Four-limb limiting and fixing device for CT (Computed Tomography)

Abstract

The invention belongs to the field of four-limb limiting and fixing for CT, and particularly relates to a four-limb limiting and fixing device for CT, which comprises a lying plate, a positioning device and a fixing device, the positioning device comprises a first sliding block, the first sliding block is located in the first groove, the first sliding block is slidably connected with the first groove, a sliding seat is arranged at the top of the first sliding block, a second sliding block is slidably arranged at the top of the sliding seat, and a plurality of second positioning holes are formed in the top of the sliding seat; self-locking structures are arranged in the first sliding block and the second sliding block; a first sliding block, a sliding seat, a second sliding block, a first positioning hole, a second positioning hole and a self-locking structure are arranged in the positioning device, so that when positioning is needed, the self-locking structure is unlocked, and then the first sliding block and the second sliding block are respectively slid to designated positions; and then a spring bolt of a self-locking structure is respectively clamped with the first positioning hole and the second positioning hole to realize positioning.

Description

Technical Field

[0001] The present invention belongs to the field of limb limiting and fixing for CT, and specifically relates to a limb limiting and fixing device for CT. Background Art

[0002] CT (Computed Tomography), namely computerized tomography, is a medical imaging technology. It uses an X-ray beam to perform tomographic scans on the human body and generates detailed images of the internal structure of the body with the aid of computer processing. CT scans are widely used in the diagnosis of various diseases due to their fast and clear imaging capabilities.

[0003] The existing CT limb fixation devices mainly have the following disadvantages:

[0004] 1. The adjustable degree of freedom is relatively low. Since the body types of different patients undergoing CT scans vary, with different heights, weights, and builds, and most CT fixation devices do not have an adjustable degree of freedom, many CT devices cannot fit well with patients.

[0005] 2. Fixing is time-consuming. Since CT examination is a popular detection instrument and people often need to queue up for detection, the existing CT limb fixation devices are relatively troublesome and time-consuming to fix, resulting in a reduction in detection efficiency. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve the problems of relatively low adjustable degree of freedom, since the body types of different patients undergoing CT scans vary, with different heights, weights, and builds, and most CT fixation devices do not have an adjustable degree of freedom, resulting in many CT devices not being able to fit well with patients, and fixing being time-consuming. Since CT examination is a popular detection instrument and people often need to queue up for detection, and the existing CT limb fixation devices are relatively troublesome and time-consuming to fix, resulting in a reduction in detection efficiency.

[0007] The technical solution adopted by the present invention to solve its technical problems is: to provide a limb limiting and fixing device for CT, including: a lying board, a positioning device, and a fixing device;

[0008] The lying board includes a bottom board, and the four corners of the bottom board are provided with first grooves, and the bottom of the first grooves is provided with a plurality of first positioning holes;

[0009] The positioning device includes a first slider. The first slider is located inside a first groove and is slidably connected to the first groove. A sliding seat is provided on the top of the first slider. A second slider is slidably provided on the top of the sliding seat. A number of second positioning holes are provided on the top of the sliding seat. A self-locking structure is provided inside the first slider and the second slider. A locking tongue is provided inside the self-locking structure. The locking tongue of the self-locking structure inside the first slider is in clearance fit with a number of the first positioning holes. The locking tongue of the self-locking structure inside the second slider is in clearance fit with the second positioning holes;

[0010] The fixing device includes a strap. The strap is located on the top of the second slider. A lock ring is fixedly provided at one end of the strap. A through fourth sliding cavity is provided on one side of the lock ring. The strap is slidably connected to the fourth sliding cavity. A first ratchet tooth is provided on the inner side of the strap. The first ratchet tooth is a concave ratchet tooth. A fifth sliding cavity is provided on the side of the fourth sliding cavity close to the first ratchet tooth. A second ratchet tooth is slidably provided inside the fifth sliding cavity. The second ratchet tooth is engaged with the first ratchet tooth. A spring piece is provided on the side of the second ratchet tooth away from the first ratchet tooth.

[0011] During operation, first, the patient lies on the bottom plate. Then, the first sliders at the four corners on the top of the bottom plate are slid, so that the first sliders move to the vicinity of the arm to be fixed. The first sliders drive the sliding seat and the second sliders to move synchronously. Then, the locking tongue of the self-locking structure inside the first slider is engaged with one of the first positioning holes, so as to realize the longitudinal fixation of the patient's limbs, enabling the device to adapt to people of different heights. Then, the second sliders are slid again to fix the patient's limbs to a relatively comfortable position. Then, the locking tongue of the self-locking structure inside the second slider is engaged with one of the second positioning holes, so as to realize the transverse fixation of the patient's limbs, enabling the device to adapt to people of different body builds. Then, the strap is put on the patient's limbs. Then, the end of the strap away from the lock ring is passed through the fourth sliding cavity. Since the first ratchet tooth and the second ratchet tooth are engaged with each other, and due to the setting of the spring piece, the inclined surface of the first ratchet tooth will slide along the inclined surface of the second ratchet tooth. At the same time, the second ratchet tooth squeezes the spring piece to slide to the side of the second ratchet tooth away from the first ratchet tooth. When the patient adjusts to the appropriate tightness, since the first ratchet tooth and the second ratchet tooth are engaged with each other, the strap can only move unidirectionally inside the fourth sliding cavity, thus realizing the self-locking of the lock ring to the strap.

[0012] Preferably, first chutes are provided on both sides of the first groove. First convex blocks are provided on both sides of the first slider. The first convex blocks are slidably connected to the first chutes. Second chutes are provided on both sides of the sliding seat. Second convex blocks are provided on both sides of the second slider. The second convex blocks are slidably connected to the second chutes.

[0013] During operation, the first bump is slidably connected to the first chute, enabling the first bump to slide within the first chute. With the guidance and limitation of the first chute, the first slider has only one degree of freedom in one direction and will not disengage from the first groove. The second bump is slidably connected to the second chute, enabling the second bump to slide within the second chute. With the guidance and limitation of the second chute, the second slider has only one degree of freedom in one direction and will not disengage from the sliding seat.

[0014] Preferably, the self-locking structure includes a first sliding cavity and a third slider. The third slider is located inside the fourth wedge block. A first limiting ring is fixedly provided at the bottom of the third slider, and the first limiting ring is slidably connected to the first sliding cavity. The locking tongue is located at the bottom of the first limiting ring. A third limiting ring is provided at the bottom of the first sliding cavity, and the locking tongue is in clearance fit with the central hole of the third limiting ring. On both sides of the top of the third slider, first wedge blocks are fixedly provided, and a spring is fixedly provided at the top of the third slider through a fixed platform.

[0015] During operation, the first limiting ring is slidably connected to the first sliding cavity, enabling the first limiting ring to slide within the first sliding cavity. The locking tongue is in clearance fit with the central hole of the third limiting ring, enabling the locking tongue to slide within the central hole of the third limiting ring. With the limitation of the first limiting ring and the third limiting ring, the third slider will not disengage from the first sliding cavity.

[0016] Preferably, a second sliding cavity is provided on one side of the first sliding cavity. The second sliding cavity communicates with the first sliding cavity. A fourth slider is provided on one side of the first wedge block, and the fourth slider is slidably connected to the second sliding cavity. On both sides of one end of the fourth slider close to the first wedge block, fourth wedge blocks are provided, and the fourth wedge blocks are engaged with the third slider. The inclined surface of the fourth wedge block is in contact with the inclined surface of the first wedge block. A wedge-shaped groove is provided on the side of the fourth slider away from the fourth wedge block, and a third sliding cavity is provided at the top of the second sliding cavity.

[0017] During operation, the fourth slider is slidably connected to the second sliding cavity, enabling the fourth slider to slide within the second sliding cavity. With the engagement of the fourth wedge block and the third slider and the contact between the inclined surface of the fourth wedge block and the inclined surface of the first wedge block, when the fourth wedge block moves towards the third slider, it will squeeze the first wedge block to slide upward along the inclined surface of the fourth wedge block.

[0018] Preferably, the third sliding cavity communicates with the second sliding cavity. A fifth slider is provided on the top of the fourth slider. A second limiting ring is fixedly provided on the top of the fifth slider. The second limiting ring is slidably connected to the third sliding cavity. A switch is provided on the top of the second limiting ring. A fourth limiting ring is provided on the top of the third sliding cavity. The switch is in clearance fit with the central hole of the fourth limiting ring. A third wedge block is provided on the bottom of the fifth slider. The third wedge block is engaged with the wedge groove.

[0019] During operation, the second limiting ring is slidably connected to the third sliding cavity, so that the second limiting ring can slide within the third sliding cavity. The switch is in clearance fit with the central hole of the fourth limiting ring, so that the switch can slide within the central hole of the fourth limiting ring. The third wedge block is engaged with the wedge groove, so that the third wedge block slides downward along the inclined surface of the wedge groove, squeezing the fourth slider to slide to one side.

[0020] Preferably, a heart rate sensor is provided at the bottom of the strap. The heart rate sensor is fixedly connected to the strap. The heart rate sensor is fixedly connected to the second slider. A sixth limiting ring is fixedly provided on the side of the second ratchet tooth close to the spring piece. A fifth limiting ring is provided on the side of the fifth sliding cavity close to the first ratchet tooth. Notches are provided on both sides of the locking ring. The notches penetrate through the outer wall of the locking ring and communicate with the fifth sliding cavity. A dial block is fixedly provided on one side of the second ratchet tooth. The dial block passes through the notch and extends to the outside of the locking ring. The dial block is slidably connected to the notch.

[0021] During operation, the heart rate sensor enables the device to detect the patient's heart rate in real time, preventing sudden situations during the examination. The fifth limiting ring and the sixth limiting ring prevent the second ratchet tooth from falling out of the fifth sliding cavity. The dial block is slidably connected to the notch, so that the dial block can slide within the notch.

[0022] The specific beneficial effects are as follows:

[0023] 1. For the four-limb limiting and fixing device for CT of the present invention, by arranging a first slider, a sliding seat, a second slider, a first positioning hole, a second positioning hole and a self-locking structure inside the positioning device, when positioning is required, the self-locking structure is unlocked, and then the first slider and the second slider are respectively slid to the designated positions, and then the locking tongues of the self-locking structure are respectively engaged with the first positioning hole and the second positioning hole to achieve positioning.

[0024] 2. For the four-limb limiting and fixing device for CT of the present invention, by arranging a strap, a locking ring, a fourth sliding cavity, a first ratchet tooth, a second ratchet tooth, a spring piece and a fifth sliding cavity inside the fixing device, when fixing, the patient's arm is sleeved with the strap, and then the fixing is achieved through the engagement of the first ratchet tooth and the second ratchet tooth.

[0025] On one side of the fourth slider away from the fourth wedge block, there is a wedge-shaped groove. At the bottom of the fifth slider, there is a third wedge block, and the third wedge block engages with the wedge-shaped groove, causing the third wedge block to slide downward along the inclined surface of the wedge-shaped groove and squeezing the fourth slider to slide to one side. Brief Description of the Drawings

[0026] The present invention will be further described below in conjunction with the drawings.

[0027] Figure 1 is a perspective view of the present invention;

[0028] Figure 2 is a partial perspective view of the present invention;

[0029] Figure 3 is a partial perspective sectional view of the present invention;

[0030] Figure 4 is a partial sectional view of the present invention;

[0031] Figure 5 is a partial perspective view of the present invention;

[0032] Figure 6 is a partial sectional view of the present invention;

[0033] Figure 7 is the present invention Figure 6 an enlarged view of A in;

[0034] Figure 8 is a partial side view of the present invention.

[0035] In the figure: 10, lying board; 20, positioning device; 30, fixing device; 1001, bottom board; 1002, first groove; 1003, first positioning hole; 1004, first chute; 2001, first slider; 2002, second slider; 2003, second chute; 2004, second positioning hole; 2005, first convex block; 2006, sliding seat; 2007, second convex block; 210, self-locking structure; 2101, locking tongue; 2102, first limiting ring; 2103, third slider; 2104, first wedge block; 2105, fourth slider; 2106, wedge groove; 2107, fifth slider; 2108, third wedge block; 2109, second limiting ring; 2110, fourth wedge block; 2111, switch; 2112, spring; 2113, first sliding cavity; 2114, third limiting ring; 2115, second sliding cavity; 2116, third sliding cavity; 2117, fourth limiting ring; 3001, strap; 3002, lock ring; 3003, heart rate sensor; 3004, first ratchet; 3005, fourth sliding cavity; 3006, fifth sliding cavity; 3007, spring piece; 3008, fifth limiting ring; 3009, sixth limiting ring; 3010, second ratchet; 3011, notch; 3012, dialing block. Detailed implementation manners

[0036] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0037] As Figures 1 to 8 shown, the present invention provides a four-limb limiting and fixing device for CT, including: a lying board 10, a positioning device 20 and a fixing device 30;

[0038] The lying board 10 includes a bottom board 1001. Four corners of the bottom board 1001 are provided with first grooves 1002, and the bottom of the first grooves 1002 is provided with a plurality of first positioning holes 1003;

[0039] The positioning device 20 includes a first slider 2001. The first slider 2001 is located inside the first groove 1002. The first slider 2001 is slidably connected with the first groove 1002. The top of the first slider 2001 is provided with a sliding seat 2006. The top of the sliding seat 2006 is slidably provided with a second slider 2002. The top of the sliding seat 2006 is provided with a plurality of second positioning holes 2004. A self-locking structure 210 is arranged inside the first slider 2001 and the second slider 2002. A locking tongue 2101 is arranged inside the self-locking structure 210. The locking tongue 2101 of the self-locking structure 210 inside the first slider 2001 is in clearance fit with a plurality of first positioning holes 1003, and the locking tongue 2101 of the self-locking structure 210 inside the second slider 2002 is in clearance fit with the second positioning holes 2004;

[0040] The fixing device 30 includes a strap 3001 which is located at the top of the second slider 2002. One end of the strap 3001 is fixedly provided with a locking ring 3002. A through fourth sliding cavity 3005 is provided on one side of the locking ring 3002. The strap 3001 is slidably connected to the fourth sliding cavity 3005. A first ratchet 3004 is provided on the inner side of the strap 3001. The first ratchet 3004 is a concave ratchet. A fifth sliding cavity 3006 is provided on the side of the fourth sliding cavity 3005 close to the first ratchet 3004. A second ratchet 3010 is slidably provided inside the fifth sliding cavity 3006. The second ratchet 3010 engages with the first ratchet 3004. A spring piece 3007 is provided on the side of the second ratchet 3010 away from the first ratchet 3004.

[0041] During operation, first, the patient lies on the bottom plate 1001. Then, the first sliders 2001 at the four corners of the top of the bottom plate 1001 are slid, so that the first sliders 2001 move to the vicinity of the arm to be fixed. The first sliders 2001 drive the sliding seats 2006 and the second sliders 2002 to move synchronously. Then, the locking tongue 2101 of the self-locking structure 210 inside the first slider 2001 is engaged with one of the first positioning holes 1003, so as to realize the longitudinal fixation of the patient's limbs, enabling this device to adapt to people of different heights. Then, the second slider 2002 is slid again to fix the patient's limbs to a relatively comfortable position. Then, the locking tongue 2101 of the self-locking structure 210 inside the second slider 2002 is engaged with one of the second positioning holes 2004, so as to realize the transverse fixation of the patient's limbs, enabling this device to adapt to people of different body builds. Then, the strap 3001 is put on the patient's limbs. Then, the end of the strap 3001 away from the locking ring 3002 is passed through the fourth sliding cavity 3005. Since the first ratchet 3004 engages with the second ratchet 3010 and due to the setting of the spring piece 3007, the inclined surface of the first ratchet 3004 will slide along the inclined surface of the second ratchet 3010. At the same time, the second ratchet 3010 presses the spring piece 3007 to slide towards the side of the second ratchet 3010 away from the first ratchet 3004. When the patient adjusts to the appropriate tightness, since the first ratchet 3004 engages with the second ratchet 3010, the strap 3001 can only move unidirectionally in the fourth sliding cavity 3005, thus realizing the self-locking of the locking ring 3002 to the strap 3001.

[0042] Preferably, first chutes 1004 are provided on both sides of the first groove 1002. First convex blocks 2005 are provided on both sides of the first slider 2001. The first convex blocks 2005 are slidably connected to the first chutes 1004. Second chutes 2003 are provided on both sides of the sliding seat 2006. Second convex blocks 2007 are provided on both sides of the second slider 2002. The second convex blocks 2007 are slidably connected to the second chutes 2003.

[0043] During operation, the first bump 2005 is slidably connected to the first chute 1004, enabling the first bump 2005 to slide within the first chute 1004. With the guidance and limitation of the first chute 1004, the first slider 2001 has only one degree of freedom and will not disengage from the first groove 1002. The second bump 2007 is slidably connected to the second chute 2003, allowing the second bump 2007 to slide within the second chute 2003. With the guidance and limitation of the second chute 2003, the second slider 2002 has only one degree of freedom and will not disengage from the sliding seat 2006.

[0044] Preferably, the self-locking structure 210 includes a first sliding cavity 2113 and a third slider 2103. The third slider 2103 is located inside the fourth wedge block 2110. A first limiting ring 2102 is fixedly provided at the bottom of the third slider 2103, and the first limiting ring 2102 is slidably connected to the first sliding cavity 2113. The locking tongue 2101 is located at the bottom of the first limiting ring 2102. A third limiting ring 2114 is provided at the bottom of the first sliding cavity 2113, and the locking tongue 2101 has a clearance fit with the central hole of the third limiting ring 2114. On both sides of the top of the third slider 2103, first wedge blocks 2104 are fixedly provided, and a spring 2112 is fixedly provided at the top of the third slider 2103 through a fixed platform.

[0045] During operation, with the first limiting ring 2102 being slidably connected to the first sliding cavity 2113, the first limiting ring 2102 can slide within the first sliding cavity 2113. With the locking tongue 2101 having a clearance fit with the central hole of the third limiting ring 2114, the locking tongue 2101 can slide within the central hole of the third limiting ring 2114. And with the limitation of the first limiting ring 2102 and the third limiting ring 2114, the third slider 2103 will not disengage from the first sliding cavity 2113.

[0046] Preferably, a second sliding cavity 2115 is provided on one side of the first sliding cavity 2113. The second sliding cavity 2115 is in communication with the first sliding cavity 2113. On one side of the first wedge block 2104, a fourth slider 2105 is provided. The fourth slider 2105 is slidably connected to the second sliding cavity 2115. On both sides of one end of the fourth slider 2105 close to the first wedge block 2104, fourth wedge blocks 2110 are provided. The fourth wedge blocks 2110 are engaged with the third slider 2103. The inclined surfaces of the fourth wedge blocks 2110 are in contact with the inclined surfaces of the first wedge blocks 2104. A wedge-shaped groove 2106 is provided on one side of the fourth slider 2105 away from the fourth wedge block 2110, and a third sliding cavity 2116 is provided at the top of the second sliding cavity 2115.

[0047] During operation, the fourth slider 2105 is slidably connected to the second sliding cavity 2115, enabling the fourth slider 2105 to slide within the second sliding cavity 2115. The fourth wedge block 2110 and the third slider 2103 are engaged with each other, and the inclined surfaces of the fourth wedge block 2110 and the first wedge block 2104 are in contact with each other. When the fourth wedge block 2110 moves towards the third slider 2103, it will squeeze the first wedge block 2104 to slide upward along the inclined surface of the fourth wedge block 2110.

[0048] Preferably, the third sliding cavity 2116 communicates with the second sliding cavity 2115. A fifth slider 2107 is provided on the top of the fourth slider 2105. A second limiting ring 2109 is fixedly provided on the top of the fifth slider 2107. The second limiting ring 2109 is slidably connected to the third sliding cavity 2116. A switch 2111 is provided on the top of the second limiting ring 2109. A fourth limiting ring 2117 is provided on the top of the third sliding cavity 2116. The switch 2111 is in clearance fit with the central hole of the fourth limiting ring 2117. A third wedge block 2108 is provided on the bottom of the fifth slider 2107. The third wedge block 2108 is engaged with the wedge groove 2106.

[0049] During operation, the second limiting ring 2109 is slidably connected to the third sliding cavity 2116, enabling the second limiting ring 2109 to slide within the third sliding cavity 2116. The switch 2111 is in clearance fit with the central hole of the fourth limiting ring 2117, enabling the switch 2111 to slide within the central hole of the fourth limiting ring 2117. The third wedge block 2108 is engaged with the wedge groove 2106, enabling the third wedge block 2108 to slide downward along the inclined surface of the wedge groove 2106 and squeeze the fourth slider 2105 to slide to one side.

[0050] Preferably, a heart rate sensor 3003 is provided at the bottom of the strap 3001. The heart rate sensor 3003 is fixedly connected to the strap 3001 and the second slider 2002. A sixth limiting ring 3009 is fixedly provided on the side of the second ratchet 3010 close to the spring piece 3007. A fifth limiting ring 3008 is provided on the side of the fifth sliding cavity 3006 close to the first ratchet 3004. Notches 3011 are provided on both sides of the lock ring 3002. The notches 3011 penetrate through the outer wall of the lock ring 3002 and communicate with the fifth sliding cavity 3006. A dial block 3012 is fixedly provided on one side of the second ratchet 3010. The dial block 3012 passes through the notch 3011 and extends to the outside of the lock ring 3002. The dial block 3012 is slidably connected to the notch 3011.

[0051] When working, the setting of the heart rate sensor 3003 allows the device to detect the patient's heart rate in real time to prevent emergencies during the examination. The setting of the fifth limiting ring 3008 and the sixth limiting ring 3009 ensures that the second ratchet 3010 will not separate from the fifth sliding cavity 3006. The sliding block 3012 is connected to the slot 3011 through sliding connection with the slot 3011, so that the sliding block 3012 can slide in the slot 3011.

[0052] The specific workflow is as follows:

[0053] First, the patient lies on the bottom plate 1001. Then, slide the first sliders 2001 at the four corners on the top of the bottom plate 1001. Then, press the switches 2111 on the first sliders 2001 and the second sliders 2002 respectively. The switches 2111 move downward to drive the fifth slider 2107 to move downward. The fifth slider 2107 drives the third wedge block 2108 to slide downward. Since the third wedge block 2108 and the wedge groove 2106 are engaged with each other, the third wedge block 2108 will slide along the inclined surface of the wedge groove 2106 towards the fourth slider 2105 and squeeze the fourth slider 2105 to move towards the third slider 2103. The fourth slider 2105 drives the fourth wedge block 2110 to move towards the third slider 2103. Since the fourth wedge block 2110 and the third slider 2103 are engaged with each other, and the inclined surface of the first wedge block 2104 is in contact with the inclined surface of the fourth wedge block 2110, the fourth wedge block 2110 will slide along the inclined surface of the first wedge block 2104 towards the third slider 2103 and squeeze the third slider 2103 to slide upward, so that the third slider 2103 drives the locking tongue 2101 to move upward to achieve unlocking. Then, move the first slider 2001 to near the arm to be fixed. The first slider 2001 drives the sliding seat 2006 and the second slider 2002 to move synchronously. When the first slider 2001 and the second slider 2002 move to the appropriate positions, then release the switch 2111. Due to the setting of the spring 2112, the spring 2112 will make the third slider 2103 move downward by its elastic force so that the locking tongue 2101 is engaged with the first positioning hole 1003 and the second positioning hole 2004 respectively, making the first slider 2001 and the second slider 2002 immobile. The positioning of the first slider 2001 is convenient for the longitudinal fixation of the patient's limbs, so that the device can adapt to people of different heights. The positioning of the second slider 2002 is convenient for the transverse fixation of the patient's limbs, so that the device can adapt to people of different body builds.When the third slider 2103 moves downward, it will drive the fourth slider 2105 to move away from the third slider 2103. When the fourth slider 2105 moves away from the third slider 2103, it will drive the fifth slider 2107 to move upward. The upward movement of the fifth slider 2107 drives the switch 2111 to move upward, thus realizing the reset of the switch 2111. Then, the strap 3001 is put on the limbs of the patient. Then, the end of the strap 3001 far away from the locking ring 3002 passes through the fourth sliding cavity 3005. Since the first ratchet 3004 and the second ratchet 3010 are engaged with each other, and due to the arrangement of the spring piece 3007, the inclined surface of the first ratchet 3004 will slide along the inclined surface of the second ratchet 3010, and the second ratchet 3010 will squeeze the spring piece 3007 to slide away from the first ratchet 3004 on the side of the second ratchet 3010. When the patient adjusts to the appropriate tightness, since the first ratchet 3004 and the second ratchet 3010 are engaged with each other, the strap 3001 can only move unidirectionally in the fourth sliding cavity 3005, thus realizing the self-locking of the locking ring 3002 on the strap 3001. When unlocking is required, the dial 3012 is toggled to make the second ratchet 3010 away from the first ratchet 3004, thus realizing unlocking and facilitating the user to loosen the strap 3001.,

[0054] The above front, back, left, right, up, and down are all based on the Figure 1 in the accompanying drawings of the specification. Taking the perspective of the person observing as the standard, the side of the device facing the observer is defined as the front, and the left side of the observer is defined as the left, and so on.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "middle", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are the orientation or positional relationships based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention 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, and therefore cannot be understood as a limitation on the protection scope of the present invention.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A limb limiting and fixing device for CT, characterized in that: include: A lying board (10), a positioning device (20) and a fixing device (30); The lying board (10) comprises a bottom plate (1001), four corners of the bottom plate (1001) are provided with first grooves (1002), and the bottom of the first grooves (1002) is provided with a plurality of first positioning holes (1003); The positioning device (20) comprises a first slider (2001), the first slider (2001) is located inside the first groove (1002), the first slider (2001) is slidably connected to the first groove (1002), a sliding seat (2006) is provided on the top of the first slider (2001), a second slider (2002) is slidably provided on the top of the sliding seat (2006), a plurality of second positioning holes (2004) are provided on the top of the sliding seat (2006), The first slider (2001) and the second slider (2002) are provided with a self-locking structure (210) inside, and a locking tongue (2101) is provided inside the self-locking structure (210). The locking tongue (2101) of the self-locking structure (210) inside the first slider (2001) is clearance-matched with a plurality of the first positioning holes (1003), and the locking tongue (2101) of the self-locking structure (210) inside the second slider (2002) is clearance-matched with the second positioning holes (2004); The fixing device (30) comprises a strap (3001), wherein the strap (3001) is located at the top of the second slider (2002), a locking ring (3002) is fixedly provided at one end of the strap (3001), a fourth sliding cavity (3005) is provided on one side of the locking ring (3002), the strap (3001) is slidably connected to the fourth sliding cavity (3005), a first ratchet (3004) is provided on the inner side of the strap (3001), and the The first ratchet tooth (3004) is an inwardly concave ratchet tooth, a fifth sliding cavity (3006) is provided on the side of the fourth sliding cavity (3005) close to the first ratchet tooth (3004), a second ratchet tooth (3010) is slidably provided inside the fifth sliding cavity (3006), the second ratchet tooth (3010) is engaged with the first ratchet tooth (3004), and a spring sheet (3007) is provided on the side of the second ratchet tooth (3010) away from the first ratchet tooth (3004).

2. According to claim 1, a limb limiting and fixing device for CT, characterized in that: A first slide groove (1004) is provided on both sides of the first groove (1002), a first protrusion (2005) is provided on both sides of the first sliding block (2001), and the first protrusion (2005) is slidably connected to the first slide groove (1004), a second slide groove (2003) is provided on both sides of the sliding seat (2006), and a second protrusion (2007) is provided on both sides of the second sliding block (2002), and the second protrusion (2007) is slidably connected to the second slide groove (2003).

3. According to claim 2, a limb limiting and fixing device for CT, characterized in that: The self-locking structure (210) comprises a first sliding cavity (2113) and a third sliding block (2103), wherein the third sliding block (2103) is located inside the first sliding cavity (2113), a first limiting ring (2102) is fixedly provided at the bottom of the third sliding block (2103), the first limiting ring (2102) is slidably connected to the first sliding cavity (2113), the locking tongue (2101) is located at the bottom of the first limiting ring (2102), a third limiting ring (2114) is provided at the bottom of the first sliding cavity (2113), the locking tongue (2101) and the central hole of the third limiting ring (2114) are gap-matched, first wedge blocks (2104) are fixedly provided at both sides of the top of the third sliding block (2103), and a spring (2112) is fixedly provided at the top of the third sliding block (2103) through a fixing platform.

4. According to claim 3, a limb limiting and fixing device for CT, characterized in that: A second sliding cavity (2115) is provided on one side of the first sliding cavity (2113), and the second sliding cavity (2115) is communicated with the first sliding cavity (2113); a fourth sliding block (2105) is provided on one side of the first wedge block (2104), and the fourth sliding block (2105) is slidably connected to the second sliding cavity (2115); fourth wedge blocks (2110) are provided on both sides of one end of the fourth sliding block (2105) close to the first wedge block (2104); the fourth wedge block (2110) and the third sliding block (2103) are engaged with each other, and the inclined surface of the fourth wedge block (2110) is in contact with the inclined surface of the first wedge block (2104); a wedge groove (2106) is provided on the side of the fourth sliding block (2105) away from the fourth wedge block (2110); and a third sliding cavity (2116) is provided at the top of the second sliding cavity (2115).

5. The limb limiting and fixing device for CT according to claim 4, characterized in that: The third sliding cavity (2116) is communicated with the second sliding cavity (2115), a fifth sliding cavity (2107) is provided on the top of the fourth sliding cavity (2105), a second limiting ring (2109) is fixedly provided on the top of the fifth sliding cavity (2107), the second limiting ring (2109) is slidably connected with the third sliding cavity (2116), a switch (2111) is provided on the top of the second limiting ring (2109), a fourth limiting ring (2117) is provided on the top of the third sliding cavity (2116), the switch (2111) and the center hole of the fourth limiting ring (2117) are gap-matched, a third wedge block (2108) is provided on the bottom of the fifth sliding cavity (2107), and the third wedge block (2108) and the wedge groove (2106) are mutually engaged.

6. The limb limiting and fixing device for CT according to claim 5, characterized in that: A heart rate sensor (3003) is provided at the bottom of the strap (3001), the heart rate sensor (3003) is fixedly connected to the strap (3001), the heart rate sensor (3003) is fixedly connected to the second slider (2002), a sixth limiting ring (3009) is fixedly provided on a side of the second ratchet (3010) close to the spring sheet (3007), and a first limiting ring (3009) is fixedly provided on a side of the fifth sliding cavity (3006) close to the first ratchet (3004). A fifth limiting ring (3008), notches (3011) are provided on both sides of the locking ring (3002), the notches (3011) penetrate the outer wall of the locking ring (3002) and are connected to the fifth sliding cavity (3006), a shift block (3012) is fixedly provided on one side of the second ratchet (3010), the shift block (3012) passes through the notch (3011) and extends to the outside of the locking ring (3002), and the shift block (3012) is slidably connected to the notch (3011).

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