CN213311736U

CN213311736U - Medical injector piston

Info

Publication number: CN213311736U
Application number: CN202021864614.1U
Authority: CN
Inventors: 不公告发明人
Original assignee: Shijiazhuang Bopu Information Technology Co ltd
Current assignee: Shijiazhuang Bopu Information Technology Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-06-01
Anticipated expiration: 2030-08-31

Abstract

The utility model discloses a medical injector piston, including movable assembly in this internal piston body of cylinder, in piston body outer cladding has one deck confined rubber layer, the perisporium on rubber layer expands tightly on the inner wall of cylinder body, and the rubber layer is kept away from the one end terminal surface of cylinder body and syringe needle link and the terminal surface alternate segregation that the piston body corresponds. The utility model provides an in-process of dissolving medicine ware suction or propelling movement liquid medicine, the phenomenon that can't be by suction and pulling appears in the piston, and then makes to dispense smoothly. The utility model is suitable for a technical field of medical syringe.

Description

Medical injector piston

Technical Field

The utility model belongs to the technical field of medical syringe, specifically speaking relates to a medical syringe piston.

Background

At present, in medical personnel's the field of dispensing, because the operation of dispensing that needs a large amount of repetition every day, in order to reduce nurse's working strength, adopt electronic or pneumatic equipment to connect and dissolve medicine ware (syringe), application mechanical transmission or pneumatic drive dissolve medicine ware and aspirate the liquid medicine, and then realized reducing nurse's working strength's purpose. However, when the piston without the core rod in the drug dissolver is driven to suck or push the liquid medicine, the piston cannot be pulled by the suction force, and the medicine cannot be dispensed smoothly.

SUMMERY OF THE UTILITY MODEL

The utility model provides a medical syringe piston for solve the in-process of dissolving medicine ware suction or propelling movement liquid medicine, the piston can't appear by suction force and the phenomenon of pulling, and then leads to the problem that can't dispense smoothly.

In order to achieve the above object, the utility model adopts the following technical scheme:

a medical injector piston comprises a piston body movably assembled in a syringe body, wherein a closed rubber layer is coated outside the piston body, the peripheral wall of the rubber layer is expanded on the inner wall of the syringe body, and the end face, far away from the connection end of the syringe body and a needle head, of the rubber layer is separated from the end face corresponding to the piston body.

Furthermore, a plurality of annular bulges are constructed on the circumferential surface of the rubber layer, the annular bulges are arranged at intervals along the axial direction of the piston body, and the annular bulges are superposed with the axial line of the piston body.

Furthermore, a recess is formed on the end surface of the piston body, which is separated from the rubber layer, and the recess is located at the center of the piston body.

Furthermore, the end face of the piston body, which is separated from the rubber layer, is a concave arc concave face, and the lowest position of the arc concave face is located at the center of the piston body.

Furthermore, the piston body is an arc convex surface which is convex downwards on the end face of one end, which is in contact with the liquid medicine in the needle cylinder body, and the highest position of the arc convex surface is positioned at the center of the piston body.

The utility model discloses owing to adopted foretell structure, it compares with prior art, and the technical progress who gains lies in: because the utility model discloses a piston body is by the rubber layer cladding, and the rubber layer keeps away from the one end terminal surface of cylinder body and syringe needle link and the terminal surface alternate segregation that the piston body corresponds, the part of rubber layer and piston body separation is pulled under the pulling force of external pumping, and then breaks away from the laminating with the terminal surface that the piston body corresponds, because the rubber layer has elastic deformation ability, this part on rubber layer warp and cooperate the pulling force of pumping and drive piston body motion, and then accomplishes the suction of cylinder body to the liquid medicine, can know from this, the utility model provides an in-process of dissolving medicine ware suction or propelling movement liquid medicine, the phenomenon that can't be pulled by the pumping force appears in the piston, and then makes to dispense smoothly.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.

In the drawings:

fig. 1 is a schematic structural view of the piston body of the present invention connected to a rubber layer;

fig. 2 is a schematic structural view of another piston body of the present invention connected to a rubber layer;

fig. 3 is a schematic structural view of another piston body of the present invention connected to a rubber layer;

fig. 4 is a schematic structural view of another piston body of the present invention connected to a rubber layer;

FIG. 5 is a schematic structural view of a drug dissolving syringe for dispensing a drug according to the present invention;

FIG. 6 is a schematic view of the structure of FIG. 5 at another angle;

FIG. 7 is a schematic structural view of a special sealing member of the present invention for engaging with a syringe for dissolving medicine;

fig. 8 is an axial structure sectional view of the drug dissolving needle cylinder and the special sealing member for dispensing of the present invention.

Labeling components: 1-syringe body, 2-needle head connector, 3-flange, 4-annular clamping groove, 5-sealing groove, 6-positioning opening, 7-rubber ring body, 8-sealing bulge, 9-positioning bulge, 10-piston body, 11-rubber layer, 12-annular bulge, 13-recess and 14-arc concave surface.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the invention.

The utility model discloses a medical injector piston, as shown in figure 1, including piston body 10, the outside cladding of piston body 10 has one deck confined rubber layer 11, and the perisporium of this rubber layer 11 expands tightly on the inner wall of cylinder body, and the structure activity assembly that piston body 10 and rubber layer 11 constitute is at the cylinder originally internally, and wherein, cylinder body and syringe needle link's one end terminal surface and the corresponding terminal surface alternate segregation of piston body 10 are kept away from to rubber layer 11. The utility model discloses a theory of operation and advantage lie in: because the utility model discloses a piston body 10 is by the cladding of rubber layer 11, and the rubber layer 11 keeps away from the one end terminal surface of cylinder body and syringe needle link and the terminal surface alternate segregation that piston body 10 corresponds, the part that rubber layer 11 and piston body 10 separated under the pulling force of external world is by the pulling, and then breaks away from the laminating with the corresponding terminal surface of piston body 10, because rubber layer 11 has elastic deformation ability, this part of rubber layer 11 warp and cooperates the pulling force and drive piston body 10 motion, and then accomplishes the suction of cylinder body to the liquid medicine, can know from this, the utility model provides an in-process of dissolving medicine ware suction or propelling movement liquid medicine, the phenomenon that can't be drawed and pulling appears in the piston, and then makes and dispenses smoothly.

As a preferred embodiment of the present invention, in order to reduce the friction between the peripheral wall of the rubber layer 11 and the inner wall of the cylinder body, a means is employed to reduce the contact area between the two, specifically, a plurality of annular protrusions 12 are integrally formed on the peripheral surface of the rubber layer 11, the annular protrusions 12 are arranged at intervals in the axial direction of the piston body 10, and each annular protrusion 12 coincides with the axis of the piston body 10.

As a preferred embodiment of the present invention, in order to improve the drawing force of the rubber layer 11, and ensure the stress concentration in the middle of the piston in the process of pushing the piston body 10, so as to prevent the piston body 10 from shifting in the cylinder body. Specifically, two measures are taken, and in the first measure, as shown in fig. 2, a recess 13 is formed on the end surface of the piston body 10, which is separated from the rubber layer 11, and the recess 13 is located at the center of the piston body 10; secondly, as shown in fig. 3, the end surface of the piston body 10 separated from the rubber layer 11 is a concave arc concave surface 14, and the lowest part of the arc concave surface 14 is located at the center of the piston body 10.

As a preferred embodiment of the present invention, in order to avoid that the piston body 10 sticks to the end portion of the syringe body after pushing the liquid medicine in the syringe body completely, and cannot be sucked again, the specific measure is, as shown in fig. 4, that the end surface of the piston body 10 contacting the liquid medicine in the syringe body is a downward convex arc convex surface, and the highest point of the arc convex surface is located at the center of the piston body 10.

The utility model discloses a dispense and use medicine dissolving cylinder, as shown in fig. 5-6, including cylinder body 1, 1 one end of this cylinder body is sealed, and it has syringe needle connector 2 to construct at this end, an erection joint for the syringe needle, another department at cylinder body 1 is constructed with along its radial outside flange 3 that extends, medical personnel insert operating handle with 3 flanges of cylinder body 1, this flange 3 stretches into in the operating handle and fixed with operating handle circumference joint, annular sealed recess 5 has been seted up to the one end of keeping away from syringe needle connector 2 at flange 3, this sealed recess 5 and cylinder body 1's axis coincidence, and sealed recess 5 communicates through the cavity position of location mouth 6 with cylinder body 1.

As a preferred embodiment of the present invention, in order to facilitate the production, the cost input and the liquid level observation in the syringe body 1, the needle head connector 2 and the flange 3 are made of an integrally formed polyethylene material.

As a preferred embodiment of the present invention, as shown in fig. 5, in order to further limit the axial rotation of the syringe body 1 and the operating handle and improve the connection and sealing strength between the syringe body 1 and the operating handle, the number of the positioning holes 6 is at least two and is uniformly arranged along the circumferential direction of the flange 3.

As a preferred embodiment of the present invention, as shown in fig. 6, a ring slot 4 extending radially inward is formed on the circumferential surface of the flange 3, and the flange 3 is connected to the operating handle via the ring slot 4. Install the joint on the operating handle and connect, this joint connects and realizes being connected with cylinder body 1 through the joint in ring groove 4, like this because cylinder body 1 is fixed with operating handle annular joint for the joint strength of the two improves, and then improves operating handle's life, and connects back cylinder body 1 and can't take place axial motion by the joint tie, and then has ensured its leakproofness with operating handle.

The utility model also discloses a special sealing member with dissolve medicine cylinder matched with, as shown in fig. 7, including rubber ring body 7, this rubber ring body 7 is fixed on operating handle, is constructed along its axially extended annular sealed arch 8 in the inboard of rubber ring body 7, is constructed with location mouthful 6 corresponding position department on sealed arch 8 protruding 9, and when the terminal surface of rubber ring body 7 was hugged closely on the flange 3 terminal surface in the sealed recess 5 outside, sealed arch 8 and location protruding 9 inlayed respectively and were established in sealed recess 5 and location mouthful 6.

As a preferred embodiment of the present invention, the cross section of the rubber ring body 7 is rectangular, so that the rubber ring body 7 and the end surface of the flange 3 are in surface-to-surface contact, and the sealing performance between the syringe body 1 and the rubber ring body 7 is further improved.

As a preferred embodiment of the present invention, the syringe body 1 is marked with a sub alignment line, and the operating handle is provided with a main alignment line, and when the syringe body 1 is inserted into the operating handle and the sub alignment line is aligned with the main alignment line, the sealing protrusion 8 and the positioning protrusion 9 are respectively inserted into the sealing groove 5 and the positioning hole 6. The problem that medical personnel can not accurately position in the process of inserting the needle cylinder body 1 into the operation joint is avoided, and after the needle cylinder body 1 is inserted into a preset position, the position of the needle cylinder body is the best angle for observing the liquid level of the medical personnel.

To sum up, as shown in fig. 8, the flange 3 is connected with the operating handle, so that the connecting strength between the butterfly wing at the tail end of the existing syringe body 1 and the operating handle is increased, and the connection is convenient, and meanwhile, the syringe body 1 is circumferentially fixed by the flange 3, and the end surface of the flange 3 is adopted for sealing, so that the problem of mutual influence between the fixation and the sealing due to the two-in-one function of sealing and connecting the end surface of the existing drug dissolving device is solved; moreover, due to the arrangement of the sealing groove 5, the positioning opening 6 and a special sealing piece, the sealing between the syringe body 1 and the operating handle is changed in a step-type gradient manner, so that the sealing capability is improved and the service life is prolonged; the positioning opening 6 is matched with the positioning bulge 9, so that the strength of the syringe body 1 and the operating handle is increased on one hand, and the syringe body 1 is positioned on the other hand, so that a nurse can observe scales on the syringe body 1 conveniently, and the syringe body 1 and the handle are prevented from rotating axially; therefore, the utility model provides a dissolve the inconvenient, the problem that the leakproofness reduces of medicine ware cartridge.

Finally, it should be noted that: 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. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the protection of the claims of the present invention.

Claims

1. A medical injector piston, characterized in that: the syringe comprises a piston body movably assembled in a syringe body, wherein a closed rubber layer is coated outside the piston body, the peripheral wall of the rubber layer is expanded on the inner wall of the syringe body, and the end face of one end, far away from the syringe body and a needle head connecting end, of the rubber layer is separated from the corresponding end face of the piston body.

2. The medical injector piston of claim 1, wherein: the circumferential surface of the rubber layer is provided with a plurality of annular bulges which are arranged at intervals along the axial direction of the piston body, and the annular bulges are superposed with the axis of the piston body.

3. The medical injector piston of claim 1, wherein: and a recess is formed on the end surface of the piston body, which is separated from the rubber layer, and the recess is positioned in the center of the piston body.

4. The medical injector piston of claim 1, wherein: the end face of the piston body, which is separated from the rubber layer, is a concave arc concave face, and the lowest part of the arc concave face is positioned at the center of the piston body.

5. The medical injector piston of claim 1, wherein: the piston body is an arc convex surface which is convex downwards on the end face of one end, which is in contact with the liquid medicine in the needle cylinder body, and the highest position of the arc convex surface is positioned at the center of the piston body.