CN111603165B - A positioning device for nuclear magnetic resonance imaging and its application method - Google Patents

Abstract

The invention proposes a positioning device for nuclear magnetic resonance imaging and a method for using it. The positioning device includes a wearable conical shell, the conical shell is composed of a warp rod and a weft coil intersecting, and the intersecting warp rod and weft coil The first developing capsule is arranged at the point, the first hollow pipe connecting with each other is arranged in the warp thread rod and the weft coil, the upper end of the conical shell is provided with an air suction port communicating with the first hollow pipe, and the air suction port is connected with the vacuum hose , the inner wall of the weft coil is evenly distributed along the circumferential direction with first air outlet holes communicating with the first hollow pipe, and the opening end of the conical shell is provided with a detachable expansion shell. The present invention absorbs the weft coil on the surface of the breast through the cooperation of the hollow pipe, the air outlet and the air outlet, and can fix the shape of the mammary gland regardless of whether the MRI is lying prone or supine, avoiding the influence of the tumor location due to the mobility of the mammary soft tissue accuracy.

Description

A positioning device for nuclear magnetic resonance imaging and its application method

technical field

The invention relates to the technical field of medical devices, in particular to a positioning device for nuclear magnetic resonance imaging and a usage method.

Background technique

Breast tumor is one of the important diseases that affect women's health. It is more likely to occur in the outer and upper quadrant of the breast, and a single lump in one breast is more common. Symptoms and signs may be accompanied by pain, nipple changes, nipple discharge, and changes in breast shape. In addition to routine examinations such as mammography and breast ultrasound, biopsy is the gold standard for diagnosis. Surgery and radiofrequency ablation play an important role in the diagnosis, staging and comprehensive treatment of breast cancer. However, since the mammary gland is composed of skin, fibrous tissue, mammary glands, and fat, it has considerable mobility and mobility. The position of the receptor affects the shape and mobility of the supine and prone positions. Therefore, accurate positioning of breast tumors Pathological biopsy and radiofrequency ablation treatment have brought great operational difficulties, and the deformability of the breast also causes uncertainty in the position of the located tumor, making the judgment of the soft tissue lesion area inaccurate, bringing certain complications and increasing operational risk.

Magnetic resonance imaging technology has high soft tissue resolution and accuracy, and can provide real-time, non-invasive, in vivo tissue information. During clinical work, medical workers can use the images provided by magnetic resonance to monitor the tumor area in real time, determine the location of breast tumors, and accurately implement relevant diagnosis and treatment operations in combination with imaging data to prolong the survival time of patients. At present, in the localization treatment of breast tumors in clinical work, as well as the auxiliary monitoring of MRI, patients are often instructed to adopt a prone position to make the bilateral breasts sag naturally, or use a supporting device to squeeze and fix the breasts, but this method is left to the doctor. The operating space is limited, and the long-term compression and fixation of the breast can easily bring discomfort to the patient and reduce compliance.

CN109770902A discloses an automatic tumor positioning system for nuclear magnetic resonance environment, which includes a soft tissue clamping device. When the patient lies prone, the mammary gland is placed in the soft tissue clamping device. This structure has the following defects: The remaining operating space is limited; 2. How to customize the soft tissue clamping device according to the patient's breast is poor in universality; 3. It only plays a role in supporting the breast and is not connected with the skin of the breast. Due to the large local deformation caused by the treatment operation, the accuracy of positioning is affected.

CN109499015A discloses a breast positioning component and a breast positioning device. The positioning component corresponds to the top of the patient’s breast. Air is delivered to the positioning component through an air pump, an external connection tube and a connecting tube, and the patient’s breast is sucked up. The tumor on the top and bottom of the patient's breast is positioned. This structure has the following problems: the breast is completely covered by the positioning part, which makes it difficult for the doctor to check the status of the breast. The position of the breast positioning device is fixed, which is not convenient for the doctor to adjust as needed.

CN109363769A discloses a magnetic resonance positioning device and positioning method, the positioning layer is a rectangular array, the number of rows and columns of the rectangular array is the same, each positioning point is fixed with a group of developer, and the developer is used to set the positioning point in groups, making the positioning point easier identify. Due to the softness and mobility of the mammary gland, it is not convenient to fix the shape of the mammary gland.

Contents of the invention

The present invention proposes a positioning device for nuclear magnetic resonance imaging and a method of use. Through the cooperation of the hollow pipe, the air outlet and the air suction port, the weft coil is adsorbed on the surface of the breast, and it can be fixed regardless of whether the nuclear magnetic resonance imaging is prone or supine. The shape of the breast avoids affecting the accuracy of tumor location due to the mobility of breast soft tissue.

The technical solution of the present invention is achieved in the following way: a positioning device for nuclear magnetic resonance imaging, including a wearable conical shell, the conical shell is composed of a warp rod and a weft coil crossed, the warp rod and the weft coil The intersection point is provided with the first developing capsule, the warp thread rod and the weft coil are provided with the first hollow pipe connecting with each other, the upper end of the conical shell is provided with the air suction port communicating with the first hollow pipe, and the air suction port is connected with the vacuum hose. Connected, the inner wall of the weft coil is evenly distributed along the circumferential direction with first air outlet holes communicating with the first hollow pipe, and the opening end of the conical shell is provided with a detachable expansion shell.

Further, the expansion casing includes an expansion coil, and the expansion coil is provided with an expansion rod corresponding to the warp rod one by one, and a second developing capsule is provided at the intersection of the expansion rod and the expansion coil, and a There are second hollow pipes that communicate with each other, and the inner wall of the expansion coil is uniformly distributed along the circumferential direction with second air outlets that communicate with the second hollow pipe. The end of the expansion wire rod that is close to the weft coil is provided with a quick plug. The transition pipe connected by the two hollow pipes, the weft coil adjacent to the extended wire rod is provided with a first socket for matching with the quick plug-in, the first socket is provided with a first sealing rubber ring, and the first socket is provided with an optional Open the first seal assembly.

Further, the first sealing assembly includes a sealing cover, a rotating shaft and a screw rod. The rotating shaft is arranged outside the first socket. One end of the sealing cover is a free end, and the other end is rotatably connected to the rotating shaft. A torsion spring is set on the rotating shaft, and the screw rod is arranged on the sealing One side of the cover is connected with the thread of the weft coil, and the opening and closing of the sealing cover is controlled by turning the screw rod.

Further, the quick plug-in includes a connection box communicated with the second hollow pipe, an insertion rod is arranged at one end of the connection box close to the weft coil, and a transition pipe communicated with the connection box is arranged axially through the insertion rod, and the insertion rod is close to the connection box One end of the card slot is provided with a card slot matched with the sealing cover, and the end of the card slot away from the connection box is provided with a second sealing rubber ring.

Further, first one-way valves corresponding to the first air outlets are arranged in the first hollow pipe, and second one-way valves corresponding to the second air outlets are arranged in the second hollow pipe.

Further, the end of the expansion coil away from the expansion rod is provided with a second insertion hole corresponding to the quick plug-in one-to-one, and an openable second sealing assembly is provided at the second insertion hole.

Further, the inner walls of the weft coil and the expansion coil are all provided with a sealing rubber layer, the inner side of the sealing rubber layer is provided with an inner lining layer, and the sealing rubber layer and the inner lining layer are all provided with the first air outlet or the second air outlet. One-to-one corresponding vias.

A method for using a positioning device for magnetic resonance imaging, comprising the following steps:

(1) The open end of the conical shell is sequentially connected with n expansion shells along the axis, where n is an integer and ≥0;

(2) Wear the conical shell at the position to be detected, connect the vacuum hose to the vacuum device, vacuumize the first hollow pipe and the second hollow pipe, and the weft coil and the expansion coil are adsorbed on the air outlet through the air outlet. At the position to be detected, the position to be detected is fixed;

(3) Perform nuclear magnetic resonance imaging at the position to be detected, and perform target positioning through the developing capsule.

Further, when n=0, the sealing cover is located at the first socket, the screw rod is located at one side of the sealing cover, the sealing cover is restricted from rotating due to the torsion spring, and the sealing cover squeezes the first sealing rubber ring to realize the sealing of the first socket .

Further, when n=1, the screw rod on the weft coil is rotated outward, the sealing cover is rotated outward under the action of the torsion spring, the first jack is opened, and the insertion rod of the expansion housing is inserted into the first jack, The first sealing rubber ring and the second sealing rubber ring cooperate to realize the sealing of the joint between the insertion rod and the first socket, and then rotate the screw inward, and the screw pushes the sealing cover to rotate in the direction of the first socket, and the edge snaps in In the card slot, the insertion rod is prevented from falling off from the first socket, the connection between the expansion shell and the conical shell is completed, and the sealing communication between the first hollow pipe and the second hollow pipe is completed.

Further, when n is an integer and ≥ 2, the adjacent expansion housings are connected to the corresponding quick connectors through the second socket.

Beneficial effects of the present invention:

1. The present invention absorbs the weft coil on the surface of the breast through the cooperation of the hollow pipe, the air outlet and the air suction port. No matter whether the MRI is prone or supine, the shape of the breast can be fixed, and it provides a large operation for the doctor's subsequent treatment. Space, to avoid affecting the accuracy of tumor location due to the mobility of breast soft tissue;

2. The present invention is convenient to adapt to different sizes of mammary glands by providing a detachable expansion shell. The expansion shell is provided with a second hollow pipe that penetrates through each other. Through the cooperation of jacks, quick plugs and sealing components, the expansion shell and the sealing assembly are realized. The conical shell and the adjacent conical shell are quickly sealed and connected to realize the simultaneous vacuuming of the first hollow pipe and the second hollow pipe; when the conical shell does not need to be expanded, the first sealing component can ensure that the first hollow pipe tightness;

3. The present invention sets a sealing rubber layer and an inner lining layer inside the weft coil and the expansion coil, and the inner lining layer is close to the skin at the mammary gland to increase skin comfort; because the breast has a certain curvature and is non-planar, setting the inner lining layer has It is beneficial to adapt to breasts of different shapes and improve the stability of adsorption; in addition, by setting the first one-way valve and the second one-way valve and adopting the principle of sponge vacuum suction cup, even if there is a certain air outlet hole due to the shape of the breast that is not adsorbed, it will not be absorbed. Affects other vent holes, further mentioning the stability of the adsorption.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the outer structure schematic diagram of conical housing;

Fig. 2 is the inside structure schematic diagram of conical housing;

Fig. 3 is the sectional view of C-C of Fig. 2 among the embodiment one;

Fig. 4 is a schematic diagram of the outer structure of the expansion shell;

Fig. 5 is a partially enlarged view of A in Fig. 4;

Fig. 6 is the structural representation of the weft coil at the open end of the tapered housing;

Fig. 7 is a partially enlarged view of B in Fig. 6;

Fig. 8 is a structural schematic diagram when the first jack is opened;

Fig. 9 is the sectional view of C-C of Fig. 2 in embodiment three;

Fig. 10 is a schematic structural diagram of the first one-way valve.

Warp rod 1, weft coil 2, the first developing capsule 3, the first hollow pipe 4, the air inlet 5, the vacuum hose 6, the first air outlet 7, the sealing rubber layer 8, the inner lining layer 9, the through hole 10, the extension Coil 11, extension rod 12, second developing capsule 13, second hollow pipe 14, reinforcing ring 15, connecting box 16, inserting rod 17, transition duct 18, card slot 19, second sealing rubber ring 20, first inserting Hole 21, first sealing rubber ring 22, sealing cover 23, rotating shaft 24, screw rod 25, valve body 26, valve ball 27, spring 28, valve 29, support hole 30, different diameter hole 31, movable cavity 32, air hole 33.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment one

As shown in Figure 1-3, a positioning device for magnetic resonance imaging includes a wearable conical shell, the conical shell is composed of several warp rods 1 and several weft coils 2 intersecting, several One end of the warp rod 1 intersects with the tip of the conical shell, and the other end is inclined downward in an arc shape. Several coaxial weft coils 2 gradually increase in diameter from top to bottom, and are cross-connected with the warp rod 1 . The materials used in the present invention are all nuclear magnetic resonance compatible materials.

An installation slot is provided at the intersection of the warp rod 1 and the weft coil 2, and the first developing capsule 3 is fixed in the installation slot. The cross-sections of the first developing capsule 3 corresponding to different weft coils 2 are different, which is convenient for rapid positioning of tumor imaging. The cross section of the first developing capsule 3 at the intersection of the weft coil 2 and the remaining warp rod 1 may be the same or different, but they are all different from the warp rod 1 . The warp rod 1 and the weft coil 2 are provided with a first hollow pipe 4 that communicates with each other, and the upper end of the conical shell is provided with an air suction port 5 that communicates with the first hollow pipe 4, and the air suction port 5 is connected with a vacuum hose 6. The inner wall of the coil 2 is evenly distributed along the circumferential direction with the first air outlet 7 communicating with the first hollow pipe 4, the inner wall of the weft coil 2 is bonded and fixed with a sealing rubber layer 8, and the inner side of the sealing rubber layer 8 is bonded and fixed with a liner The layer 9 and the inner lining layer 9 can be made of non-magnetic sponge material, and the sealing rubber layer 8 and the inner lining layer 9 are provided with through holes 10 corresponding to the first air outlet holes 7 one by one.

The usage method of the present embodiment: the fixing belt can be installed on both sides of the open end of the conical housing, and during use, the conical housing is worn at the position to be detected, i.e. the mammary gland, the inner liner 9 and the skin of the mammary gland Adhering to each other increases skin comfort, and setting the inner lining layer 9 is conducive to adapting to breasts of different shapes. The conical shell is fixed on the human body through the fixing belt, the vacuum hose 6 is connected with the vacuum device, and the first hollow pipe 4 is vacuumed, and the weft coil 2 is adsorbed on the mammary gland through the first air outlet hole 7, and the mammary gland Fixation, no matter whether the patient is prone or supine during MRI, can ensure that the breast does not deform; perform MRI at the position to be detected, and use the imaging capsule to locate the tumor.

Embodiment two

This embodiment is basically the same as Embodiment 1, the difference is that: as shown in Figure 4-8, the open end of the conical shell is provided with a detachable expansion shell, the expansion shell includes an expansion coil 11, and the expansion coil 11 An expansion rod 12 corresponding to the warp rod 1 is fixed on the top, and a reinforcement ring 15 is fixed on the outside of the end of the expansion rod 12 away from the expansion coil 11, which is used to fix the expansion rod and facilitate subsequent insertion with the weft coil. A second developing capsule 13 is fixed at the junction of the expansion coil 12 and the expansion coil 11, the expansion coil 11 and the expansion coil 12 are provided with a second hollow pipe 14 that communicates with each other, and the inner wall of the expansion coil 11 is evenly distributed along the circumferential direction. The second air outlet connected by the second hollow pipe 14, the inner wall of the expansion coil 11 is also bonded and fixed with a sealing rubber layer 8, and the inner side of the sealing rubber layer 8 is also bonded and fixed with an inner lining layer 9, the sealing rubber layer 8 and the inner The lining layer 9 is also provided with through holes 10 that correspond one-to-one to the second air outlet holes.

An end of the expansion wire rod 12 near the weft coil 2 is fixed with a quick plug-in, and the quick plug-in includes a connection box 16 communicated with the second hollow pipe 14, and an end of the connection box 16 near the weft coil 2 is fixed with a plunger 17, and the inner edge of the plunger 17 is A transition pipe 18 communicating with the connection box 16 is provided in the axial direction. One end of the insertion rod 17 close to the connection box 16 is provided with a card slot 19 that cooperates with the sealing cover 23. The end of the card slot 19 away from the connection box 16 is fixed with a second seal. Apron 20.

The weft coil 2 adjacent to the extension wire rod 12 is provided with a first jack 21 that is matched with the quick plug-in, the first jack 21 is fixed with a first sealing rubber ring 22, and the first jack 21 is provided with an openable first seal assembly. The first sealing assembly includes a sealing cover 23, a rotating shaft 24 and a screw rod 25. The rotating shaft 24 is fixed on the outside of the first jack 21. One end of the sealing cover 23 is a free end, and the other end is connected to the rotating shaft 24 in rotation. The rotating shaft 24 is sleeved with a torsion spring. , The screw rod 25 is arranged on one side of the sealing cover 23, and is threadedly connected with the weft coil 2, and the opening and closing of the sealing cover 23 is controlled by rotating the screw rod 25.

The end of the expansion coil 11 away from the expansion rod 12 is provided with a second socket corresponding to the quick plug-in one-to-one, and an openable second sealing assembly is provided at the second socket, and the structure of the second sealing assembly is the same as that of the first sealing assembly. have the same structure.

The usage method of this embodiment: according to the different sizes of the breasts, n expansion shells are sequentially connected along the axis at the opening end of the conical shell, where n is an integer and ≥0:

When n=0, the conical shell can be used directly, the sealing cover 23 is located at the first socket 21, the screw rod 25 is located at one side of the sealing cover 23, and the rotation of the sealing cover 23 is limited, and the sealing cover 23 squeezes the first sealing The rubber ring 22 realizes the sealing of the first socket 21;

When n=1, the screw rod 25 on the weft coil 2 is rotated outwards, the sealing cover 23 is rotated outwards under the action of the torsion spring, the first jack 21 is opened, and the insertion rod 17 of the expansion housing is inserted into the first jack 21, the first sealing rubber ring 22 and the second sealing rubber ring 20 are extruded to realize the sealing of the joint between the insertion rod 17 and the first socket 21, and then the screw 25 is rotated inward, and the screw 25 pushes the sealing cover 23 to The direction of the first socket 21 rotates, and the edge snaps into the draw-in groove 19 to prevent the insertion rod 17 from falling off in the first socket 21, complete the connection between the expansion shell and the conical shell, and the first hollow pipe 4 and the second hollow pipe 4. The sealing of the two hollow pipes 14 communicates.

When n≧2, adjacent expansion shells are connected to the second sealing assembly through the second socket, and the connection method is the same as that of the first socket 21 and the first sealing assembly.

Embodiment three

This embodiment is basically the same as Embodiment 1 or 2, except that: as shown in Figures 9 and 10, a first one-way valve corresponding to the first air outlet 7 is provided in the first hollow pipe 4, and the first one-way valve corresponds to the first air outlet 7. A one-way valve includes a valve body 26, a valve ball 27 and a spring 28, and is provided with a valve 29. The valve body 26 is provided with a support hole 30, a different-diameter hole 31, a movable chamber 32 and a valve 29 in sequence along the axial direction, and the valve 29 Placed at the first air outlet hole 7 and communicated with the through hole 10, the support hole 30 is placed in the first hollow shell, and a plurality of air holes 33 are arranged on the side wall of the support hole 30, and the valve 29 and the first air hole are realized through the air holes 33. The connection of a hollow shell, the valve ball 27 is placed in the movable chamber 32, one end of the spring 28 is against the valve ball 27, and the other end is placed in the support hole 30, and the inner diameters of the support hole 30 and the valve 29 are smaller than the valve ball 27 The diameter of the movable chamber 32 is greater than the diameter of the valve ball 27. Second one-way valves corresponding to the second air outlets are provided in the second hollow pipe 14 , and the first one-way valve and the second one-way valve have the same structure.

The method of use of this embodiment: because the shape and size of the mammary glands are different, and the mammary glands are composed of soft tissues, the one-way valve of this embodiment cooperates with the first air outlet 7, and adopts the principle of sponge vacuum suction cups, which can also ensure soft tissues such as mammary glands Adsorption strength, even if a certain first air outlet 7 fails to adsorb on the mammary gland skin, it will not affect the vacuum adsorption of other first air outlets 7, so as to fix the mammary gland and facilitate tumor imaging and positioning.

Embodiment four

A method for using a positioning device for magnetic resonance imaging, comprising the following steps:

(1) The open end of the conical shell is sequentially connected with n expansion shells along the axis, where n is an integer and ≥ 0:

When n=0, the conical shell can be used directly, the sealing cover 23 is located at the first socket 21, the screw rod 25 is located at one side of the sealing cover 23, and the rotation of the sealing cover 23 is limited, and the sealing cover 23 squeezes the first sealing The rubber ring 22 realizes the sealing of the first socket 21;

When n=1, the screw rod 25 on the weft coil 2 is rotated outwards, the sealing cover 23 is rotated outwards under the action of the torsion spring, the first jack 21 is opened, and the insertion rod 17 of the expansion housing is inserted into the first jack 21, the first sealing rubber ring 22 and the second sealing rubber ring 20 cooperate to realize the sealing of the joint between the insertion rod 17 and the first socket 21, and then the screw 25 is rotated inward, and the screw 25 pushes the sealing cover 23 to the second One socket 21 rotates in one direction, and the edge snaps into the draw-in groove 19 to prevent the insertion rod 17 from falling off in the first socket 21, complete the connection between the expansion shell and the conical shell, and the first hollow pipe 4 and the second hollow pipe 4. The sealing communication of the hollow pipe 14;

When n is an integer, and ≥ 2, the adjacent expansion shells are connected to the corresponding fast plug-in through the second jack;

(2) Wear the conical shell on the mammary gland to be detected, connect the vacuum hose 6 with the vacuuming device, vacuumize the first hollow pipe 4 and the second hollow pipe 14, and weft coil 2 and expansion coil 11 Adsorb at the position to be detected through the first air outlet hole 7, and fix the position to be detected;

(3) Carry out nuclear magnetic resonance imaging at the position to be detected, and perform tumor localization through the developing capsule.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (9)

1. A positioning device for nuclear magnetic resonance imaging, including a wearable conical shell, the conical shell is composed of a warp rod (1) and a weft coil (2), which is characterized in that: the warp rod (1) ) and the weft coil (2) are provided with a first developing capsule (3), the warp rod (1) and the weft coil (2) are provided with a first hollow pipe (4) interpenetrating with each other, and the conical shell The upper end of the weft coil (2) is provided with a suction port (5) communicating with the first hollow pipe (4), and the suction port (5) is connected with the vacuum hose (6). The pipes (4) communicate with the first air outlet (7), and the opening end of the conical shell is provided with a detachable expansion shell; The expansion shell includes an expansion coil (11), and the expansion coil (11) is provided with an expansion pole (12) corresponding to the warp pole (1) one by one, and the junction of the expansion pole (12) and the expansion coil (11) A second developing capsule (13) is provided, a second hollow pipe (14) interpenetrating is arranged inside the expansion coil (11) and the expansion rod (12), and the inner wall of the expansion coil (11) is evenly distributed along the circumferential direction with the second The second air outlet hole connected to the two hollow pipes (14), the end of the expansion rod (12) close to the weft coil (2) is provided with a quick plug-in, and the quick plug-in is provided with a transition pipe ( 18), the weft coil (2) adjacent to the extension rod (12) is provided with a first socket (21) that is matched with the quick plug-in, and a first sealing rubber ring (22) is provided at the first socket (21) ), the first opening (21) is provided with an openable first sealing assembly. 2. A positioning device for nuclear magnetic resonance imaging according to claim 1, characterized in that: the first sealing assembly includes a sealing cover (23), a rotating shaft (24) and a screw (25), and the rotating shaft (24) is set On the outside of the first socket (21), one end of the sealing cover (23) is a free end, and the other end is connected to the rotating shaft (24) in rotation. A torsion spring is set on the rotating shaft (24), and the screw rod (25) is arranged on the sealing cover ( 23) and is threadedly connected with the weft coil (2), and the opening and closing of the sealing cover (23) is controlled by turning the screw rod (25). 3. A positioning device for nuclear magnetic resonance imaging according to claim 1 or 2, characterized in that the quick plug-in includes a connection box (16) communicating with the second hollow pipe (14), the connection box (16) An insertion rod (17) is arranged at one end close to the weft coil (2), and a transition pipe (18) communicating with the connection box (16) is arranged axially through the insertion rod (17), and the insertion rod (17) is close to the connection box One end of (16) is provided with a card slot (19) matching with the sealing cover (23), and the end of the card slot (19) away from the connection box (16) is provided with a second sealing rubber ring (20). 4. A positioning device for nuclear magnetic resonance imaging according to claim 1, characterized in that: the first hollow pipe (4) is provided with a first one-way corresponding to the first air outlet hole (7). Valves, second one-way valves corresponding to the second air outlets are arranged in the second hollow pipe (14). 5. A positioning device for nuclear magnetic resonance imaging according to claim 1, characterized in that: the end of the expansion coil (11) away from the expansion rod (12) is provided with a second plug corresponding to the quick plug hole, and an openable second sealing component is arranged at the second insertion hole. 6. A positioning device for nuclear magnetic resonance imaging according to claim 1, characterized in that: the inner walls of the weft coil (2) and the expansion coil (11) are provided with a sealing rubber layer (8), and the sealing rubber The inner side of the layer (8) is provided with an inner liner (9), and both the sealing rubber layer (8) and the inner liner (9) are provided with ventilation holes corresponding to the first air outlet (7) or the second air outlet. hole (10). 7. A method for using the positioning device for nuclear magnetic resonance imaging according to any one of claims 1-6, characterized in that it comprises the following steps: (1) The open end of the conical shell is sequentially connected with n expansion shells along the axis, where n is an integer and ≥0; (2) Wear the conical shell at the position to be tested, connect the vacuum hose (6) to the vacuuming device, and vacuum the first hollow pipe (4) and the second hollow pipe (14). The coil (2) and the expansion coil (11) are adsorbed at the position to be detected through the air outlet; (3) Carry out nuclear magnetic resonance imaging at the position to be detected, and perform target positioning through the developing capsule. 8. The use method according to claim 7, characterized in that: when n=1, the screw (25) on the weft coil (2) is rotated outwards, and the sealing cover (23) is outwards under the action of the torsion spring Rotate to open the first socket (21), insert the insertion rod (17) of the expansion shell into the first socket (21), and squeeze the first sealing rubber ring (22) and the second sealing rubber ring (20) Cooperate to realize the sealing of the joint between the insertion rod (17) and the first socket (21), then rotate the screw (25) inward, and the screw (25) pushes the sealing cover (23) to the first socket (21) direction, and the edge snaps into the card slot (19), preventing the insertion rod (17) from falling off from the first socket (21), completing the connection between the expansion shell and the conical shell, and the first hollow pipe (4 ) communicates with the seal of the second hollow pipe (14). 9. The use method according to claim 7, characterized in that: when n=0, the sealing cover (23) is located at the first insertion hole (21), the screw (25) is located at one side of the sealing cover (23), The sealing cover (23) is limited by the rotation of the torsion spring, and the sealing cover (23) squeezes the first sealing rubber ring (22) to realize the sealing of the first socket (21); when n≥2, the adjacent expansion shells pass through The second jack is connected to the corresponding quick connector.

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