CN114748734A

CN114748734A - Precise filtering injector

Info

Publication number: CN114748734A
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: 2022-07-15

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 base, a needle tube is arranged on the needle base, the top of an inner cavity of the needle base is provided with a filtering chamber communicated with the needle tube, the inner cavity of the needle base is positioned below the filtering chamber and is provided with a limiting ring, a diaphragm chamber is formed between the limiting ring and the filtering chamber, a filtering diaphragm is arranged in the diaphragm chamber, the side wall of the top of the inner cavity of the needle base is provided with a plurality of grooves, and the grooves and the limiting ring are matched to form a plurality of liquid inlet channels communicated with the filtering chamber and the joint; when the liquid medicine is extracted or injected, the liquid medicine can drive the filter membrane to open the liquid inlet channel or close the filter chamber. The invention skillfully arranges the liquid inlet channel, the membrane chamber and the filter chamber by utilizing the space of the inner cavity of the needle seat, skillfully utilizes the filter membrane as a valve, opens the liquid inlet channel and closes the filter chamber, and realizes the quick extraction of the liquid medicine and the filtration during the injection of the liquid medicine.

Description

Precise filtering injector

Technical Field

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

Background

At present, the injectors used in clinic are basically common injectors without liquid medicine filtering function, the pistons of the common injectors are basically in a structure of a cylinder and the top of a cone, so that certain residual quantity exists in the inner cavity of the connector of the injector and the inner cavity of the needle seat, the precise filtration of liquid medicine is determined to be realized due to the structural characteristics of the injectors, the design difficulty of the injectors is much higher than that of a precise filtration infusion apparatus, because the liquid medicine of the infusion apparatus flows in a one-way and the liquid medicine of the injectors needs to flow in two ways, a double-chamber design is adopted in many designs, namely a liquid inlet chamber, a filter chamber and a membrane are fixed, and even if the pistons are pushed to the bottom, the liquid medicine in the chambers can not be utilized, so that the residual quantity of the liquid medicine is increased, and expensive medicine resources are wasted, further, such a precision filter syringe has many accessories and a complicated structure, and patent specification No. CN207722184U discloses a liquid medicine precision filter for a syringe, which comprises: the front end of the filter body is a conical end used for connecting a syringe needle, and the rear end of the filter body is a filtering end used for connecting a syringe needle seat; the filter body is internally provided with a liquid channel, at least one liquid inlet channel for one-way liquid pumping and at least one liquid outlet channel for one-way liquid discharging, 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; one-way valves are arranged in the liquid inlet channel and the liquid outlet channel, and a filtering membrane is arranged at one end of the liquid outlet channel, which is close to the filtering end. In addition, the patent specification with publication number CN208958996U discloses a two-way secondary filter syringe needle includes protective sheath, needle tubing, needle tube seat and base, the inside end middle part of needle tube seat is equipped with circular gasket, be equipped with a plurality of through-holes on the circular gasket, circular gasket dorsad the one end of needle tube seat is equipped with duck tongue silica gel spare, the up end of duck tongue silica gel spare is equipped with the open slot, the lower terminal surface of duck tongue silica gel spare is equipped with the secondary filter diaphragm, the base is hollow structure, include with the inside end that the needle tubing seat is connected reaches the outside end of being connected with the syringe, serve inwards and be equipped with the cylinder, be equipped with two even symmetrical liquid holes of crossing on the cylinder. The two schemes have the advantages of more accessories, excessively complex structure, low production efficiency, high cost and high price, so that the market has low acceptance in the current stage and expects a product with high cost performance.

The existing common syringes only have 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 not clearly seen, the color of the outer sleeve of the light-resistant syringe is also darker, and when the color of the liquid medicine is darker, the scale marks on the outer sleeve are also not clearly seen, so that the dosage is inaccurate, and the curative effect is influenced.

Disclosure of Invention

The invention aims to provide a precise filtering syringe, wherein a filtering chamber adopts a single-chamber design, the structure is simple, and the aim of filtering liquid medicine can be fulfilled without adding excessive accessories.

A precise filtering injector comprises an outer sleeve and a core rod, wherein a piston is arranged at the top of the core rod, a detachable needle seat is connected to a joint of the outer sleeve, a needle tube is mounted on the needle seat, a turned edge is arranged at the edge of an opening at the tail of the outer sleeve, a filtering chamber communicated with the needle tube is arranged at the top of an inner cavity of the needle seat, a limiting ring is arranged below the filtering chamber in the inner cavity of the needle seat, a diaphragm chamber is formed between the limiting 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 and the limiting ring are matched to form a plurality of liquid inlet channels communicated with the filtering chamber and the joint; when the liquid medicine is extracted or injected, the liquid medicine can drive the filter membrane to open the liquid inlet channel or close the filter chamber.

The scheme utilizes the inner space of the needle seat, and the liquid inlet channel, the diaphragm chamber and the filter chamber are arranged, and are in an integrally formed structure with the needle seat, so that the diaphragm chamber and the liquid inlet channel are formed only by additionally arranging a limiting ring without additionally manufacturing accessories; meanwhile, the filter membrane is skillfully used as a valve to open the liquid inlet channel and close the filter chamber, and certain conditions and time difference required by the filter membrane for filtering the liquid medicine are utilized, 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 guaranteed to be finished during the injection of the liquid medicine.

Preferably, a rib for supporting the filter membrane is arranged in the filter chamber.

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

Preferably, the piston has a protrusion which can extend into the connector cavity and the hub cavity.

Further preferably, the core rod is provided with a convex clamping shoulder which can abut 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 joint inner cavity and the needle seat inner cavity.

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

Preferably, the outer sleeve is provided with a first scale mark for displaying the volume of the liquid in the outer sleeve; and the core rod is provided with second scale marks for displaying the volume of the liquid in the outer sleeve and numbers matched with the corresponding second scale marks.

Further preferably, the second scale mark is a notched strip-shaped hollowed scale mark, an inner hollowed strip-shaped scale mark or a round hole-shaped hollowed scale mark.

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

The invention has the beneficial effects that:

(1) through utilizing the space of needle file inner chamber, set up inlet channel, diaphragm room and filter chamber ingeniously, utilize the filter diaphragm as the valve ingeniously, open inlet channel and close the filter chamber, can realize the filtration of the quick extraction of liquid medicine and liquid medicine injection time.

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

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

(4) Through setting up reverse measurement scale mark, effectively compensate the not clear not enough of forward measurement scale mark when the liquid medicine colour is darker, can also utilize reverse measurement scale mark to realize the injection of location ration.

Drawings

FIG. 1 is a schematic view (with notched bar-shaped hollow scale lines) of the liquid inlet channel after opening when extracting the liquid medicine;

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

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

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

FIG. 5 is a schematic view of the needle mount transecting the liquid inlet channel;

FIG. 6 is a cross-sectional view of a rib;

FIG. 7 is a cross-sectional view of a Y-shaped rib;

FIG. 8 is a schematic cross-sectional view of a cylindrical tendon;

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

FIG. 10 is a schematic view of a circular hole-shaped hollow scale;

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

FIG. 12 shows a small steel tube for fixed-position and fixed-quantity injection.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-5, a precise filtering injector comprises an outer sleeve 1 and a core rod 2, wherein the top of the core rod 2 is provided with a piston 3, 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 at the tail part of the outer sleeve 1 is provided with a turned edge 11, the joint 12 of the outer sleeve 1 is connected with a detachable needle base 4, and a needle tube 5 is glued on the needle base 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 filter chamber 41, the filter chamber 41 is communicated with the needle tube 5, and the inner cavity of the needle seat 4 is provided with a limiting ring 42 below the filter chamber 41; in this embodiment, the limiting ring 42 is specifically clamped on the side wall of the inner cavity of the needle base 4, specifically, an annular concave surface is arranged on the side wall of the inner cavity of the needle base 4, the limiting ring 42 is in interference fit with the concave surface, and in addition, the center of the limiting ring 42 is hollow and is used for circulation of liquid medicine during liquid injection; form diaphragm room 43 between spacing collar 42 and the filter chamber 41, be provided with filtering diaphragm 44 in the diaphragm room 43, many recesses 45 have been seted up to the inner chamber top lateral wall of needle file 4, recess 45 specifically uses the axis of needle file 4 to distribute on the inner chamber top lateral wall of needle file 4 as central array, recess 45 forms many inlet channel 46 with spacing collar 42 cooperation, in this embodiment, recess 45 is provided with four, also, four inlet channel 46 are formed in recess 45 and spacing collar 42 cooperation, inlet channel 46 intercommunication filter chamber 41 and joint 12, filter chamber 41, diaphragm room 43, inlet channel 46 forms liquid passage with the inner chamber that connects 12 when drawing liquid. In order to facilitate the arrangement of the groove 45 (liquid inlet passage 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 sheet 44 is a liquid medicine filter membrane having relatively high strength, such as a PP membrane or a PES coating membrane. The thickness of the filter diaphragm 44 is 0.3-0.5 mm, in addition, the height of the diaphragm chamber 43 exceeds twice the thickness of the filter diaphragm 44, and the outer diameter of the filter diaphragm 44 is smaller than the inner diameter of the diaphragm chamber 43, so that the filter diaphragm 44 can move freely in the diaphragm chamber 43 under the impact of the liquid medicine. In addition, the outer diameter of the filter membrane 44 is larger than the outer diameter of the mouth face of the filter chamber 41, so that the filter membrane 44 can close the filter chamber 41 during injection.

In this embodiment, the filtering chamber 41 is provided with a rib 47 for supporting the filtering membrane 44, the rib 47 is distributed in an array with the axis of the needle holder 4 as the center, specifically in a cross shape 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 on the opening surface of the filtering chamber 41 to form a plane, and supports the filtering membrane 44 together, and in addition, the platform 421 on the limiting ring 42 is used as a support platform of the filtering membrane 44 and is used for supporting the filtering membrane 44 in the same way.

In this embodiment, the piston 3 has a protrusion 31, the protrusion 31 is bullet-shaped, when the piston 3 moves towards the connector 12, the protrusion 31 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; because the piston 3 has elasticity, in the embodiment, one end of the core rod 2 close to the press hand is provided with a convex clamping shoulder 25, specifically, the same position of each of the four leaves of the core rod 2 is provided with one convex clamping shoulder 25, the convex clamping shoulder 25 can prevent the soft piston 3 from continuing to move forwards when abutting against the turned edge 11, the piston 3 retracts after the core rod 2 is loosened by the hand to generate the blood return phenomenon, and meanwhile, the automatic positioning of 0 scale can be realized when the injection is finished, and in addition, the core rod 2 is also provided with a piston support 26 for supporting the piston 3. In other alternatives, the protrusion 31 of the plunger 3 is eliminated and the core rod 2 is slightly changed, specifically, the top of the core rod 2 has an extension 27, as shown in fig. 11, the function of the extension 27 is consistent with that of the protrusion 31, and the extension 27 can extend into the inner cavity of the connector 12 and the inner cavity of the needle holder 4 when moving towards the connector 12, so as to reduce the residual amount of the liquid medicine; the extending part 27 penetrates the piston 3, that is, the piston 3 is a hollow cylinder, and is sleeved on the core rod 2 and located above the piston support 26, so that the extending part 27 of the core rod 2 is only a small distance away from the filter membrane 44 after the injection is finished, so as to ensure that the needle base 4 is not separated from the joint 12 of the outer sleeve 1 by the jacking force of the core rod 2. In addition, the extension part 27 is provided with an inclined retaining shoulder 271, and when the extension part 27 moves towards the joint 12, the inclined retaining shoulder 271 can be attached to the top of the inner cavity of the outer sleeve 1 to prevent the soft piston 3 from going forward, so that the piston 3 cannot retract after the hand releases the core bar 2, the blood return can be prevented, and meanwhile, the automatic positioning of 0 scale can be realized when the injection is completed.

The working principle of the invention is as follows:

when the injector is used for drawing medicine, the needle head is mostly downward inclined, because the filtering membrane 44 is not fixed and has a certain moving space, at this time, the filtering membrane 44 is on the mouth platform 411 of the filtering chamber 41, when the medicine liquid is drawn, the medicine liquid enters the needle base 4 through the needle tube 5, along with the pulling of the core rod 2, the medicine liquid pushes the filtering membrane 44, the movable filtering membrane 44 is forced to retreat to the platform 421 of the spacing ring 42, the medicine liquid inlet channel 46 around the filtering membrane 44 is opened, the medicine liquid flows into the outer sleeve 1 from the liquid inlet channel 46 at first, a time difference exists on the surface, namely, the medicine liquid filtered by the filtering membrane 44 needs to be soaked by the medicine liquid through the filtering membrane 44, the medicine liquid can enter a medicine liquid filtering state under certain pressure action when no other channel exists, and the drawing of the medicine liquid only needs a few seconds to be completed, because the filter membrane 44 is movable and the liquid medicine inlet channel 46 exists, the soaking time of the filter membrane 44 is reduced, the pressure of the liquid medicine passing through the liquid inlet channel 46 is much smaller than the pressure of the liquid medicine passing through the filter membrane 44, the liquid medicine can preferentially pass through the liquid inlet channel 46, that is to say, when the filter membrane 44 is not soaked by the liquid medicine to produce the filtering effect, the liquid medicine extraction work is also completed.

And during the injection, the syringe needle often is downward or oblique downwards, and under the promotion of liquid medicine, filter membrane 44 goes forward automatically again and leans on muscle line 47 and the oral surface platform 411 of filter chamber 41 in liquid medicine filter chamber 41, seals liquid medicine filter chamber 41, and the liquid medicine flows into needle tubing 5 through liquid medicine filter chamber 41 after filter membrane 44 filters, realizes the filtration to the liquid medicine.

In this embodiment, the outer sleeve 1 is provided with a forward first scale mark 13, the blade of the core bar 2 is provided with a reverse second scale mark, the forward and reverse metering scale marks are used for displaying the volume of the liquid in the outer sleeve 1, and the blade is also provided with a number 24 matched with the corresponding second scale mark. The second scale mark is a notched strip-shaped hollow scale mark 21 as shown in fig. 1, an inner hollow strip-shaped scale mark 22 as shown in fig. 9, or a round hole-shaped hollow scale mark 23 as shown in fig. 10, and the number 24 is concave, convex or hollow.

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 and converted into the height of the cylindrical volume of the inner cavity of the outer sleeve, and the scale mark is arranged in parallel forwards at equal distance in the direction of the joint of the outer sleeve according to the height distance.

The setting method of the reverse hollow scale mark comprises the steps that an original outer sleeve, a core bar and a piston with the same specification and model are matched, a metering datum line (a first circle of outward convex ring line on the piston) on the piston is superposed with a traditional printed 0 scale mark on the outer sleeve, at the moment, the top of the turned edge of the outer sleeve is used as a reverse metering datum line, the positions of the reverse metering datum line corresponding to two leaves of the core bar are set as the reverse 0 scale mark, the distances between the reverse metering datum line and two ends of the core bar are calculated, the distance for forward parallel pushing of the forward scale mark is added towards the direction of the core bar with the piston, and then the point is formally set as the initial 0 scale mark of the reverse metering scale mark; when the core rod mold is manufactured, according to the size, the position of a 0-line is determined at a corresponding position on the plane of a cavity of two parting surfaces of the mold, scale mark models are arranged on the other scale marks in parallel at equal distances to the end of the core rod with the piston, the height of each scale mark model is the same as the thickness of a page of the same parting surface, the two parting surfaces form a complete page and scale mark model after being assembled, and the hollow scale marks are formed after injection molding. The reverse marked hollow-out digital model and the scale mark model are set in the same way. The setting method difference of breach bar fretwork scale mark and interior fretwork bar scale mark model lies in, and breach bar fretwork scale mark model is by the limit, begins to set up perpendicularly inwards from mould cavity page or leaf edge promptly, and interior fretwork bar scale mark is that beginning perpendicular and parallel arrangement inwards apart from about 0.4mm of mould cavity page or leaf edge, and the setting method of round hole shape fretwork scale mark is the same with interior fretwork bar scale mark, a round hole of short scale mark, two circles of holes of long scale mark.

Taking a 10mm medicine dispenser as an example, the length of the short scale marks is about 1.5mm, the length of the long scale marks is about 3mm, and the width of the long scale marks is 0.6-0.8 mm, the diameter of the round hole-shaped hollow scale marks is 0.8mm, the width of the line of the digital model is 0.5-0.6 mm, and the digital model is arranged below or beside the long scale marks; in order to compensate for the strength of the core rod blade reduced by the strip-shaped hollow scale marks, the axial whole thickness from the tail end of the long scale mark of the blade with the scale marks to the intersection of the core rod blade is increased by 0.4 mm.

When the quantitative injection needs to be positioned, the small steel tube 6 (as shown in fig. 12) with the edges of the two port surfaces being subjected to chamfering treatment is pressed into or inserted into a corresponding scale mark needing to be quantified, after the quantitative injection is completed, the two ends of the small steel tube 6 can be abutted against the outer port surface (the reverse metering datum line 111) of the curled edge 11 of the outer sleeve 1, the length of the small steel tube 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 tube 6 is slightly larger than the scale mark, and the small steel tube 6 is in moderate interference fit with the scale mark, so that the small steel tube 6 cannot fall off in use.

Although the present invention has been described in detail 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 in the foregoing embodiments, or equivalents may be substituted for elements thereof.

Claims

1. A precise filtering injector comprises an outer sleeve and a core rod, wherein a piston is arranged at the top of the core rod, a detachable needle seat is connected to a joint of the outer sleeve, a needle tube is mounted on the needle seat, and a turned edge is arranged at the edge of an opening at the tail of the outer sleeve; when the liquid medicine is extracted or injected, the liquid medicine can drive the filter membrane to open the liquid inlet channel or close the filter chamber.

2. The precision filtration syringe of claim 1, wherein a tendon for supporting a filter membrane is disposed within the filter chamber.

3. The precision filtration syringe of claim 1, wherein the membrane chamber has a height that exceeds twice the thickness of the filter membrane.

4. The precision filtration syringe of claim 1, wherein the plunger has a protrusion that extends into the adapter lumen and the hub lumen.

5. The precise filtration syringe of claim 1 or 4, wherein the core rod is provided with a convex clamping shoulder which can abut against the crimp edge for automatic positioning of 0 scale.

6. The precision filtration syringe of claim 1, wherein the top of the core pin has an extension that extends into the connector and hub lumens.

7. The microfiltration syringe of claim 6 wherein the extension has a beveled stop shoulder adapted to engage the top of the inner chamber of the outer sleeve for 0 gauge automatic positioning.

8. The microfiltration syringe of claim 1 wherein the outer sheath has disposed thereon first graduations for indicating the volume of fluid within the outer sheath; and the core rod is provided with second scale marks for displaying the volume of the liquid in the outer sleeve and numbers matched with the corresponding second scale marks.

9. The precise filtration syringe of claim 8, wherein the second scale mark is a notched strip-shaped hollow scale mark, an inner hollow strip-shaped scale mark, or a round hole-shaped hollow scale mark.

10. The precise filtration syringe of claim 8, wherein the number is concave, convex or hollowed.