Anti-splashing chemotherapy medicine dispensing device for nursing in blood oncology department

Abstract

The invention discloses an anti-splashing chemotherapeutic drug dispensing device for nursing in the blood oncology department, and belongs to the technical field of medical instruments, the anti-splashing chemotherapeutic drug dispensing device comprises a base, a first connecting shaft is rotatably connected to the top surface of the base, a first connecting plate is slidably connected to the first connecting shaft, and a drug suction mechanism is arranged at the bottom, away from the first connecting shaft, of the first connecting plate; a plurality of connecting seats are fixedly connected to the top face of the base in the circumferential direction at equal intervals, first grooves are formed in the connecting seats, limiting mechanisms for fixing ampoule bottles are arranged in the first grooves, the medicine suction mechanisms are located above the first grooves adjacent to the medicine suction mechanisms, crushing mechanisms are arranged on first connecting shafts, and the crushing mechanisms are located above the connecting seats. And a negative pressure mechanism is arranged on the top surface of the first connecting plate. The base drives the first connecting plate to rotate through the first connecting shaft, and the medicine suction mechanism is driven by the negative pressure mechanism to perform suction operation on ampoule bottles. Through integrated design, the medicine extracting, crushing and anti-splashing functions are achieved, and the medicine dispensing efficiency and safety are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a splash-proof chemotherapy drug dispenser for nursing in hematology and oncology departments. Background Art

[0002] Chemotherapy drugs are typically made up of multiple medications, and the type and dosage of each drug varies depending on the condition. This means that medication can only be dispensed when needed. Currently, most medications are dispensed in intravenous preparation centers, but in more primary hospitals, this can only be done within biosafety cabinets. This leads to a high risk of contact. For example, when opening an ampoule, the drug solution and glass fragments fly, which can cause direct contact with gloves and scratches. Furthermore, existing clamps are mostly fixed in size and cannot accommodate the needs of fixing ampoules of different sizes. Summary of the Invention

[0003] The purpose of the present invention is to provide a splash-proof chemotherapy drug dispenser for use in hematology and oncology nursing, so as to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides a splash-proof chemotherapy drug dispenser for hematology and oncology nursing, comprising a base, the top surface of the base is rotatably connected to a first connecting shaft, the first connecting shaft is slidably connected to a first connecting plate, the first connecting plate is provided with a drug suction mechanism at the bottom away from the first connecting shaft, a plurality of connecting seats are fixedly connected to the top surface of the base at equal intervals in the circumferential direction, a first groove is provided in the connecting seat, a limiting mechanism for fixing an ampoule bottle is provided in the first groove, the drug suction mechanism is located above the first groove adjacent to it, a crushing mechanism is provided on the first connecting shaft, the crushing mechanism is located above the connecting seat, and a negative pressure mechanism is provided on the top surface of the first connecting plate.

[0005] Preferably, the drug suction mechanism includes a second connecting plate fixedly connected to the bottom surface of the first connecting plate, a first slide groove is provided at the bottom of the second connecting plate, a first slider is symmetrically slidably connected in the first slide groove, a clamping block is fixed to the end of the first slider away from the first connecting shaft, and the end of the clamping block close to the first slide groove is slidably connected in the first slide groove, a first driving part is provided at the end of the first slider away from the clamping block, and the first driving part is fixed to the second connecting plate.

[0006] Preferably, the first driving part includes a first motor fixedly connected to the second connecting plate, and the output shaft of the first motor is fixedly connected to a forward and reverse screw, and the forward and reverse screws are respectively threadedly connected to the two first sliding blocks.

[0007] Preferably, a second slide groove is provided on the side of the first connecting shaft close to the first connecting plate, the first connecting plate is slidably connected in the second slide groove, the top surface of the first connecting shaft is fixedly connected to the second motor, the output shaft of the second motor is fixedly connected to the first screw, the bottom of the first screw rotates with the bottom of the second slide groove, and the first connecting plate is threadedly connected to the first screw.

[0008] Preferably, the limiting mechanism includes a flexible airbag arranged on the inner wall of the first groove, a first cavity is provided in the connecting seat, an air inlet and an exhaust port are respectively provided in the flexible airbag, a first valve is provided in the air inlet, a second valve is provided in the exhaust port, the exhaust port is connected to the first cavity, a micro air pump is provided in the first cavity, the micro air pump is connected to a first connecting pipe, the first connecting pipe is located in the first cavity, and the first connecting pipe is connected to the air inlet.

[0009] Preferably, the crushing mechanism includes a crushing ring rotatably connected to the first connecting shaft, a crushing rod is fixed inside the crushing ring, a first through hole is provided on the crushing ring, the crushing rod passes through the first through hole, a screw is passed through the crushing ring, and the screw abuts against the outer wall of the first connecting shaft.

[0010] Preferably, a third sliding groove is provided on the outer wall of the first connecting shaft, and the breaking rod is slidably connected in the third sliding groove.

[0011] Preferably, a second cavity is provided in the base, a third motor is provided in the second cavity, the output shaft of the third motor is fixedly connected to a first bevel gear, the bottom surface of the first connecting shaft extends into the second cavity and is fixedly connected to a second bevel gear, and the first bevel gear is meshed with the second bevel gear.

[0012] Preferably, the negative pressure mechanism includes a negative pressure box fixed to the top surface of the first connecting plate.

[0013] Preferably, the block is in the shape of an arc.

[0014] The present invention discloses the following technical effects: The base rotates the first connecting plate via a first connecting shaft, and the drug suction mechanism, driven by a negative pressure mechanism, aspirates the ampoule. The crushing mechanism rotates along with the first connecting shaft to crush the ampoule. A limit mechanism within the connecting base secures the position of the ampoule. This invention achieves drug extraction, crushing, and splash prevention functions through an integrated design, improving both dispensing efficiency and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0016] Figure 1 This is a schematic structural diagram of a splash-proof chemotherapy drug dispenser for hematology and oncology nursing of the present invention;

[0017] Figure 2 This is a schematic structural diagram of the third chute of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure inside the base of the present invention;

[0019] Figure 4 It is a structural schematic diagram of the limiting mechanism of the present invention.

[0020] In the figure: 1. base; 2. first connecting shaft; 3. first connecting plate; 4. connecting seat; 5. first groove; 6. second connecting plate; 7. first slide; 8. first slider; 9. block; 10. first motor; 11. forward and reverse screw; 12. second slide; 13. second motor; 14. first screw; 15. flexible airbag; 16. first cavity; 17. air inlet; 18. exhaust; 19. first valve; 20. second valve; 21. micro air pump; 22. first connecting pipe; 23. crushing ring; 24. crushing rod; 25. first through hole; 26. screw; 27. third slide; 28. second cavity; 29. ​​third motor; 30. first bevel gear; 31. second bevel gear; 32. negative pressure box. DETAILED DESCRIPTION

[0021] In the field of oncology treatment, occupational exposure during the preparation of chemotherapy drugs has long plagued medical staff. Traditional manual dispensing methods pose risks of drug splashing and aerosol dispersion, posing not only health risks to operators but also potentially causing environmental pollution. With the advancement of medical technology, splash-proof chemotherapy drug dispensers have become a core focus of oncology nursing equipment upgrades.

[0022] The evolution of pharmaceutical dispensing technology is essentially an equipment innovation driven by occupational health protection needs. Early dispensing relied on manual labor, requiring medical staff to directly contact the vials for steps such as opening, aspiration, and dilution. This model has three inherent flaws: First, glass shards and drug powder splashing are common when opening ampoules. Literature records indicate that the incidence of drug powder spillage during traditional manual ampoule opening is as high as 37%; second, during syringe aspiration, improper control of the solvent injection speed can easily cause drug liquid to splash; and third, during the exhaust operation, the drug liquid is directly discharged into the air, leading to aerosol contamination.

[0023] To address these issues, biosafety cabinets have been introduced as a primary means of protection. They utilize laminar flow technology to maintain a negative pressure environment in the operating area, and combined with HEPA filters, they can intercept 99.99% of particles as small as 0.3μm. However, clinical practice has revealed limitations in the use of biosafety cabinets: limited operating space makes handling large infusion bags difficult; airflow imbalance is disrupted when the cabinet door is opened more than 20cm; and the height limit of the protective glass requires medical staff to lean forward, which can easily lead to occupational musculoskeletal injuries during prolonged operation.

[0024] As robotic technology penetrates the medical field, dispensing robots are beginning to take on high-risk operations. These devices use robotic arms to automate processes such as vial grasping, needle puncture, and liquid aspiration. Combined with visual recognition systems, they can achieve 0.1ml precision in dispensing. Notably, one model of these dispensing robots utilizes spinner technology, rotating the syringe at 60 rpm. Combined with a pressure sensor to monitor aspiration resistance in real time, this reduces powder dissolution time to one-third that of traditional methods.

[0025] The particularity of oncology nursing scenarios dictates that splash-proof dispensers must meet multi-dimensional technical requirements. In an intravenous medication dispensing center, the average daily volume of chemotherapy drug prescriptions can reach 200 groups, requiring the equipment to have continuous operation capabilities. Actual measurement data from a hospital showed that after adopting a dual-robotic arm dispensing system, the efficiency of single-shift dispensing increased by 4 times, and the dosage error rate due to human factors decreased from 0.32% to 0.05%.

[0026] Portable medication dispensing devices are becoming a new demand in community hospitals and oncology clinics. One company has developed a mobile medication dispensing cart that integrates a miniature negative pressure chamber and a foldable operating table. When unfolded, it creates an ISO 5 cleanroom environment. Its lithium battery provides eight hours of continuous operation. This design frees chemotherapy drug dispensing from the constraints of a fixed location, making it particularly suitable for use in day-case chemotherapy wards.

[0027] The preparation of specialized drugs places higher demands on technical adaptability. For example, the preparation of paclitaxel liposomes requires a 72-hour constant temperature oscillation process. A certain intelligent dissolver utilizes PID temperature control technology, coupled with an eccentric oscillation mechanism, to achieve precise temperature control at 37°C ± 0.5°C. The oscillation frequency can be adjusted between 50 and 150 rpm, ensuring uniform dispersion of liposome particles.

[0028] Despite significant advances in existing technologies, clinical applications still face numerous challenges. Most devices utilize passive containment systems. For example, the negative pressure gradient in a certain brand's dispensing chamber can only maintain a 15Pa pressure differential. When the chamber door is opened, external air can backflow, posing a risk of contamination. Active airtight isolation technology is emerging as a breakthrough. A patented design utilizes a double-door interlocking structure, coupled with a pressure-balancing valve, to maintain a negative pressure environment within the chamber even when the chamber door is opened.

[0029] There's significant room for technological advancement in anti-splash actuators. Traditional syringe adapters are often spring-driven, but a hospital test revealed that injection force fluctuations ranged as high as ±15N, easily causing drug splashes. A new electric gripper system, controlled by a servo motor, achieves 0.1N force control. Combined with a screw drive mechanism, this reduces injection speed fluctuations to ±0.2mm / s.

[0030] In terms of intelligence, the human-machine interaction of existing devices is still crude. A survey shows that nurses need to complete an average of 17 steps to operate a medicine-dispensing robot, including steps that require high cognitive load, such as barcode scanning and parameter setting. Improvements based on natural interaction technology are emerging, such as gesture recognition systems that can recognize 12 operating commands and voice control modules that support dialect recognition, significantly lowering the barrier to entry.

[0031] The future development of splash-proof chemotherapy dispensers will demonstrate the convergence of three key technological trends. The first is breakthroughs in materials science, such as the use of shape-memory alloys in the needle mechanism. This allows the needle to automatically retract into a protective sheath when not in use and automatically expand upon insertion into a vial. Laboratory tests have shown that this design can reduce accidental stick injuries by 92%.

[0032] Secondly, microfluidics is gaining ground. By integrating a microchannel network into dispensing needles, precise control of drug flow rates is achieved. A research team developed a laminar flow control needle with an internal spiral flow channel, allowing the drug to be injected into the vial in a laminar flow state. Combined with a pressure monitoring module, it can control solvent injection rate fluctuations to within ±2%.

[0033] Finally, there is the deep integration of IoT technology. A chemotherapy drug preparation traceability system built by a certain company can automatically collect data such as drug bottle information, operator identity, preparation time, etc. by integrating RFID readers on the device side to form a complete electronic batch record.

[0034] The evolution of chemotherapy drug dispensing technology, from manual operation to intelligent equipment, is essentially the technological materialization of medical safety concepts. Current splash-proof dispensers have become comprehensive solutions, centered around containment protection and integrating automation, intelligence, and the Internet of Things. However, faced with the continuous emergence of new chemotherapy drugs and the continued diversification of clinical scenarios, technological innovation still requires breakthroughs in materials science, precision manufacturing, and artificial intelligence. The ideal future device should incorporate advanced features such as adaptive bottle recognition, intelligent splash prediction, and autonomous contamination control, truly achieving the goal of "zero-exposure" dispensing and providing a solid barrier of occupational protection for oncology professionals.

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Reference Figures 1-4 As shown, this embodiment provides a splash-proof chemotherapy drug dispenser for hematology and oncology nursing, including a base 1, the top surface of the base 1 is rotatably connected to a first connecting shaft 2, the first connecting plate 3 is slidably connected to the first connecting shaft 2, and the first connecting plate 3 is provided with a drug suction mechanism at the bottom away from the first connecting shaft 2, and a plurality of connecting seats 4 are fixedly connected to the top surface of the base 1 at equal intervals in the circumferential direction, a first groove 5 is provided in the connecting seat 4, and a limiting mechanism for fixing the ampoule bottle is provided in the first groove 5, the drug suction mechanism is located above the first groove 5 adjacent to it, a crushing mechanism is provided on the first connecting shaft 2, and the crushing mechanism is located above the connecting seat 4, and a negative pressure mechanism is provided on the top surface of the first connecting plate 3.

[0038] The base 1 rotates the first connecting plate 3 via the first connecting shaft 2. Driven by the negative pressure mechanism, the drug aspiration mechanism draws the ampoule from the bottle. The crushing mechanism rotates along with the first connecting shaft 2, crushing the ampoule. A limiter mechanism within the connecting base 4 secures the ampoule in place. This integrated design achieves drug extraction, crushing, and splash prevention functions, improving both dispensing efficiency and safety.

[0039] A further optimized solution is provided, in which the drug suction mechanism includes a second connecting plate 6 fixedly connected to the bottom surface of the first connecting plate 3, a first slide groove 7 being provided at the bottom of the second connecting plate 6, a first slider 8 being symmetrically slidably connected in the first slide groove 7, a clamping block 9 being fixedly connected to the end of the first slider 8 away from the first connecting shaft 2, an end of the clamping block 9 close to the first slide groove 7 being slidably connected in the first slide groove 7, a first driving part being provided at the end of the first slider 8 away from the clamping block 9, and the first driving part being fixed to the second connecting plate 6.

[0040] According to a further optimized solution, the first driving part includes a first motor 10 fixedly connected to the second connecting plate 6 , and the output shaft of the first motor 10 is fixedly connected to a forward and reverse screw 11 , which is threadedly connected to the two first sliders 8 respectively.

[0041] A first motor 10 drives the forward and reverse screws 11, which in turn drive the two first sliders 8 to slide within the first chute 7. The clamping block 9 then moves inward or outward to clamp or release the dispenser, connecting the dispenser to the negative pressure mechanism. The bidirectional screws achieve symmetrical clamping, accommodating dispensers of varying diameters and preventing tipping risks.

[0042] To further optimize the solution, a second slide groove 12 is provided on the side of the first connecting shaft 2 close to the first connecting plate 3, the first connecting plate 3 is slidably connected in the second slide groove 12, the top surface of the first connecting shaft 2 is fixedly connected to the second motor 13, the output shaft of the second motor 13 is fixedly connected to the first screw 14, the bottom of the first screw 14 rotates with the bottom of the second slide groove 12, and the first connecting plate 3 is threadedly connected to the first screw 14.

[0043] The second motor 13 drives the first screw 14 to rotate, driving the first connecting plate 3 to slide up and down along the second slide groove 12 to adjust the vertical position of the drug aspirating mechanism. This allows for precise control of the insertion depth of the needle in the drug dispenser to avoid liquid splashing due to improper distance.

[0044] A further optimized solution is provided, in which the limiting mechanism includes a flexible airbag 15 arranged on the inner wall of the first groove 5, a first cavity 16 is provided in the connecting seat 4, an air inlet 17 and an exhaust port 18 are respectively provided in the flexible airbag 15, a first valve 19 is provided in the air inlet 17, a second valve 20 is provided in the exhaust port 18, the exhaust port 18 is connected with the first cavity 16, a micro air pump 21 is provided in the first cavity 16, the micro air pump 21 is connected with a first connecting pipe 22, the first connecting pipe 22 is located in the first cavity 16, and the first connecting pipe 22 is connected with the air inlet 17.

[0045] The micro pump 21 inflates the flexible airbag 15 through the first connecting tube 22. When the airbag expands, it squeezes the ampoule and secures it. When the airbag deflates, it contracts and releases the ampoule. This flexible fixation reduces stress on the ampoule and prevents the glass ampoule from breaking.

[0046] A further optimized solution is that the crushing mechanism includes a crushing ring 23 rotatably connected to the first connecting shaft 2, a crushing rod 24 is fixed inside the crushing ring 23, a first through hole 25 is provided on the crushing ring 23, the crushing rod 24 passes through the first through hole 25, and a screw 26 is passed through the crushing ring 23, which abuts against the outer wall of the first connecting shaft 2.

[0047] As a further optimized solution, a third sliding groove 27 is provided on the outer wall of the first connecting shaft 2 , and the breaking rod 24 is slidably connected in the third sliding groove 27 .

[0048] The crushing ring 23 rotates with the first connecting shaft 2, driving the crushing rod 24 to impact and crush the top of the ampoule.

[0049] To further optimize the solution, a second cavity 28 is provided in the base 1, a third motor 29 is provided in the second cavity 28, the output shaft of the third motor 29 is fixedly connected to the first bevel gear 30, the bottom surface of the first connecting shaft 2 extends into the second cavity 28 and is fixedly connected to the second bevel gear 31, and the first bevel gear 30 is meshed with the second bevel gear 31.

[0050] The third motor 29 drives the first bevel gear 30 to drive the second bevel gear 31 to rotate the first connecting shaft 2 .

[0051] According to a further optimized solution, the negative pressure mechanism includes a negative pressure box 32 fixedly connected to the top surface of the first connecting plate 3 .

[0052] According to a further optimized solution, the shape of the clamping block 9 is an arc.

[0053] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0054] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A splash-proof chemotherapy drug dispenser for hematology and oncology nursing, characterized by: The invention comprises a base (1), wherein the top surface of the base (1) is rotatably connected to a first connecting shaft (2), the first connecting shaft (2) is slidably connected to a first connecting plate (3), the bottom of the first connecting plate (3) away from the first connecting shaft (2) is provided with a drug suction mechanism, the top surface of the base (1) is fixed with a plurality of connecting seats (4) at equal intervals in the circumferential direction, the connecting seats (4) are provided with a first groove (5), the first groove (5) is provided with a limiting mechanism for fixing an ampoule bottle, the drug suction mechanism is located above the first groove (5) adjacent thereto, the first connecting shaft (2) is provided with a crushing mechanism, the crushing mechanism is located above the connecting seat (4), and the top surface of the first connecting plate (3) is provided with a negative pressure mechanism.

2. The splash-proof chemotherapy drug dispenser for hematology and oncology nursing according to claim 1 is characterized by: The drug suction mechanism includes a second connecting plate (6) fixedly connected to the bottom surface of the first connecting plate (3), a first sliding groove (7) is provided at the bottom of the second connecting plate (6), a first slider (8) is symmetrically slidably connected in the first sliding groove (7), a clamping block (9) is fixedly connected to the end of the first slider (8) away from the first connecting shaft (2), and the end of the clamping block (9) close to the first sliding groove (7) is slidably connected in the first sliding groove (7), a first driving part is provided at the end of the first slider (8) away from the clamping block (9), and the first driving part is fixedly connected to the second connecting plate (6).

3. The splash-proof chemotherapy drug dispenser for hematology and oncology nursing according to claim 2, characterized in that: The first driving part comprises a first motor (10) fixedly connected to the second connecting plate (6); the output shaft of the first motor (10) is fixedly connected to a forward and reverse screw (11); and the forward and reverse screw (11) is respectively threadedly connected to the two first sliders (8).

4. The splash-proof chemotherapy drug dispenser for hematology and oncology nursing according to claim 1, characterized in that: A second slide groove (12) is provided on one side of the first connecting shaft (2) close to the first connecting plate (3), the first connecting plate (3) is slidably connected in the second slide groove (12), the top surface of the first connecting shaft (2) is fixedly connected to a second motor (13), the output shaft of the second motor (13) is fixedly connected to a first lead screw (14), the bottom of the first lead screw (14) rotates with the bottom of the second slide groove (12), and the first connecting plate (3) is threadedly connected to the first lead screw (14).

5. The splash-proof chemotherapy drug dispenser for hematology and oncology nursing according to claim 1, characterized in that: The limiting mechanism comprises a flexible airbag (15) arranged on the inner wall of the first groove (5); a first cavity (16) is provided in the connecting seat (4); an air inlet (17) and an air outlet (18) are respectively provided in the flexible airbag (15); a first valve (19) is provided in the air inlet (17); a second valve (20) is provided in the air outlet (18); the air outlet (18) is communicated with the first cavity (16); a micro air pump (21) is provided in the first cavity (16); the micro air pump (21) is communicated with a first connecting pipe (22); the first connecting pipe (22) is located in the first cavity (16); and the first connecting pipe (22) is communicated with the air inlet (17).

6. The splash-proof chemotherapy drug dispenser for hematology and oncology nursing according to claim 1, characterized in that: The crushing mechanism comprises a crushing ring (23) rotatably connected to the first connecting shaft (2), a crushing rod (24) fixedly connected to the crushing ring (23), a first through hole (25) provided on the crushing ring (23), the crushing rod (24) passing through the first through hole (25), a screw (26) passing through the crushing ring (23), and the screw (26) abutting against the outer wall of the first connecting shaft (2).

7. The splash-proof chemotherapy drug dispenser for hematology and oncology nursing according to claim 6, characterized in that: The outer wall of the first connecting shaft (2) is provided with a third sliding groove (27), and the breaking rod (24) is slidably connected in the third sliding groove (27).

8. The splash-proof chemotherapy drug dispenser for hematology and oncology nursing according to claim 1, characterized in that: A second cavity (28) is provided in the base (1), a third motor (29) is provided in the second cavity (28), an output shaft of the third motor (29) is fixedly connected to a first bevel gear (30), a bottom surface of the first connecting shaft (2) extends into the second cavity (28) and is fixedly connected to a second bevel gear (31), and the first bevel gear (30) is meshed with the second bevel gear (31).

9. The splash-proof chemotherapy drug dispenser for hematology and oncology nursing according to claim 1, characterized in that: The negative pressure mechanism comprises a negative pressure box (32) fixedly connected to the top surface of the first connecting plate (3).

10. The splash-proof chemotherapy drug dispenser for hematology and oncology nursing according to claim 2, characterized in that: The shape of the clamping block (9) is an arc.

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