Solid medicine grinding device for intratumoral perfusion chemotherapy

By designing a solid drug grinding device for oncology infusion chemotherapy with a rotating plate, a fixed frame and an air pump, flexible adjustment of the drug grinding effect and efficient cleaning are achieved, solving the problem of fixed grinding effect of existing devices and improving work efficiency and drug utilization.

CN117483037BActive Publication Date: 2025-10-14FOURTH MILITARY MEDICAL UNIVERSITY
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Patent Information

Application Number
CN202311441743.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-01
Publication Date
2025-10-14
Estimated Expiration
2043-11-01

AI Technical Summary

Technical Problem

Existing solid drug grinding devices cannot adjust the gap between the grinding discs, resulting in a fixed grinding effect and being unable to adapt to the grinding requirements of different drugs.

Method used

A device including a rotating plate, a fixed frame, a grinding mechanism and an air pump was designed. The rotation of the grinding mechanism and the adjustment of the grinding gap were controlled by a motor and an adjustment component. Hollow spheres and multiple grinding bodies were used to achieve step-by-step grinding of the medicine, and the air pump was used to clean the medicine adhering to the inner wall.

Benefits of technology

It realizes flexible adjustment of the drug grinding effect, improves work efficiency, prevents drug particles from escaping, ensures that the drug is completely ground and easy to take out, cleans the drug adhering to the inner wall, and improves the use efficiency of the device.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to the technical fields of medicine grinding equipment, in particular to a solid medicine grinding device for perfusion chemotherapy in medical oncology, which comprises a base, a box arranged on the upper surface of the base and a control box, wherein the front surface of the box is provided with a mounting groove, the first adjusting assembly is arranged in the mounting groove, the first adjusting assembly comprises a first motor arranged at the bottom of the mounting groove and a rotating plate, the output shaft end of the first motor is connected to the center of the back side of the rotating plate, and the rotating plate is connected to the mounting groove through a first connecting structure; the front surface of the rotating plate is provided with a first fixing frame and a second fixing frame, and the outer surface center of the first fixing frame is provided with a second motor. The first motor is controlled by the control box to drive the rotating plate to rotate, so that the grinding mechanism rotates synchronously, and the smoke is in different grinding gaps under the action of gravity, thereby realizing rapid adjustment of the grinding effect.
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Description

Technical Field

[0001] The present invention relates to the technical field related to medicine grinding equipment, in particular to a solid medicine grinding device for oncology perfusion chemotherapy. Background Art

[0002] Tumors are neoplasms formed by the proliferation of localized tissue cells under the influence of various tumorigenic factors. Because these neoplasms often appear as space-occupying, block-like protrusions, chemotherapy is often used to treat tumors. Chemotherapy is the abbreviation for chemical drug therapy, which uses chemotherapeutic drugs to kill cancer cells to achieve the purpose of treatment. During chemotherapy, when using solid drugs, a grinding mechanism is generally required to grind the solid drugs.

[0003] The existing solid drug grinding device has the following shortcomings: the grinding mechanism is generally composed of two grinding discs. By driving one of the grinding discs, the two grinding discs rotate relative to each other, thereby grinding the drug between the two grinding discs. However, since the gap between the grinding discs is fixed, the grinding effect of the drug cannot be adjusted. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides a solid medicine grinding device for oncology perfusion chemotherapy.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a solid medicine grinding device for oncology internal medicine perfusion chemotherapy, including a base, a box body and a control box arranged on the upper surface of the base, wherein:

[0006] The front of the box body is provided with a mounting slot, and the box body is provided with a first adjustment assembly inside the mounting slot, the first adjustment assembly comprising a first motor mounted at the bottom of the mounting slot and a rotating plate, the back center of the rotating plate is connected to the output shaft end of the first motor, and the rotating plate is connected to the mounting slot via a first connecting structure;

[0007] A first fixing frame and a second fixing frame are provided on the front of the rotating plate, a second motor is installed at the center of the outer surface of the first fixing frame, and a grinding mechanism is provided on the inner sides of the first fixing frame and the second fixing frame through a second adjustment assembly;

[0008] The grinding mechanism includes a housing connected to the second adjustment assembly and a hollow sphere disposed inside the housing, the housing being composed of a first shell and a second shell, the first shell and the second shell being connected to the second adjustment assembly via a first lifting frame and a second lifting frame, respectively. A rotating shaft is disposed at the upper end of the hollow sphere, the upper end of the rotating shaft passing through a shaft sleeve at the center of the first shell and being connected to the output shaft of the second motor;

[0009] The outer side of the hollow sphere is provided with a first grinding body, a second grinding body and a third grinding body;

[0010] The control box is arranged on one side of the box body, and the control box is connected to the first motor and the second motor through wires.

[0011] Preferably, the first connection structure includes a slide rail and four pulleys arranged at the end of the installation groove. The four pulleys are respectively arranged at the four corners of the rotating plate through brackets, and the pulleys are rollingly connected to the slide rail.

[0012] Preferably, the second adjustment assembly includes a third motor, a guide rod, and a double-ended screw rod arranged on the upper surface of the first fixed frame. The guide rod and the double-ended screw rod are both arranged on the inner sides of the first fixed frame and the second fixed frame and are arranged parallel to each other. One end of the double-ended screw rod is connected to the output shaft of the third motor.

[0013] Preferably, the guide rod is slidably connected to the first lifting frame and the second lifting frame, and the double-headed screw rod is connected to the first lifting frame and the second lifting frame through threads.

[0014] Preferably, the first shell is arranged at the center hole of the first lifting frame, and the first shell is fixedly connected to the first lifting frame.

[0015] Preferably, the second shell is arranged at the center hole of the second lifting frame, and the second shell is connected to the second lifting frame via a second connecting structure.

[0016] Preferably, the second connecting structure includes a step groove opened on the outside of the center hole of the second lifting frame and a ring plate arranged on the outside of the second shell port. The second lifting frame is evenly provided with a plurality of positioning rods at the bottom of the step groove. The ring plate is located in the step groove, and the ring plate is evenly provided with a plurality of positioning holes, and the positioning holes correspond one-to-one to the positioning rods.

[0017] Preferably, the outer surfaces of the first grinding body, the second grinding body and the third grinding body form a first grinding gap, a second grinding gap and a third grinding gap with the inner wall of the shell respectively, and the thicknesses of the first grinding gap, the second grinding gap and the third grinding gap gradually decrease.

[0018] Preferably, it also includes an air pump, an air cover and several elastic air bags arranged on the upper surface of the first fixed frame, the air outlet end of the air pump is provided with an air pipe, the air cover is sleeved on the outer side of the upper end of the rotating shaft, the air cover is connected to the air pipe, and is connected to the hollow sphere and the center hole of the rotating shaft, and several elastic air bags are evenly distributed in the mounting holes on the surface of the third grinding body, and are connected to the interior of the hollow sphere.

[0019] Preferably, the lower surface of the first lifting frame is embedded with a sealing ring outside the first shell, and the sealing ring abuts against the upper surface of the second lifting frame.

[0020] Advantages of the present application:

[0021] 1. By arranging the mounting groove on the front surface of the box body, arranging the rotating plate in the mounting groove through the first adjusting assembly, and arranging the first grinding body, the second grinding body and the third grinding body on the surface of the hollow sphere of the grinding mechanism, the first grinding body, the second grinding body and the third grinding body form the first grinding gap, the second grinding gap and the third grinding gap with the inner wall of the shell respectively, and in use, the rotating plate is rotated by controlling the first motor, so that the grinding mechanism rotates synchronously, and the smoke is in different grinding gaps under the action of gravity, thereby realizing rapid adjustment of the grinding effect.

[0022] 2. The grinding mechanism is connected with the first fixing frame and the second fixing frame on the surface of the rotating plate through the second adjusting assembly, and the second shell of the grinding mechanism is connected with the second lifting frame through the second connecting structure, so that in use, the first shell and the second shell are quickly combined into the shell by controlling the third motor to drive the double-head screw rod to rotate, and after grinding is completed, the medicine is in the second shell, which facilitates rapid removal of the medicine and improves the work efficiency.

[0023] 3. The grinding mechanism is composed of the shell and the hollow sphere, and the shell is composed of the first shell and the second shell, so that in use, the first shell and the second shell form a closed shell, and the first grinding body, the second grinding body and the third grinding body are rotated by the hollow sphere inside to realize grinding of the medicine, and in the whole process, the medicine particles generated by grinding can be effectively prevented from escaping.

[0024] 4. By arranging the air pump, opening the air duct at the center of the rotating shaft, arranging the elastic air bag on the surface of the third grinding body by opening the mounting hole, and connecting the elastic air bag with the inside of the hollow sphere, after grinding is completed, the air pump works, the generated airflow reaches the elastic air bag through the air conveying pipe, the air duct and the hollow sphere, and the elastic air bag is inflated, and the second motor works, so that the elastic air bag and the hollow sphere rotate synchronously, thereby rapidly cleaning the inner wall of the first shell, effectively preventing the medicine from adhering to the inner wall of the first shell and affecting subsequent grinding of the medicine. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below in conjunction with the drawings and examples.

[0026] Figure 1 It is a whole structure schematic view of the solid medicine grinding device for perfusion chemotherapy in the oncology department of the present application.

[0027] Figure 2 This is a schematic diagram of the installation of a rotating plate of a solid medicine grinding device for oncology perfusion chemotherapy according to the present invention;

[0028] Figure 3 This is a schematic structural diagram of a second regulating assembly of a solid medicine grinding device for oncology perfusion chemotherapy according to the present invention;

[0029] Figure 4 This is a schematic structural diagram of a grinding mechanism of a solid medicine grinding device for oncology intravenous chemotherapy according to the present invention;

[0030] Figure 5 This is a top view of the second shell of a solid medicine grinding device for oncology perfusion chemotherapy according to the present invention;

[0031] Figure 6 A top view of the second lifting frame of a solid medicine grinding device for oncology perfusion chemotherapy according to the present invention;

[0032] Figure 7 A bottom view of a first lifting frame of a solid medicine grinding device for oncology intravenous chemotherapy according to the present invention;

[0033] Figure 8 This is a schematic diagram of the installation of an elastic air bag of a solid medicine grinding device for oncology chemotherapy perfusion according to the present invention;

[0034] Figure 9 The present invention is a schematic diagram of the connection between the rotating shaft and the gas hood of a solid medicine grinding device for oncology perfusion chemotherapy.

[0035] In the figure: 1. base; 2. box body; 3. control box; 4. mounting slot; 5. first motor; 6. rotating plate; 7. first fixing frame; 8. second fixing frame; 9. second motor; 10. outer shell; 11. first shell; 12. second shell; 13. first lifting frame; 14. second lifting frame; 15. hollow sphere; 16. rotating shaft; 17. bushing; 18. first grinding body; 19. second grinding body; 20. third grinding body; 21. slide rail; 22. pulley; 23. third motor; 24. guide rod; 25. double-ended screw; 26. step groove; 27. ring plate; 28. positioning rod; 29. ​​positioning hole; 30. first grinding gap; 31. second grinding gap; 32. third grinding gap; 33. sealing ring; 34. air pump; 35. air cover; 36. elastic airbag; 37. air supply pipe. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0037] like Figures 1-9As shown, the present invention provides a solid drug grinding device for oncology perfusion chemotherapy, comprising a base 1, a box 2 and a control box 3 arranged on the upper surface of the base 1, wherein:

[0038] The front of the box body 2 is provided with a mounting slot 4, and the box body 2 is provided with a first adjustment assembly inside the mounting slot 4. The first adjustment assembly includes a first motor 5 and a rotating plate 6 installed at the bottom of the mounting slot 4. The center of the back side of the rotating plate 6 is connected to the output shaft end of the first motor 5. The rotating plate 6 is connected to the mounting slot 4 through a first connecting structure.

[0039] A first fixing frame 7 and a second fixing frame 8 are provided on the front of the rotating plate 6. A second motor 9 is installed at the center of the outer surface of the first fixing frame 7. A grinding mechanism is provided on the inner sides of the first fixing frame 7 and the second fixing frame 8 through a second adjustment assembly.

[0040] The grinding mechanism includes a housing 10 connected to the second adjustment assembly and a hollow sphere 15 disposed inside the housing 10. The housing 10 is composed of a first shell 11 and a second shell 12. The first shell 11 and the second shell 12 are connected to the second adjustment assembly via a first lifting frame 13 and a second lifting frame 14, respectively. A rotating shaft 16 is provided at the upper end of the hollow sphere 15. The upper end of the rotating shaft 16 passes through a shaft sleeve 17 at the center of the first shell 11 and is connected to the output shaft of the second motor 9.

[0041] A first grinding body 18, a second grinding body 19 and a third grinding body 20 are provided on the outside of the hollow sphere 15, wherein the first grinding body 18 and the third grinding body 20 are arranged opposite to each other, respectively, at the two ends of the hollow sphere 15, and the second grinding body 19 is arranged on the outside of the middle part of the hollow sphere 15;

[0042] The control box 3 is disposed on one side of the box body 2 , and the control box 3 is connected to the first motor 5 and the second motor 9 through wires.

[0043] The first connection structure includes a slide rail 21 and four pulleys 22 arranged at the end of the installation groove 4. The four pulleys 22 are respectively arranged at the four corners of the rotating plate 6 through brackets, and the pulleys 22 are rollingly connected to the slide rail 21.

[0044] The second adjustment assembly includes a third motor 23, a guide rod 24, and a double-ended screw rod 25 arranged on the upper surface of the first fixed frame 7. The guide rod 24 and the double-ended screw rod 25 are both arranged on the inner sides of the first fixed frame 7 and the second fixed frame 8, and are arranged parallel to each other. One end of the double-ended screw rod 25 is connected to the output shaft of the third motor 23; the guide rod 24 is slidably connected to the first lifting frame 13 and the second lifting frame 14, and the double-ended screw rod 25 is connected to the first lifting frame 13 and the second lifting frame 14 by threads.

[0045] The first shell 11 is arranged at the center hole of the first lifting frame 13 and is fixedly connected to the first lifting frame 13; the second shell 12 is arranged at the center hole of the second lifting frame 14 and is connected to the second lifting frame 14 through a second connecting structure.

[0046] The second connection structure includes a step groove 26 provided on the outside of the center hole of the second lifting frame 14 and a ring plate 27 provided on the outside of the port of the second shell 12. The second lifting frame 14 is evenly provided with a plurality of positioning rods 28 at the bottom of the step groove 26. The ring plate 27 is located in the step groove 26, and the ring plate 27 is evenly provided with a plurality of positioning holes 29. The positioning holes 29 correspond to the positioning rods 28 one-to-one, which facilitates the rapid removal of the ground medicine through the second shell 12 and ensures the stability of the first shell 11 and the second shell 12 during the grinding process.

[0047] The outer surfaces of the first grinding body 18, the second grinding body 19, and the third grinding body 20 form a first grinding gap 30, a second grinding gap 31, and a third grinding gap 32 with the inner wall of the housing 10, respectively. The thicknesses of the first grinding gap 30, the second grinding gap 31, and the third grinding gap 32 gradually decrease. By placing the medicine in different grinding gaps, the diameter of the ground medicine can be adjusted.

[0048] The first fixing frame also includes an air pump 34, an air cover 35 and a plurality of elastic air bags 36 arranged on the upper surface of the first fixing frame. The air outlet end of the air pump 34 is provided with an air pipe 37. The air cover 35 is sleeved on the outer side of the upper end of the rotating shaft 16. The air cover 35 is connected to the air pipe 37 and is connected to the central hole of the hollow sphere 15 and the rotating shaft 16. The plurality of elastic air bags 36 are evenly distributed in the mounting holes on the surface of the third grinding body 20 and are connected to the interior of the hollow sphere 15.

[0049] In this embodiment, an angle sensor is provided on the outside of the output shaft of the first motor 5. The output end of the angle sensor is electrically connected to the input end of the control box 3. The rotation angle of the rotating plate 6 is monitored in real time through the angle sensor, and the relative angle between the rotating plate 6 and the box body 2 is adjusted in combination with the first motor 5.

[0050] A sealing ring 33 is embedded in the lower surface of the first lifting frame 13 outside the first shell 11. The sealing ring 33 abuts against the upper surface of the second lifting frame 14 to enhance the sealing after the first shell 11 and the second shell 12 are connected, thereby preventing the escape of drug particles during the grinding process.

[0051] Working principle: Putting the medicine in: The third motor 23 is controlled by the control box 3 to work, and then under the joint action of the double-headed screw 25 and the guide rod 24, the first lifting frame 13 and the second lifting frame 14 move away from each other, and the medicine to be ground is placed in the second shell 12. Subsequently, the third motor 23 is controlled to drive the double-headed screw 25 to rotate in the opposite direction until the lower end of the first shell 11 contacts the upper end of the second shell 12 and forms the outer shell 10. At this time, the hollow sphere 15 is on the inner side of the outer shell 10.

[0052] Drug grinding: The second motor 9 is controlled by the control box 3. Under the action of the rotating shaft 16, the hollow sphere 15 drives the first grinding body 18, the second grinding body 19, and the third grinding body 20 on the outer wall to rotate synchronously, and grinds the drugs in the first grinding gap 30, the second grinding gap 31, and the third grinding gap 32.

[0053] Inner wall cleaning: Start the air pump 34. The airflow generated by the air pump 34 causes the elastic airbag 36 to expand. The second motor 9 drives the hollow sphere 15 to rotate through the rotating shaft 16. At the same time, the elastic airbag 36 rotates synchronously and rubs against the inner wall of the first shell 11, thereby quickly cleaning the medicine adhered to the inner wall of the first shell 11.

[0054] Taking out the medicine: After the grinding is completed, the third motor 23 is controlled to rotate in the opposite direction so that the first shell 11 and the second shell 12 constituting the housing 10 are separated again. At this time, the second shell 12 containing the medicine is directly taken out from the second lifting frame 14.

[0055] In the above-mentioned drug grinding stage, the first motor 5 is controlled by the control box 3 to work, thereby driving the rotating plate 6 and the grinding mechanism arranged on the front of the rotating plate 6 to rotate synchronously, that is, when the rotating plate 6 rotates 90°, the outer shell 10 and the hollow sphere 15 of the grinding mechanism are both rotated 90°, and the drug enters the second grinding gap 31 from the first grinding gap 30; when the rotating plate 6 rotates 90° again, the drug enters the third grinding gap 32 from the second grinding gap 31, and then the grinding effect is adjusted by placing the drug in different grinding gaps.

[0056] Wherein, when the rotating plate 6 rotates, the rotating angle is monitored in real time by the angle sensor, the monitored data is received by the control box 3, the first motor 5 is precisely controlled, and after the medicine is put in and the grinding is completed, the second shell 12 is ensured to be opened upward.

[0057] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A solid medicine grinding device for oncology perfusion chemotherapy, characterized in that: It comprises a base (1), a box (2) and a control box (3) arranged on the upper surface of the base (1), wherein: The front of the box (2) is provided with a mounting groove (4), and the box (2) is provided with a first adjustment component inside the mounting groove (4), the first adjustment component comprising a first motor (5) mounted at the bottom of the mounting groove (4) and a rotating plate (6), the back center of the rotating plate (6) being connected to the output shaft end of the first motor (5), and the rotating plate (6) being connected to the mounting groove (4) via a first connecting structure; A first fixing frame (7) and a second fixing frame (8) are provided on the front of the rotating plate (6); a second motor (9) is installed at the center of the outer surface of the first fixing frame (7); and a grinding mechanism is provided on the inner sides of the first fixing frame (7) and the second fixing frame (8) via a second adjustment assembly; The grinding mechanism comprises a housing (10) connected to the second adjustment assembly and a hollow sphere (15) arranged inside the housing (10), wherein the housing (10) is composed of a first shell (11) and a second shell (12), wherein the first shell (11) and the second shell (12) are connected to the second adjustment assembly via a first lifting frame (13) and a second lifting frame (14), respectively; a rotating shaft (16) is provided at the upper end of the hollow sphere (15), wherein the upper end of the rotating shaft (16) passes through a shaft sleeve (17) at the center of the first shell (11) and is connected to the output shaft of the second motor (9); A first grinding body (18), a second grinding body (19), and a third grinding body (20) are arranged on the outside of the hollow sphere (15); the first grinding body (18) and the third grinding body (20) are arranged opposite to each other and are respectively arranged at two ends of the hollow sphere (15); the second grinding body (19) is arranged on the outside of the middle part of the hollow sphere (15); The control box (3) is arranged on one side of the box body (2), and the control box (3) is connected to the first motor (5) and the second motor (9) via wires; The outer surfaces of the first grinding body (18), the second grinding body (19), and the third grinding body (20) and the inner wall of the shell (10) respectively form a first grinding gap (30), a second grinding gap (31), and a third grinding gap (32), and the thickness of the first grinding gap (30), the second grinding gap (31), and the third grinding gap (32) gradually decreases. By placing the medicine in different grinding gaps, the diameter of the medicine after grinding is adjusted.

2. The solid medicine grinding device for oncology intravenous chemotherapy according to claim 1, characterized in that: The first connection structure comprises a slide rail (21) and four pulleys (22) arranged at the end of the mounting groove (4); the four pulleys (22) are respectively arranged at the four corners of the rotating plate (6) through brackets, and the pulleys (22) are rollingly connected to the slide rail (21).

3. The solid medicine grinding device for oncology intravenous chemotherapy according to claim 1, characterized in that: The second adjustment assembly includes a third motor (23) arranged on the upper surface of the first fixed frame (7), a guide rod (24), and a double-headed screw rod (25). The guide rod (24) and the double-headed screw rod (25) are both arranged on the inner side of the first fixed frame (7) and the second fixed frame (8) and are arranged parallel to each other. One end of the double-headed screw rod (25) is connected to the output shaft of the third motor (23).

4. The solid medicine grinding device for oncology intravenous chemotherapy according to claim 3, characterized in that: The guide rod (24) is slidably connected to the first lifting frame (13) and the second lifting frame (14), and the double-headed screw rod (25) is connected to the first lifting frame (13) and the second lifting frame (14) via threads.

5. The solid medicine grinding device for oncology intravenous chemotherapy according to claim 1, characterized in that: The first shell (11) is arranged at the center hole of the first lifting frame (13), and the first shell (11) is fixedly connected to the first lifting frame (13).

6. The solid medicine grinding device for oncology intravenous chemotherapy according to claim 1, characterized in that: The second shell (12) is arranged at the center hole of the second lifting frame (14), and the second shell (12) and the second lifting frame (14) are connected via a second connecting structure.

7. The solid medicine grinding device for oncology intravenous chemotherapy according to claim 6, characterized in that: The second connection structure includes a step groove (26) provided on the outside of the center hole of the second lifting frame (14), and a ring plate (27) provided on the outside of the port of the second shell (12). The second lifting frame (14) is provided with a plurality of positioning rods (28) evenly distributed at the bottom of the step groove (26). The ring plate (27) is located in the step groove (26), and the ring plate (27) is provided with a plurality of positioning holes (29) evenly distributed, and the positioning holes (29) correspond one-to-one to the positioning rods (28).

8. The solid medicine grinding device for oncology intravenous chemotherapy according to claim 1, characterized in that: The invention also includes an air pump (34), an air cover (35) and a plurality of elastic air bags (36) arranged on the upper surface of the first fixing frame. The air outlet end of the air pump (34) is provided with an air supply pipe (37). The air cover (35) is sleeved on the outer side of the upper end of the rotating shaft (16). The air cover (35) is communicated with the air supply pipe (37) and is communicated with the central hole of the hollow sphere (15) and the rotating shaft (16). The plurality of elastic air bags (36) are evenly distributed in the mounting holes on the surface of the third grinding body (20) and are communicated with the interior of the hollow sphere (15).

9. The solid medicine grinding device for oncology intravenous chemotherapy according to claim 1, characterized in that: A sealing ring (33) is embedded in the lower surface of the first lifting frame (13) on the outside of the first shell (11), and the sealing ring (33) abuts against the upper surface of the second lifting frame (14).

Citation Information

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