CN210383898U

CN210383898U - Mechanical pressurizing equipment for magnetic resonance imaging of knee joint in human body horizontal position

Info

Publication number: CN210383898U
Application number: CN201820304394.3U
Authority: CN
Inventors: 刘潼; 左建林; 刘桂锋; 肖建林; 高忠礼
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2018-03-06
Filing date: 2018-03-06
Publication date: 2020-04-24
Anticipated expiration: 2028-03-06

Abstract

The utility model relates to a mechanical pressurizing device for nuclear magnetic resonance imaging of knee joint when human body is in horizontal position, which consists of a plantar mechanical pressurizing device and a knee joint fixing device; the plantar mechanical pressurizing device comprises a base plate and a pressurizing unit, wherein a first sliding groove is formed in the base plate, the pressurizing unit comprises a sliding bottom plate connected with the base plate in a sliding mode, and a back plate is fixed on the upper surface of the sliding bottom plate; two second sliding chutes parallel to the sliding bottom plate are fixed on one surface of the back plate, a sliding plate is connected between the two second sliding chutes in a sliding manner, a fixed disc with a pressure sensor fixed at the circle center is fixed on the sliding plate, and a spiral transmission mechanism is fixed on the other surface of the back plate; the knee joint fixing device comprises a knee joint sleeve and two pairs of fixing arms, rotating shafts with two opposite sides are fixed through the knee joint sleeve, and each rotating shaft is connected with a pair of fixing arms. When the utility model is used for MRI diagnosis, the imaging performance of each tissue of the knee joint under different mechanical pressurization conditions is obtained.

Description

Mechanical pressurizing equipment for magnetic resonance imaging of knee joint in human body horizontal position

Technical Field

The utility model belongs to the technical field of clinical medicine's image science, bone science and motion medical science's equipment, concretely relates to mechanics pressure equipment that is used for knee joint nuclear magnetic resonance imaging when human horizontal position.

Background

Magnetic Resonance Imaging (MRI) scanning of human knee joints is an important means for diagnosing various injuries and diseases of the knee joints, and has important significance particularly on menisci, articular cartilages and ligaments. With the recent continuous improvement of resolution and magnetic field strength of MRI apparatuses, the accuracy of diagnosis of knee joint related diseases is also gradually increasing. For doctors in the bone science and sports medicine professions, good knee joint MRI images are of great guiding significance for treatment of related diseases. However, for some important structures in the human knee joint, especially meniscus and articular cartilage, the normal horizontal scan can make the morphology and structure of the knee joint different from those under physiological functional stress. This is because such tissues generally have a low modulus of elasticity and exhibit large deformation behavior under stress. The knee joint is the most complex large joint in a human body, has six degrees of motion, and can be stressed by six times of the weight of the human body at the maximum in the normal motion process of the human body, and under the complex stress environment, the articular cartilage of the knee joint and the meniscus have different morphological changes in different mechanical modes. In particular, in the damaged and pathological states, the meniscus has different changes in surface morphology, prolapse, injury and joint space in different stressed states compared with non-stressed states. Therefore, the diagnosis of injuries of meniscus of knee joint and cartilage related diseases by simply relying on MRI images under non-stress may underestimate the actual condition of the disease to some extent, thereby affecting the judgment of the doctor and the final treatment effect.

At present, most of the existing MRI equipment on the world enables patients to scan in a horizontal and joint-unstressed state, while the MRI equipment with a small part of seats in a semi-open type can only realize the pressurization on parts of organs such as the spine of a human body, and has limited significance on knee joints, and because of the semi-open design of the equipment, the field intensity and the resolution ratio of the equipment can hardly meet the diagnosis requirements of related diseases of the knee joints. Therefore, it is imperative to design a related independent knee compression device that can be applied to MRI.

Disclosure of Invention

The utility model aims at providing a mechanics pressure equipment that is used for knee joint nuclear magnetic resonance imaging when human horizontal position based on the deep research to human knee joint functional stress mode, solved the problem that the diagnostic rate of accuracy of patient's knee joint relevant disease is low, obtain the imaging performance of each tissue of knee joint under different mechanics pressurization conditions.

The purpose of the utility model is realized through the following technical scheme: a mechanical compression device for nuclear magnetic resonance imaging of knee joint in human horizontal position comprises a plantar mechanical compression device 1 and a knee joint fixing device 2; the plantar mechanical pressurizing device 1 comprises a base plate 3 and a pressurizing unit 4, wherein two first sliding grooves 5 which are parallel to each other are formed in the base plate 3, a binding belt fixing hole 12 is formed in the base plate 3, the pressurizing unit 4 comprises a sliding bottom plate 6, a sliding block which is connected with the first sliding grooves 5 in a sliding mode is arranged on the lower surface of the sliding bottom plate 6, and a back plate 7 which is perpendicular to the sliding bottom plate 6 is fixed on the upper surface of the sliding bottom plate 6; two second sliding chutes 8 parallel to the sliding bottom plate 6 are fixed on one surface of the back plate 7, a sliding plate 9 is arranged between the two second sliding chutes 8 and is in sliding connection with the second sliding chutes 8, a circular fixed disc 16 is fixed on the sliding plate 9, and a pressure sensor 10 is fixed at the circle center of the fixed disc 16; a screw transmission mechanism 11 is fixed on the other surface of the back plate 7; the knee joint fixing device comprises a sliding plate 9, wherein two pairs of bandage fixing holes 12 which are symmetrical with the diameter of a fixing disc vertical to a base plate 3 are formed in the sliding plate 9, the angle between the diameter of each bandage fixing hole 12 in the middle and the diameter vertical to the base plate 3 is 7 degrees, the angle between the diameter of each bandage fixing hole 12 in the two sides and the diameter vertical to the base plate 3 is 20 degrees, the knee joint fixing device 2 comprises a round tube type knee joint sleeve 13 and two pairs of fixing arms 14, the bandage fixing holes 12 are formed in the fixing arms 14, rotating shafts 15 with two opposite sides are fixed through the knee joint sleeve 13, and each rotating shaft 15 is connected with one pair of fixing arms 14.

As a more excellent technical solution of the utility model: a limiting device is arranged between the fixed arms 14 and the rotating shaft 15, and each fixed arm 14 can rotate around the rotating shaft 15 and the axis of the knee joint sleeve 13 within the range of 0-15 degrees.

As the preferred technical scheme of the utility model: the substrate 3 is provided with a spiral transmission groove 17, and the transmission groove 17 is in transmission connection with a screw rod in the spiral transmission mechanism 11.

As a more excellent technical solution of the utility model: the mechanical pressurizing equipment for the nuclear magnetic resonance imaging of the knee joint in the horizontal position of the human body is made of polyformaldehyde resin, and is connected through rivets made of paramagnetic alloy materials such as titanium alloy or aluminum alloy, and the plantar mechanical sensor is made of aluminum alloy.

The beneficial effects are as follows:

the utility model discloses a carry out the mechanical pressurization under the MRI scanning process through to the different bucklings of knee joint and rotation state to human knee joint, through the physiology and the pathology image science performance of knee joint meniscus and articular cartilage under mechanical pressurization state, acquire the deformation condition of meniscus and articular cartilage under various stress state, also obtain the operational mode of more complete knee joint under functional atress, improve the rate of accuracy of knee joint disease to better being applied to in the aspect of clinical and scientific research.

Drawings

Fig. 1 is an isometric view of the plantar mechanical compression device of the present invention;

fig. 2 is an isometric view of the knee joint fixator of the present invention;

fig. 3 is a side view of the sole mechanical pressing device of the present invention;

fig. 4 is a top view of the plantar mechanical compression device of the present invention;

fig. 5 is a front view of the sole mechanical pressing device of the present invention;

FIG. 6 is a side view of the knee brace of the present invention;

wherein: 1. a plantar mechanical pressurizing device; 2 a knee joint fixing device; 3 a substrate; 4 a pressurizing unit; 5. a first chute; 6. a sliding bottom plate; 7. a back plate; 8. a second chute; 9. a sliding plate; 10. a pressure sensor; 11. a screw drive mechanism; 12. a binding band fixing hole; 13. a knee joint sleeve; 14. a fixed arm; 15. a rotating shaft; 16. fixing the disc; 17. a transmission groove.

Detailed Description

The present invention will be described in further detail with reference to the following specific embodiments and the accompanying drawings.

As shown in fig. 1, the utility model provides a mechanical compression device for magnetic resonance imaging of knee joint in human horizontal position, which comprises a plantar mechanical compression device 1 and a knee joint fixing device 2; the plantar mechanical pressurizing device 1 comprises a base plate 3 and a pressurizing unit 4.

The base plate 3 is provided with two parallel first sliding grooves 5. The base plate 3 is provided with a binding belt fixing hole 12 for fixing the ilium, hip and thigh of the collector with different heights. The pressurizing unit 4 comprises a sliding bottom plate 6, a sliding block connected with the first sliding groove 5 in a sliding mode is arranged on the lower surface of the sliding bottom plate 6, and the pressurizing unit 4 freely slides on the substrate 3 in the horizontal direction. A back plate 7 vertical to the sliding bottom plate 6 is fixed on the upper surface of the sliding bottom plate.

Two second sliding grooves 8 parallel to the sliding bottom plate 6 are fixed on one surface of the back plate 7, and a sliding plate 9 is arranged between the two second sliding grooves 8 and is in sliding connection with the second sliding grooves 8, so that the sliding plate 9 can freely slide left and right to adapt to left/right limbs of a subject. A circular fixed disc 16 is fixed on the sliding plate 9, a pressure sensor 10 is fixed at the circle center of the fixed disc 16, and the pressure sensor 10 is displayed to a tester through an external cable and used for detecting whether the optical load applied by the sole of a tested person meets the test standard.

The other side of the backboard 7 is fixed with a screw transmission mechanism 11, the screw transmission mechanism 11 pushes the backboard 7 to move back and forth, and pressure load is applied to the sole of a subject, so that the sole pressurization function is realized.

The sliding plate 9 is provided with two pairs of bandage fixing holes 12 which are symmetrical by the diameter of the fixing disc vertical to the base plate 3, the angle between the diameter of the middle two bandage fixing holes 12 and the diameter vertical to the base plate 3 is 7 degrees, the angle between the diameter of the two bandage fixing holes 12 at the two sides and the diameter vertical to the base plate 3 is 20 degrees, and the two bandage fixing holes are used for fixing the feet of the subject at three positions of neutral, 15 degrees of outward rotation and 15 degrees of inward rotation respectively. The substrate 3 is provided with a spiral transmission groove 17, and the transmission groove 17 is in transmission connection with a screw rod in the spiral transmission mechanism 11.

The knee joint fixing device 2 comprises a round tube type knee joint sleeve 13 and two pairs of fixing arms 14, wherein the fixing arms 14 are provided with bandage fixing holes 12 for fixing thighs and shanks of a subject. Two opposite rotating shafts 15 are fixed through the knee joint sleeve 13, and a pair of fixing arms 14 are connected to each rotating shaft 15. A limiting device is arranged between the fixed arms 14 and the rotating shaft 15, and each fixed arm 14 can rotate around the rotating shaft 15 and the axis of the knee joint sleeve 13 within the range of 0-15 degrees. The rotating shaft 15 allows each fixing arm to rotate freely at 0-15 degrees, and finally the knee joint flexion angle can be adjusted at 0-30 degrees and the angle is locked. As most of MRI equipment coils on the market have limited space, the 0-30 degree flexion-extension range is obtained through the use experience of the MRI equipment with the mainstream brand model on the market, so that the equipment adapts to most of scanning equipment, and the 0-30 degree joint motion range is enough to verify the motion condition of the knee joint when a person normally stands and walks.

The mechanical pressurizing equipment for the nuclear magnetic resonance imaging of the knee joint in the horizontal position of the human body is made of polyformaldehyde resin, because MRI (magnetic resonance imaging) of the polyformaldehyde resin does not have magnetism and does not generate artifacts, the polyformaldehyde resin is connected through rivets made of paramagnetic alloy materials such as titanium alloy or aluminum alloy, and the plantar mechanical sensor is made of aluminum alloy.

The utility model provides a mechanics pressure equipment's working process as follows:

firstly, a knee joint fixator is worn on a knee joint part to be tested of a testee, a thigh and a shank of the testee are respectively fixed through the matching of a fixing arm and a binding belt, the knee joint flexion angle is adjusted according to actual needs and the knee joint flexion angle is fixed so as to test the change of knee joint cartilage and meniscus under the stress of the testee in the standing and asynchronous processes. Then the subject lies on the MRI bed, the mechanical compression plate is placed on the sole of the foot, and the ilium, the hip and the thigh are respectively fixed by using the binding bands. The upper sliding plate of the pressurizer is moved according to different left and right sides to be tested, the pressurizing unit is attached to the sole of the lower limb to be tested through spiral transmission according to different heights of a tested person, the sole is stepped on the mechanical sensor, the foot is fixed through the binding band on the fixed disc, and the position of the foot is adjusted to be a neutral position, an internal rotation position of 15 degrees or an external rotation position of 15 degrees according to requirements, so that the change of the knee joint cartilage and the meniscus under the pressure under the condition of different leg rotations is obtained. After the lower limbs of the testee are firmly fixed, the pressure sensor is activated, the sole of the foot is slowly pressurized by rotating the screw transmission device, the reading of the sensor is observed, the MRI imaging change of the knee joint can be tested according to different pressurizing force when the knee joint stands, jumps, walks or goes up and down steps and other stress conditions, and the comfort degree with the testee is confirmed in the pressurizing process. And after the pressurization is satisfied, the knee joint can be subjected to MRI scanning. If other compression amount or critical flexion and extension and rotation condition needs to be scanned, the subject can be ordered to rest in the lying position or the sitting position for 30 minutes to restore the original shape of the soft tissue of the knee joint.

The utility model discloses a prototype equipment is verified after 5 healthy volunteers MRI scans through preliminary application, pressurizes to the condition of 50% and 100% weight pressure at equipment, and the experimenter can tolerate equipment pressure of exerting completely in whole scanning process to there is not relevant uncomfortable symptom, and can resume daily activities such as standing, walking immediately after the scanning finishes. By comparing the three-dimensional reconstruction models of the meniscus and the articular cartilage obtained under the non-pressurized condition and the mechanical pressurization, the corresponding model morphological changes can be clearly observed, and the three-dimensional reconstruction models of the meniscus and the articular cartilage obtained under the different stress conditions also have corresponding different deformation modes. The preliminary use results prove that the equipment can be used for acquiring the MRI scanning images of tissues such as knee joint meniscus, cartilage and the like under the mechanical pressurization condition, the images can be widely applied to relevant fields such as clinical diagnosis, basic scientific research and the like, and the equipment is safe and reliable to apply.

Claims

1. A mechanics pressurization equipment that is used for knee joint nuclear magnetic resonance imaging when human horizontal position, its characterized in that: consists of a plantar mechanical pressurizing device (1) and a knee joint fixing device (2); the sole mechanical pressurizing device (1) comprises a base plate (3) and a pressurizing unit (4), wherein two first sliding grooves (5) which are parallel to each other are formed in the base plate (3), a binding belt fixing hole (12) is formed in the base plate (3), the pressurizing unit (4) comprises a sliding bottom plate (6), a sliding block which is connected with the first sliding grooves (5) in a sliding mode is arranged on the lower surface of the sliding bottom plate (6), and a back plate (7) which is perpendicular to the sliding bottom plate is fixed on the upper surface of the sliding bottom plate (6); two second sliding chutes (8) which are parallel to the sliding bottom plate (6) are fixed on one surface of the back plate (7), a sliding plate (9) is arranged between the two second sliding chutes (8) and is in sliding connection with the second sliding chutes (8), a circular fixed disc (16) is fixed on the sliding plate (9), and a pressure sensor (10) is fixed at the circle center of the fixed disc (16); a screw transmission mechanism (11) is fixed on the other surface of the back plate (7); the fixing device is characterized in that the sliding plate (9) is provided with two pairs of bandage fixing holes (12) which are symmetrical by the diameter of a fixing disc perpendicular to the base plate (3), the angle between the diameter of the two bandage fixing holes (12) in the middle and the diameter of the fixing disc perpendicular to the base plate (3) is 7 degrees, the angle between the diameter of the two bandage fixing holes (12) on the two sides and the diameter of the fixing disc perpendicular to the base plate (3) is 20 degrees, the knee joint fixing device (2) comprises a round tube type knee joint sleeve (13) and two pairs of fixing arms (14), the fixing arms (14) are provided with the bandage fixing holes (12), rotating shafts (15) with opposite sides are fixed through the knee joint sleeve (13), and each rotating shaft (15) is connected with one pair of fixing arms (14).

2. The mechanical compression device for magnetic resonance imaging of the knee joint in the recumbent position of the human body as claimed in claim 1, wherein: a limiting device is arranged between the fixed arms (14) and the rotating shaft (15), and each fixed arm (14) can rotate around the rotating shaft (15) and the axis of the knee joint sleeve (13) within the range of 0-15 degrees.

3. The mechanical compression device for magnetic resonance imaging of the knee joint in the recumbent position of the human body as claimed in claim 1, wherein: the base plate (3) is provided with a spiral transmission groove (17), and the transmission groove (17) is in transmission connection with a screw rod in the spiral transmission mechanism (11).

4. The mechanical compression device for magnetic resonance imaging of the knee joint in the recumbent position of the human body as claimed in claim 1, wherein: the sole mechanics pressurizing device (1) and the knee joint fixing device (2) are made of polyformaldehyde resin and are connected through rivets made of paramagnetic alloy materials such as titanium alloy or aluminum alloy, and the sole mechanics sensor is made of aluminum alloy.