Bone cement monomer equalizer with small structure

Abstract

The utility model discloses a bone cement monomer equalizer with a small structure, which comprises a shell, an equalizer arranged in the shell, a piston sleeve movably arranged in the equalizer, a liquid outlet hole formed in the center of the bottom of the piston sleeve, and a rubber plug movably clamped in the liquid outlet hole, a breaking and filtering assembly which is provided with an ampoule bottle and is not communicated with the external environment is vertically arranged in the piston sleeve in a communicating mode, four liquid collecting pipes are evenly distributed on the bottom wall of the equalizer, the four liquid collecting pipes are all communicated with the equalizer, pistons are movably arranged in the liquid collecting pipes in a sealed mode, drainage pipes are arranged in the pistons, and the drainage pipes are communicated with the liquid collecting pipes. The drainage tube penetrates through the liquid collecting tube and the shell and then extends outwards, a one-way Luer taper is arranged on the drainage tube, and the flow direction of the one-way Luer taper is from the outside to the drainage tube. The utility model has the advantages that the structure is small and exquisite, the production can be reduced, and the production and the use are convenient.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a compact bone cement monomer distributor. Background Technology

[0002] Bone cement is a medical material used in orthopedic surgery, composed of liquid monomers and powder. When mixed in a specific ratio, it is injected into the patient's affected area in a liquid state and then solidifies. To prevent waste of bone cement monomers in ampoules, a negative pressure dispenser with high-precision dispensing capability (publication number CN118615159A) has been commercially available. This dispenser contains a distributor, within which a piston sleeve is movably mounted. A sealing sleeve is fitted onto the piston sleeve. When the piston sleeve moves upwards within the distributor, the volume of the distributor's inner cavity below the piston sleeve matches the volume of the bone cement monomers in the ampoule. A liquid outlet is located at the bottom of the piston sleeve, within which a rubber plug is movably mounted to seal the outlet. A vertically connected, broken filter assembly, which houses the ampoule but is not connected to the external environment, is also located within the piston sleeve. A vent hole aligned with the rubber plug is located at the center of the bottom wall of the equalizer. A vacuum check valve is installed on the vent hole. Four dispensing holes are evenly distributed around the bottom wall of the equalizer. Rubber pins are used to seal the dispensing holes. A collection tube is installed on the dispensing holes. A dispensing hose is installed on the bottom wall of the collection tube. The dispensing hose is bent upwards and connected to a three-way pipe on the top wall of the housing. A one-way Luer connector and a return air pipe are installed on the three-way pipe. The return air pipe is connected to the return air hole on the side wall of the syringe. The syringe is fixed to the top wall of the housing. A piston rod is installed in the syringe with a movable seal. A connecting pipe is installed on the bottom wall of the syringe. The connecting pipe is connected to the air inlet on the side wall of the collection tube. A check valve is installed in the air inlet. When placing the ampoule into the broken filter assembly, the air in the distributor needs to be purged through the vacuum check valve. During the dispensing process, when the bone cement monomers enter the collection tube, some of the gas in the outlet tubing needs to be squeezed into the syringe tube for extraction. Only then can the piston rod in the syringe tube be pressed to release the bone cement monomers from the one-way Luer connector into the stirring syringe for mixing with the bone cement powder.

[0003] Because it is equipped with a vacuum check valve and syringe tube, the overall size of the housing is large, the amount of material used is increased, and the production cost is high. During production and assembly, it is necessary to seal the dispensing hole with rubber nails, which are small in size and difficult to assemble, thus reducing production efficiency. In use, it is necessary to press the piston rod in the syringe tube to extract the liquid, which is cumbersome and not simple. Utility Model Content

[0004] The purpose of this utility model is to provide a simplified version of the negative pressure distributor with high-precision dispensing of bone cement monomers published in CN118615159A, resulting in a compact bone cement monomer dispenser that is small in size, easy to assemble, and convenient to use.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a compact bone cement monomer distributor, comprising: a shell, a distributor disposed within the shell, a piston sleeve movably disposed within the distributor, a sealing sleeve disposed on the piston sleeve, wherein when the piston sleeve moves upward into position within the distributor, the volume of the inner cavity of the distributor located below the piston sleeve matches the volume of the bone cement monomer in the ampoule, a liquid outlet is disposed at the center of the bottom of the piston sleeve, a rubber plug is movably secured in the liquid outlet, a broken filter assembly for installing the ampoule and not connected to the external environment is vertically connected within the piston sleeve, four liquid collection tubes are evenly distributed on the bottom wall of the distributor, all four liquid collection tubes are connected to the distributor, a piston is movably and sealed within the liquid collection tube, a drainage tube is disposed within the piston, the drainage tube extends outward after passing through the liquid collection tube and the shell, a one-way Luer connector is disposed on the drainage tube, the flow direction of the one-way Luer connector is from the outside to the drainage tube.

[0006] Furthermore, in the aforementioned compact bone cement unit distributor, the outlet hole is shaped like a plum blossom, the inner wall of the outlet hole abuts against the rubber plug, an inner conical wall is provided in the outlet hole, a protruding ring is provided at the upper end of the rubber plug, an outer conical wall that cooperates with the inner conical wall is provided at the lower end of the rubber plug, a shoulder is provided on the outer conical wall, the shoulder abuts against the outer bottom wall of the piston sleeve and is in contact with the sealing rubber sleeve.

[0007] Furthermore, in the aforementioned compact bone cement unit distributor, an inverted conical fluid collection groove is provided on the upper end wall of the piston, and a drainage pipe is connected to the fluid collection groove, with the end of the drainage pipe flush with the inner bottom wall of the fluid collection groove.

[0008] Furthermore, in the aforementioned compact bone cement monomer distributor, four dispensing holes are provided on the bottom wall of the distributor, each corresponding to one of the four collecting tubes, and the diameter of the dispensing holes is smaller than the outer diameter of the piston.

[0009] Furthermore, in the aforementioned compact bone cement monomer distributor, four identical flow channel grooves are recessed on the inner bottom wall of the distributor, with the dispensing hole located in the flow channel groove. Four drainage grooves are provided at the center of the inner bottom wall of the distributor, with each drainage groove connected to one flow channel groove.

[0010] Furthermore, in the aforementioned compact bone cement monomer distributor, a limiting ring is provided at the bottom of the collection tube.

[0011] Furthermore, in the aforementioned compact bone cement unit divider, several reinforcing ribs are evenly distributed on the inner wall of the shell, and a base support is provided at the bottom of the shell.

[0012] The advantages of this utility model are as follows: Compared with the negative pressure distributor with high-precision dispensing of bone cement monomers disclosed in CN118615159A, it does not require a vacuum check valve to evacuate the distributor. During the production process, the air in the distributor can be discharged through the drainage pipe to form a vacuum simply by pressing down the piston sleeve. Then, a one-way Luer connector is set on the drainage pipe to maintain a vacuum between the piston sleeve and the distributor. It also does not require a syringe to pressurize and push the bone cement monomers when extracting them. When extracting the bone cement monomers, the piston sleeve is pulled up to create a gap between the liquid outlet in the piston sleeve and the rubber plug, thus breaking the vacuum in the collection pipe and allowing for normal extraction. Without the vacuum check valve and syringe, the volume of the entire shell is reduced, which reduces material usage and production costs. Moreover, the operation process is simplified because the piston rod in the syringe does not need to be pressed during extraction. The assembly difficulty is reduced because there is no need to set a sealing rubber pin in the dispensing hole. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a compact bone cement monomer distributor according to the present invention.

[0014] Figure 2 yes Figure 1 A schematic diagram of the central cross-section structure.

[0015] Figure 3 yes Figure 1 Schematic diagram of the eccentric cross-section structure.

[0016] Figure 4 yes Figure 2 A schematic diagram showing the connection between the middle shell and the equalizer.

[0017] Figure 5 yes Figure 2 A schematic diagram of the piston sleeve. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and preferred embodiments.

[0019] like Figures 1-5As shown, the present invention discloses a compact bone cement unit distributor, comprising: a shell 1, with several reinforcing ribs 11 evenly distributed on the inner wall of the shell 1 to improve its strength; a base support 12 at the bottom of the shell 1 to ensure stable placement; a distributor 2 disposed within the shell 1; a piston sleeve 21 movably disposed within the distributor 2; and a sealing sleeve 211 disposed on the piston sleeve 21. The piston sleeve 21 is sealed to the distributor 2 via the sealing sleeve 211. The positioning structure between the piston sleeve 21 and the distributor 2 in this embodiment is similar to that described in publication number CN118615159A. The positioning structure between the piston sleeve and the equalizer in the negative pressure dispenser capable of high-precision dispensing of bone cement monomers is the same. A locking cap 22 is threaded onto the outer wall of the equalizer 2. The end cap on the locking cap 22 covers the equalizer 2. When the piston sleeve 21 moves upward in the equalizer 2 and abuts against the end cap of the locking cap 22, the piston sleeve 21 moves upward into place. At this time, the inner volume of the equalizer 2 located below the piston sleeve 21 matches the volume of the bone cement monomer in the ampoule. That is, when the piston sleeve 21 moves upward into place, the monomer in the ampoule can fill the inner cavity of the equalizer 2 located below the piston sleeve 21.

[0020] A liquid outlet hole 212 is provided at the center of the bottom of the piston sleeve 21. A rubber plug 23 is movably fitted in the liquid outlet hole 212. The liquid outlet hole 212 is shaped like a plum blossom. The inner wall of the liquid outlet hole 212 abuts against the rubber plug 23. An inner conical wall is provided in the liquid outlet hole 212. A protruding ring 231 is provided at the upper end of the rubber plug 23. An outer conical wall that mates with the inner conical wall extends from the lower end of the rubber plug 23. A shoulder 232 extends from the outer conical wall. The shoulder 232 abuts against the outer bottom wall of the piston sleeve 21 and is in contact with the sealing rubber sleeve 211. The piston sleeve 21 is vertically connected. The embodiment includes a breakable filter assembly 3 that houses ampoules and is not connected to the external environment. This breakable filter assembly 3 is structurally similar to the breakable filter assembly in the negative pressure distributor with high-precision dispensing of bone cement monomers disclosed in CN118615159A. The breakable filter assembly 3 includes a lower sleeve 31, a rotating sleeve 32, and an upper sleeve 33. The lower sleeve 31 is inserted into the piston sleeve 21. The bottom of the rotating sleeve 32 is connected to the top of the lower sleeve 31. A filter screen 34 is provided between the rotating sleeve 32 and the lower sleeve 31. An installation hole is provided at the top of the rotating sleeve 32. The bottom of the upper sleeve 33... The upper sleeve 33 is connected to the top of the rotating sleeve 32 and communicates with the mounting hole of the rotating sleeve 32. A cap 321 is rotatably mounted at both ends of the rotating sleeve 32. The cap 321 is in sealing contact with the rotating sleeve 32 via a sealing ring. A knob 322 is located between the two caps 321. A through hole 323 aligned vertically with the mounting hole is opened in the knob 322. A sealing cap 35 is threaded onto the top of the upper sleeve 33. When installing the ampoule, the sealing cap 35 is unscrewed, and the cap 321 is rotated to align the through hole 323 on the knob 322 with the mounting hole 331. Then, the ampoule is inserted with the bottle head facing down. The ampoule head passes through the mounting hole of the rotating sleeve 32 into the straight hole 323 in the upper sleeve 33. Then, the sealing cap 35 is screwed back onto the upper sleeve 33. At this time, the bottom of the ampoule rests against the sealing cap 35, and the neck of the ampoule rests against the mounting hole. When it is necessary to break the ampoule, simply rotate the cap 321, and the knob 322 will break the neck of the ampoule. The ampoule head falls onto the filter screen 34, and the broken part of the ampoule head is tilted downwards. The ampoule body and the ampoule head will flow through the filter screen 34 into the lower sleeve 31 and the piston sleeve 21.

[0021] Four identical flow channel grooves 24 are recessed on the inner bottom wall of the equalizer 2, and liquid dispensing holes 241 are provided in the flow channel grooves 24. Four guide grooves 25 are provided at the center of the inner bottom wall of the equalizer 2, and each guide groove 25 is connected to one flow channel groove 24. Four liquid collecting pipes 4 are evenly distributed on the bottom wall of the equalizer 2, and the four liquid collecting pipes 4 are respectively connected to the four liquid dispensing holes 241. A piston 41 is movably sealed in the liquid collecting pipe 4, and the outer diameter of the piston 41 is larger than that of the liquid dispensing hole 241. The diameter of the orifice is such that a limiting ring 44 is provided at the bottom of the liquid collecting pipe 4, an inverted conical liquid collecting groove 42 is provided on the upper end wall of the piston 41, a drainage pipe 43 is provided in the piston 41, the drainage pipe 43 is connected to the liquid collecting groove 42, the upper end of the drainage pipe 43 is flush with the inner bottom wall of the liquid collecting groove 42, the drainage pipe 43 extends outward after passing through the liquid collecting pipe 4 and the housing 1, a one-way Luer connector 5 is provided on the drainage pipe 43, and the flow direction of the one-way Luer connector 5 is from the outside to the drainage pipe 43.

[0022] During production, when it is necessary to vent the air from the equalizer 2, simply push the piston sleeve 21 downward by breaking the filter assembly 3. The piston sleeve 21 moves the rubber plug 23 downward together, and the air in the equalizer 2 is directly discharged outward through the liquid distribution hole 241, the liquid collection tank 42 and the drainage pipe 43 until the sealing rubber sleeve 211 on the piston sleeve 21 seals the liquid distribution hole 241. At the same time, the rubber plug 23 also fits against the inner bottom wall of the equalizer 2. At the same time, the rubber plug 23 seals the liquid outlet hole 212 on the piston sleeve 21. Then, the one-way Luer connector 5 is fixed on the drainage pipe 43. Since there is air in the drainage pipe 43, the one-way Luer connector 5 can prevent outside air from entering the drainage pipe 43. At this time, there is a vacuum between the equalizer 2 and the piston sleeve 21. After the ampoule is placed in the broken filter assembly 3 and sterilized, it can be shipped out.

[0023] In use, first break the ampoule by breaking the filter assembly 3. After the bone cement monomer in the ampoule flows into the piston sleeve 21, hold the broken filter assembly 3 and lift the piston sleeve 21 upwards. During this process, a gap appears between the liquid outlet 212 and the rubber plug 23 in the piston sleeve 21, and the bone cement monomer in the piston sleeve 21 flows into the distributor 2 through the gap. When the piston sleeve 21 moves upwards to its final position, all the bone cement monomer in the piston sleeve 21 flows into the distributor 2, and there is no excess air in the distributor 2 located below the piston sleeve 21. Because bone cement monomers flow into the distributor 2 in a timely manner, the negative pressure generated when the piston sleeve 21 moves upward will not act on the one-way Luer connector 5 through the drainage tube 43, thus preventing the one-way Luer connector 5 from automatically opening and disrupting the negative pressure state in the distributor 2. When the piston sleeve 21 is pressed down, the rubber plug 23 re-seals the outlet hole 212 of the piston sleeve 21, and then pushes the bone cement monomers downward together. The bone cement monomers are evenly distributed into the four collection tubes 4 through the four distribution holes 241. Due to the sealing effect of the one-way Luer connector 5 on the drainage tube 43, the bone cement monomers flow into the four collection tubes 4. The bone cement monomers entering the collection tube 4 cannot be discharged through the drainage tube 43. The bone cement monomers in the collection tube 4 can only push downwards against the piston 41 in the collection tube 4. As the amount of bone cement monomers in the distributor 2 gradually decreases, a small amount of bone cement monomers can be evenly distributed into the distribution holes 241 of the four flow channels 24 through the four drainage grooves 25. When the piston sleeve 21 descends to fit against the inner bottom wall of the distributor 2, the bone cement monomers in the distributor 2 are evenly distributed into the four collection tubes 4. When extraction is required, hold the broken filter assembly 3 and lift the piston sleeve 21 upwards. Simply raise the pressure to create a gap between the plug 23 and the outlet hole 212. At this point, the collection tube 4 and the broken filter assembly 3 are connected, and the bone cement monomer in the collection tube 4 is no longer in a vacuum state. Then, insert the stirring syringe into the one-way Luer connector 5 and open the one-way Luer connector 5 to extract the cement. Since the collection groove 42 on the top wall of the piston 41 is inverted conical in shape, and the end of the drainage tube 43 is flush with the inner bottom wall of the collection groove 42, all the bone cement monomer in the collection tube 4 can flow into the drainage tube 43 and be extracted by the stirring syringe.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A compact bone cement monomer aliquotter comprising: The shell is provided with an aliquotter, a piston sleeve movably arranged in the aliquotter, a sealing rubber sleeve arranged on the piston sleeve, the volume of the inner cavity of the aliquotter below the piston sleeve is matched with the volume of the bone cement monomer in the ampoule when the piston sleeve is run up to position in the aliquotter, a liquid outlet hole is arranged at the center of the bottom of the piston sleeve, a rubber plug head is movably arranged in the liquid outlet hole, a broken filter assembly is vertically and communicatively arranged in the piston sleeve and is not communicated with the outside environment, characterized in that four liquid collecting pipes are uniformly distributed on the bottom wall of the aliquotter, the four liquid collecting pipes are communicated with the aliquotter, a piston is movably and sealingly arranged in the liquid collecting pipe, a drainage pipe is arranged in the piston, the drainage pipe extends outwards after passing through the liquid collecting pipe and the shell, a one-way luer joint is arranged on the drainage pipe, and the flow direction of the one-way luer joint is from the outside to the drainage pipe.

2. A compact bone cement monomer aliquot device according to claim 1, wherein: The liquid outlet hole is in the shape of plum blossom, the inner side wall of the liquid outlet hole abuts against the rubber plug head, an inner tapered wall is arranged in the liquid outlet hole, a convex ring is protrusively arranged at the upper end of the rubber plug head, an outer tapered wall matched with the inner tapered wall is extendingly arranged at the lower end of the rubber plug head, a convex shoulder is extendingly arranged on the outer tapered wall, the convex shoulder abuts against the outer bottom wall of the piston sleeve and is in close contact with the sealing rubber sleeve.

3. A compact bone cement monomer aliquoter according to claim 1, wherein: A reverse tapered liquid collecting groove is arranged on the upper end wall of the piston, the drainage pipe is communicated with the liquid collecting groove, and the end of the drainage pipe is flush with the inner bottom wall of the liquid collecting groove.

4. A compact bone cement monomer aliquot device according to claim 1, wherein: Four liquid distribution holes are arranged on the bottom wall of the aliquotter, the four liquid distribution holes are one-to-one corresponding to the four liquid collecting pipes, and the diameter of the liquid distribution hole is smaller than the outer diameter of the piston.

5. A compact bone cement monomer aliquot device according to claim 4, wherein: Four flow channel grooves of the same size are recessedly arranged on the inner bottom wall of the aliquotter, the liquid distribution hole is located in the flow channel groove, and four drainage grooves are arranged at the center of the inner bottom wall of the aliquotter, each drainage groove being communicated with a flow channel groove.

6. A compact bone cement monomer aliquot device according to claim 1, wherein: A limiting ring is arranged at the bottom of the liquid collecting pipe.

7. A compact bone cement monomer aliquot device according to claim 1, wherein: A plurality of reinforcing ribs are uniformly distributed on the inner side wall of the shell, and a bottom support is arranged at the bottom of the shell.

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