Volume-adjustable medicine storage system and quantitative liquid medicine filling method

Abstract

The invention discloses a volume-adjustable medicine storage system and a quantitative liquid medicine filling method, and relates to the technical field of medical instruments, in particular to a volume-adjustable medicine storage system which comprises a medicine bin, a liquid medicine filling device, a liquid medicine filling device, a liquid medicine filling device, a liquid medicine filling device and a liquid medicine filling device, the driving assembly comprises an output sleeve and a threaded sleeve which are coaxially arranged in a sliding mode, the output sleeve and the medicine bin are arranged in a relative rotating mode, the threaded sleeve and the threaded rod are installed in a thread meshing mode, and a locking control assembly used for locking the axial relative movement of the output sleeve and the threaded sleeve is arranged between the output sleeve and the threaded sleeve; according to the volume-adjustable medicine storage system and the quantitative liquid medicine filling method, by arranging the locking control assembly, the locking state between the piston and the driving assembly can be switched, then the requirement for adjusting the volume of the medicine bin is met, injection of the liquid medicine with the specific volume is met, and then the situation that the liquid medicine is wasted due to expiration is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more specifically, to a volume-adjustable drug storage system. In addition, the present invention also relates to a quantitative filling method of a drug solution applied to the volume-adjustable drug storage system. Background Art

[0002] In the management of diabetes, insulin pumps are important devices that simulate the function of the human pancreas. They have the function of continuous insulin infusion and can significantly improve the blood sugar control effect of patients. Traditional insulin pumps usually use a fixed volume of liquid medicine storage design. This method exposes the following problems in the application of patch-type insulin pumps:

[0003] Waste of medicine: The amount of insulin used by patients varies according to individual differences and treatment plans, but existing pumps usually require patients to inject a fixed amount of insulin. If the injected amount is greater than the actual amount used, the unused medicine will be wasted due to the expiration of the pump validity period (usually 3 days).

[0004] Capacity adjustment limitation: The existing fixed capacity design makes it difficult to flexibly adjust the storage volume of drug solution according to patient needs, and cannot meet the personalized needs of different patients.

[0005] In summary, how to solve the problem that the fixed capacity of the existing insulin pump cannot be adjusted, resulting in excessive waste of drug solution, is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a capacity-adjustable medicine storage system. By setting a locking control component, the locking state between the piston and the driving component can be switched, thereby meeting the volume adjustment requirements of the medicine chamber, adapting to the injection of a specific volume of medicine liquid, and avoiding the overdue waste of medicine liquid.

[0007] Another object of the present invention is to provide a method for quantitatively filling a liquid medicine applied to the above-mentioned volume-adjustable medicine storage system, which can quickly fill the required volume of liquid medicine, thereby avoiding overdue waste of liquid medicine.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A drug storage system with adjustable capacity, comprising:

[0010] A medicine chamber, wherein a piston is provided in a sealing and sliding manner inside, and a screw is fixedly provided on the piston along the feeding direction;

[0011] The drive assembly includes an output sleeve and a screw sleeve which are coaxially arranged for sliding. The output sleeve and the medicine bin are arranged for relative rotation. The screw sleeve and the screw rod are installed through threaded engagement. A locking control assembly is provided between the output sleeve and the screw sleeve for locking the axial relative movement of the two.

[0012] Preferably, the locking control assembly comprises a pawl and a ratchet;

[0013] The pawl is rotatably mounted on the output sleeve, and a plurality of groups of ratchets are fixedly arranged on the outside of the screw sleeve along the axial direction of the screw sleeve;

[0014] A torsion spring is arranged between the pawl and the output sleeve, and is used to make the pawl mesh with the ratchet teeth, so as to limit the relative axial movement of the screw sleeve and the output sleeve.

[0015] Preferably, a locking tooth is fixedly provided inside the ratchet pawl for fixing and locking relative to the medicine bin;

[0016] When the locking tooth and the medicine chamber are relatively fixed and locked, the pawl and the ratchet tooth are unlocked, and the torsion spring is in a compressed energy storage state;

[0017] When the locking tooth and the medicine chamber are unlocked relative to each other, the torsion spring drives the pawl to reset so that the pawl is engaged with the ratchet tooth.

[0018] Preferably, a locking groove is relatively fixedly arranged in the medicine bin for the locking tooth to engage with, so that the locking tooth and the medicine bin are relatively fixedly locked;

[0019] The opening direction of the locking groove is consistent with the feeding direction of the output sleeve;

[0020] When the output sleeve is fed to a set angle, the locking tooth can be disengaged from the locking groove, so that the locking tooth and the medicine chamber are unlocked.

[0021] Preferably, the contact surface between the screw sleeve and the output sleeve is a non-circular circumferential surface, which is used to limit the relative rotation of the screw sleeve and the output sleeve.

[0022] Preferably, the contact surface between the piston and the medicine chamber is a non-circular circumferential surface for limiting the relative rotation of the piston and the medicine chamber, and a piston sealing ring is provided on the contact surface between the piston and the medicine chamber for increasing the sealing between the piston and the inner wall of the medicine chamber.

[0023] Preferably, it also includes a liquid level rod and a liquid level contact, the liquid level rod is fixedly arranged along the feeding direction of the piston and fixedly connected to the piston, the liquid level contact is fixedly arranged relative to the medicine chamber, and when the piston moves to a set position, the liquid level rod can conduct the liquid level contact.

[0024] Preferably, the liquid level rod and the liquid level contact are both arranged on the liquid non-contact side of the piston;

[0025] A plurality of groups of the liquid level contacts are arranged at intervals along the feeding direction of the piston. When the piston moves toward the non-contact side of the liquid medicine, the liquid level contacts at corresponding positions can be turned on in sequence.

[0026] Preferably, it further comprises a base, in which a snap assembly for snapping into the medicine bin is disposed, and the drive assembly is fixedly arranged relative to the base.

[0027] A method for quantitatively filling liquid medicine is applied to the above-mentioned volume-adjustable medicine storage system, and the method for quantitatively filling liquid medicine comprises the following steps:

[0028] Controlling the locking control assembly to release the locking of the output sleeve and the screw sleeve;

[0029] Controlling the pipette to inject a fixed amount of liquid medicine into the medicine chamber through the infusion port of the medicine chamber, and driving the piston to move toward the non-contact side of the medicine chamber;

[0030] Controlling the locking control assembly to lock the output sleeve with the screw sleeve;

[0031] The driving assembly is controlled to move and push the piston forward to discharge the gas that may exist in the medicine chamber.

[0032] Compared with the prior art, the capacity-adjustable drug storage system provided by the present invention has at least the following beneficial effects:

[0033] By setting a locking control component, the locking state switching between the output sleeve and the screw sleeve is realized, and the state switching of the power transmission between the drive component and the piston is realized. When the locking control component is in the locking state, the drive component can normally drive the piston to feed and realize the infusion of the medicine solution. However, when the locking control component is in the unlocking device, the power transmission between the drive component and the piston is in the middle, and the piston can move freely, that is, the volume of the medicine chamber can be freely adjusted to adapt to the filling of different volumes of medicine solution, that is, to meet the user's demand for filling the required amount of medicine solution according to demand, avoiding the waste of medicine solution overdue.

[0034] The quantitative filling method of liquid medicine provided by the present invention is applied to the above-mentioned capacity-adjustable medicine storage system, and can quickly add the required amount of liquid medicine through the infusion port of the medicine bin. The filling amount of liquid medicine is flexibly controllable, avoiding the waste of liquid medicine due to overdue period. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0036] Figure 1 This is a schematic diagram of the structure of a specific capacity-adjustable drug storage system provided by the present invention;

[0037] Figure 2 A cross-sectional view of a specific capacity-adjustable drug storage system provided by the present invention;

[0038] Figure 3 It is a schematic diagram of the assembly of a specific locking control assembly provided by the present invention;

[0039] Figure 4 A schematic cross-sectional view of a specific output sleeve, a screw sleeve and a screw provided by the present invention;

[0040] FIG5 is a schematic structural diagram of a specific pawl provided by the present invention;

[0041] FIG6 is a schematic structural diagram of a specific base provided by the present invention;

[0042] FIG7 is a schematic diagram of the structure of a specific driving assembly provided by the present invention;

[0043] FIG8 is a schematic diagram of the internal structure of the initial state of the specific capacity-adjustable drug storage system provided by the present invention;

[0044] FIG9 is a schematic diagram of the internal structure of the specific capacity-adjustable drug storage system provided by the present invention in a state where drug liquid filling is completed;

[0045] FIG10 is a schematic diagram of the internal structure of the specific capacity-adjustable drug storage system provided by the present invention after the capacity is locked;

[0046] FIG11 is a schematic diagram of the internal structure of the specific volume-adjustable drug storage system provided by the present invention during the drug solution infusion process;

[0047] FIG. 12 is a schematic flow chart of a specific method for quantitatively adding liquid medicine provided by the present invention.

[0048] Figure 1-Figure 1 1 in:

[0049] 1. Medicine chamber; 2. Base; 21. Locking groove; 3. Drive assembly; 31. Drive paddle; 32. Memory wire; 33. Reset spring; 34. Check paddle; 35. Output sleeve; 4. Locking control assembly; 41. Ratchet; 42. Locking tooth; 43. Torsion spring; 5. Screw sleeve; 51. Ratchet; 6. Piston; 61. Piston sealing ring; 7. Liquid level rod; 8. Liquid level contact; 9. Screw. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0051] The core of the present invention is to provide a capacity-adjustable medicine storage system. By setting a locking control component, the locking state between the piston and the driving component can be switched, thereby meeting the volume adjustment requirements of the medicine chamber, adapting to the injection of a specific volume of medicine liquid, and avoiding the overdue waste of medicine liquid.

[0052] Another core of the present invention is to provide a method for quantitatively filling liquid medicine applied to the above-mentioned capacity-adjustable medicine storage system, which can quickly fill the required volume of liquid medicine, thereby avoiding overdue waste of liquid medicine.

[0053] Please refer to Figure 1 - Figure 7, a drug storage system with adjustable capacity, comprising:

[0054] The medicine chamber 1 has a piston 6 which is sealed and slidably arranged inside, and a screw 9 is fixedly arranged on the piston 6 along the feeding direction;

[0055] The driving assembly 3 includes an output sleeve 35 and a screw sleeve 5 which are coaxially arranged for sliding. The output sleeve 35 and the medicine chamber 1 are arranged for relative rotation. The screw sleeve 5 and the screw rod 9 are installed through threaded engagement. A locking control assembly 4 is provided between the output sleeve 35 and the screw sleeve 5 for locking the axial relative movement of the two.

[0056] like Figure 1-Figure 3As shown, the medicine chamber 1 is operated by the piston 6 which is installed in a sealed sliding manner to realize the infusion of the medicine liquid, wherein the feeding of the piston 6 mainly depends on the thread action between the screw 9 and the screw sleeve 5, that is, when the screw 9 and the screw sleeve 5 rotate relatively, the two can move axially relative to each other under the action of the thread, wherein the screw sleeve 5 and the output sleeve 35 are coaxially slidably arranged, when the output sleeve 35 rotates under the action of the driving component 3, it can drive the screw sleeve 5 to rotate synchronously, and after adding the locking control component 4, the axial relative movement of the screw sleeve 5 and the output sleeve 35 can be limited, so that the screw sleeve 5 can only rotate with the output sleeve 35, and during the rotation process, the screw 9 and the piston 6 are driven to feed axially to realize the infusion of the medicine liquid;

[0057] When the medicine is injected in reverse, the locking control component 4 is unlocked, and the piston 6 pushes the screw 9 and the sleeve 5 in the opposite direction. At this time, the locking control component 4 no longer restricts the relative axial movement of the sleeve 5 and the output sleeve 35, thereby realizing the capacity adjustment of the medicine chamber 1 to adapt to the filling of medicines of different volumes, so that the user can choose the filling amount according to the needs to avoid the waste of medicines overdue.

[0058] In some embodiments, the locking control assembly 4 includes a pawl 41 and a ratchet 51;

[0059] The ratchet 41 is rotatably mounted with the output sleeve 35, and a plurality of groups of ratchet teeth 51 are fixedly arranged on the outer side of the screw sleeve 5 along the axial direction of the screw sleeve 5;

[0060] A torsion spring 43 is provided between the pawl 41 and the output sleeve 35, for engaging the pawl 41 with the ratchet teeth 51, so as to limit the relative axial movement of the screw sleeve 5 and the output sleeve 35;

[0061] like Figure 2 and Figure 3 As shown, the locking control assembly 4 adopts a combination of a pawl 41 and a ratchet 51. When the pawl 41 is engaged with the ratchet 51, the output sleeve 35 and the screw sleeve 5 are locked. When the pawl 41 is disengaged from the ratchet 51, the output sleeve 35 and the screw sleeve 5 are unlocked, and the locking state can be switched quickly and conveniently.

[0062] The ratchet 41 is driven by a torsion spring 43 and has the advantages of fast movement and sensitive control.

[0063] In some embodiments, a locking tooth 42 is fixedly disposed inside the ratchet 41 for fixing and locking relative to the medicine chamber 1;

[0064] When the locking tooth 42 is relatively fixed and locked with the medicine chamber 1, the pawl 41 and the ratchet tooth 51 are unlocked, and the torsion spring 43 is in a compressed energy storage state;

[0065] When the locking tooth 42 is unlocked relative to the medicine chamber 1, the torsion spring 43 drives the pawl 41 to reset, so that the pawl 41 is engaged with the ratchet tooth 51;

[0066] As shown in Figure 5 and Figure 1 As shown, by adding a locking tooth 42 inside the pawl 41, the position of the pawl 41 of the locking control assembly 4 is fixed in the unlocked state, thereby ensuring smooth filling of the liquid medicine.

[0067] In some embodiments, a locking groove 21 is relatively fixedly arranged in the medicine bin 1 for the locking tooth 42 to engage with, so that the locking tooth 42 is relatively fixedly locked with the medicine bin 1;

[0068] The opening direction of the locking groove 21 is consistent with the feeding direction of the output sleeve 35;

[0069] When the output sleeve 35 is fed to a set angle, the locking tooth 42 can be disengaged from the locking groove 21, so that the locking tooth 42 and the medicine chamber 1 are unlocked;

[0070] As shown in FIGS. 8 to 11 , a locking groove 21 is provided in the base 2. When the liquid medicine is added, the locking tooth 42 is engaged in the locking groove 21, so that the ratchet 41 and the ratchet 51 remain in a non-engaged state. At this time, the axial movement of the screw sleeve 5 is not restricted by the output sleeve 35.

[0071] After the liquid medicine is filled, the driving assembly 3 is activated to drive the output sleeve 35 to rotate, which can drive the ratchet 41 to rotate synchronously. Since the opening direction of the locking groove 21 is consistent with the feeding direction of the output sleeve 35, the locking tooth 42 automatically disengages from the locking groove 21, and then the ratchet 41 is quickly reset under the action of the torsion spring 43 and meshes with the ratchet 51 to achieve the locking of the output sleeve 35 and the screw sleeve 5, so that the output sleeve 35 and the screw sleeve 5 form a relatively fixed whole, and through rotation, the screw 9 and the piston 6 are driven to feed;

[0072] After the locking tooth 42 is reset with the ratchet 41, it has a certain distance from the locking groove 21. In the subsequent infusion process, the locking tooth 42 cannot enter the locking groove 21 again, which prevents the piston 6 from moving in the opposite direction again, and prevents the medicine chamber 1 from being repeatedly filled with liquid medicine and recycled, thereby preventing cross infection.

[0073] In some embodiments, the locking control assembly 4 adopts other structures, such as an electromagnetic lock structure, to achieve the switching of the locking state between the screw sleeve 5 and the output sleeve 35, which also belongs to the protection scope of this application;

[0074] At the same time, as shown in FIG7 , the driving assembly 3 adopts the principle that a ratchet is fixedly arranged on the output sleeve 35, and the temperature of the memory wire 32 changes by being energized, and switches between the contracted state and the stretched state. In combination with the action of the reset spring 33, the driving paddle 31 drives the ratchet to rotate. During the process, the action of the check paddle 34 is used to prevent the ratchet from reversing. Then, by controlling the number of state switching times of the memory wire 32, the rotation angle of the ratchet and the output sleeve 35 is accurately controlled, that is, the feed amount of the piston 6 and the amount of liquid medicine infusion are accurately controlled;

[0075] In some embodiments, a stepper motor, servo motor or other means is used to drive the output sleeve 35 to rotate, thereby driving the piston 6 to feed, which also falls within the protection scope of the present application.

[0076] In some embodiments, the contact surface between the screw sleeve 5 and the output sleeve 35 is a non-circular circumferential surface, which is used to limit the relative rotation between the screw sleeve 5 and the output sleeve 35;

[0077] like Figure 4 As shown, by making the contact surface of the screw sleeve 5 and the output sleeve 35 non-circular, so that the two cannot rotate relative to each other, or the screw sleeve 5 and the output sleeve 35 are connected in a spline form, which also falls within the protection scope of the present application.

[0078] In some embodiments, the contact surface between the piston 6 and the medicine chamber 1 is a non-circular circumferential surface, which is used to limit the relative rotation between the piston 6 and the medicine chamber 1, and a piston sealing ring 61 is provided on the contact surface between the piston 6 and the medicine chamber 1 to increase the sealing between the piston 6 and the inner wall of the medicine chamber 1;

[0079] The contact surface between the piston 6 and the medicine chamber 1 also adopts a non-circular circumferential surface, such as a piston 6 with an elliptical cross-section. The purpose is also to avoid relative rotation between the piston 6 and the medicine chamber 1 during the feeding process. At the same time, a piston sealing ring 61 is arranged at the contact surface, which can effectively improve the sealing performance of the piston 6.

[0080] In some embodiments, it also includes a liquid level rod 7 and a liquid level contact 8. The liquid level rod 7 is fixedly arranged along the feeding direction of the piston 6 and is fixedly connected to the piston 6. The liquid level contact 8 is fixedly arranged relative to the medicine chamber 1. When the piston 6 moves to the set position, the liquid level rod 7 can conduct the liquid level contact 8.

[0081] As shown in FIG8 , the liquid level contact 8 is set at a set position. When the drug solution is added, when the piston 6 moves to the minimum required liquid level for drug solution infusion, the liquid level rod 7 conducts with the liquid level contact 8, and the liquid level contact 8 acts as a travel switch, and feeds back a signal to the control unit to activate the entire system. Similarly, when the drug solution is infused, when the piston 6 moves to the liquid level contact 8, the conduction state of the liquid level contact 8 changes, and a signal can be fed back to inform the user to pay attention to the problem of drug solution inventory, and the control system calculates the remaining feed amount of the piston 6, controls the remaining movement of the piston 6, and automatically stops after the infusion is completed.

[0082] In some embodiments, the liquid level contact 8 uses two groups of non-conductive metal springs, and the liquid level rod 7 is made of a metal conductive rod. When the liquid level rod 7 reaches the position of the liquid level contact 8, the liquid level rod 7 conducts the two groups of metal springs and then sends a signal. When the liquid level rod 7 is away from the liquid level contact 8, the two groups of liquid level contacts 8 are disconnected and the signal disappears. The change of the signal is used to realize the change of the control instruction of the control unit.

[0083] In some embodiments, the liquid level rod 7 and the liquid level contact 8 are both disposed on the liquid non-contact side of the piston 6;

[0084] Several groups of liquid level contacts 8 are arranged at intervals along the feeding direction of the piston 6. When the piston 6 moves toward the non-contact side of the liquid medicine, the liquid level contacts 8 at the corresponding positions can be turned on in sequence.

[0085] The liquid level rod 7 and the liquid level contact 8 are arranged on the non-liquid contact side of the piston 6 to avoid contamination of the liquid medicine and influence on the actual volume of the medicine chamber 1;

[0086] At the same time, more than one group of liquid level contacts 8 are provided. By detecting the positions of the conductive liquid level contacts 8 , the position of the piston 6 can be inferred, that is, the remaining amount of medicine in the medicine chamber 1 can be inferred.

[0087] In some embodiments, a base 2 is further included, in which a buckle assembly for clamping the medicine bin 1 is arranged, and the drive assembly 3 is fixedly arranged relative to the base 2;

[0088] A base 2 is provided, and the drive assembly 3, the locking groove 21, and the liquid level contact 8 are all fixedly mounted on the base 2, and the medicine chamber 1 is fixed by a snap assembly, thereby facilitating the improvement of the assembly flexibility between the medicine chamber 1 and the drive assembly 3, and at the same time helping to reduce the production cost and processing difficulty of the overall system.

[0089] In addition to the capacity-adjustable drug storage system disclosed in the above-mentioned embodiments, the present invention also provides a method for quantitatively filling a drug solution applied to the capacity-adjustable drug storage system.

[0090] As shown in FIG12 , the method for quantitatively adding liquid medicine includes the following steps:

[0091] Control the locking control assembly 4 to release the locking of the output sleeve 35 and the screw sleeve 5;

[0092] Control the pipette to inject a certain amount of liquid medicine into the medicine chamber 1 through the infusion port of the medicine chamber 1, and drive the piston 6 to move toward the non-contact side of the medicine chamber 1;

[0093] Control the locking control assembly 4 to lock the output sleeve 35 and the screw sleeve 5;

[0094] The driving assembly 3 is controlled to move and push the piston 6 to feed so as to discharge the gas that may exist in the medicine chamber 1 .

[0095] As shown in FIG8 , in the initial state, the piston 6 is at the distal end, and the locking control assembly 4 is in the unlocked state, that is, the axial relative movement of the output sleeve 35 and the screw sleeve 5 is not restricted, and at this time, the locking tooth 42 is clamped in the locking groove 21, and the torsion spring 43 is in a compressed energy storage state;

[0096] As shown in FIG9 , after a certain amount of liquid medicine is added to the medicine chamber 1 by a pipette, the piston 6 moves to the proximal position, and then because the liquid level contact 8 is in a conducting state, the system is in an activated state at this time, and the driving component 3 is controlled by the control unit to move;

[0097] As shown in Figure 10, when the output sleeve 35 rotates, the pawl 41 rotates synchronously, driving the locking tooth 42 to disengage from the locking groove 21. Under the action of the torsion spring 43, the pawl 41 quickly resets and engages with the ratchet 51, thereby achieving the locking of the screw sleeve 5 and the output sleeve 35. At this time, the volume of the medicine chamber 1 is determined. Thereafter, as shown in Figure 11, the screw sleeve 5 can rotate synchronously with the output sleeve 35 to complete the infusion of the medicine solution.

[0098] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0099] The above is a detailed introduction to the adjustable capacity drug storage system and the quantitative drug liquid filling method provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A drug storage system with adjustable capacity, characterized in that: include: A medicine chamber (1) having a piston (6) provided therein in a sealing and sliding manner, wherein a screw (9) is fixedly provided on the piston (6) along a feeding direction; The drive assembly (3) comprises an output sleeve (35) and a screw sleeve (5) which are coaxially slidably arranged, the output sleeve (35) and the medicine chamber (1) being arranged to rotate relative to each other, the screw sleeve (5) and the screw rod (9) being mounted via threaded engagement, and a locking control assembly (4) for locking the axial relative movement of the output sleeve (35) and the screw sleeve (5) being arranged between the output sleeve (35) and the screw sleeve (5).

2. The capacity-adjustable drug storage system according to claim 1, characterized in that: The locking control assembly (4) comprises a pawl (41) and a ratchet (51); The ratchet pawl (41) is rotatably mounted on the output sleeve (35), and a plurality of groups of ratchet teeth (51) are fixedly arranged on the outside of the screw sleeve (5) along the axial direction of the screw sleeve (5); A torsion spring (43) is provided between the pawl (41) and the output sleeve (35) for enabling the pawl (41) to mesh with the ratchet teeth (51) to limit the relative axial movement of the screw sleeve (5) and the output sleeve (35).

3. The capacity-adjustable drug storage system according to claim 2, characterized in that: A locking tooth (42) is fixedly disposed inside the ratchet pawl (41) and is used to be fixedly locked relative to the medicine bin (1); When the locking tooth (42) and the medicine chamber (1) are relatively fixed and locked, the ratchet pawl (41) and the ratchet tooth (51) are unlocked, and the torsion spring (43) is in a compressed energy storage state; When the locking tooth (42) is unlocked relative to the medicine chamber (1), the torsion spring (43) drives the ratchet pawl (41) to reset, so that the ratchet pawl (41) meshes with the ratchet tooth (51).

4. The capacity-adjustable drug storage system according to claim 3, characterized in that: A locking groove (21) is relatively fixedly arranged in the medicine bin (1) for being engaged with the locking tooth (42) so that the locking tooth (42) and the medicine bin (1) are relatively fixedly locked; The opening direction of the locking groove (21) is consistent with the feeding direction of the output sleeve (35); When the output sleeve (35) is fed to a set angle, the locking tooth (42) can be disengaged from the locking groove (21), so that the locking tooth (42) and the medicine chamber (1) are unlocked.

5. The capacity-adjustable drug storage system according to claim 1, characterized in that: The contact surface between the screw sleeve (5) and the output sleeve (35) is a non-circular circumferential surface, which is used to limit the relative rotation of the screw sleeve (5) and the output sleeve (35).

6. The capacity-adjustable drug storage system according to claim 1, characterized in that: The contact surface between the piston (6) and the medicine chamber (1) is a non-circular circumferential surface, which is used to limit the relative rotation of the piston (6) and the medicine chamber (1), and a piston sealing ring (61) is provided on the contact surface between the piston (6) and the medicine chamber (1) to increase the sealing performance between the piston (6) and the inner wall of the medicine chamber (1).

7. The capacity-adjustable drug storage system according to claim 1, characterized in that: It also includes a liquid level rod (7) and a liquid level contact (8), wherein the liquid level rod (7) is fixedly arranged along the feeding direction of the piston (6) and is fixedly connected to the piston (6), and the liquid level contact (8) is fixedly arranged relative to the medicine chamber (1), and when the piston (6) moves to a set position, the liquid level rod (7) can conduct the liquid level contact (8).

8. The capacity-adjustable drug storage system according to claim 7, characterized in that: The liquid level rod (7) and the liquid level contact (8) are both arranged on the liquid non-contact side of the piston (6); A plurality of groups of the liquid level contacts (8) are arranged at intervals along the feeding direction of the piston (6), and when the piston (6) moves toward the liquid non-contact side, the liquid level contacts (8) at corresponding positions can be turned on in sequence.

9. The capacity-adjustable drug storage system according to any one of claims 1 to 8, characterized in that: It also comprises a base (2), wherein a buckle assembly for clamping the medicine bin (1) is arranged inside the base (2), and the drive assembly (3) is fixedly arranged relative to the base (2).

10. A method for quantitatively filling a liquid medicine, characterized in that: Applicable to the volume-adjustable drug storage system according to any one of claims 1 to 9, the method for quantitatively filling the drug solution comprises the following steps: Controlling the locking control assembly (4) to release the locking between the output sleeve (35) and the screw sleeve (5); Controlling the pipette to inject a predetermined amount of liquid medicine into the medicine chamber (1) through the infusion port of the medicine chamber (1), and driving the piston (6) to move toward the non-liquid medicine contact side; Controlling the locking control component (4) to lock the output sleeve (35) and the screw sleeve (5); The driving assembly (3) is controlled to move, and the piston (6) is pushed forward to discharge gas that may be present in the medicine chamber (1).

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