A particle injector, pusher device and method of use that can pass over a guidewire

Abstract

The application belongs to the technical field of medical devices, and particularly relates to a particle implanting device capable of passing through a guide wire, a pushing device and a use method. The particle implanting device capable of passing through a guide wire comprises a body, a cavity for loading radioactive particles is arranged in the body, one end of the body is provided with a connecting table, a through hole for passing through a guide wire is arranged on the connecting table, the through hole comprises coaxial sections, a transition section and an inclined section which are sequentially communicated, the coaxial section is communicated with the free end of the connecting table, the central axis of the coaxial section coincides with the central axis of the connecting table, and the inclined section is inclined from inside to outside to the direction away from the free end of the connecting table and penetrates the outer wall of the connecting table. The purpose is to solve the problem of inconvenience caused by the structural defects of the prior art.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a particle implanter that can pass through a guidewire, a delivery device, and a method of use. Background Technology

[0002] Malignant strictures of the digestive tract are a common clinical condition. Among them, strictures caused by malignant tumors of the esophagus, stomach, intestines, and biliary tract are particularly prevalent in patients with digestive tract cancer. Besides surgical resection, radiotherapy, and chemotherapy, commonly used interventional treatments include balloon angioplasty (primarily for benign strictures) and stent placement. For patients with intermediate to advanced digestive tract cancer, stent placement is a crucial palliative treatment that can effectively improve their quality of life and prolong survival.

[0003] Currently, over a hundred types of medical stents are used in the clinical treatment of various benign and malignant cavitary stenosis conditions. Cavity stents rely on their radial support force to open up the narrowed area, effectively relieving cavitary obstruction and improving patients' quality of life. Cavity stents equipped with radioactive particles also provide internal radiotherapy, offering advantages that external radiotherapy lacks, such as continuous, low-dose, and precise internal irradiation, thus reducing the risk of damage to surrounding normal tissues.

[0004] Chinese utility model patent (publication number: CN211863596U) discloses an internal radiotherapy stent capable of carrying radioactive particles. It achieves particle placement by the cooperation of radioactive particle chains, elastic mesh fabric and stent, with the elastic mesh fabric supporting the radioactive particle chains and the elastic mesh fabric being placed in the middle of the stent.

[0005] However, in actual use, because the radioactive particle chain, elastic mesh and stent are connected together, once the radioactive particle implantation time exceeds the effective treatment period, the entire structure must be replaced, which is inconvenient. Summary of the Invention

[0006] The purpose of this invention is to provide a particle implanter, delivery device, and method of use that can pass through a guide wire, in order to solve the problem of inconvenience caused by structural defects in the prior art.

[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0008] A guidewire-accessible particle implanter includes: a body;

[0009] The body has an internal cavity for loading radioactive particles;

[0010] One end of the body is provided with a connecting platform, and the connecting platform is provided with a through hole for passing through the guide wire. The through hole includes a coaxial section, a transition section and an inclined section connected in sequence.

[0011] The coaxial section is connected to the free end of the connecting platform, and the central axis of the coaxial section coincides with the central axis of the connecting platform.

[0012] The inclined section slopes from the inside out toward the free end away from the connecting platform and penetrates the outer wall of the connecting platform.

[0013] Further specified, the connecting platform is cone-shaped, with a smaller front and a larger rear.

[0014] This structural design, by setting the connecting platform in a cone shape that is smaller at the front and larger at the back, allows the main body to be inserted into the cavity more smoothly, making it highly practical.

[0015] Furthermore, the inner diameter of the cavity is smaller than the outer diameter of the radioactive particle.

[0016] This structural design, by limiting the size of the cavity, allows the radioactive particles to be fixed directly by the elasticity of the body after they are placed in the cavity, without the need for a separate fixing mechanism to fix the position of the radioactive particles in the cavity, making it more convenient to use.

[0017] Further specifying, a rope loop is fixedly connected to the end of the main body away from the connecting platform.

[0018] This structural design, with its rope loop, allows for easy removal and replacement of the implant when the particle implanter needs to be replaced. The rope loop can be directly grasped by the foreign body forceps on the endoscope, thus dragging the implanter away from the body, making it more convenient to use.

[0019] A delivery device includes a guidewire, a push rod, a cannula that can be inserted into an endoscopic biopsy channel, and a particle implanter that can pass through the guidewire as described above.

[0020] Both the main body and the push rod are inserted into the sleeve;

[0021] The end of the main body with the connecting platform is located outside the sleeve;

[0022] One end of the push rod is located inside the sleeve and abuts against the end of the body away from the connecting platform, while the free end of the push rod extends out of the sleeve away from the body.

[0023] The outer wall of the sleeve is fixedly provided with a secondary tube, and the guide wire passes through the secondary tube and the through hole.

[0024] This structural design allows the implant to be loaded into the endoscope via a cannula inserted into the biopsy channel, and then the guidewire to be supported by a secondary tube. This enables the implant to be smoothly pushed to the corresponding cavity position under the guidance of the guidewire and the push rod, and then fixed by the cavity support, making it more convenient to use.

[0025] Furthermore, the push rod is provided with a limiting platform at one end near the main body;

[0026] A pusher platform is also fixedly installed on the push rod;

[0027] The diameter of both the limiting platform and the push platform is larger than the diameter of the push rod.

[0028] A cavity support is placed between the limiting platform and the push table;

[0029] The limiting platform, the push platform, and the cavity support are all located inside the sleeve.

[0030] This structural design, through the setting of the limiting platform, the push platform and the cavity support, on the basis of the main body, the push rod and the sleeve, can use the sleeve to put the particle implanter into the corresponding cavity position, and then use the same sleeve to implant the cavity support for fixing the particle implanter into the cavity, thus forming a fixation of the particle implanter.

[0031] Alternatively, in the absence of a particle implanter, a cannula can be used to first insert a cavity stent into the cavity, and then the same cannula can be used to insert the particle implanter. This reduces the use of consumables, saves medical costs, and is highly practical.

[0032] Further specified, the sleeve has a marking point at one end near the body.

[0033] This structural design, through the setting of marker points and in conjunction with X-ray fluoroscopy, can more accurately determine the insertion position of the cannula, resulting in more precise positioning and greater practicality.

[0034] Further specified, a gripping sleeve is fixedly provided at the end of the sleeve away from the main body, and the push rod passes through the gripping sleeve;

[0035] A handle is fixedly provided at the end of the push rod away from the connecting platform.

[0036] This structural design, with its grip sleeve and handle, makes it easier to push and hold the sleeve and push rod, making it more convenient to use.

[0037] A method of using a pushing device includes the following steps:

[0038] 1) Place the radioactive particles into the cavity of the body;

[0039] 2) Place the body containing the radioactive particles and the push rod into the sleeve, with the connecting platform of the body located outside the sleeve and the free end of the push rod extending out of the sleeve away from the body.

[0040] 3) Insert the guidewire into the biopsy channel of the endoscope, so that the tip of the guidewire reaches the corresponding position and is placed within the field of vision of the endoscope;

[0041] 4) Insert the end of the guide wire sequentially into the through hole and the secondary tube;

[0042] 5) Simultaneously push the cannula and push rod so that the body, cannula and push rod reach the corresponding positions along the guide wire through the biopsy channel of the endoscope;

[0043] 6) Hold the push rod and pull the sleeve backward relative to the push rod, so that the sleeve moves backward relative to the push rod, thereby exposing the body outside the sleeve;

[0044] 7) Then remove the guidewire;

[0045] 8) Finally, remove the sleeve and push rod together.

[0046] A method of using a pushing device includes the following steps:

[0047] 1) Install the cavity support between the pusher and the limiting table;

[0048] 2) Insert the guidewire into the biopsy channel of the endoscope, so that the tip of the guidewire reaches the corresponding position and is placed within the field of vision of the endoscope;

[0049] 3) Insert the end of the guidewire into the secondary tube, and then simultaneously push the cannula and push rod so that the cavity support, cannula and push rod pass through the biopsy channel of the endoscope and reach the corresponding position along the guidewire;

[0050] 4) Hold the push rod and guide wire, and continue to pull the cannula backward relative to the push rod, so that the cannula moves backward relative to the push rod, thereby exposing the cavity stent outside the cannula. At this time, the cavity stent automatically expands, completes its own fixation, and pushes the guide wire against the outer wall.

[0051] 5) After that, with the guidewire in place, remove the cannula and push rod together from the biopsy channel of the endoscope, and then remove them from the guidewire.

[0052] 6) Hold the push rod and push the sleeve forward relative to the push rod to make room for the installation position of the main body at the front end of the sleeve;

[0053] 7) Place the radioactive particles into the cavity of the body;

[0054] 8) Place the body loaded with radioactive particles into the installation position at the front end of the sleeve, and make the connecting platform of the body outside the sleeve.

[0055] 9) Insert the end of the guide wire sequentially into the through hole and the secondary tube;

[0056] 10) Simultaneously push the cannula and push rod so that the body, cannula and push rod reach the position of the cavity stent along the guide wire through the biopsy channel of the endoscope;

[0057] 11) Hold the push rod and guide wire, and pull the sleeve backward relative to the push rod, so that the sleeve moves backward relative to the push rod, thereby exposing the body outside the sleeve and being pressed against the outer wall of the expanded cavity support.

[0058] 12) After that, remove the guide wire, and then remove the sleeve and push rod together.

[0059] The invention employing the above technical solution has the following advantages:

[0060] 1. Radioactive particles are loaded into the cavity of the body, and the movement of the body is guided by a guide wire inserted in the through hole, so that the particle implanter can smoothly reach the corresponding cavity position. The cavity support forms a fixed particle implanter. When the particle implanter needs to be replaced, the particle implanter loaded with radioactive particles can be removed separately and a new particle implanter can be implanted.

[0061] 2. With the rope loop design, when it is necessary to remove and replace the particle implanter, the rope loop can be directly grasped by the foreign body forceps on the endoscope, thereby dragging the particle implanter away from the human body, making it more convenient to use.

[0062] 3. The implant is loaded into the endoscope via a cannula that can be inserted into the biopsy channel, and the guidewire is supported by a secondary tube. This allows the implant to be smoothly pushed to the corresponding cavity position under the guidance of the guidewire and the push rod. The cavity support forms a fixation for the implant, making it more convenient to use.

[0063] 4. With this structural design, through the setting of the limiting platform, the push platform and the cavity support, based on the main body, the push rod and the sleeve, the particle implanter can be placed into the corresponding cavity position using the sleeve, and then the cavity support for fixing the particle implanter can be implanted into the cavity using the same sleeve, thus fixing the particle implanter.

[0064] Alternatively, in the absence of a particle implanter, a cannula can be used to first insert a cavity stent into the cavity, and then the same cannula can be used to insert the particle implanter. This reduces the use of consumables, saves medical costs, and is highly practical. Attached Figure Description

[0065] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0066] Figure 1This is a schematic diagram of the structure of the particle implanter in an embodiment of the present invention, which is a guidewire-accessible particle implanter, a delivery device, and a method of use.

[0067] Figure 2 This is a cross-sectional view of the particle implanter in an embodiment of the present invention, which is a guidewire-accessible particle implanter, a delivery device, and a method of use.

[0068] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0069] Figure 4 This is a schematic diagram illustrating the structure of an embodiment of the particle implanter, delivery device, and method of use that can pass through a guidewire according to the present invention. Figure 1 ;

[0070] Figure 5 This is a partial cross-sectional view of an embodiment of a guidewire-accessible particle implanter, delivery device, and method of use according to the present invention. Figure 1 ;

[0071] Figure 6 This is a partial cross-sectional view of an embodiment of a guidewire-accessible particle implanter, delivery device, and method of use according to the present invention. Figure 2 ;

[0072] Figure 7 This is a schematic diagram illustrating the structure of an embodiment of the particle implanter, delivery device, and method of use that can pass through a guidewire according to the present invention. Figure 2 ;

[0073] Figure 8 This is a partial cross-sectional view of an embodiment of a guidewire-accessible particle implanter, delivery device, and method of use according to the present invention. Figure 3 ;

[0074] Figure 9 This is a partial cross-sectional view of an embodiment of a guidewire-accessible particle implanter, delivery device, and method of use according to the present invention. Figure 4 ;

[0075] Figure 10 This is a partial cross-sectional view of an embodiment of a guidewire-accessible particle implanter, delivery device, and method of use according to the present invention. Figure 4 ;

[0076] Figure 11 This is a partial cross-sectional view of an embodiment of a guidewire-accessible particle implanter, delivery device, and method of use according to the present invention. Figure 5 ;

[0077] The symbols for the main components are explained below:

[0078] Guide wire 1

[0079] Body 2, Radioactive Particles 20, Connecting Platform 21

[0080] Through hole 210, coaxial section 211, transition section 212, inclined section 213

[0081] Rope loop 22

[0082] Sleeve 3, Grip sleeve 30, Sub-tube 31, Marking point 32

[0083] Push rod 4, handle 40, limit platform 41, push table 42

[0084] 5. Cavity stent. Detailed Implementation

[0085] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. In addition, directional terms mentioned in the embodiments, such as "up," "down," "top," "bottom," "left," "right," "front," and "back," are only for reference to the directions in the drawings and are not intended to limit the scope of protection of the present invention.

[0086] like Figures 1 to 8 As shown, a guidewire-accessible particle implanter of the present invention includes: a body 2;

[0087] The interior of the main body 2 is provided with a cavity for loading radioactive particles 20;

[0088] One end of the main body 2 is provided with a connecting platform 21, and a through hole 210 for passing through the guide wire 1 is provided on the connecting platform 21. The through hole 210 includes a coaxial section 211, a transition section 212 and an inclined section 213 connected in sequence.

[0089] The coaxial section 211 is connected to the free end of the connecting platform 21, and the central axis of the coaxial section 211 coincides with the central axis of the connecting platform 21.

[0090] The inclined section 213 is inclined from the inside out toward the free end away from the connecting platform 21 and penetrates the outer wall of the connecting platform 21.

[0091] The connecting platform 21 is cone-shaped, with a smaller front and a larger back.

[0092] In practice, the connecting platform 21 can also be set as a cylinder according to the actual situation. In this embodiment, the connecting platform 21 is set as a cone shape with a smaller front and a larger back, so that the body 2 can be inserted into the cavity more smoothly, which is more practical.

[0093] The inner diameter of the cavity is smaller than the outer diameter of the radioactive particle 20.

[0094] In practice, depending on the actual situation, a method such as placing spacers in the cavity can be used to limit the position of the radioactive particles 20 in the cavity. In this embodiment, by limiting the size of the cavity, the radioactive particles 20 can be directly fixed by the elasticity of the body 2 after they are placed in the cavity, without the need for a separate fixing mechanism to fix the position of the radioactive particles 20 in the cavity, making it more convenient to use.

[0095] The central axis of the cavity coincides with the central axis of the body 2.

[0096] In practice, depending on the actual situation, the central axis of the cavity can be set at a certain angle to the body 2, or even the cavity can be set radially on the body 2. In this embodiment, by limiting the direction of the central axis of the cavity, the diameter of the body 2 can be set to be smaller when the length of the radioactive particle 20 is greater than its diameter, which makes it easier to implant into the cavity and has strong practicality.

[0097] A rope loop 22 is fixedly connected to the end of the main body 2 away from the connecting platform 21.

[0098] With the rope loop 22 in place, when the particle implanter needs to be removed for replacement, the rope loop 22 can be directly grasped by the foreign body forceps on the endoscope, thereby dragging the particle implanter away from the human body, making it more convenient to use.

[0099] A pushing device includes a guidewire 1, a push rod 4, a cannula 3 that can be inserted into the biopsy channel of an endoscope, and a particle implanter that can pass through the guidewire as described above.

[0100] Both the main body 2 and the push rod 4 are inserted inside the sleeve 3;

[0101] One end of the main body 2 with a connecting platform 21 is located outside the sleeve 3;

[0102] One end of the push rod 4 is located inside the sleeve 3 and abuts against the end of the body 2 away from the connecting platform 21, while the free end of the push rod 4 extends out of the sleeve 3 away from the body 2.

[0103] A secondary tube 31 is fixedly provided on the outer wall of the sleeve 3, and the guide wire 1 passes through the secondary tube 31 and the through hole 210.

[0104] The main body 2 is loaded by the cannula 3 that can be inserted into the endoscope biopsy channel, and the guide wire 1 is supported by the auxiliary tube 31. Under the guidance of the guide wire 1, the particle implanter can be smoothly pushed to the corresponding cavity position by the push rod 4. The cavity support forms a fixation for the particle implanter, making it more convenient to use.

[0105] A limiting platform 41 is provided at one end of the push rod 4 near the body 2;

[0106] A pusher plate 42 is also fixedly installed on the push rod 4;

[0107] The diameters of the limiting platform 41 and the push platform 42 are both larger than the diameter of the push rod 4;

[0108] A cavity support 5 is placed between the limit table 41 and the push table 42;

[0109] The limiting platform 41, the push platform 42, and the cavity support 5 are all located inside the sleeve 3.

[0110] With the setting of limiting platform 41, push platform 42 and cavity support 5, based on the main body 2, push rod 4 and sleeve 3, the sleeve 3 can be used to place the particle implanter into the corresponding cavity position, and then the same sleeve 3 can be used to implant the cavity support 5 for fixing the particle implanter into the cavity, thereby fixing the particle implanter.

[0111] Alternatively, without placing the particle implanter, the cavity stent 5 can be placed into the cavity first using the cannula 3, and then the particle implanter can be placed using the same cannula 3, which reduces the use of consumables, saves medical costs, and is highly practical.

[0112] The sleeve 3 has a marker point 32 at one end near the body 2.

[0113] By setting the mark point 32 and using it in conjunction with X-ray fluoroscopy, the insertion position of the cannula 3 can be determined more accurately, resulting in more precise positioning and greater practicality.

[0114] A gripping sleeve 30 is fixedly provided at one end of the sleeve 3 away from the body 2, and the push rod 4 passes through the gripping sleeve 30;

[0115] A handle 40 is fixedly provided at the end of the push rod 4 away from the connecting platform 21.

[0116] The grip sleeve 30 and handle 40 make it easier to push and hold the sleeve 3 and push rod 4, making them more convenient to use.

[0117] A method of using a pushing device includes the following steps:

[0118] 1) Place the radioactive particle 20 into the cavity of the main body 2;

[0119] 2) Insert the body 2 loaded with radioactive particles 20 and the push rod 4 into the sleeve 3, so that the connecting platform 21 of the body 2 is outside the sleeve 3, and the free end of the push rod 4 extends out of the sleeve 3 away from the body 2.

[0120] 3) Insert guidewire 1 into the biopsy channel of the endoscope, so that the tip of guidewire 1 reaches the corresponding position and is placed within the field of vision of the endoscope;

[0121] 4) Pass the end of guide wire 1 through the through hole 210 and the secondary tube 31 in sequence;

[0122] 5) Simultaneously push the cannula 3 and the push rod 4 so that the body 2, cannula 3, and push rod 4 reach the corresponding positions along the guide wire 1 through the biopsy channel of the endoscope (e.g., Figure 5 (as shown)

[0123] 6) Hold the push rod 4 and pull the sleeve 3 backward relative to the push rod 4, causing the sleeve 3 to move backward relative to the push rod 4, thereby exposing the body 2 outside the sleeve 3 (e.g., Figure 6 (as shown)

[0124] 7) Then remove guidewire 1;

[0125] 8) Finally, remove the sleeve 3 and the push rod 4 together.

[0126] A method of using a pushing device includes the following steps:

[0127] 1) Install the cavity support 5 between the push table 42 and the limiting table 41;

[0128] 2) Insert guidewire 1 into the biopsy channel of the endoscope, so that the tip of guidewire 1 reaches the corresponding position and is placed within the field of view of the endoscope;

[0129] 3) Insert the end of guidewire 1 into the secondary tube 31, and then simultaneously push the cannula 3 and push rod 4, so that the cavity support 5, cannula 3 and push rod 4 pass through the biopsy channel of the endoscope and reach the corresponding position along the guidewire 1 (e.g., Figure 7 and 8 (as shown)

[0130] 4) Holding the push rod 4 and guide wire 1, continue to pull the sleeve 3 backward relative to the push rod 4, causing the sleeve 3 to move backward relative to the push rod 4, thereby exposing the cavity support 5 outside the sleeve 3. At this time, the cavity support 5 automatically expands, completing its own fixation, and pressing the guide wire 1 against the outer wall (e.g., Figure 9 (as shown)

[0131] 5) After that, with the guidewire 1 fixed, remove the cannula 3 and the push rod 4 together from the biopsy channel of the endoscope, and then remove them from the guidewire 1.

[0132] 6) Hold the push rod 4 and push the sleeve 3 forward relative to the push rod 4 to make room for the installation position of the body 2 at the front end of the sleeve 3;

[0133] 7) Place the radioactive particle 20 into the cavity of the main body 2;

[0134] 8) Place the body 2 loaded with radioactive particles 20 into the installation position at the front end of the sleeve 3, and make the connecting platform 21 of the body 2 outside the sleeve 3.

[0135] 9) Pass the end of guide wire 1 through the through hole 210 and the secondary tube 31 in sequence;

[0136] 10) Simultaneously push the cannula 3 and the push rod 4 so that the body 2, cannula 3, and push rod 4 reach the position of the cavity support 5 along the guide wire 1 through the biopsy channel of the endoscope (e.g., Figure 10 (as shown)

[0137] 11) Hold the push rod 4 and guide wire 1, and pull the sleeve 3 backward relative to the push rod 4, so that the sleeve 3 moves backward relative to the push rod 4, thereby exposing the body 2 outside the sleeve 3 and pressing it against the outer wall of the expanded cavity support 5 (e.g., Figure 11 (as shown)

[0138] 12) After that, remove the guide wire 1, and then remove the sleeve 3 and push rod 4 together.

[0139] The foregoing has provided a detailed description of a guidewire-accessible particle implanter, delivery device, and method of use provided by the present invention. The specific embodiments described are merely for the purpose of aiding understanding the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A pushing device, characterized in that: include: Ontology(2); The body (2) has a cavity inside for loading radioactive particles (20); One end of the body (2) is provided with a connecting platform (21), and the connecting platform (21) is provided with a through hole (210) for threading the guide wire (1). The through hole (210) includes a coaxial section (211), a transition section (212) and an inclined section (213) connected in sequence. The coaxial section (211) is connected to the free end of the connecting platform (21), and the central axis of the coaxial section (211) coincides with the central axis of the connecting platform (21). The inclined section (213) is inclined from the inside out toward the free end away from the connecting platform (21) and penetrates the outer wall of the connecting platform (21); It also includes a guidewire (1), a push rod (4), and a cannula (3) that can be inserted into the endoscope biopsy channel; Both the main body (2) and the push rod (4) are inserted into the sleeve (3); The main body (2) has a connecting platform (21) at one end located outside the sleeve (3); One end of the push rod (4) is located inside the sleeve (3) and abuts against the end of the body (2) away from the connecting platform (21), and the free end of the push rod (4) extends out of the sleeve (3) away from the end of the body (2); The outer wall of the sleeve (3) is fixedly provided with a secondary tube (31), and the guide wire (1) passes through the secondary tube (31) and the through hole (210); The push rod (4) has a limiting platform (41) at one end near the body (2). A pusher platform (42) is also fixedly installed on the push rod (4); The push rod (4) has a cavity support (5) placed between the limiting platform (41) and the push platform (42). The limiting platform (41), the push platform (42), and the cavity support (5) are all located inside the sleeve (3); With the setting of the limiting platform (41), the pusher (42) and the cavity stent (5), without placing the particle implanter, the cavity stent (5) is first placed into the cavity using the cannula (3), and then the particle implanter is placed in the same cannula (3).

2. The pushing device according to claim 1, characterized in that: The connecting platform (21) is cone-shaped, with a smaller front and a larger back.

3. The pushing device according to claim 1, characterized in that: The inner diameter of the cavity is smaller than the outer diameter of the radioactive particle (20).

4. The pushing device according to claim 1, characterized in that: A rope loop (22) is fixedly connected to the end of the main body (2) away from the connecting platform (21).

5. A pushing device according to claim 1, characterized in that: The diameter of the limiting platform (41) and the push platform (42) is larger than the diameter of the push rod (4).

6. A pushing device according to claim 1, characterized in that: The sleeve (3) has a marking point (32) at one end near the body (2).

7. A pushing device according to claim 1, characterized in that: The sleeve (3) is fixedly provided with a grip sleeve (30) at one end away from the body (2), and the push rod (4) passes through the grip sleeve (30); The push rod (4) has a handle (40) fixed at the end away from the connecting table (21).

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