CN215426897U - Novel in vivo liquid injection device - Google Patents

Abstract

The present invention relates to a novel in vivo liquid injection device comprising: a main body and an internal containing space, wherein the front end of the main body is provided with a spraying part; a piston inserted into the accommodating space through the opening portion and capable of moving forward and backward, and pressing the liquid to be ejected from the ejection portion when moving forward; a seal member having elasticity and disposed at a front end of the piston; the front end of the piston is provided with a cross bone position, the cross bone position is provided with a protrusion, the sealing element is provided with a hollow part, the front end of the hollow part is closed, the rear end of the hollow part is opened, and the hollow part is detachably clamped and sleeved on the cross bone position through the protrusion; when the piston moves forwards, the sealing element moves to the front end of the accommodating space, and when the piston moves backwards again, the sealing element overcomes the clamping position of the protrusion through the friction force between the sealing element and the inner wall of the accommodating space so as to be separated from the piston. The utility model realizes the promotion and optimization of the sealing effect and the separation effect of the sealing element after the piston moves forwards.

Description

Novel in vivo liquid injection device

Technical Field

The utility model relates to the technical field of liquid injection instruments, in particular to a novel in-vivo liquid injection device which is used for injecting medical liquid and gel.

Background

Currently, for certain medical applications, it is desirable to use an instrument to infuse fluids into the body.

Prior art chinese invention patent utility model publication No. CN103619376A discloses a body fluid injection device with a detachable sealing member, comprising: a main body having an accommodating space for accommodating a liquid and a first protrusion exposed to the accommodating space formed therein, a discharge portion formed at a front end thereof for discharging the liquid accommodated in the accommodating space, and an open rear end; a piston inserted into the receiving space through the opened rear end of the body and capable of moving forward and backward, and ejecting the liquid received in the receiving space when moving forward; a sealing member having elasticity and having a hollow portion, disposed at a front end of the piston to prevent the liquid received in the receiving space from leaking from a rear side of the body, the sealing member moving to a front side of the first protrusion when the piston moves forward, the sealing member being separated from the piston by the first protrusion when the piston moves backward again. The above-described prior art has primarily designed the liquid injector as a non-reusable structure, as a disposable device, to reduce the risk of disease and bacterial infection that would otherwise result from repeated use.

However, the above prior art mainly has the following disadvantages: the main body structure is designed more complicated, the forming difficulty of the first bulge is high in the injection molding processing, and the manufacturing cost is high; the sealing element adopts an annular sealing ring structure, so that the sealing effect of the sealing element on the storable liquid is required to be improved.

Disclosure of Invention

The present invention is directed to provide a novel in vivo liquid injection device, which overcomes the above-mentioned shortcomings of the prior art.

The embodiment of the utility model provides a novel in-vivo liquid injection device, which comprises: a main body having an accommodating space formed therein for accommodating a liquid, a discharge portion formed at a front end thereof for discharging the liquid in the accommodating space, and an open portion formed at a rear end thereof; a piston which is inserted into the containing space through the opening part and can move back and forth, and extrudes the liquid contained in the containing space when moving forward so as to spray from the spraying part; a sealing member having elasticity and disposed at a front end of the piston to prevent the liquid contained in the containing space from leaking from a rear side of the body; the front end of the piston is provided with a cross bone position, one relative bone position is provided with a relative protrusion, the sealing element is provided with a hollow part, the front end of the hollow part is closed, the rear end of the hollow part is opened, and the hollow part is detachably clamped and sleeved on the cross bone position through the protrusion; when the piston moves forwards, the sealing element moves to the front end of the accommodating space, and when the piston moves backwards again, the sealing element overcomes the clamping position of the protrusion through the friction force between the sealing element and the inner wall of the accommodating space so as to be separated from the piston.

In some of these embodiments, the protrusions are rounded protrusions.

In some embodiments, the hollow part comprises an inner cavity for clamping the protrusion, an outer cavity with an inner diameter smaller than that of the inner cavity and sleeved on the periphery of the cross bone position, and a horn-shaped counter bore forming a rear end opening in sequence from inside to outside, and the protrusion is clamped in the inner cavity.

In some of these embodiments, the rear portion of the outer side of the seal has a first outer side with a larger outer diameter and the front portion has a second outer side with a smaller outer diameter.

In some of these embodiments, the front face of the sealing member has a protrusion that closes the front end of the hollow portion, and the front face of the cross bone is spaced a distance from the front end of the hollow portion.

In some of the embodiments, the rear end of the piston has a pressing portion, and the rear end face of the pressing portion has a function insertion hole.

In some embodiments, the inner diameter of the front end of the accommodating space gradually narrows to the ejection part.

In some embodiments, the device further comprises an end cover, wherein the end cover is provided with an outer sealing convex ring which is in contact with the ejection part to play a sealing effect.

In some of these embodiments, the spouting portion has an inner seal convex ring which has a sealing effect by contacting with the cap.

Compared with the related art, the novel in-vivo liquid injection device provided by the embodiment of the utility model comprises: a main body having an accommodating space formed therein for accommodating a liquid, a discharge portion formed at a front end thereof for discharging the liquid in the accommodating space, and an open portion formed at a rear end thereof; a piston which is inserted into the containing space through the opening part and can move back and forth, and extrudes the liquid contained in the containing space when moving forward so as to spray from the spraying part; a sealing member having elasticity and disposed at a front end of the piston to prevent the liquid contained in the containing space from leaking from a rear side of the body; the front end of the piston is provided with a cross bone position, one relative bone position is provided with a relative protrusion, the sealing element is provided with a hollow part, the front end of the hollow part is closed, the rear end of the hollow part is opened, and the hollow part is detachably clamped and sleeved on the cross bone position through the protrusion; when the piston moves forwards, the sealing element moves to the front end of the accommodating space, and when the piston moves backwards again, the sealing element overcomes the clamping position of the protrusion through the friction force between the sealing element and the inner wall of the accommodating space so as to be separated from the piston. The structure of the accommodating space of the main body is simplified, the manufacturing difficulty and cost are reduced, the assembly of the sealing element and the piston and the structure of the sealing element are optimized, the improvement and optimization of the sealing effect and the separation effect of the sealing element after the piston moves forwards are realized, and the problems that the structural design of the main body is complex, the molding difficulty of the first protrusion is high in the injection molding processing, and the manufacturing cost is high in the prior art are solved; the sealing element adopts an annular sealing ring structure, so that the sealing effect of the sealing element on the storable liquid is required to be improved.

The details of one or more embodiments of the utility model are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the utility model.

Drawings

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

fig. 1 is an assembled configuration view of a novel in-vivo liquid injection device according to an embodiment of the present invention.

Fig. 2 is an exploded structural view of the novel in-vivo liquid injection device according to the embodiment of the present invention.

FIG. 3 is a sectional view showing the structure of the novel in-vivo liquid injection device according to the embodiment of the present invention.

Fig. 4 is an enlarged structural view of a portion a in fig. 3.

Fig. 5 is an enlarged structural view of a portion B in fig. 3.

FIG. 6 is a block diagram of a seal according to an embodiment of the present invention.

In the figure, 1, main body; 2. an accommodating space; 3. a discharge section; 4. an opening part; 5. a piston; 6. a seal member; 7. a cross bone position; 8. a protrusion; 9. an ejection port; 10. a main body position; 11. a long rod; 12. a hollow part; 13. an inner cavity; 14. an outer cavity; 15. a horn-shaped counter bore; 16. a first outer side; 17. a second outer side; 18. a protrusion; 19. a gap; 20. a pressing part; 21. a functional jack; 22. an end cap; 23. an outer sealing convex ring; 24. an inner sealing convex ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments provided by the present invention, belong to the protection scope of the present invention. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the utility model. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one of ordinary skill in the art that the described embodiments of the present invention can be combined with other embodiments without conflict.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the terms "a" and "an" and "the" and similar referents in the context of describing the utility model are not to be construed as limiting in number, and may be construed to cover both the singular and the plural. The present invention relates to the terms "comprises," "comprising," "includes," "including," "has," "having" and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in the description of the utility model are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means two or more. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. The terms "first," "second," "third," and the like in reference to the present invention are used merely to distinguish between similar objects and not necessarily to represent a particular ordering for the objects.

As shown in fig. 1 to 6, a novel in-vivo liquid injection device comprises: a main body 1 having an accommodating space 2 formed therein for accommodating a liquid, a discharge portion 3 formed at a front end of the main body 1 for discharging the liquid in the accommodating space 2, and an open portion 4 formed at a rear end of the main body 1; a piston 5 which is inserted into the housing space 2 through the opening 4 and can move forward and backward, and which, when moving forward, presses the liquid housed in the housing space 2 to eject the liquid from the ejection section 3; a seal 6 having elasticity and disposed at a front end of the piston 5 to prevent the liquid contained in the containing space 2 from leaking from a rear side of the body 1; wherein, the front end of the piston 5 has a cross bone position 7, one of the opposite bone positions is provided with an opposite protrusion 8, the sealing element 6 has a hollow part 12, the front end of the hollow part 12 is closed, the rear end is opened, the hollow part 12 can be detachably clamped and sleeved on the cross bone position 7 through the protrusion 8; when the piston 5 moves forward, the sealing member 6 moves to the front end of the accommodating space 2, and when the piston 5 moves backward again, the sealing member 6 overcomes the catching position of the protrusion 8 by the friction force with the inner wall of the accommodating space 2 to be disengaged from the piston 5. The main body 1 is a hollow tube with a long axis, the hollow part is the above-mentioned containing space 2, the open part 4 is a normal part of the injector, it is convenient to clamp and support the main body 1 with fingers during operation, the ejection part 3 has a thin ejection port 9. Wherein, the piston 5 has a long shaft structure, the front end body 1 is a cross-shaped body 1 bone position which is the same as the cross bone position 7, and the cross bone position 7 of the front end of the piston 5 is formed at the front end of the body 1 bone position; the rear end main body 1 is a long rod 11; the front end structure of the piston 5 is mainly modified in the embodiment, and better sealing and separation effects are realized by arranging the protrusion 8 and matching with the sealing member 6 with the modified structure. The cross rib 7 is composed of a first member extending in the vertical direction and a second member extending in the left-right direction, the extension lengths of the first member and the second member may be uniform or nonuniform, the protrusion 8 is disposed on the outer end surface of the member having the largest extension length, and the cross rib 7 is fitted to the seal member 6, so that the contact surface between the piston 5 and the seal member 6 can be reduced, and the separation of the seal member 6 can be facilitated. The above-mentioned up-down direction and left-right direction are opposite, and are not limited.

In the embodiment of the present invention, in order to reduce the friction force between the protrusion 8 and the sealing member 6 and reduce the interference therebetween, or in order to make the sealing member 6 separate from the piston 5, the protrusion 8 is configured as a circular arc protrusion, the circular arc protrusion surface is a curved surface, the contact area with the inner cavity 13 of the hollow portion 12 is small, and the friction force and the interference are also small, which facilitates the separation of the sealing member 6.

In the embodiment of the utility model, the hollow part 12 comprises an inner cavity 13 for clamping the protrusion 8, an outer cavity 14 which is smaller than the inner cavity 13 in inner diameter and is sleeved on the periphery of the cross bone position 7, and a horn-shaped counter bore 15 which forms a rear end opening in sequence from inside to outside, and the protrusion 8 is clamped in the inner cavity 13. Since the seal 6 has a half-wrapped structure, the seal is more tightly sealed against the housing space 2, and does not easily leak like a gasket. As can be seen, the inner cavity 13 and the outer cavity 14 are straight cavities, and the intersection forms a right angle, so that the contact area of the right angle and the protrusion 8 is small, and the detachment of the sealing member 6 is facilitated. The provision of the flared counterbore 15 reduces the axial length of the outer chamber 14, thereby reducing the contact surface of the seal 6 with the cruciate bone site 7 and further facilitating disengagement of the seal 6.

In the embodiment of the present invention, in order to improve the sealing effect and the separation effect, in order to prevent an excessive frictional force between the sealing member 6 and the inner wall of the body 1 during the advance of the piston 5, the sealing member 6 is disposed such that the rear portion of the outer side surface has the first outer side surface 16 having a large outer diameter and the front portion has the second outer side surface 17 having a small outer diameter. The friction force between the sealing element 6 and the inner wall of the main body 1 is mainly concentrated on the first outer side surface 16 in the forward moving process of the sealing element 6, and the friction force between the second outer side surface 17 and the inner wall of the main body 1 is smaller than the friction force between the first outer side surface 16 and the inner wall of the main body 1, so that the defect that the piston 5 cannot move smoothly forward due to the fact that the friction force between the outer side surface of the straight cylinder shape and the inner wall of the main body 1 is too large can be avoided.

In the embodiment of the utility model, the front end surface of the sealing member 6 has a protrusion 18 closing the front end of the hollow portion 12, and the front end surface of the cross bone 7 is spaced from the front end of the hollow portion 12 by a certain distance and forms a gap 19. After the piston 5 is moved forward, the sealing member 6 is also moved forward, the protrusion 18 of the front end surface of the sealing member 6 contacts with the front end inner bottom of the housing space 2 and is pressed by the inner bottom under the compression of the piston 5, so that the protrusion 18 is depressed to reduce the gap 19, and the second outer side surface 17 on the outer side surface of the sealing member 6 is pressed toward the periphery by interference in the state that the protrusion 18 is pressed and compressed, thereby increasing the friction force between the sealing member 6 and the inner wall of the body 1 to facilitate the separation of the sealing member 6 from the piston 5 during the backward movement of the piston 5.

In the embodiment of the present invention, the rear end of the piston 5 has a pressing portion 20, the rear end surface of the pressing portion 20 has a function insertion hole 21, the pressing portion 20 is disposed at the rear end of the rod 11, and the function insertion hole 21 is used for cooperating with another tool to realize other functions.

In the embodiment of the present invention, the inner diameter of the front end of the housing space 2 gradually narrows toward the discharge portion 3, and after the piston 5 drives the seal 6 to advance toward the discharge portion 3, a greater pressure is applied to the seal 6 at the narrowed portion to facilitate the separation of the seal 6.

In the embodiment of the present invention, an end cap 22 is further included, the end cap 22 has an outer sealing convex ring 23 which contacts with the ejection part 3 to perform a sealing effect, and correspondingly, the ejection part 3 has an inner sealing convex ring 24 which contacts with the end cap 22 to perform a sealing effect. As can be seen from the figure, the outer sealing convex rings 23 are arranged in two along the axial direction of the end cover 22, while the inner sealing convex ring 24 is arranged in one, after the end cover 22 is assembled in place, the outer sealing convex ring 23 is positioned at the rear side of the inner sealing convex ring 24, and the arrangement of the outer sealing convex ring 23 and the inner sealing convex ring 24 firstly can enable the end cover 22 to be sealed with the bracket of the spouting portion 3 and secondly can fix the assembling position of the end cover 22 on the spouting portion 3; of course, the end cap 22 needs to be opened before filling is performed to make it available for use.

The working principle of the embodiment of the utility model is as follows: before injection, the end cap 22 is detached from the ejection part 3 and opened, the piston 5 moves forward after being stressed by the pressure applying part 20, the sealing member 6 is carried forward in the process of forward movement of the piston 5, and the liquid contained in the containing space 2 is ejected from the ejection port 9 of the ejection part 3 in the process of forward movement of the sealing member 6; after the piston 5 moves forward to the stroke limit position, the sealing member 6 reaches the front side of the ejection portion 3 in the housing space 2 and comes into close contact with the ejection portion 3, and at this time, the piston 5 moves backward, and the sealing member 6 is separated from the front end of the piston 5 against the cross bone 7 and the protrusion 8 at the front end of the piston 5 by the frictional force between the sealing member and the inner wall of the housing space 2.

Compared with the prior art, the novel in-vivo liquid injection device provided by the embodiment of the utility model comprises: a main body 1 having an accommodating space 2 formed therein for accommodating a liquid, a discharge portion 3 formed at a front end of the main body 1 for discharging the liquid in the accommodating space 2, and an open portion 4 formed at a rear end of the main body 1; a piston 5 which is inserted into the housing space 2 through the opening 4 and can move forward and backward, and which, when moving forward, presses the liquid housed in the housing space 2 to eject the liquid from the ejection section 3; a seal 6 having elasticity and disposed at a front end of the piston 5 to prevent the liquid contained in the containing space 2 from leaking from a rear side of the body 1; wherein, the front end of the piston 5 has a cross bone position 7, one of the opposite bone positions is provided with an opposite protrusion 8, the sealing element 6 has a hollow part 12, the front end of the hollow part 12 is closed, the rear end is opened, the hollow part 12 can be detachably clamped and sleeved on the cross bone position 7 through the protrusion 8; when the piston 5 moves forward, the sealing member 6 moves to the front end of the accommodating space 2, and when the piston 5 moves backward again, the sealing member 6 overcomes the catching position of the protrusion 8 by the friction force with the inner wall of the accommodating space 2 to be disengaged from the piston 5. The structure of the accommodating space 2 of the main body 1 is simplified, the manufacturing difficulty and cost are reduced, the assembly of the sealing element 6 and the piston 5 and the structure of the sealing element 6 are optimized, the sealing effect and the separation effect of the sealing element 6 after the piston 5 moves forwards are improved and optimized, and the problems that the structural design of the main body 1 is complex, the forming difficulty of the first protrusion 8 is high in injection molding processing and the manufacturing cost is high in the prior art are solved; the sealing element 6 adopts an annular sealing ring structure, so that the sealing effect on the storable liquid is required to be improved.

It should be understood by those skilled in the art that various features of the above-described embodiments can be combined in any combination, and for the sake of brevity, all possible combinations of features in the above-described embodiments are not described in detail, but rather, all combinations of features which are not inconsistent with each other should be construed as being within the scope of the present disclosure.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. A novel in vivo liquid injection device comprising:

a main body (1) having an accommodating space (2) formed therein for accommodating a liquid, a discharge portion (3) formed at a front end of the main body (1) for discharging the liquid in the accommodating space (2), and an open portion (4) formed at a rear end of the main body (1);

a piston (5) which is inserted into the housing space (2) through the opening portion (4) and can move forward and backward, and which, when moving forward, presses the liquid housed in the housing space (2) and ejects the liquid from the ejection portion (3);

a seal (6) having elasticity and disposed at the front end of the piston (5) to prevent the liquid contained in the containing space (2) from leaking from the rear side of the main body (1);

the sealing element is characterized in that the front end of the piston (5) is provided with a cross bone position (7), an opposite protrusion (8) is arranged at one opposite bone position, the sealing element (6) is provided with a hollow part (12), the front end of the hollow part (12) is closed, the rear end of the hollow part is opened, and the hollow part (12) is detachably clamped and sleeved on the cross bone position (7) through the protrusion (8); when the piston (5) moves forwards, the sealing element (6) moves to the front end of the accommodating space (2), and when the piston (5) moves backwards again, the sealing element (6) overcomes the clamping position of the protrusion (8) through the friction force between the sealing element and the inner wall of the accommodating space (2) to be separated from the piston (5).

2. A novel in vivo liquid injection device according to claim 1, wherein said protrusion (8) is a rounded protrusion.

3. A new intracorporeal liquid injection device according to claim 2, wherein said hollow portion (12) comprises, in order from inside to outside, an inner cavity (13) for retaining said protrusion (8), an outer cavity (14) having an inner diameter smaller than said inner cavity (13) and fitted around the periphery of said cruciate bone site (7), and a trumpet-shaped counter bore (15) forming said rear end opening, said protrusion (8) being retained in said inner cavity (13).

4. A new in-vivo liquid injection device, according to claim 3, characterized in that the outer side of said sealing element (6) has a first outer side (16) with a larger outer diameter at the rear and a second outer side (17) with a smaller outer diameter at the front.

5. A new in-vivo liquid injection device according to claim 1, characterized in that the front end face of said sealing member (6) has a protrusion (18) closing the front end of said hollow portion (12), and the front end face of said cross bone site (7) is at a distance from the front end of said hollow portion (12).

6. The new in-vivo liquid injection device according to claim 1, wherein the rear end of the piston (5) has a pressing portion (20), and the rear end face of the pressing portion (20) has a function insertion hole (21).

7. The device for injecting a liquid into the body as claimed in claim 1, wherein the inner diameter of the front end of said housing space (2) is gradually narrowed toward said ejection portion (3).

8. A novel in-vivo liquid injection device according to claim 1, further comprising an end cap (22), said end cap (22) having an outer sealing convex ring (23) which has a sealing effect in contact with said spouting portion (3).

9. The device according to claim 8, wherein the spouting portion (3) has an inner seal convex ring (24) having a sealing effect in contact with the end cap (22).

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