CN114748734B

CN114748734B - Precise filtering injector

Info

Publication number: CN114748734B
Application number: CN202210311904.0A
Authority: CN
Inventors: 李开雄; 李晓燕
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2024-06-11
Anticipated expiration: 2042-03-28
Also published as: CN114748734A

Abstract

The invention discloses a precise filtering injector, which comprises an outer sleeve and a core rod, wherein the top of the core rod is provided with a piston, a joint of the outer sleeve is connected with a detachable needle seat, a needle tube is arranged on the needle seat, the top of an inner cavity of the needle seat is provided with a filtering chamber communicated with the needle tube, a limit ring is arranged below the filtering chamber in the inner cavity of the needle seat, a diaphragm chamber is formed between the limit ring and the filtering chamber, a filtering diaphragm is arranged in the diaphragm chamber, a plurality of grooves are formed in the side wall of the top of the inner cavity of the needle seat, and the grooves are matched with the limit ring to form a plurality of liquid inlet channels communicated with the filtering chamber and the joint; when extracting or injecting the liquid medicine, the liquid medicine can drive the filter membrane to open the liquid inlet channel or close the filter chamber. The invention skillfully utilizes the space of the inner cavity of the needle seat to form a liquid inlet channel, a membrane chamber and a filter chamber, skillfully utilizes the filter membrane as a valve to open the liquid inlet channel and close the filter chamber, and realizes the rapid extraction of liquid medicine and the filtration of the liquid medicine during injection.

Description

Precise filtering injector

Technical Field

The invention relates to the technical field of medical instruments, in particular to a precise filtering syringe.

Background

At present, the syringe used clinically is basically a common syringe, no medicine liquid filtering function is provided, the piston of the common syringe is basically a cylinder and cone top structure, thus leading to a certain residual quantity in the inner cavity of the joint of the syringe and the inner cavity of the needle seat, the syringe is determined to realize the accurate filtering of medicine liquid due to the structural characteristics, the design difficulty is much larger than that of the accurate filtering transfusion syringe, the medicine liquid of the transfusion syringe is in one-way flow, the medicine liquid of the syringe needs to flow bidirectionally, so that a double-chamber design is adopted, namely, a liquid inlet chamber and a filtering chamber, the membrane is fixed, and the piston is even pushed to the bottom, even if being far away from the piston, the medicine liquid in the cavities cannot be utilized, thus the residual quantity of the medicine liquid is increased, the medicine resource is wasted, and adverse effect is caused to the environment. The front end of the filter body is a conical end used for connecting a needle head, and the rear end of the filter body is a filter end used for connecting a needle head seat of the injection cylinder; the filter is characterized in that a liquid channel, at least one liquid inlet channel for one-way liquid suction and at least one liquid outlet channel for one-way liquid discharge are arranged in the filter body, one end of the liquid channel is communicated with the liquid inlet channel and the liquid outlet channel, the liquid channel is arranged along the center of the conical end, and the other ends of the liquid inlet channel and the liquid outlet channel are communicated with the inner cavity of the filtering end; the liquid inlet channel and the liquid outlet channel are internally provided with one-way valves, and one end of the liquid outlet channel, which is close to the filtering end, is provided with a filtering membrane. In addition, the patent specification with the bulletin number of CN208958996U discloses a bidirectional precise filtration injection needle which comprises a protective sleeve, a needle tube seat and a base, wherein a circular gasket is arranged in the middle of the inward end of the needle tube seat, a plurality of through holes are formed in the circular gasket, the circular gasket faces away from one end of the needle tube seat, a duck tongue silica gel piece is arranged at the upper end face of the duck tongue silica gel piece, an open slot is formed in the lower end face of the duck tongue silica gel piece, a precise filtration membrane is arranged at the lower end face of the duck tongue silica gel piece, the base is of a hollow structure and comprises an inward end connected with the needle tube seat and an outward end connected with an injector, a cylinder is arranged at the inward end, and two uniformly symmetrical liquid passing holes are formed in the cylinder. The two schemes have the advantages of more accessories, too complex structure, low production efficiency, higher cost and higher selling price, so that the acceptance degree is low in the market at present, and a product with high cost performance is expected in the market.

The prior common injector has only the scale marks printed on the outer sleeve, when the color of the liquid medicine is darker, the scale marks on the outer sleeve are unclear, the color of the outer sleeve of the light-resistant injector is darker, and when the color of the liquid medicine is darker, the scale marks on the outer sleeve are unclear, so that the dosage is inaccurate, and the curative effect is affected.

Disclosure of Invention

The invention aims to provide a precise filtering injector, wherein a filtering chamber adopts a single-chamber design, the structure is simple, and the purpose of filtering liquid medicine can be realized without adding too many accessories.

The utility model provides a precision filtration syringe, includes overcoat and core bar, the top of core bar is provided with the piston, be connected with detachable needle file on the joint of overcoat, install the needle tubing on the needle file, the oral area edge of overcoat afterbody is provided with the turn-up, the inner chamber top of needle file be provided with the communicating filter chamber of needle tubing, needle file inner chamber be located the filter chamber below is provided with the spacing collar, form the diaphragm room between spacing collar and the filter chamber, be provided with the filtration membrane in the diaphragm room, a plurality of recesses have been seted up to the inner chamber top lateral wall of needle file, the recess cooperates with the spacing collar and forms many intercommunication the filter chamber with the feed liquor passageway of joint; when extracting or injecting the liquid medicine, the liquid medicine can drive the filter membrane to open the liquid inlet channel or close the filter chamber.

The scheme utilizes the internal space of the needle seat, and is provided with a liquid inlet channel, a diaphragm chamber and a filter chamber, and the liquid inlet channel, the diaphragm chamber and the filter chamber are of an integrated structure, and the diaphragm chamber and the liquid inlet channel are formed without additionally manufacturing the accessories and only additionally arranging a limit ring; meanwhile, the filter membrane is skillfully used as a valve, the liquid inlet channel is opened and the filter chamber is closed, and the liquid medicine is filtered by the filter membrane under certain conditions and time difference, so that the liquid medicine enters the liquid inlet channel without being filtered and flows into the outer sleeve to finish the extraction of the liquid medicine, and meanwhile, the filtering operation is ensured to be finished during the injection of the liquid medicine.

Preferably, the filter chamber is provided with a rib for supporting the filter membrane.

Preferably, the membrane chamber has a height exceeding twice the thickness of the filter membrane.

Preferably, the piston has a projection that extends into the adapter lumen and the hub lumen.

Further preferably, the core bar is provided with an outer convex clamping shoulder which can be propped against the curled edge to automatically position the 0 scale.

Preferably, the top of the core rod is provided with an extension part which can extend into the inner cavity of the joint and the inner cavity of the needle seat.

Further preferably, the extension part is provided with an inclined stop shoulder which can be attached to the top of the inner cavity of the outer sleeve to automatically position the scale 0.

Preferably, a first scale line for displaying the volume of the liquid in the jacket is arranged on the jacket; the core bar is provided with a second scale mark for displaying the volume of liquid in the jacket and a number matched with the corresponding second scale mark.

Further preferably, the second scale mark is a notch bar-shaped hollow scale mark, an inner hollow bar-shaped scale mark or a round hole-shaped hollow scale mark.

Further preferably, the number is concave, convex or hollowed.

The invention has the beneficial effects that:

(1) Through utilizing the space in needle file inner chamber, ingenious inlet channel, diaphragm room and the filter chamber of having set up, ingenious utilization filters the diaphragm and as the valve, open inlet channel and close the filter chamber, can realize the filtration when the quick extraction of liquid medicine and liquid medicine injection.

(2) The protruding part is arranged on the piston or the extending part is arranged on the core rod, so that the residual quantity of the liquid medicine is effectively reduced.

(3) Through setting up 0 scale automatic positioning structure, prevent effectively that the back blood phenomenon after the injection from ending.

(4) Through setting up reverse measurement scale mark, effectively make up the not clear shortcoming of forward measurement scale mark when the liquid medicine colour is darker, can also utilize reverse measurement scale mark to realize fixed position quantitative injection.

Drawings

Fig. 1 is a schematic view (with notched bar-shaped hollowed scale marks) of a liquid inlet channel after opening during liquid medicine extraction;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view of the liquid medicine injection after the liquid inlet channel is closed;

FIG. 4 is an enlarged view of part B of FIG. 3;

FIG. 5 is a schematic view of the needle hub cutting across the fluid inlet channel;

FIG. 6 is a schematic cross-sectional view of a cross-shaped fascia;

FIG. 7 is a schematic view of a Y-shaped fascia cross section;

FIG. 8 is a schematic view of a section of a cylindrical tendon;

FIG. 9 is a schematic view of an inner hollowed-out bar-shaped scale mark;

FIG. 10 is a schematic view of round hole-shaped hollowed-out graduation marks;

FIG. 11 is an assembled schematic view of an integral core rod with an extension;

FIG. 12 shows a small steel tube for positioning and quantitative injection.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1-5, a precise filtering injector comprises an outer sleeve 1 and a core rod 2, wherein a piston 3 is arranged at the top of the core rod 2, and the piston 3 is in sealing contact with the inner wall of the outer sleeve 1 so as to realize the sliding of the core rod 2 in the outer sleeve 1; the edge of the opening part of the tail part of the outer sleeve 1 is provided with a curled edge 11, a detachable needle seat 4 is connected with a joint 12 of the outer sleeve 1, and a needle tube 5 is glued on the needle seat 4. Wherein, the core bar 2 is composed of four blades and the section is in a cross shape.

The top of the inner cavity of the needle seat 4 is provided with a filtering chamber 41, the filtering chamber 41 is communicated with the needle tube 5, and a limiting ring 42 is arranged below the filtering chamber 41 in the inner cavity of the needle seat 4; in this embodiment, the stop collar 42 is specifically clamped on the side wall of the inner cavity of the needle stand 4, specifically, an annular concave surface is provided on the side wall of the inner cavity of the needle stand 4, the stop collar 42 is in interference fit with the concave surface, in addition, the center of the stop collar 42 is hollow for the circulation of liquid medicine during liquid injection; a membrane chamber 43 is formed between the limit ring 42 and the filter chamber 41, a filter membrane 44 is arranged in the membrane chamber 43, a plurality of grooves 45 are formed in the side wall of the top of the inner cavity of the needle seat 4, the grooves 45 are particularly distributed on the side wall of the top of the inner cavity of the needle seat 4 by taking the axis of the needle seat 4 as a central array, the grooves 45 and the limit ring 42 are matched to form a plurality of liquid inlet channels 46, in the embodiment, the grooves 45 are four, namely, the grooves 45 and the limit ring 42 are matched to form four liquid inlet channels 46, the liquid inlet channels 46 are communicated with the filter chamber 41 and the connector 12, and the filter chamber 41, the membrane chamber 43, the liquid inlet channels 46 and the inner cavity of the connector 12 form liquid channels during liquid suction. In order to facilitate the provision of the recess 45 (the liquid inlet channel 46), the outer diameter of the middle upper portion of the needle holder 4 is appropriately increased, that is, the wall thickness of the middle upper portion of the inner cavity of the needle holder 4 is increased.

In this embodiment, the filter membrane 44 is a liquid medicine filter membrane with relatively high strength, such as PP membrane, PES coating membrane, etc. The thickness of the filter membrane 44 is 0.3-0.5 mm, and in addition, the height of the membrane chamber 43 exceeds twice the thickness of the filter membrane 44, and the outer diameter of the filter membrane 44 is smaller than the inner diameter of the membrane chamber 43, so that the filter membrane 44 can freely move in the membrane chamber 43 under the impact of liquid medicine. In addition, the outer diameter of the filter membrane 44 is larger than the outer diameter of the mouth surface of the filter chamber 41, so that the filter membrane 44 can close the filter chamber 41 during injection.

In this embodiment, a rib 47 is disposed in the filtering chamber 41 for supporting the filtering membrane 44, the rib 47 is distributed in a cross shape with the axis of the needle seat 4 as the center array, as shown in fig. 6, or in a Y shape, as shown in fig. 7, or in a plurality of cylindrical ribs, as shown in fig. 8, the rib 47 is flush with the platform 411 of the mouth surface of the filtering chamber 41 to form a plane, so as to jointly support the filtering membrane 44, and in addition, the platform 421 on the limit ring 42 serves as a supporting platform for the filtering membrane 44, as well as is used for supporting the filtering membrane 44.

In this embodiment, the piston 3 has a protruding portion 31, the protruding portion 31 is bullet-shaped, and when the piston 3 moves toward the connector 12, the protruding portion 31 can extend into the inner cavity of the connector 12 and the inner cavity of the needle seat 4, so as to reduce the residual amount of the liquid medicine; because the piston 3 has elasticity, in this embodiment, the core rod 2 is provided with the protruding shoulder 25 near one end of the hand, specifically, one protruding shoulder 25 is respectively provided on the same place on four sheets of the core rod 2, when the protruding shoulder 25 abuts against the curled edge 11, the soft piston 3 can be prevented from going forward continuously, when the core rod 2 is loosened by hand, the piston 3 is retracted to generate blood return phenomenon, meanwhile, automatic positioning of the 0 scale can be realized when injection is completed, and in addition, a piston supporting table 26 for supporting the piston 3 is further provided on the core rod 2. In other alternatives, the protrusion 31 of the piston 3 is omitted, and a small change is made to the core rod 2, specifically, the top of the core rod 2 has an extension portion 27, as shown in fig. 11, the function of the extension portion 27 is consistent with that of the protrusion 31, and when the extension portion 27 moves toward the connector 12, the extension portion can extend into the inner cavity of the connector 12 and the inner cavity of the needle holder 4, so as to reduce the residual amount of the liquid medicine; the extension 27 specifically penetrates the piston 3, that is, the piston 3 is in a hollow cylinder shape, and is sleeved on the core rod 2 and located above the piston supporting table 26, so that the extension 27 of the core rod 2 is only slightly away from the filter membrane 44 after injection is finished, and the needle seat 4 is ensured not to be separated from the joint 12 of the outer sleeve 1 by the pushing force of the core rod 2. In addition, the extension part 27 is provided with an inclined stop shoulder 271, and when the extension part 27 moves towards the joint 12, the inclined stop shoulder 271 can be attached to the top of the inner cavity of the outer sleeve 1, so that the soft piston 3 is prevented from continuing to move forwards, the piston 3 cannot retract after the core rod 2 is loosened by hand, the blood return condition can be prevented, and meanwhile, the 0 scale automatic positioning can be realized when the injection is finished.

The working principle of the invention is as follows:

When the syringe is used for drawing medicine, the needle is usually downward inclined, because the filter membrane 44 is not fixed and has a certain movable space, at this time, the filter membrane 44 is on the opening surface platform 411 of the filter chamber 41, when medicine is drawn, the medicine enters into the needle seat 4 through the needle tube 5, as the medicine is pushed to the filter membrane 44 by the pulling of the core rod 2, the movable filter membrane 44 is forced to retreat onto the platform 421 of the limit ring 42, the medicine liquid inlet channel 46 around the filter membrane 44 is opened, the medicine liquid flows into the jacket 1 from the inlet channel 46 first, a time difference exists in this time, that is, the medicine liquid is required to be soaked in the filter membrane 44 by the filter membrane 44 first, the medicine liquid is required to enter into the medicine liquid filtering state under the action of a certain pressure when no other channel exists, and the medicine liquid is drawn only by a short time, because the filter membrane 44 is movable, and the existence of the medicine liquid inlet channel 46 slows down the time when the filter membrane 44 is soaked, the medicine liquid is much smaller than the pressure of the passing through the filter membrane 44, that is, the medicine liquid is preferably soaked in the liquid inlet channel 46, that is not soaked in the medicine liquid, and the medicine is drawn through the filter membrane 44, and the medicine liquid is not completely drawn by the filter membrane.

When in injection, the needle is always downward or downward inclined, and the filtering membrane 44 automatically moves forward and abuts against the rib line 47 of the liquid medicine filtering chamber 41 and the mouth surface platform 411 of the filtering chamber 41 under the pushing of the liquid medicine, so that the liquid medicine filtering chamber 41 is closed, and the liquid medicine flows into the needle tube 5 through the liquid medicine filtering chamber 41 after being filtered by the filtering membrane 44, thereby realizing the filtering of the liquid medicine.

In this embodiment, the jacket 1 is provided with a first positive scale mark 13, the blade of the core rod 2 is provided with a second negative scale mark, the positive and negative metering scale marks are used for displaying the liquid volume in the jacket 1, and the blade is also provided with a number 24 matched with the corresponding second scale mark. The second graduation line adopts a notch bar-shaped hollowed-out graduation line 21, as shown in fig. 1, an inner hollowed-out bar-shaped graduation line 22, as shown in fig. 9, or a round hole-shaped hollowed-out graduation line 23, as shown in fig. 10, and a number 24 is concave, convex or hollowed-out.

The setting method of the forward metering scale mark is that the outer sleeve with the same specification and model of the scale mark is used, firstly, the volume of the protruding part of the piston or the extending part of the core rod is calculated, the volume is converted into the height of the cylindrical volume of the inner cavity of the outer sleeve, and the scale mark is pushed forward equidistantly and parallelly according to the height distance towards the joint direction of the outer sleeve.

The setting method of the reverse hollowed scale mark comprises the steps of matching an original jacket, a core bar and a piston with the same specification, enabling a metering datum line (a first circle of convex circle line on the piston) on the piston to coincide with a traditional printing 0 scale mark on the jacket, taking the top of a curled edge of the jacket as a reverse metering datum line, setting the positions of the reverse metering datum line corresponding to two sheets of the core bar as reverse 0 scale marks, calculating the distance between the reverse metering datum line and two ends of the core bar, adding the forward scale mark to the direction of the core bar with the piston, advancing forward in parallel, and setting the point as a starting 0 scale mark of the reverse metering scale; when the core bar die is manufactured, according to the size, the positions of 0 dividing lines are firstly determined at corresponding positions on the planes of the cavities of the two parting surfaces of the die, the scale line models are arranged on the positions of the core bars with pistons in parallel at equal distances, the heights of the scale line models are the same as the thickness of the parting surface sheet, the two parting surfaces are assembled to form a complete sheet and the scale line models, and the hollow scale lines are formed after injection molding. The reverse marked hollowed-out digital model is the same as the scale mark model setting method. The setting method of the notch strip-shaped hollowed-out scale mark and the setting method of the inner hollowed-out scale mark model are different in that the notch strip-shaped hollowed-out scale mark model is close to the edge, namely, the notch strip-shaped hollowed-out scale mark model is perpendicularly set inwards from the edge of the die cavity sheet, the inner hollowed-out scale mark model is perpendicularly and parallelly set inwards from the edge of the die cavity sheet by about 0.4mm, the setting method of the round hole-shaped hollowed-out scale mark is the same as that of the inner hollowed-out scale mark, one round hole is formed in the short scale mark, and two circle holes are formed in the long scale mark.

Taking a 10mm medicine dispenser as an example, the length of a short scale mark is about 1.5mm, the length of a long scale mark is about 3mm, the width is 0.6-0.8 mm, the diameter of a round hole-shaped hollowed scale mark is 0.8mm, and the line width of a digital model is 0.5-0.6 mm and is arranged below or beside the long scale mark; in order to compensate the strength of the core bar sheet reduced by the notch strip-shaped hollowed-out graduation line, the axial whole thickening is 0.4mm at the position from the tail end of the long graduation line of the sheet with the graduation line to the intersection of the core bar sheet.

When the quantitative injection is needed, the small steel pipes 6 (shown in fig. 12) with chamfer angles at the edges of the two port surfaces are pressed into or inserted into corresponding scale marks to be quantified, after the quantitative injection is finished, the two ends of the small steel pipes 6 can be abutted against the outer port surfaces (the reverse metering datum line 111) of the curled edges 11 of the outer sleeve 1, the length of the small steel pipes 6 is lengthened by about 16mm on the basis of the diameter of the outer sleeve 1 of the corresponding injector model, the outer diameter of the small steel pipes 6 is slightly larger than the scale marks, and moderate interference fit with the scale marks is realized, so that the small steel pipes 6 can not fall off in use.

Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.

Claims

1. The utility model provides a precision filtration syringe, includes overcoat and core bar, the top of core bar is provided with the piston, be connected with detachable needle file on the joint of overcoat, install the needle tubing on the needle file, the oral area edge of overcoat afterbody is provided with the turn-up, its characterized in that, the inner chamber top of needle file be provided with the communicating filter chamber of needle tubing, be provided with the muscle line that is used for supporting the filter membrane in the filter chamber, the muscle line is parallel with filter chamber oral area; a limit ring is arranged below the filtering chamber in the inner cavity of the needle seat, a diaphragm chamber is formed between the limit ring and the filtering chamber, a filtering diaphragm is arranged in the diaphragm chamber, a plurality of grooves are formed in the side wall of the top of the inner cavity of the needle seat, and the grooves are matched with the limit ring to form a plurality of liquid inlet passages which are communicated with the filtering chamber and the connector; the height of the membrane chamber exceeds twice the thickness of the filter membrane, the outer diameter of the filter membrane is smaller than the inner diameter of the membrane chamber, and the outer diameter of the filter membrane is larger than the diameter of the mouth surface of the filter chamber so as to ensure that the filter membrane can close the filter chamber during injection;

when the liquid medicine is extracted, the liquid medicine can drive the filter membrane to open a liquid inlet channel, so that the extraction of the liquid medicine is realized; when the liquid medicine is filled, the liquid medicine can drive the filter membrane to close the filter chamber, so that the liquid medicine is filtered.

2. The precision filtration syringe of claim 1 wherein the plunger has a projection that can extend into the adapter lumen and hub lumen.

3. The precise filter injector of claim 1 or 2, wherein the core pin is provided with a male shoulder that can be automatically positioned against the 0 scale on the bead.

4. The precision filter syringe of claim 1, wherein the top portion of the core rod has an extension that can extend into the adapter lumen and the hub lumen.

5. The precision filter syringe of claim 4, wherein the extension has a beveled shoulder that engages the top of the interior cavity of the outer sleeve for 0 scale automatic positioning.

6. The precision filtration syringe of claim 1 wherein the jacket has a first scale line thereon for displaying the volume of liquid in the jacket; the core bar is provided with a second scale mark for displaying the volume of liquid in the jacket and a number matched with the corresponding second scale mark.

7. The precise filtration syringe of claim 6, wherein the second graduation is a notched bar-shaped graduation, an inner graduation, or a round hole-shaped graduation.

8. The precision filter syringe of claim 6, wherein the number is concave, convex or hollowed out.