CN-121754786-B - Prefilled type wash pipe syringe with filter, anticreep cap and anti-secondary use

CN121754786BCN 121754786 BCN121754786 BCN 121754786BCN-121754786-B

Abstract

The invention discloses a prefilled syringe with filtering, anti-drop caps and secondary use prevention, and belongs to the field of medical appliances. The prefilled syringe includes a core rod, a piston, a sleeve, and a protective cap. The top of the sleeve is provided with a conical head with a clamping ring, the outer side of the conical head is provided with a fixed cylinder thread and a fixed ring, and the protective cap consists of an inner ring with a protective cap thread and a filter element and an outer ring with a detachable locking ring. The protection cap is prevented from falling off during high-pressure sterilization by the cooperation of the fixing cylinder threads and the protection cap threads and the cooperation of the fixing cylinder fixing ring and the protection cap locking ring. The locking ring is separated from the outer ring of the protective cap and stays at the fixing ring when the protective cap is pulled out, so that the secondary use is prevented. The injection is filtered by embedding the filter element into the conical head clasp. The invention can avoid the falling off of the protective cap during sterilization and the secondary misuse after use, and simultaneously filters the impurities of the injection, thereby improving the use safety and reliability.

Inventors

ZHANG HAIJUN
Lu tianheng
YUAN KUNSHAN
TAI ZHIXIN

Assignees

山东百多安医疗器械股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260303

Claims (8)

1. The prefilled type flushing syringe is characterized by comprising a core rod, a piston, a sleeve and a protective cap, wherein the piston is assembled in the sleeve, one end of the core rod is fixedly connected with the piston, a conical head used for connecting a conduit connecting piece is integrally formed at the top of the sleeve, a clamping ring is arranged in the circumferential direction of the inner wall of the conical head, the clamping ring of the inner wall of the conical head is of a convex or concave annular structure, the number of the clamping rings is 1-3, a fixing cylinder is coaxially fixed on the outer side of the conical head of the sleeve, a fixing cylinder screw thread is arranged on the inner wall of the fixing cylinder, a fixing ring and a fixing screw tooth are arranged in the circumferential direction of the outer wall of the fixing cylinder, the protective cap consists of an inner ring of the protective cap and an outer ring, the outer ring of the protective cap is provided with the protective cap screw thread matched with the fixing cylinder screw thread, the inner ring of the protective cap is nested with a filter element, the filter element has a diameter of 0.22-5 mu m, the filter element can be separated from the inner ring of the protective cap, the filter element is provided with an annular clamping groove or an annular bulge matched with the inner wall of the conical head, the annular bulge is matched with the inner wall of the clamping ring, the inner ring is matched with the clamping ring, the inner ring of the protective cap is enabled to be separated from the inner ring of the protective cap by welding, the inner ring is not matched with the inner ring of the protective cap, and the inner ring is directly fixed with the inner ring by the inner ring of the protective cap by the fixing ring.
2. The prefilled syringe with filtration, anti-drop cap and anti-secondary use according to claim 1, wherein the fixed barrel and the sleeve are integrally injection molded, the raw material is one or more of polypropylene (PP), polyethylene (PE) or cyclic polyolefin (COC), the piston material is one or more of polyisoprene rubber, butyl rubber, halogenated butyl rubber, silicone rubber and ethylene propylene diene monomer rubber, and the core rod and the protective cap raw material are one or more of PP, PE or COC.
3. The prefilled syringe of claim 1, wherein said filter element raw material is one or more of polyethersulfone, nylon, or mixed cellulose ester.
4. The prefilled syringe of claim 1, wherein the thread pitch of the protective cap thread and the fixed barrel thread is 0.5-1mm and the thread mating length is 5-8mm.
5. The prefilled syringe of claim 1, wherein the outer wall of the outer ring of the protective cap is provided with anti-slip lines, wherein the anti-slip lines are one of diamond lines, bar lines or grid lines.
6. A prefilled syringe with filter, anti-slip cap and anti-secondary use as claimed in claim 1, wherein said cartridge outer wall retaining ring is of convex or concave design, said retaining screw location being either on or under the retaining ring.
7. The prefilled syringe of claim 1, wherein the number of frangible points is 2-10, and the frangible points are uniformly distributed along the circumferential direction of the mating surface of the outer ring of the protective cap and the locking ring, and the breaking strength of the frangible points is smaller than the screw connection strength between the inner ring of the protective cap and the fixed barrel.
8. The prefilled syringe of claim 1, wherein the locking screw and the fixing screw are engaged with each other, the locking screw is slidable relative to the fixing screw during screwing the protective cap, and the locking screw and the fixing screw are locked during unscrewing the protective cap, thereby preventing the locking ring from rotating with the protective cap and disengaging the locking ring from the protective cap.

Description

Prefilled type wash pipe syringe with filter, anticreep cap and anti-secondary use Technical Field The invention belongs to the field of medical appliances, and particularly relates to a prefilled syringe with a filter, an anti-drop cap and a secondary use prevention function. Background In the medical field, prefilled syringe is widely used for various catheter flushing operations. However, the existing prefilled syringe has a number of problems: 1. The problem that the protective cap is easy to fall off is that the protective cap and the sleeve cone head of the existing injector are mostly in a simple buckle or interference fit structure, and the protective cap and the cone head are easy to fall off due to the influence of temperature change, pressure impact and thermal expansion and cold contraction of materials in the high-pressure sterilization process of products. The protection cap falls off and not only can lead to the flushing fluid to pollute, can also make the conical head expose in external environment, increases microorganism pollution risk, seriously influences product quality and safety in utilization. 2. The self-destruction recognition function is lacking, and in clinical use, partial syringes have no obvious use trace due to appearance, and the situation that the used syringes are mistakenly taken for secondary operation can occur. The prior art does not design an effective self-destruction or use state identification structure, can not judge whether the injector is used or not through visual observation, brings potential safety hazards to medical operation, and can possibly cause medical accidents such as cross infection and the like. 3. The injection liquid has the advantages that although part of the injector is internally provided with the filtering structure, the existing filtering structure is fixed in the conical head, displacement and blockage are easy to occur in the process of assembling or using the injector, the liquid filling efficiency into the injector sleeve in the production process is reduced, in addition, the part of the filtering structure and the protective cap are integrally designed, the filtering structure is removed along with the protective cap when the protective cap is pulled out, the filtering effect cannot be continuously exerted in the injection liquid conveying process, micro particles (such as rubber fragments and liquid medicine precipitates) or microorganisms possibly existing in the injection liquid are difficult to effectively intercept, and the occurrence probability of adverse reaction of patient transfusion is increased. Therefore, it is important to develop a prefilled syringe that can solve the above problems. In recent years, many significant searches have been conducted in the development of prefilled syringe injectors. The patent 2013101146913 discloses a safe pre-filling type flushing pipe injector, which is characterized in that at least one protective barrier is arranged on a channel of the outer surface of a conical head communicated with the outside, the conical head part which is in direct contact with a connecting piece during use is fully protected to avoid infection caused by conical head pollution, a locking cap adopts an inner ring and outer ring structure, the outer ring extends downwards to shield the top surface of a fixed cylinder to protect cap threads which possibly contact with liquid, the pollution risk is reduced, the locking cap is increased in the outer ring structure, the diameter of the cap is large, the screwing is more convenient and labor-saving, the outer ring of the locking cap can be used as an acting part during screwing, the length of the cap part for screwing in the prior art is shortened, and packaging materials are saved. However, the patent fails to prevent the problem of the protective cap falling off during autoclaving. Patent 2024112479330 discloses a prefilled syringe designed to incorporate a filter buffer behind the plunger to form a buffer cavity. In the process of freezing and redissolution, the gas in the buffer cavity can be slowly exchanged with the outside through the filtering holes with the aperture of only 0.22um until the pressure balance is realized. The process can slow down the influence of pressure change caused by rapid temperature change of the medicament and the plunger, and avoids the condition that the plunger is displaced due to rapid pressure change in the prior art, thereby avoiding medicament pollution caused by sealing failure. The filter holes smaller than or equal to 0.22um not only bear the gas exchange function of buffering pressure change, but also can filter air entering the buffer cavity, thereby preventing particles and microorganisms from entering the buffer cavity, and the buffer cavity can always keep a sterile and pure state, so that even if an unexpected plunger is displaced due to pressure change, no pollution is caused to the medicament. However, the filter buffer i