device causes the weight data to be inaccurate, affecting the imaging quality.
The airbag is installed in the patient's bed, and the patient's weight is sensed by the air pressure changes in the airbag. The sensor is located away from the magnetic field of the magnetic resonance device. The tracheal design adapts to the movement of the bed, reduces vibration errors, and uses guide components to ensure that the airbag is subjected to uniform force.
It achieves rapid and accurate acquisition of patient weight, simplifies examination procedures, improves diagnostic efficiency, and avoids electromagnetic interference to affect imaging quality and measurement accuracy.
Smart Images
Figure CN223068519U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of magnetic resonance patient beds, and particularly to a patient bed with a weighing function and a magnetic resonance device. Background Art
[0002] In the field of medical diagnosis, magnetic resonance imaging has become an important means for clinical diagnosis and treatment evaluation due to its advantages of non-invasiveness, no radiation damage, and high soft tissue resolution. In magnetic resonance imaging, the energy level of radio frequency pulses and scanning transmission parameters need to be adjusted according to the patient's weight data. In related technologies, electronic medical record sign data or manual weighing is generally used to obtain the patient's weight data. The patient's weight data in the electronic medical record may have information lag and cannot reflect the patient's current weight. Manual weighing and manual input before the examination are not only cumbersome and time-consuming, but also prone to introducing human errors. Utility Model Content
[0003] An embodiment of this application provides a patient bed with a weighing function, which can solve the problem of difficult and accurate acquisition of the patient's weight in magnetic resonance imaging detection.
[0004] In a first aspect, an embodiment of this application provides a patient bed with a weighing function. The patient bed is used for a magnetic resonance device and includes: a bed frame, a bed body, a tracheal assembly, and a sensor. The bed body is slidably arranged on the bed frame along a preset direction. The bed body includes an airbag and a backrest plate for the patient to lean on. The backrest plate leans on the airbag so that the backrest plate can float up and down in the direction of gravity. The tracheal assembly includes a trachea and a first connection part, a second connection part, and a third connection part installed on the trachea. The first connection part is installed on the bed body to connect the trachea with the airbag. The second connection part is installed on the bed frame. The trachea has a tail away from the airbag. The third connection part is used to install the tail of the trachea at a position away from the magnetic field of the magnetic resonance device. The sensor is arranged at the tail of the trachea. The sensor is used to sense the pressure in the trachea, so as to sense the air pressure change in the airbag and generate a weighing signal when the patient leans on the backrest plate, and use the weighing signal to obtain the weight of the patient.
[0005] In some of these embodiments, the bed body has a first position and a second position. The bed body reciprocally moves between the first position and the second position relative to the bed frame along the preset direction. The bed body includes a head end and a tail end. The first connection part is installed at the tail end. In the first position of the bed body, the second connection part is located on the side of the first connection part facing the head end. Along the preset direction, the distance from the second connection part to the head end is T1. In the second position of the bed body, along the preset direction, the distance from the second connection part to the head end is T2, where T1 < T2.
[0006] In some of these embodiments, the trachea includes: a first pipe body connected between the first connection portion and the second connection portion, the first pipe body being configured to be movable along with the reciprocating movement of the bed body; and a second pipe body connected between the second connection portion and the third connection portion, the second pipe body including the tail portion of the trachea.
[0007] In some of these embodiments, the patient bed further includes a drag chain, one end of the drag chain is connected to the bed body, the other end is connected to the bed frame, and the drag chain is sleeved outside the first pipe body.
[0008] In some of these embodiments, the bed body further includes a bottom plate, the bottom plate is slidably connected to the bed frame and is configured to reciprocate relative to the bed frame; the bottom plate has a mounting groove, the airbag is installed in the mounting groove and connected to the bottom wall surface of the mounting groove, and the supporting plate is connected to a side of the airbag away from the bottom wall surface of the mounting groove.
[0009] In some of these embodiments, the bed body further includes a guiding assembly, the guiding assembly includes a first guiding member and a second guiding member, the first guiding member is disposed on the bottom plate, the second guiding member is disposed on the supporting plate, and the first guiding member is slidably connected to the second guiding member along the direction of gravity to guide the supporting plate to float up and down relative to the bottom plate in the direction of gravity.
[0010] In some of these embodiments, there are multiple groups of the guiding assemblies, and the multiple groups of guiding assemblies are arranged at intervals along the length direction of the bed body; the airbag has a plurality of mounting holes, and at least part of the guiding assemblies are respectively passed through the plurality of mounting holes to define the positions of the airbag relative to the bottom plate and the supporting plate.
[0011] In some of these embodiments, the bed body further includes a heat preservation layer, the heat preservation layer is connected to the supporting plate and is disposed on a side of the supporting plate close to the airbag.
[0012] In some of these embodiments, the airbag has two relatively arranged supporting main walls and a folding portion connected between the two supporting main walls, and the three together enclose an air cavity communicating with the trachea; one of the supporting main walls is connected to the supporting plate, and the other supporting main wall is connected to the bottom plate; the folding portion includes a plurality of folding units periodically arranged along the direction in which the two supporting main walls are relatively arranged, and each folding unit includes a first folding wall and a second folding wall, one side of the first folding wall and the second folding wall are connected to each other, and the other side can be opened at an angle to each other.
[0013] In a second aspect, an embodiment of the present application provides a magnetic resonance apparatus, including a magnet unit and the patient bed as described above. The bed body slides relative to the bed frame along the preset direction to move a patient into the imaging space of the magnet unit for nuclear magnetic detection.
[0014] Based on the patient bed and the magnetic resonance apparatus with a weighing function according to the embodiments of the present application, the patient bed in the present application has a weighing function and can accurately and conveniently provide patient weight data for magnetic resonance imaging, where: The bearing plate bears on the airbag, the airbag is connected to the air pipe, and the sensor is arranged at the tail of the air pipe. In this way, after the patient bears on the bearing plate, the sensor senses the air pressure change in the airbag by sensing the pressure in the air pipe, so as to automatically obtain the patient's weight, simplifying the inspection process and helping to improve the diagnosis efficiency; Through the third connecting part and the air pipe, the sensor is arranged at a position far from the magnetic field of the magnetic resonance apparatus to avoid the possible electromagnetic interference generated by the sensor from affecting the nuclear magnetic imaging quality, ensuring the clarity of the magnetic resonance imaging and the reliability of the diagnosis. At the same time, the magnetic field is avoided from affecting the detection accuracy of the sensor, ensuring the accuracy of obtaining the patient's weight data. In view of the working characteristics of the reciprocating movement of the bed body of the patient bed, by setting the second connecting part, at least part of the air pipe is installed on the bed frame, and the part of the air pipe connected between the first connecting part and the second connecting part can move with the reciprocating movement of the bed body to adapt to the dynamic change of the bed body. The part of the air pipe connected between the second connecting part and the third connecting part remains relatively stationary, reducing the error caused by vibration or displacement of the sensor and further ensuring the stability of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained according to these drawings.
[0016] Figure 1 It is a schematic structural diagram of a patient bed according to an embodiment of the present application;
[0017] Figure 2 It is a schematic structural diagram of a bed body according to an embodiment of the present application;
[0018] Figure 3 It is a top view schematic diagram of a bed body according to an embodiment of the present application;
[0019] Figure 4 It is a partial enlarged schematic diagram of an airbag according to an embodiment of the present application;
[0020] Figure 5 It is another schematic structural diagram of an airbag and an air pipe according to an embodiment of the present application;
[0021] Figure 6 For Figure 5 a partially enlarged schematic view of A in
[0022] Figure 7 a schematic structural view of a guiding component according to an embodiment of the present application;
[0023] Figure 8 a schematic view of a sensor according to an embodiment of the present application;
[0024] Reference numerals:
[0025] 1. Patient bed; 2. Magnet unit; 10. Bed frame; 20. Bed body; 30. Trachea assembly; 40. Sensor; 21. Base plate; 22. Airbag; 23. Resting plate; 24. Guiding component; 25. Thermal insulation layer; 210. Installation groove; 211. Insertion interface; 220. Installation hole; 221. Support main wall; 222. Folding part; 223. Connecting side wall; 224. Air inlet; 225. Seal; 241. First guiding member; 242. Second guiding member; 31. Trachea; 32. First connecting part; 33. Second connecting part; 34. Third connecting part; 311. First pipe body; 312. Second pipe body. Detailed implementation manners
[0026] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0027] In magnetic resonance imaging, the weight of a patient is an important parameter for the operation of a magnetic resonance device. Currently, magnetic resonance devices often obtain the weight of a patient in an indirect manner. For example, reading the electronic medical record signs of the patient, or weighing the patient before the examination and then manually inputting the weight into the magnetic resonance device by a radiologist. The weight of a patient is affected by multiple factors and may fluctuate. For example, the weight of a patient may change significantly as the disease progresses. Therefore, the electronic medical record signs are difficult to accurately reflect the weight of the patient during the examination. The method of weighing and manually inputting has a cumbersome operation process, increasing the burden on the patient and the doctor, and is also prone to introducing human errors.
[0028] In the related art, some medical beds integrate a weighing function. By arranging sensors on the bed board, the bed bottom or other positions, and combining with a force transmission structure to sense and obtain the weight data of the patient. Due to the electromagnetic interference between the sensors and the magnetic field of the magnetic resonance device, it may not only lead to inaccurate weight data, but also seriously damage the magnetic resonance imaging quality, bringing potential risks to clinical diagnosis. Such medical beds are difficult to adapt to magnetic resonance devices.
[0029] To solve the above technical problems, the present application proposes a patient bed and a magnetic resonance device with a weighing function. An airbag is provided inside the bed body, and a sensor is provided in the trachea connected to the airbag. The sensor senses the pressure in the trachea, and then senses the pressure change in the airbag to obtain the weight of the patient. The sensor of the present application is arranged at a position far from the magnetic field of the magnetic resonance device, avoiding electromagnetic interference, and can quickly and accurately obtain the weight of the patient, providing relevant parameters for magnetic resonance imaging detection, without additional weighing steps, simplifying the patient examination process, and helping to improve the diagnosis and treatment efficiency.
[0030] Please refer to Figure 1 , the embodiment of the present application provides a patient bed 1 with a weighing function, Figure 1 which is a schematic structural diagram of a patient bed 1 according to an embodiment of the present application. The patient bed 1 includes a bed frame 10, a bed body 20, a trachea assembly 30, and a sensor 40.
[0031] The bed frame 10 is one of the main structures of the patient bed 1, responsible for supporting the bed body 20 and the patient thereon. The bed body 20 is slidably arranged on the bed frame 10 along a preset direction. The bed body 20 can support the patient and move along the preset direction under the control of an operator to accurately move the patient to the magnetic field center of the magnetic resonance device. Generally, the preset direction is the length direction of the bed body 20.
[0032] Please refer to Figure 1 - Figure 2 , Figure 2 which is a schematic structural diagram of a bed body 20 according to an embodiment of the present application. In the embodiment of the present application, the bed body 20 includes a bottom plate 21, an airbag 22, and a supporting plate 23. The bottom plate 21 is slidably connected to the bed frame 10, and the bottom plate 21 is configured to reciprocate relative to the bed frame 10. The bottom plate 21 has an installation groove 210. The airbag 22 is installed in the installation groove 210 and connected to the bottom wall surface of the installation groove 210. The supporting plate 23 is connected to the side of the airbag 22 away from the bottom wall surface of the installation groove 210. The supporting plate 23 bears on the airbag 22. When the patient bears on the supporting plate 23, the supporting plate 23 can disperse the weight of the patient over the entire area of the supporting plate 23, and then transfer the weight downward to the airbag 22. The airbag 22 is squeezed, causing a change in its thickness in the direction of gravity. Therefore, the supporting plate 23 can float up and down in the direction of gravity, and the pressure change in the airbag 22 can reflect the change in the weight it bears.
[0033] As Figure 3 shown, Figure 3It is a top view schematic diagram of a bed body 20 according to an embodiment of the present application. In the embodiment of the present application, the bearing area of the bearing plate 23 should be large enough to ensure that the patient can obtain sufficient support and comfort. At the same time, the size of the bearing plate 23 also needs to take into account the structural strength of the bottom plate 21. The minimum distance between the outer edge of the bottom plate 21 and the outer edge of the bearing plate 23 is D1, where D1 satisfies: 5mm ≤ D1 ≤ 45mm. Specifically, the bottom plate 21 also has an insertion interface 211, and external devices such as receiving coils can be electrically connected and communicatively connected to the patient bed 1 through the insertion interface 211. The minimum distance from the outer edge of the bearing plate 23 to the insertion interface 211 is D2, where D2 satisfies: 15mm ≤ D2 ≤ 65mm. If D2 < 15mm, the bearing plate 23 is too close to the insertion interface 211, and it is easy for the patient to bump into the insertion interface 211 and external devices when lying on the bearing plate 23, posing a safety hazard; if D2 > 65mm, the bearing plate 23 is too far from the insertion interface 211, the design of the bed body 20 is not compact enough, and even the overall size of the bed body 20 may need to be increased, affecting the overall layout of the patient bed 1. In a specific implementation, if a wiring channel or other channels need to be provided inside the bed body 20, avoidance holes can be opened in the airbag 22 and the bearing plate 23.
[0034] The airbag 22 is detachably connected to the bottom plate 21 to facilitate the maintenance and replacement of the airbag 22. Optionally, the airbag 22 can be adhered to the installation groove 210 of the bottom plate 21 by Velcro, or can be connected to the bottom plate 21 by other detachable connection methods. In actual applications, a protective plate is provided on the side of the airbag 22 away from the bearing plate 23. The airbag 22 is adhered to the protective plate, and the protective plate is connected to the bottom plate 21 by Velcro or other connecting devices. The protective plate is a rigid thin plate, and its main function is to provide an additional protective layer, which can prevent the airbag 22 from being damaged by force during disassembly and facilitate subsequent maintenance.
[0035] As Figure 4 shown, Figure 4It is a partially enlarged schematic diagram of an airbag 22 according to an embodiment of the present application. In an embodiment of the present application, the airbag 22 includes two supporting main walls 221 and a folding part 222. The two supporting main walls 221 are arranged oppositely, and the folding part 222 is connected between the two supporting main walls 221. The three enclose and define an air cavity communicating with the trachea 31. Among them, one supporting main wall 221 is connected to the bearing plate 23, and the other supporting main wall 221 is connected to the bottom plate 21. Specifically, the folding part 222 includes a plurality of folding units arranged periodically along the direction in which the two supporting main walls 221 are oppositely arranged. The folding unit includes a first folding wall and a second folding wall. One side of the first folding wall and the second folding wall are connected to each other, and the other side can open at an angle to each other, that is, the folding part 222 is in a bellows shape. When the gas volume inside the airbag 22 increases, the folding part 222 can gradually unfold to form a stable supporting structure, and when the gas volume inside the airbag 22 decreases, the folding part 222 can fold. In this way, within the allowable range, the change in the gas volume in the airbag 22 will cause the folding part 222 to fold or unfold along the direction in which the two supporting main walls 221 are oppositely arranged, rather than expanding outward. In this way, the risk of frictional damage between the deformed airbag 22 and the side wall surface of the installation groove 210 is reduced.
[0036] As Figure 5 - Figure 6 shown, Figure 5 It is a schematic structural diagram of another airbag 22 and a trachea assembly 30 according to an embodiment of the present application, Figure 6 is Figure 5 the enlarged cross-sectional view of A in. In some other embodiments, the four sides of the airbag 22 can also be straight walls. The airbag 22 includes two supporting main walls 221 arranged oppositely, and a connecting side wall 223 connected between the two supporting main walls 221. In this case, during initial installation, the connecting side wall 223 of the airbag 22 is spaced from the side wall surface of the installation groove 210 to leave a deformation space for the airbag 22.
[0037] In an embodiment of the present application, the airbag 22 includes an air inlet 224. Gas is pre-filled into the airbag 22 through the air inlet 224 to maintain the gas pressure inside the airbag 22. Among them, the air inlet 224 is configured as a one-way air nozzle to prevent leakage from the air inlet 224 after the airbag 22 is pressurized. Preferably, the airbag 22 further includes a seal 225, and the seal 225 is arranged at the air inlet 224 to further seal the air inlet 224 after the pre-filling of the gas is completed.
[0038] Furthermore, the amount of pre-charged gas in the airbag 22 should be controlled to ensure that the deformation of the airbag 22 after bearing the load is within a controllable range. In specific implementation, relevant technicians can control the amount of pre-charged gas by controlling the initial gas pressure P0 of the airbag 22 after pre-charging the gas. Among them, the pre-charged gas should be a safe and harmless gas to avoid casualties caused by internal gas leakage after the airbag 22 or the air pipe 31 is damaged. The initial gas pressure P0 is determined according to the type of pre-charged gas.
[0039] It can be understood that the airbag 22 provides flexible support for the bearing plate 23, and the deformation of the airbag 22 is closely related to the force on the bearing plate 23. The change in the patient's posture on the bearing plate 23 is very likely to cause uneven force on the bearing plate 23 and the airbag 22, thereby causing the bearing plate 23 to tilt and resulting in damage to the patient and the airbag 22. As Figure 7 shown, Figure 7 FIG. 7 is a schematic structural diagram of a guiding component 24 according to an embodiment of the present application. To avoid the tilting of the bearing plate 23, the bed body 20 further includes a guiding component 24. The guiding component 24 includes a first guiding member 241 and a second guiding member 242. The first guiding member 241 is disposed on the bottom plate 21, and the second guiding member 242 is disposed on the bearing plate 23. The first guiding member 241 is slidably connected to the second guiding member 242 along the direction of gravity. In this way, the guiding component 24 can limit the moving direction of the bearing plate 23, so that the bearing plate 23 floats relative to the bottom plate 21 in the direction of gravity, avoiding the tilting of the bearing plate 23, ensuring the safety of the patient during use, reducing the measurement error caused by uneven force on the airbag 22, and reducing the risk of rupture of the airbag 22 due to excessive local pressure.
[0040] In the embodiment of the present application, the cooperation between the first guiding member 241 and the second guiding member 242 should not be too tight to avoid excessive friction between the two, so that part of the force exerted by the patient on the bearing plate 23 is offset and cannot be completely transmitted downward to the airbag 22, resulting in deviation in the sensed body weight data. Of course, relevant technicians can pre-measure relevant data such as the friction coefficient between the first guiding member 241 and the second guiding member 242 and introduce the relevant data into the calculation to eliminate this part of the error.
[0041] Optionally, in the guiding component 24 of the embodiment of the present application, the outer contour of the first guiding member 241 and the second guiding member 242 can be circular, square or other shapes, which are not limited herein.
[0042] When the bearing plate 23 is subjected to a force deviating from the direction of gravity, the guiding assembly 24 will generate a reaction force on the bearing plate 23 to counteract the above-mentioned force, resulting in stress concentration at the connection between the bearing plate 23 and the second guiding member 242 and at the connection between the bottom plate 21 and the first guiding member 241. In order to ensure the stability of the bearing plate 23 moving along the direction of gravity and reduce the local stress concentration of the bearing plate 23 and the bottom plate 21, the bed body 20 includes multiple groups of guiding assemblies 24, and the multiple groups of guiding assemblies 24 are arranged at intervals along the length direction of the bed body. The airbag 22 has multiple mounting holes 220, and the multiple mounting holes 220 are arranged at intervals along the central axis of the airbag 22. The multiple groups of guiding assemblies 24 are respectively passed through the multiple mounting holes 220, so as to define the relative positions of the airbag 22 with respect to the bottom plate 21 and the bearing plate 23, and prevent the airbag 22 from shifting during the movement of the bed body 20. It should be noted that the central axis of the airbag 22 is the connecting line of the midpoints in the width direction of the airbag 22.
[0043] Optionally, in other embodiments of the present application, the peripheral side of the airbag 22 is spaced from the mounting groove 210. The airbag 22 has multiple mounting holes 220, and the multiple mounting holes 220 are arranged at intervals along the central axis of the airbag 22. A part of the multiple groups of guiding assemblies 24 are respectively passed through the multiple mounting holes 220 to fix the relative positions of the airbag 22, the bottom plate 21 and the bearing plate 23, and the other part are evenly distributed around the bottom plate 21 and the bearing plate 23 and are spaced from the airbag 22 to ensure that the bearing plate 23 is evenly stressed after bearing the patient, and reduce the possibility of skew and vibration.
[0044] In the guiding assembly 24 of the embodiment of the present application, the sliding distance of the second guiding member 242 relative to the first guiding member 241 is L1, and L1 satisfies: L1≥2mm. Wherein, the value of L1 determines the floating range of the bearing plate 23 along the direction of gravity. If L1<2mm, the floating distance of the bearing plate 23 along the direction of gravity is too small, and the load range that the airbag 22 can effectively sense is also small. It should be noted that the upper limit value of L1 depends on the maximum load of the airbag 22.
[0045] The body temperature of the patient may cause the local temperature of the airbag 22 to rise, resulting in the expansion of the volume of some gas, and further causing unnecessary pressure changes in the airbag 22, introducing errors into the weight measurement of the patient. In a specific implementation, in order to avoid the influence of the patient's body temperature on the accuracy of weight measurement, the bed body 20 further includes a heat preservation layer 25, and the heat preservation layer 25 is connected to the bearing plate 23 and is arranged on the side of the bearing plate 23 close to the airbag 22.
[0046] In the embodiment of the present application, the bed body 20 needs to reciprocate relative to the bed frame 10 along a preset direction to carry the patient to reach the magnetic field center to complete magnetic resonance scanning. It should be noted that in order to keep the sensor 40 away from the magnetic field, the trachea 31 is relatively long. The trachea 31 is connected and communicated with the airbag 22 in the bed body 20. If the whole trachea 31 reciprocates with the bed body 20, the movement of the trachea 31 occupies a large space, and the sensor 40 at its end is greatly affected by vibration. Therefore, a reasonable arrangement mode of the trachea 31 needs to be designed to match the movement mode of the bed body 20.
[0047] Furthermore, a part of the trachea 31 is configured to move with the reciprocating movement of the bed body 20, and the other part is configured to be relatively stationary to provide a stable installation environment for the sensor 40. Specifically, the trachea assembly 30 includes the trachea 31 and the first connecting portion 32, the second connecting portion 33 and the third connecting portion 34 installed on the trachea 31. The first connecting portion 32 is installed on the bed body 20 to communicate the trachea 31 with the airbag 22. The second connecting portion 33 is installed on the bed frame 10. The third connecting portion 34 is arranged at a position away from the magnetic field of the magnetic resonance device. Among them, the trachea 31 has a tail away from the airbag 22, and the third connecting portion 34 is used to install the tail of the trachea 31 at a position away from the magnetic field of the magnetic resonance device, and the sensor 40 is arranged at the tail of the trachea 31.
[0048] The magnetic resonance device further includes a magnet unit 2. The bed body 20 has a first position away from the magnet unit 2 and a second position close to the magnet unit 2. Among them, when the bed body 20 is in the first position, the patient can lie on the bed body 20. Under the control of the operator, the bed body 20 reciprocates relative to the bed frame 10 between the first position and the second position along a preset direction to perform magnetic resonance scanning. The bed body 20 includes a head end and a tail end, and the first connecting portion 32 is installed at the tail end. In the first position of the bed body 20, the second connecting portion 33 is located on the side of the first connecting portion 32 facing the head end. In this way, a bending section is formed between the first connecting portion 32 and the second connecting portion 33, and the bending section moves with the movement of the bed body 20 between the first position and the second position. Preferably, the length of the pipe body between the first connecting portion 32 and the second connecting portion 33 matches the stroke of the bed body 20 to avoid pulling on the trachea 31 during the movement of the bed body 20.
[0049] It can be understood that the closer the second connecting portion 33 is to the magnet unit 2, the longer the length of the trachea 31 needs to be configured to set the sensor 40 at a position away from the magnetic field, which is not conducive to detection. Along the preset direction, in the first position of the bed body 20, the distance from the second connecting portion 33 to the head end is T1, and in the second position of the bed body 20, the distance from the second connecting portion 33 to the head end is T2, where T1 < T2, that is, in the preset direction, the head end is closer to the magnet unit 2.
[0050] The trachea 31 further includes a first pipe body 311 and a second pipe body 312. The first pipe body 311 is connected between the first connection part 32 and the second connection part 33, and the second pipe body 312 is connected between the second connection part 33 and the third connection part 34. The second pipe body 312 includes the tail part of the above-mentioned trachea 31. Among them, the first pipe body 311 is configured to be able to move along with the reciprocating movement of the bed body 20. It can be understood that if the bending degree of the bending section in the first pipe body 311 is too large, it will cause uneven pressure in the trachea assembly 30, thereby affecting the measurement result of the sensor 40. The patient bed 1 further includes a drag chain. One end of the drag chain is connected to the bed body 20, and the other end is connected to the bed frame 10. The drag chain is sleeved outside the first pipe body 311 to provide protection for the first pipe body 311 to prevent it from being worn, squeezed or pulled during the movement of the bed body 20, thereby extending the service life of the first pipe body 311. Of course, in a specific implementation, the drag chain can also be replaced with other bending protection structures. For example, a hard coating layer is added outside the first pipe body 311 to enhance the bending resistance of the first pipe body 311.
[0051] In practical applications, the trachea 31 is relatively long. In order to reduce the influence of flow path loss on the measurement accuracy, the trachea 31 is hermetically connected to the airbag 22, and the end of the trachea 31 far from the airbag 22 is in a sealed state. In this way, a sealed cavity is formed inside the airbag 22 and the trachea 31 to ensure the consistency of the measurement environment.
[0052] Please refer to Figure 8 , Figure 8 which is a schematic diagram of a sensor 40 according to an embodiment of the present application. The sensor 40 is arranged at the tail of the trachea 31. The sensor 40 is used to sense the pressure in the trachea 31, so as to sense the air pressure change of the airbag 22 and generate a weighing signal when the patient leans on the bearing plate 23, and use the weighing signal to obtain the weight of the patient. In an embodiment of the present application, the sensor 40 adopts a pressure sensor, and the third connection part 34 is locally thinned to reduce the hysteresis effect caused by the material thickness, so that the pressure sensor can better sense the pressure change in the trachea 31 and improve the real-time performance and accuracy of the measurement.
[0053] Optionally, in another embodiment of the present application, at least one strain film is arranged at the tail of the trachea 31 by a composite process, and the sensor 40 can also adopt a strain sensor. When the pressure in the trachea 31 changes, the strain film undergoes a small deformation, and the strain sensor calculates the pressure change by sensing the small deformation of the strain film.
[0054] In the embodiment of the present application, inside the temperature- and humidity-controlled shielded room, on a relatively short time scale, the overall airtight airbag 22 - trachea 31 can be regarded as a closed container with a constant temperature and a constant airtight quantity. Along the plane parallel to the surface of the bearing plate 23, the airbag 22 is regarded as an ideal body with a constant cross-sectional area S. When the patient does not lean on the bearing plate 23, the initial gas pressure in the airbag 22 is P0, and along the gravity direction, the initial distance between the thermal insulation layer 25 and the bottom plate 21 is L0. After the patient leans on the bearing plate 23, the pressure of the load gas in the airbag 22 is P2, and along the gravity direction, the load distance between the thermal insulation layer 25 and the bottom plate 21 is L2. The thickness of the protective plate is t. According to the ideal gas relationship, we have:
[0055] P0×S×(L0 - t) = n×T×R = C = P2×S×(L2 - t);
[0056] Where C is a constant.
[0057] From this, the load force ΔF generated by the patient's weight can be calculated: ΔF = (P2 - P0)×S, and then the patient's weight can be calculated.
[0058] Generally speaking, the embodiment of the present application integrates the weighing function into the patient bed, provides a weighing structure applicable to the magnetic resonance device 1. By arranging the airbag 22 inside the bed body 20, the air pressure change in the airbag 22 when the patient leans on the bed body 20 is used to sense the patient's weight. Through the trachea 31 connected to the airbag 22, the sensor 40 is arranged at a position far from the magnetic field of the magnetic resonance device, avoiding electromagnetic interference between the sensor 40 and the magnetic resonance device, which affects the magnetic resonance imaging quality and the measurement result of the sensor 40. For the working mode of the reciprocating movement of the bed body 20, in the trachea 31, the first pipe body 311 is configured to move along with the reciprocating movement of the bed body 20 to adapt to the dynamic change of the bed body 20, and the second pipe body 312 can remain relatively stationary. The sensor 40 is arranged on the second pipe body 312 (the tail of the trachea 31), effectively reducing the measurement error caused by vibration or displacement, and further ensuring the stability of the measurement.
[0059] The embodiment of the present application also provides a magnetic resonance device. The magnetic resonance device includes a magnet unit 2, the patient bed 1 as described above, and a receiving coil. The magnet unit 2 is used to generate a stable magnetic field to provide a necessary magnetic field environment for nuclear magnetic imaging. The patient bed 1 includes a bed frame 10 and a bed body 20. The bed frame 10 is connected to the magnet unit 2, and the bed body 20 is slidably connected to the bed frame 10 along a preset direction. The bed body 20 can carry the patient and move the patient along the preset direction into the imaging space of the magnet unit 2 for nuclear magnetic detection. The receiving coil is usually installed on the patient bed 1 and can enter the magnet unit 2 together with the patient bed 1. The receiving coil can receive the excited magnetic resonance signal and convert it into an electrical signal for transmission to a computer for processing and image reconstruction.
[0060] In the embodiments of the present application, by using the patient bed 1 with the weighing function described above, the weight of the patient can be accurately and conveniently obtained without affecting magnetic resonance imaging, providing a basis for setting relevant parameters for magnetic resonance examination, and can simplify the examination process, helping to improve the diagnosis efficiency.
[0061] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0062] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.
Claims
1. A patient bed with a weighing function, the patient bed being for a magnetic resonance apparatus, characterized in that, Comprising: A bed frame; A bed body, slidably disposed on the bed frame along a preset direction. The bed body includes an airbag and a support plate for a patient to lean on. The support plate leans on the airbag so that the support plate can float up and down in the direction of gravity; An air tube assembly, including an air tube and a first connection part, a second connection part, and a third connection part installed on the air tube. The first connection part is installed on the bed body so that the air tube communicates with the airbag. The second connection part is installed on the bed frame. The air tube has a tail end away from the airbag. The third connection part is used to install the tail end of the air tube at a position away from the magnetic field of the magnetic resonance device; and A sensor, disposed at the tail end of the air tube. The sensor is used to sense the pressure in the air tube, so as to sense the air pressure change in the airbag and generate a weighing signal when the patient leans on the support plate, and use the weighing signal to obtain the weight of the patient.
2. The patient bed according to claim 1, wherein The bed body has a first position and a second position, and the bed body reciprocally moves between the first position and the second position relative to the bed frame along the preset direction; The bed body includes a head end and a tail end. The first connection part is installed at the tail end. In the first position of the bed body, the second connection part is located on the side of the first connection part facing the head end. Along the preset direction, the distance from the second connection part to the head end is T1. In the second position of the bed body, along the preset direction, the distance from the second connection part to the head end is T2, wherein T1 < T2.
3. The patient bed according to claim 2, characterized in that, The air tube includes: A first tube body, connected between the first connection part and the second connection part. The first tube body is configured to be able to move with the reciprocal movement of the bed body; and A second tube body, connected between the second connection part and the third connection part. The second tube body includes the tail end of the air tube.
4. The patient bed according to claim 3, wherein The patient bed further includes a cable carrier. One end of the cable carrier is connected to the bed body, and the other end is connected to the bed frame. The cable carrier is sleeved outside the first tube body.
5. The patient bed according to claim 1, characterized in that, The bed body further includes a bottom plate, which is slidably connected to the bed frame and is configured to reciprocate relative to the bed frame; The bottom plate has a mounting groove. The airbag is installed in the mounting groove and connected to the bottom wall surface of the mounting groove. The support plate is connected to the side of the airbag away from the bottom wall surface of the mounting groove.
6. The patient bed according to claim 5, characterized in that, The bed body further includes a guiding assembly. The guiding assembly includes a first guiding member and a second guiding member. The first guiding member is disposed on the bottom plate, and the second guiding member is disposed on the support plate. The first guiding member is slidably connected to the second guiding member along the direction of gravity to guide the support plate to float up and down relative to the bottom plate in the direction of gravity.
7. The patient bed according to claim 6, characterized in that, There are multiple groups of the guiding assemblies, and the multiple groups of guiding assemblies are arranged at intervals along the length direction of the bed body; The airbag has multiple mounting holes, and at least part of the guiding assemblies pass through the multiple mounting holes in one-to-one correspondence to define the position of the airbag relative to the bottom plate and the support plate.
8. The patient bed according to claim 1, wherein, The bed body further includes a heat-insulating layer, which is connected to the supporting plate and is disposed on the side of the supporting plate close to the airbag.
9. The patient bed according to claim 5, characterized in that, The airbag has two relatively arranged supporting main walls and a folding part connected between the two supporting main walls, and the three enclose and define an air cavity communicated with the air pipe; one of the supporting main walls is connected to the supporting plate, and the other supporting main wall is connected to the bottom plate; The folding part includes a plurality of folding units periodically arranged along the direction in which the two supporting main walls are relatively arranged. Each folding unit includes a first folding wall and a second folding wall. One side of the first folding wall and the second folding wall are connected to each other, and the other side can open at an angle to each other.
10. A magnetic resonance apparatus, characterized in that, Comprising: a magnet unit, and The patient bed according to any one of claims 1-9, wherein the bed body slides relative to the bed frame along the preset direction to move the patient to the imaging space of the magnet unit for nuclear magnetic detection.