Nuclear magnetic resonance rectal cancer scanning auxiliary device

By designing a syringe with positioning expansion capsule and ball valve block in the examination of NMR rectal cancer, the problems of outward movement of the diversion tube and contrast agent outflow are solved, and the stability of the diversion tube and accurate injection of contrast agent are achieved. Improves the accuracy and convenience of inspection.

CN222285461UActive Publication Date: 2025-01-03CHANGCHUN YINGHE MEDICAL IMAGING DIAGNOSIS CENT CO LTD
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Patent Information

Application Number
CN202420505882.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-03-15
Publication Date
2025-01-03
Estimated Expiration
2034-03-15

AI Technical Summary

Technical Problem

When performing NMR rectal cancer examination, existing contrast agent syringes are prone to cause contrast agent outflow and diversion of the diversion tube, affecting the accuracy of the examination.

Method used

A syringe consisting of a syringe, a piston push rod, a plug and a flow guide assembly is designed to increase anal friction by positioning the expansion capsule, and combine the ball valve block and return spring to achieve segmented conduction and sealing of the passage to ensure flow guide The stability of the tube and the segmented injection of contrast agent is achieved through the limiting bump and extrusion block.

Benefits of technology

It effectively avoids the outward movement of the flow guide, simplifies operation, ensures stable injection of contrast agent, and improves the accuracy and convenience of inspection.

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Abstract

The utility model discloses a nuclear magnetic resonance rectal cancer scanning auxiliary device, which relates to the technical field of medical instruments and comprises an injector composed of an injection cylinder, a piston push rod and a plug, the bottom of the plug is fixedly connected with an injection head, and the injection head is located at the eccentric position of the bottom of the plug. The injector injects a contrast agent into the rectum of a patient through the flow guide assembly; the flow guide assembly comprises an injection unit, a positioning unit, a valve unit and a connection locking unit. The positioning expansion bag is arranged, the flow guide tube can be kept in a stable state through friction force between the expanded positioning expansion bag and the anus of a patient, the flow guide tube is effectively prevented from moving outwards, meanwhile, other parts in the flow guide assembly are matched with the injection head, the limiting protruding block and the extrusion round block, and the flow guide tube is more stable. Segmented operation of expansion and contraction of the positioning expansion bag and injection of the contrast agent can be achieved, and the whole operation is simple and convenient.
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Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a nuclear magnetic resonance (NMR) scanning auxiliary device for rectal cancer. Background Art

[0002] Nuclear magnetic resonance is the process in which non-zero spin atomic nuclei absorb electromagnetic waves of a specific frequency and undergo energy level transitions under the action of an external magnetic field. Non-zero spin atomic nuclei have magnetic moments, and their spin energy levels undergo Zeeman splitting under the action of an external magnetic field. Nuclear magnetic resonance spectroscopy is a branch of spectroscopy, and its resonance frequency is in the radio frequency band. The application of nuclear magnetic resonance and magnetic resonance imaging (MRI) examinations have become a common imaging examination method.

[0003] Rectal cancer refers to the cancer between the dentate line and the junction of the rectum and sigmoid colon. It is one of the most common malignant tumors in the digestive tract. Enhanced MRI is one of the effective means to examine rectal cancer. The principle of enhanced MRI is to determine the type or nature of the lesion based on the different density, blood supply and signal strength between the lesion tissue and normal tissue. After receiving contrast agent, enhanced MRI can scan more sequences, making a clearer and more precise judgment by taking advantage of the different functional sources of blood supply between lesions and normal tissues, different MRI signals after taking contrast agent, and different time, sequence and morphology of lesion enhancement.

[0004] Therefore, when performing rectal cancer examination through enhanced magnetic resonance imaging, it is necessary to inject contrast agent (also known as contrast agent) into the patient's intestine. Existing contrast agent injection into the rectum is mostly done through an ordinary syringe. During this process, the tube inserted into the human body is prone to outward movement, which can easily cause the contrast agent to flow out. Based on this, an magnetic resonance imaging auxiliary device for rectal cancer scanning is provided. Utility Model Content

[0005] The purpose of the utility model is to provide a nuclear magnetic resonance (NMR) scanning auxiliary device for rectal cancer in order to solve the above-mentioned problems.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a nuclear magnetic resonance (NMR) scanning auxiliary device for rectal cancer, comprising a syringe consisting of a syringe, a piston push rod, and a plug, wherein the piston push rod extends from the top of the syringe to the inside of the syringe, the plug is fixed to the bottom of the syringe, the bottom of the plug is fixedly connected with an injection head, the injection head is located at an eccentric position at the bottom of the plug, and the syringe injects a contrast agent into the patient's rectum through a guide assembly;

[0007] The flow guide assembly includes an injection unit, a positioning unit, a valve unit, and a connection locking unit;

[0008] The injection unit is used to guide the contrast medium in the syringe to the inside of the patient's rectum;

[0009] The positioning unit is used to increase the friction between the injection unit and the patient's anus to prevent the injection unit from being offset;

[0010] The valve unit is used to realize the connection and cutoff of the channel between the injection unit, the positioning unit and the syringe;

[0011] The connection locking unit is used to realize the connection locking operation between the syringe and the injection unit.

[0012] As a further solution of the utility model: the injection unit includes a guide tube, a docking joint, and a first convex through hole;

[0013] The docking joint is fixed to one end of the drainage tube, the docking joint is used to dock with the plug, and the end of the drainage tube away from the docking joint is used to be inserted into the patient's body;

[0014] The first convex through hole is provided in the docking head and communicates with the guide tube. When the injection head is aligned with the first convex through hole, communication between the injector and the guide tube is achieved.

[0015] As a further solution of the utility model: the positioning unit includes a positioning expansion bag, a connecting tube, and a second convex through hole;

[0016] The positioning expansion bag is fixed on the outside of the drainage tube. When the drainage tube is inserted into the patient's body, the positioning expansion bag is located at the patient's anus. The expansion of the positioning expansion bag increases the friction between the patient and the anus.

[0017] The connecting tube is arranged on the inner side of the guide tube, one end of the connecting tube is in communication with the inner cavity of the positioning expansion bag, and the other end of the connecting tube is fixedly connected to the docking head;

[0018] The second convex through hole is disposed inside the butt joint and communicates with the connecting pipe. The second convex through hole and the first convex through hole are distributed along the circumferential direction.

[0019] As a further solution of the utility model: the valve unit includes a ball valve block and a return spring;

[0020] The ball valve block and the return spring are provided in two groups, and the two groups of the ball valve blocks and the return spring are respectively distributed inside the first convex through hole and the second convex through hole, and the return spring is located at one end of the ball valve block, and the end of the ball valve block away from the return spring protrudes to the inner side of the docking joint;

[0021] When the injection head contacts the ball valve block, the ball valve block contracts and squeezes the reset spring to contract to achieve conduction of the first convex through hole or the second convex through hole. When the injection head is separated from the ball valve block, the ball valve block resets to block the first convex through hole and the second convex through hole.

[0022] As a further solution of the utility model: the connection locking unit includes a limiting guide groove, and the limiting guide groove is opened on the inner side of the docking head;

[0023] The limiting guide groove is composed of a butt joint straight groove and a fan-shaped guide groove, wherein the fan-shaped guide groove is distributed at one end of the butt joint straight groove, and the other end of the butt joint straight groove penetrates to the outer end of the butt joint;

[0024] A limiting protrusion is integrally formed on the outer side surface of the plug, and the limiting protrusion slides into the fan-shaped guide groove to achieve connection locking between the plug and the docking head.

[0025] As a further solution of the utility model: the docking straight groove, the second convex through hole, and the first convex through hole are distributed in a circular shape with the center of the docking joint as the center, and the distribution angle is 270 degrees, and the injection head is aligned with the limiting protrusion;

[0026] As a further solution of the utility model: an extrusion round block is arranged at the center position of the bottom of the injection head, and the side surface of the extrusion round block is fixedly connected to the inner wall of the injection head through a connecting rod.

[0027] Compared with the prior art, the beneficial effects of the utility model are:

[0028] By setting up a positioning expansion bag and the friction between the expanded positioning expansion bag and the patient's anus, the drainage tube can be kept in a stable state, effectively preventing the drainage tube from moving outward. At the same time, through the cooperation of other parts inside the drainage assembly with the injection head, limiting protrusion and extrusion round block, the expansion and contraction of the positioning expansion bag and the injection of contrast agent can be achieved in segments, and the overall operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the utility model;

[0030] Figure 2 This is a schematic diagram of the internal structure of the butt joint of the utility model;

[0031] Figure 3 It is a structural cross-sectional view of the flow guide component of the utility model.

[0032] In the figure: 1. syringe; 101. syringe barrel; 102. piston push rod; 103. plug; 104. injection head; 105. limit convex block; 106. extrusion round block; 2. guide assembly; 201. guide tube; 202. positioning expansion bag; 203. connecting tube; 204. docking joint; 205. first convex through hole; 206. second convex through hole; 207. ball valve block; 208. return spring; 209. limit guide groove; 2091. docking straight groove; 2092. fan-shaped guide groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] See also Figures 1 to 3 In an embodiment of the utility model, a nuclear magnetic resonance scanning auxiliary device for rectal cancer includes a syringe 1 composed of a syringe 101, a piston push rod 102, and a plug 103. The piston push rod 102 extends from the top of the syringe 101 to the inside of the syringe 101. The plug 103 is fixed to the bottom of the syringe 101. The bottom of the plug 103 is fixedly connected with an injection head 104. The injection head 104 is located at an eccentric position at the bottom of the plug 103. The syringe 1 injects a contrast agent into the patient's rectum through a guide assembly 2;

[0035] The flow guide assembly 2 includes an injection unit, a positioning unit, a valve unit, and a connection locking unit;

[0036] The injection unit is used to guide the contrast medium in the syringe 101 to the inside of the patient's rectum;

[0037] The positioning unit is used to increase the friction between the injection unit and the patient's anus to prevent the injection unit from shifting;

[0038] The valve unit is used to realize the connection and cutoff of the channel between the injection unit, the positioning unit and the syringe 1;

[0039] The connection locking unit is used to realize the connection locking operation between the syringe 1 and the injection unit;

[0040] The injection unit includes a flow guide tube 201, a docking joint 204, and a first convex through hole 205;

[0041] The docking joint 204 is fixed to one end of the guide tube 201, and the docking joint 204 is used to dock with the plug 103. The end of the guide tube 201 away from the docking joint 204 is used to be inserted into the patient's body;

[0042] The first convex through hole 205 is formed on the docking head 204 and communicates with the flow guide tube 201. When the injection head 104 is aligned with the first convex through hole 205, the injection head 104 and the flow guide tube 201 are communicated with each other.

[0043] The positioning unit includes a positioning expansion bag 202, a connecting pipe 203, and a second convex through hole 206;

[0044] The positioning expansion bag 202 is fixed on the outside of the drainage tube 201. When the drainage tube 201 is inserted into the patient's body, the positioning expansion bag 202 is located at the patient's anus. The expansion of the positioning expansion bag 202 increases the friction between the patient and the anus.

[0045] The connecting tube 203 is arranged inside the flow guiding tube 201, one end of the connecting tube 203 is in communication with the inner cavity of the positioning expansion bag 202, and the other end of the connecting tube 203 is fixedly connected to the docking head 204;

[0046] The second convex through hole 206 is formed inside the butt joint 204 and communicates with the connecting pipe 203. The second convex through hole 206 and the first convex through hole 205 are distributed along the circumferential direction.

[0047] The valve unit includes a ball valve block 207 and a return spring 208;

[0048] Two groups of ball valve blocks 207 and return springs 208 are provided. The two groups of ball valve blocks 207 and return springs 208 are respectively distributed inside the first convex through hole 205 and the second convex through hole 206. The return spring 208 is located at one end of the ball valve block 207. The end of the ball valve block 207 away from the return spring 208 protrudes to the inner side of the docking head 204.

[0049] When the injection head 104 contacts the ball valve block 207, the ball valve block 207 contracts and squeezes the return spring 208 to contract to achieve the conduction of the first convex through hole 205 or the second convex through hole 206. When the injection head 104 separates from the ball valve block 207, the ball valve block 207 resets to block the first convex through hole 205 and the second convex through hole 206.

[0050] The connection locking unit includes a limiting guide groove 209, which is provided on the inner side of the docking head 204;

[0051] The limiting guide groove 209 is composed of a docking straight groove 2091 and a fan-shaped guide groove 2092. The fan-shaped guide groove 2092 is distributed at one end of the docking straight groove 2091, and the other end of the docking straight groove 2091 penetrates to the outer end of the docking head 204.

[0052] The outer side surface of the plug 103 is integrally formed with a limiting protrusion 105, and the limiting protrusion 105 slides into the fan-shaped guide groove 2092 to achieve connection and locking between the plug 103 and the docking head 204;

[0053] An extrusion round block 106 is provided at the bottom center of the injection head 104 , and the side surface of the extrusion round block 106 is fixedly connected to the inner wall of the injection head 104 via a connecting rod.

[0054] In this embodiment: it should be supplemented that: the transverse cross-section of the first convex through hole 205 and the second convex through hole 206 is a sideways "convex" shaped structure, the small-sized inner wall diameter of the first convex through hole 205 and the second convex through hole 206 is smaller than the diameter of the ball valve block 207, the large-sized inner wall of the first convex through hole 205 and the second convex through hole 206 is larger than the diameter of the ball valve block 207, and the end close to the docking joint 204 is small in size;

[0055] When contrast medium is injected into a patient, the steps are as follows:

[0056] First, the drainage tube 201 is inserted into the body through the anus of the patient, and the positioning expansion bag 202 is located at the position of the anus of the patient (it should be noted that the positioning expansion bag 202 is in an unexpanded state at this time, and the Figure 1 , 2 3 ), and then the contrast agent is sucked into the syringe 101 through the syringe 1;

[0057] Then, the plug 103 is docked with the docking head 204, and the limiting protrusion 105 is aligned with the docking straight groove 2091 and inserted, and then the injection cylinder 101 is rotated to make the limiting protrusion 105 move along the trajectory of the fan-shaped guide groove 2092. At the same time, the injection head 104 synchronously moves in a circular motion and approaches the second convex through hole 206;

[0058] When the injection head 104 contacts the ball valve block 207 in the second convex through hole 206, the ball valve block 207 will be squeezed to shrink toward the second convex through hole 206. Finally, the injection head 104 and the second convex through hole 206 are aligned. At this time, the ball valve block 207 fits with the end of the extruded round block 106 (this state can be determined by the vibration and force changes of the ball valve block 207 during the expansion and contraction process). At this time, the ball valve block 207 is in a contracted state, and the second convex through hole 206 and the injection head 104 are in a conductive state.

[0059] At this time, the piston push rod 102 can be pushed, so that part of the contrast agent in the syringe 101 flows into the interior of the positioning expansion bag 202 through the plug 103, the inner cavity of the injection head 104, the second convex through hole 206, and the connecting tube 203 in sequence, so that the positioning expansion bag 202 expands, and the positioning expansion bag 202 and the patient's anus form a squeezing and positioning effect;

[0060] Then, the injection cylinder 101 is rotated again to separate the injection head 104 from the second convex through hole 206 and move closer to the first convex through hole 205. After the injection head 104 is separated from the second convex through hole 206, the ball valve block 207 inside the second convex through hole 206 is automatically reset to achieve the blocking of the second convex through hole 206, thereby ensuring the stable expansion of the positioning expansion bag 202.

[0061] When the injection head 104 is aligned with the first convex through hole 205, the piston push rod 102 is pressed again, and the contrast agent is injected into the patient's rectum through the first convex through hole 205 and the drainage tube 201. During this process, the drainage tube 201 can be kept stable by the friction between the positioning expansion bag 202 and the patient's anus, effectively preventing the drainage tube 201 from moving outward.

[0062] After the contrast agent injection is completed, the syringe 101 is rotated in the opposite direction to align it with the second convex through hole 206 again. At this time, the piston push rod 102 can be pulled in the opposite direction to extract the contrast agent in the positioning expansion bag 202, causing the positioning expansion bag 202 to shrink, and then the guide tube 201 can be removed from the patient's body.

[0063] Please refer to Figures 1 to 3 The docking straight groove 2091, the second convex through hole 206, and the first convex through hole 205 are distributed in a circular shape with the center of the docking joint 204 as the center, and the distribution angle is 270 degrees. The injection head 104 and the limiting protrusion 105 are aligned.

[0064] In this embodiment: through this structure, the injection head 104 and the limiting protrusion 105 are rotated synchronously, and the injection head 104 is aligned with the second convex through hole 206 and the first convex through hole 205 in turn to achieve the expansion of the positioning expansion bag 202 and the contrast agent injection operation.

[0065] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A nuclear magnetic resonance imaging (NMR) assisting device for rectal cancer scanning, comprising a syringe (1) consisting of a syringe barrel (101), a piston push rod (102), and a plug (103), wherein the piston push rod (102) extends from the top of the syringe barrel (101) to the inside of the syringe barrel (101), and the plug (103) is fixed to the bottom of the syringe barrel (101), characterized in that: The bottom of the plug (103) is fixedly connected to an injection head (104), the injection head (104) being located at an eccentric position at the bottom of the plug (103), and the syringe (1) injects the contrast agent into the patient's rectum through the diversion component (2); The flow guide assembly (2) comprises an injection unit, a positioning unit, a valve unit, and a connection locking unit; The injection unit is used to guide the contrast medium inside the syringe (101) to the inside of the patient's rectum; The positioning unit is used to increase the friction between the injection unit and the patient's anus to prevent the injection unit from being offset; The valve unit is used to realize the connection and disconnection of the channel between the injection unit, the positioning unit and the syringe (1); The connection locking unit is used to implement a connection locking operation between the syringe (1) and the injection unit.

2. The MRI scanning auxiliary device for rectal cancer according to claim 1, characterized in that: The injection unit comprises a flow guide tube (201), a docking joint (204), and a first convex through hole (205); The docking joint (204) is fixed to one end of the drainage tube (201), the docking joint (204) is used to dock with the plug (103), and one end of the drainage tube (201) away from the docking joint (204) is used to be inserted into the patient's body; The first convex through hole (205) is formed on the docking head (204) and is in communication with the flow guide tube (201); when the injection head (104) is aligned with the first convex through hole (205), communication between the injection head (1) and the flow guide tube (201) is achieved.

3. The MRI scanning auxiliary device for rectal cancer according to claim 2, characterized in that: The positioning unit comprises a positioning expansion bag (202), a connecting pipe (203), and a second convex through hole (206); The positioning expansion bag (202) is fixed to the outside of the drainage tube (201); when the drainage tube (201) is inserted into the patient's body, the positioning expansion bag (202) is located at the patient's anus, and the friction between the positioning expansion bag (202) and the patient's anus is increased by expanding the positioning expansion bag (202); The connecting tube (203) is arranged on the inner side of the guide tube (201), one end of the connecting tube (203) is in communication with the inner cavity of the positioning expansion bag (202), and the other end of the connecting tube (203) is fixedly connected to the docking head (204); The second convex through hole (206) is disposed inside the docking joint (204) and is in communication with the connecting pipe (203); the second convex through hole (206) and the first convex through hole (205) are distributed along the circumferential direction.

4. The MRI scanning auxiliary device for rectal cancer according to claim 3, characterized in that: The valve unit comprises a ball valve block (207) and a return spring (208); The ball valve block (207) and the return spring (208) are provided in two groups, and the two groups of the ball valve block (207) and the return spring (208) are respectively distributed inside the first convex through hole (205) and the second convex through hole (206), and the return spring (208) is located at one end of the ball valve block (207), and the end of the ball valve block (207) away from the return spring (208) protrudes to the inner side of the docking head (204); When the injection head (104) contacts the ball valve block (207), the ball valve block (207) contracts and squeezes the return spring (208) to contract, thereby achieving conduction of the first convex through hole (205) or the second convex through hole (206); when the injection head (104) is separated from the ball valve block (207), the ball valve block (207) is reset to achieve blocking of the first convex through hole (205) or the second convex through hole (206).

5. The MRI scanning auxiliary device for rectal cancer according to claim 3, characterized in that: The connection locking unit comprises a limiting guide groove (209), and the limiting guide groove (209) is opened on the inner side of the docking head (204); The limiting guide groove (209) is composed of a docking straight groove (2091) and a fan-shaped guide groove (2092), wherein the fan-shaped guide groove (2092) is distributed at one end of the docking straight groove (2091), and the other end of the docking straight groove (2091) penetrates to an outer end of the docking joint (204); A limiting protrusion (105) is integrally formed on the outer side surface of the plug (103), and the limiting protrusion (105) slides into the fan-shaped guide groove (2092) to achieve connection locking between the plug (103) and the docking head (204).

6. The MRI scanning auxiliary device for rectal cancer according to claim 5, characterized in that: The docking straight groove (2091), the second convex through hole (206), and the first convex through hole (205) are distributed in sequence in a ring shape with the center of the docking joint (204) as the center, and the distribution angle is 270 degrees. The injection head (104) and the limiting protrusion (105) are in an aligned state.

7. The MRI scanning auxiliary device for rectal cancer according to claim 5, characterized in that: An extrusion round block (106) is provided at the center of the bottom of the injection head (104), and the side surface of the extrusion round block (106) is fixedly connected to the inner wall of the injection head (104) via a connecting rod.