A liquid transfer filter with an eccentric needle and a filtering structure

Abstract

The present invention relates to a drug transfer filter with an eccentric needle and a filtering structure, comprising a drug mixing card body (1), a hollow cross needle (2) and a clamping structure (3), wherein the hollow cross needle (2) comprises a needle seat (21) and a hollow needle (22), the needle openings at both ends of the hollow needle (22) are progressive openings, and a filter is arranged at the needle seat (21). The progressive opening is an opening whose opening area gradually increases by cutting sideways along the conical surface of the needle at both ends, the progressive opening at the end of the drug mixing card body is a composite surface, and the end of the clamping structure is an inclined plane. Compared with the prior art, the present invention has the advantages of high safety and wide application range.

Description

Technical Field

[0001] The invention relates to a drug liquid transfer filter, in particular to a drug liquid transfer filter with an eccentric needle and a filtering structure. Background Art

[0002] At present, when using freeze-dried and powder injections in vials, it is necessary to use a syringe to draw out the liquid medicine or water for injection from the infusion bag and inject it into the vial until there is enough liquid medicine in the vial; then shake the vial to mix the medicine evenly, and then use a syringe to draw out the liquid medicine from the vial and inject it into the infusion bag. This operation process has many disadvantages. First, the syringe repeatedly pierces the rubber stoppers of the vial and the infusion bag, which not only easily produces rubber crumbs, but also the needle contacts the air and then the liquid medicine. These factors all contaminate the liquid medicine, thus causing drug safety problems; secondly, the traditional method of preparing the liquid is to prepare the medicine first and then inject it. The medicine in the vial is sucked into the infusion bag in advance, and then the prepared infusion bag is brought to the ward for infusion. After the medicine is prepared, the empty vial is placed aside, and the patients and medical staff have no idea what medicine is in the infusion bag, and there is no traceability. If medical staff are not careful when dispensing the liquid and the liquid medicine overflows, or mixes and uses the wrong liquid medicine, it will seriously affect the health of medical staff and the treatment of patients. In addition, for some special drugs, such as those that need to be prepared and used immediately, the traditional method of dispensing is very inconvenient.

[0003] The prior art also discloses a drug mixing nozzle that can achieve mixing of drug and solvent with only one puncture:

[0004] CN202459338U discloses a double-needle drug mixing nozzle with a protective sleeve, wherein the double needle consists of a needle seat, an upper needle and a lower needle, the upper needle and the lower needle are arranged on both sides of the needle seat, the upper needle and the lower needle are both hollow structures and are interconnected, and extend along the edge of the needle seat toward the upper needle to form a drug mixing body with a cup structure, and a retractable protective sleeve is sleeved on the lower needle; at least two anti-slip buckles in the shape of barbs are symmetrically arranged on the inner wall of the drug mixing body to prevent the vial from loosening. The design of the drug mixing nozzle in the above prior art only requires one puncture to achieve drug mixing, thus preventing drug liquid contamination, facilitating operation by medical staff, and achieving a simple, convenient and safe drug dispensing process.

[0005] However, the above products still have the following defects in actual use: the liquid passages of some large infusion packages on the market are not located at the center of the infusion cap, and the double-valve infusion cap has two liquid passages, neither of which is located at the center of the infusion cap; after the mixing cup and the infusion bag / bottle are connected, the connection is unstable, displaced, shaken, or the mixing cup slips out during use, resulting in drug contamination, so there are relatively serious safety hazards; in the clinical use of the existing mixing cup, the vial cannot be pulled out after the vial is inserted, and the vial cannot be replaced. In actual clinical use, the amount of liquid administered is often limited. A bag of liquid needs to be mixed with several different drugs to meet the dosage requirements. The existing mixing cup for replacing vials cannot achieve one bag of liquid corresponding to vials with multiple dosage units or one bag of infusion corresponding to several different vials of drugs. At the same time, the mixing cup cannot replace the vial, causing the vial to be discarded together with the mixing cup before the next vial of drugs can be added, resulting in a huge waste of medical mixing cup consumables.

[0006] Patent application 201811260397.2 discloses a medicine mixing cup with an eccentric needle structure, which includes a medicine mixing card body, a hollow cross needle and a clamping structure. The clamping structure includes a mounting portion and an elastic claw, and the medicine mixing card body includes a plurality of annular cup walls arranged at intervals. The projection of the connecting ends of all elastic claws on the cross needle needle seat along the axial direction forms a first circle, and the projection of the inner wall of all annular cup walls on the cross needle needle seat along the axial direction forms a second circle, and the first circle and the second circle partially overlap. By designing an eccentric structure, the dosing port and the infusion port are separated during operation, and the port is used for a dedicated purpose. When dosing, the infusion port is not exposed to the air, avoiding secondary contamination of the infusion port; when dosing, the infusion port and the dosing port are not in the same tube, and the infusion port is not opened, so when opening the infusion port for infusion, it is not necessary to repeat disinfection, which saves the cost of disinfection and reduces the trouble of nurses' operation, and also greatly improves the safety of clinical drug use.

[0007] However, the needle tip of this hollow cross needle structure is a frustum structure, and its inlet and outlet are both round. Since the needle mouth is relatively small, the inlet and outlet are often blocked by the surface tension of the liquid when the liquid enters and exits, resulting in the inability of the liquid to flow smoothly. In addition, during the mixing process, impurities such as particles and air may be mixed in the liquid and cannot be removed. Moreover, since the inlet and outlet are at the top of the needle, when the liquid is sucked back, under normal conditions, a small amount of liquid will remain in the vial, and the impurity particles in the vial and during the operation will also enter the infusion liquid. Summary of the invention

[0008] The purpose of the present invention is to provide a liquid medicine transfer filter with an eccentric needle and a filtering structure in order to overcome the defects of the above-mentioned prior art.

[0009] The purpose of the present invention can be achieved by the following technical solutions:

[0010] A drug liquid transfer filter with an eccentric needle and a filtering structure comprises a drug mixing card body, a hollow cross needle and a clamping structure. The hollow cross needle comprises a needle seat and a hollow needle. The feature is that the needle openings at both ends of the hollow needle are progressive openings, and reinforcing ribs are provided on the needle seat.

[0011] Furthermore, the progressive opening is an opening whose opening area gradually increases by cutting sideways along the conical surfaces of the needles at both ends. The opening surface of the clamping structure end is an inclined plane, and the opening surface of the drug mixing card body end is a composite surface. The needle with the progressive opening is used to insert the stopper of the infusion soft bag or bottle.

[0012] Furthermore, the angle between the inclined plane and the horizontal plane is 30 to 60 degrees.

[0013] Furthermore, the composite surface is composed of a cylindrical intersecting surface, a wedge surface, a cylindrical intersecting surface and a wedge surface connected in sequence, which form an angle of 15 to 85 degrees with the axis of the hollow needle.

[0014] Furthermore, the vertical length of the composite surface of the progressive opening is 2-5 mm, and the progressive opening is a single or multiple openings cut laterally along the conical surface of the needles at both ends.

[0015] Single or multiple openings cut laterally along the conical surface of the needle at both ends.

[0016] Furthermore, the needle seat is formed by the top of the drug mixing card body and the bottom of the clamping structure matching and clamping together, wherein the top of the drug mixing card body and the bottom edge of the clamping structure are provided with corresponding protrusions and grooves for clamping together.

[0017] Furthermore, an empty groove is provided in the center of the needle seat, and the empty groove can be spherical, hemispherical or other groove-shaped. At least one filter membrane is arranged on the empty groove, and the filter membrane can be arranged on the empty groove or under the empty groove, or at the center of the empty groove, that is, an empty groove can be arranged above and below the filter membrane. The purpose is that the medicine liquid entering from the upper hollow needle can be suspended in the groove and then filtered to avoid overflow of the medicine liquid due to lack of time for filtration, or the medicine liquid flowing out of the upper hollow needle is first filtered by the filter membrane and then enters the empty groove below the filter membrane and flows out from the lower hollow needle.

[0018] Furthermore, an empty groove is provided in the needle seat, and at least one filter membrane is arranged in the empty groove. The empty groove and the filter membrane constitute a filter. When the drug solution passes through the hollow needle, it passes through the filter. The filter is used to filter insoluble particles such as drug crystals, glass fragments, plastic particles and rubber plugs.

[0019] Furthermore, the hollow needle is provided with a filter at the needle seat, and at least one filter membrane is arranged in the filter, and the filter is used to filter insoluble particles such as drug crystals, glass fragments, plastic particles and rubber plugs.

[0020] Furthermore, the thickness specification of the filter membrane is 0.1 to 25 microns.

[0021] Furthermore, the hollow cross needle is arranged at the bottom of the medicine mixing card body and along the axial direction of the medicine mixing card body, and the clamping structure is connected to the bottom of the medicine mixing card body.

[0022] Furthermore, the medicine mixing card body includes a number of medicine mixing claws and anti-slip buckles arranged at intervals, the anti-slip buckles are arranged on the inner wall of the medicine mixing claws and are in the shape of barbs, and the clamping structure includes a number of elastic claws and anti-slip card bodies arranged at intervals, the anti-slip card bodies are arranged on the inner wall of the elastic claws and are in the shape of barbs, and are used to stabilize the connection between the medicine mixing cup and the infusion soft bag.

[0023] The axial center line of the outer walls of the plurality of intervally arranged drug mixing claws coincides with the axial center line of the hollow cross needle and does not coincide with the axial center line of the outer walls of the elastic claws.

[0024] Furthermore, the axial projection of the outer wall of the drug mixing claw on the needle seat is entirely within the axial projection of the outer wall of the elastic claw on the needle seat.

[0025] Furthermore, the free end of at least one elastic claw is inclined toward the outer wall of the elastic claw along the axial center line, and the inclination angle is 5-45 degrees.

[0026] Furthermore, the number of the drug mixing claws is 2 to 6, and the number of the elastic claws is 2 to 6.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The needle openings at both ends of the hollow needle of the present invention are progressive openings. The needle with progressive openings is inserted into the rubber stopper of the mixing cup or the infusion soft bag, which effectively avoids the generation of debris when the needle is inserted, and also avoids the blockage caused by the liquid surface tension, thereby improving the safety of the device and the convenience of use; the composite surface end of the progressive opening, during the process of liquid medicine reabsorption, under the action of the opening, the liquid medicine is completely returned to the infusion bag or bottle, thereby avoiding waste.

[0029] (2) The hollow needle of the present invention is provided with a filter, which can filter out insoluble particles such as drug crystals, glass fragments, plastic particles and rubber plugs in the solution during operation, thereby avoiding secondary damage and improving the safety of drug mixing;

[0030] (3) The present invention ensures the stability of the medicine mixing cup during operation through the clamping structure and the medicine mixing card body, prevents the medicine mixing cup from shaking during operation, and the eccentric structure of the clamping structure makes the application range of the medicine mixing cup wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A stereoscopic view of the lower end of the liquid transfer filter;

[0032] Figure 2 It is a stereoscopic view of the upper end of the liquid transfer filter;

[0033] Figure 3 A diagram of the tip of a hollow needle located at the end of the drug mixing card body;

[0034] Figure 4 is a diagram of the tip of a hollow needle located at the end of a clamping structure;

[0035] Figure 5 It is a three-dimensional picture of the mixed medicine card body;

[0036] Figure 6 It is a three-dimensional diagram of the clamping structure;

[0037] Figure 7 This is the structure diagram of the filtration membrane;

[0038] Figure 8 A top view of the drug transfer filter.

[0039] Description of the numbers in the figure:

[0040] 1. Drug mixing card body, 2. Hollow cross needle, 3. Clamping structure, 11. Drug mixing claw, 21. Needle seat, 22. Hollow needle, 23. Filter membrane, 24. Reinforcement rib, 31. Elastic claw, 32. Anti-slip card body. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0042] Example 1

[0043] A liquid transfer filter with an eccentric needle and a filtering structure, such as Figure 1 As shown, it includes a drug mixing card body 1, a hollow cross needle 2 and a clamping structure 3, wherein the hollow cross needle 2 is arranged at the bottom of the drug mixing card body 1 and is arranged axially along the drug mixing card body 1, and the clamping structure 3 is connected to the bottom of the drug mixing card body 1, wherein the central axis of the clamping structure 3 is parallel to the hollow cross needle 2, forming an eccentric structure. Figure 2 The hollow cross needle 2 includes a needle seat 21 and a hollow needle 22 , and a reinforcing rib 24 is provided on the needle seat 21 .

[0044] The progressive opening is an opening cut laterally along the conical surface of the needles at both ends, and the progressive opening is an opening whose opening area gradually increases by cutting laterally along the conical surface of the needles at both ends. Figure 3As shown, the needle tip of the hollow needle 22 located at one end of the drug mixing card body 1 is cut with a composite surface opening on the basis of the conical tip, and the composite surface is composed of a cylindrical intersecting surface, a wedge surface, a cylindrical intersecting surface and a wedge surface connected in sequence at a certain angle to the axis of the hollow needle 22; Figure 4 The needle tip of the hollow needle 22 at one end of the clamping structure 3 is cut with an inclined plane opening on the basis of the conical tip. The drug card end of the hollow needle 22 is gradually inserted into the cillin bottle to avoid debris, and at the same time, no drug residue is left during reflux. The clamping structure 3 is gradually inserted into the infusion soft bag to avoid debris, and can avoid the liquid surface tension from causing the hollow needle 22 to be blocked. At the same time, the progressive opening composite surface can make all the drug liquid flow back to the infusion bag and bottle, avoiding drug waste and affecting the treatment effect.

[0045] like Figure 5 , Figure 6 and Figure 7 The needle seat 21 is formed by the combination of the protrusions and grooves on the drug mixing card body 1 and the clamping structure 3. An empty groove is provided in the needle seat 21. At least one filter membrane 23 is provided in the empty groove. The empty groove and the filter membrane 23 constitute a filter. When the drug solution passes through the hollow needle, it passes through the filter. The filter is used to filter insoluble particles such as drug crystals, glass fragments, plastic particles and rubber plugs. The thickness specification of the filter membrane 23 is 0.1 to 25 microns.

[0046] like Figure 8 The center line of the outer wall of the three spaced-apart medicine mixing claws along the axial direction coincides with the axial center line of the hollow cross needle and does not coincide with the axial center line of the outer wall of the elastic claw; the axial projection of the outer wall of the medicine mixing claw on the needle seat is entirely within the axial projection of the outer wall of the elastic claw on the needle seat.

[0047] The medicine mixing card body 1 comprises three medicine mixing claws 11 arranged at intervals, and the inner wall of the medicine mixing claws 11 is provided with a barbed anti-slip buckle 12 to ensure the stable connection between the medicine mixing cup and the cillin bottle and avoid shaking;

[0048] The clamping structure 3 includes three elastic claws 31 arranged at intervals, and the anti-slip clamp body 32 is arranged on the inner wall of the elastic claw 31 and is in the shape of a barb, wherein the free end of one of the elastic claws 31 is inclined toward the axial center line of the outer wall of the elastic claw, thereby ensuring a stable connection between the medicine mixing cup and the infusion container and avoiding displacement in the vertical and horizontal directions.

[0049] The eccentric needle structure is suitable for infusions where the liquid passage is not at the center of the infusion cap, such as a double-valve infusion cap. At the same time, it maintains a stable connection during the drug mixing process. The syringe bottle can be taken out of the mixing cup by tilting it at a certain angle. At the same time, the hollow needle is gradually inserted into the rubber stopper of the syringe bottle and the infusion soft bag without generating debris, and the liquid flow remains unobstructed.

[0050] The above describes in detail the more specific embodiments of the present invention. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A drug liquid transfer filter with an eccentric needle and a filtering structure, comprising a drug mixing card body (1), a hollow cross needle (2) and a clamping structure (3), wherein the hollow cross needle (2) comprises a needle seat (21) and a hollow needle (22), characterized in that: The needle openings at both ends of the hollow needle (22) are progressive openings, and a filter is provided at the needle seat (21); The progressive opening is formed by cutting sideways along the conical surfaces of the needles at both ends to form an opening with a gradually increasing opening area. The opening surface of the clamping structure end is an inclined plane, and the opening surface of the drug mixing card body end is a composite surface. The needle with the progressive opening is inserted into the rubber stopper of the infusion soft bag or bottle. The composite surface is composed of a cylindrical intersecting surface, a wedge-shaped surface, a cylindrical intersecting surface and a wedge-shaped surface connected in sequence at an angle of 15 to 85 degrees to the axis of the hollow needle (22); The vertical length of the composite surface of the progressive opening is 2-5 mm, and the progressive opening is a single or multiple openings cut laterally along the conical surface of the needle heads at both ends.

2. A liquid medicine transfer filter with an eccentric needle and a filtering structure according to claim 1, characterized in that: The angle between the inclined plane and the horizontal plane is 30 to 60 degrees.

3. The liquid medicine transfer filter with an eccentric needle and a filtering structure according to claim 1, characterized in that: The needle seat (21) is composed of a top portion of a drug mixing card body (1) and a bottom portion of a clamping structure (3) that are matched and clamped together.

4. The medicine mixing cup with an eccentric needle structure according to claim 3, characterized in that: The center of the needle seat (21) is provided with an empty groove, and at least one filter membrane (23) is provided on the empty groove. The drug solution enters the empty groove through the upper hollow needle, is filtered by the filter membrane (23), and then flows out from the lower hollow needle.

5. The medicine mixing cup with an eccentric needle structure according to claim 4, characterized in that: The thickness specification of the filter membrane (23) is 0.1-25 microns.

6. The liquid medicine transfer filter with an eccentric needle and a filtering structure according to claim 1, characterized in that: The hollow cross needle (2) is arranged at the bottom of the drug mixing card body (1) and along the axial direction of the drug mixing card body (1), and the clamping structure (3) is connected to the bottom of the drug mixing card body (1), wherein the central axis of the clamping structure (3) is parallel to the hollow cross needle (2), forming an eccentric structure.

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