Connected device with a dead space and infusion device including the same

Abstract

The present invention discloses a connecting device with a dead space and an infusion device including the same. The connecting device with a dead space includes a housing; a connecting cavity and a flow channel, the connecting cavity and the flow channel are formed inside the housing, and the connecting cavity communicates with the flow channel; a switch, the switch moves along the axial direction of the connecting cavity to open or close the flow channel; a dead space, the dead space is formed at the axial end of the connecting cavity, and the switch is restricted by the connecting cavity to prevent it from entering the dead space. The present invention limits the position so that the switch will not enter the dead space. Due to the existence of the dead space, the end of the switch will not directly contact the inner wall of the housing, thus forming a space between the end of the switch and the inner wall of the housing to accommodate air. Therefore, when the switch is moved, the air pressure on both sides of the switch can be balanced to a certain extent, thereby reducing the resistance of the switch and avoiding the situation where the switch is locked in the initial state.

Description

Technical Field

[0001] The present invention relates to a connecting device with a dead space and an infusion device including the same. Background Art

[0002] In the prior art, for example, in an infusion device, a connecting device that can switch the flow channel between open and closed states is required. Usually, the initial state of these connecting devices is the state of closing the flow channel. At this time, due to the very large resistance generated by the external negative pressure, and if there is silicone oil between the switch of the connecting device and the housing, adhesion will occur, resulting in the problem that the connecting device cannot be opened. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defect that it is very difficult or even impossible to open the connecting device from the initial state in the prior art, and to provide a connecting device with a dead space and an infusion device including the same.

[0004] The present invention solves the above technical problem by the following technical solutions:

[0005] A connecting device with a dead space, characterized in that the connecting device with a dead space includes:

[0006] A housing;

[0007] A connecting cavity and a flow channel, the connecting cavity and the flow channel are formed inside the housing, and the connecting cavity communicates with the flow channel;

[0008] A switch, the switch moves along the axial direction of the connecting cavity to open or close the flow channel;

[0009] A dead space, the dead space is formed at the axial end of the connecting cavity, and the switch is restricted by the connecting cavity to prevent it from entering the dead space.

[0010] In this solution, the switch is prevented from entering the dead space by limiting. Thus, in any state, the end of the switch is at least separated from the dead space. Due to the existence of the dead space, the end of the switch will not directly contact the inner wall of the housing, so that a space is formed between the end of the switch and the inner wall of the housing to accommodate air. Therefore, when the switch is moved, the air pressures on both sides of the switch can be balanced to a certain extent, thereby reducing the resistance of the switch and avoiding the situation where the switch is locked in the initial state.

[0011] Preferably, a blocking step is formed at the junction of the dead space and the connecting cavity, and the blocking step is used to block the end of the switch to limit the switch from entering the dead space. The blocking step can be integrally formed with the housing, which is convenient for processing. At the same time, the blocking step has a stable limiting effect.

[0012] Preferably, the dead volume is formed by partial convex structures on the inner wall of the housing contacting the switch part; or the dead volume is formed by partial convex structures on the end surface of the switch contacting a part of the inner wall of the housing. Thus, the dead volume is formed at the gaps of the convex structures through partial contact.

[0013] Preferably, the switch moves axially in the communication cavity by rotating itself. Of course, the switch can also move axially in the communication cavity by any motion mode.

[0014] Preferably, the switch moves axially along the communication cavity between an initial position and a final position. Wherein, at the initial position, the switch closes the flow channel; at the final position, the switch opens the flow channel.

[0015] Preferably, the initial position is closer to the dead volume than the final position. Wherein, at the initial position, the end of the switch is separated from the housing by the dead volume.

[0016] Preferably, the switch includes a blocking part that moves in the communication cavity to open or close the flow channel.

[0017] Preferably, a convex ring is formed on the surface of the blocking part, and a concave ring is formed on the inner wall of the communication cavity. The convex ring and the concave ring cooperate to seal the gap between the inner wall of the communication cavity and the blocking part. The cooperation of the convex ring and the concave ring can increase the tightness of the cooperation, thereby preventing liquid leakage.

[0018] Preferably, two convex rings are formed on the surface of the blocking part, and at least three concave rings are provided on the inner wall of the communication cavity. Wherein, at the initial position, the two convex rings are respectively located on both sides of the flow channel; at the final position, the two convex rings are both located on one side of the flow channel. At the initial position, the two convex rings close on both sides, so that the liquid at the front end of the flow channel cannot flow into the rear end of the flow channel through the communication cavity. At the final position, the communication between the flow channel and the communication cavity is no longer blocked, which can ensure the continuous flow of liquid. At the same time, the convex ring on one side can also prevent the liquid from flowing out from the side.

[0019] Preferably, the number of the convex rings is two, and the number of the concave rings is three. Wherein, the interval distance between adjacent concave rings is the same as the interval distance between the two convex rings. By using three equally spaced concave rings, the number of concave rings can be limited to the greatest extent while ensuring the cooperation between the convex rings and the concave rings at the initial position and the final position, thereby reducing the extension distance of the communication cavity, further reducing the size of the housing and the size of the communication device with a dead volume.

[0020] Preferably, one side of the flow channel is provided with one of the concave rings, and the other side of the flow channel is provided with two of the concave rings.

[0021] Preferably, the material of the blocking portion is a flexible material. The material of the blocking portion can further be materials such as rubber or silica gel, thereby achieving a better sealing effect.

[0022] Preferably, the switch further includes a handle portion, the handle portion is directly or indirectly connected to the blocking portion, and the handle portion is located outside the housing. During operation, the blocking portion in the communication cavity can be directly moved through the handle portion, which is convenient for use.

[0023] Preferably, the switch further includes a connecting shaft, and the connecting shaft passes through the communication cavity to connect the blocking portion and the handle portion.

[0024] Preferably, the connecting shaft is provided with claws that open towards the blocking portion, and a limiting step is formed on the inner wall of the communication cavity. Among them, in the final position, the limiting step blocks the claws to prevent the switch from moving towards the initial position. The opening direction of the claws enables them to catch the limiting step in the final position to prevent the switch from retracting.

[0025] Preferably, the housing has a protruding cylindrical end, and the handle portion has a surrounding circumferential side wall. In the initial position, the inner side of the circumferential side wall is in threaded cooperation with the cylindrical end. The threaded cooperation method in the initial position can prevent the switch from being accidentally touched and opened.

[0026] An infusion device, characterized in that it includes the communication device with a dead space.

[0027] The positive and progressive effects of the present invention are as follows: The present invention limits the switch so that it does not enter the dead space. Thus, in any state, the end of the switch is at least separated from the dead space. Due to the existence of the dead space, the end of the switch does not directly contact the inner wall of the housing, thereby forming a space between the end of the switch and the inner wall of the housing to accommodate air. Therefore, when the switch is moved, the air pressures on both sides of the switch can be balanced to a certain extent, thereby reducing the resistance of the switch and avoiding the situation where the switch is locked in the initial state. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the internal structure of the housing of a preferred embodiment of the present invention.

[0029] Figure 2 is Figure 1 The enlarged structural schematic diagram of part A in

[0030] Figure 3 is Figure 1Schematic diagram of the enlarged structure of part B in

[0031] Figure 4 Schematic diagram of the structure of the blocking part of a preferred embodiment of the present invention.

[0032] Figure 5 Schematic diagram of the internal structure of a preferred embodiment of the present invention in the initial position.

[0033] Figure 6 Schematic diagram of the internal structure of a preferred embodiment of the present invention in the final position.

[0034] Figure 7 is Figure 6 Schematic diagram of the enlarged structure of part A in

[0035] Figure 8 Front view schematic diagram of the first embodiment of the convex structure of a preferred embodiment of the present invention.

[0036] Figure 9 Side view schematic diagram of the first embodiment of the convex structure of a preferred embodiment of the present invention.

[0037] Figure 10 Front view schematic diagram of the second embodiment of the convex structure of a preferred embodiment of the present invention.

[0038] Figure 11 Side view schematic diagram of the second embodiment of the convex structure of a preferred embodiment of the present invention.

[0039] Figure 12 Front view schematic diagram of the third embodiment of the convex structure of a preferred embodiment of the present invention.

[0040] Figure 13 Side view schematic diagram of the third embodiment of the convex structure of a preferred embodiment of the present invention. Detailed implementation manners

[0041] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the described embodiments.

[0042] As Figures 1 - 7 shown, this embodiment discloses a communication device with a dead space, including a housing 1, a communication cavity 2, a dead space 3, a flow channel 4, and a switch 5.

[0043] As Figure 1 , Figure 2 and Figure 3As shown, the connecting device with a dead space in this embodiment includes a housing 1. The housing 1 can be processed by various processes such as injection molding. Among them, the cavity inside the housing 1 forms a connecting cavity 2 and a flow channel 4. The connecting cavity 2 and the flow channel 4 are formed inside the housing 1, and the connecting cavity 2 and the flow channel 4 communicate with each other. As Figure 1 shown, in this embodiment, the flow channel 4 vertically intersects and communicates with the connecting cavity 2. Therefore, the flow channel 4 can be blocked by blocking the through hole where the flow channel 4 vertically intersects with the connecting cavity 2.

[0044] As Figure 4 、 Figure 5 and Figure 6 shown, the connecting device with a dead space in this embodiment includes a switch 5. The switch 5 moves along the axial direction of the connecting cavity 2 to open or close the flow channel 4. The switch 5 is preferably in a cylindrical shape as a whole in this embodiment to facilitate rotation.

[0045] As Figure 1 、 Figure 5 and Figure 6 shown, the connecting device with a dead space in this embodiment includes a dead space 3. The dead space 3 is formed at the axial end of the connecting cavity 2. The switch 5 is restricted by the connecting cavity 2 to prevent it from entering the dead space 3. The dead space 3 here is a physically existing space formed by the structural setting and is not affected by the movement of the switch 5. It still exists even when the switch 5 is in the most extreme close state.

[0046] In this solution, the switch 5 is prevented from entering the dead space 3 through limiting. Thus, in any state, the end of the switch 5 is at least separated from the dead space 3. Due to the existence of the dead space 3, the end of the switch 5 will not directly contact the inner wall of the housing 1, so a space is formed between the end of the switch 5 and the inner wall of the housing 1 to accommodate air. Therefore, when the switch 5 is moved, the air pressure on both sides of the switch 5 can be balanced to a certain extent, thereby reducing the resistance of the switch 5 and avoiding the situation where the switch 5 is locked in the initial state.

[0047] As Figure 1 and Figure 2 shown, a blocking step 11 is formed at the junction of the dead space 3 and the connecting cavity 2 in this embodiment. The blocking step 11 is used to block the end of the switch 5 to limit the switch 5 from entering the dead space 3. The blocking step 11 can be integrally formed with the housing 1, which is convenient for processing. At the same time, the blocking step 11 has a stable limiting effect.

[0048] In this embodiment, the switch 5 moves axially in the connecting cavity 2 by rotating itself. Of course, the switch 5 can also achieve axial movement in the connecting cavity 2 through any movement method.

[0049] As Figure 5 and Figure 6As shown, the switch 5 of this embodiment moves along the axial direction of the communicating cavity 2 between Figure 5 an initial position shown in Figure 6 and a final position shown in

[0050] As shown in Figure 5 and Figure 6 the initial position is closer to the dead space 3 than the final position, where at the initial position, the end of the switch 5 is separated from the housing 1 by the dead space 3. Without being affected by the extreme conditions of the movement of the switch 5.

[0051] As shown in Figure 4 , Figure 5 and Figure 6 the switch 5 of this embodiment includes a blocking portion 51, and the blocking portion 51 moves within the communicating cavity 2 to open or close the flow channel 4. The blocking portion 51 of this embodiment is generally cylindrical or other rotary body shape to facilitate rotation and processing.

[0052] As shown in Figure 1 , Figure 4 , Figure 5 and Figure 6 a protruding convex ring 511 is formed on the surface of the blocking portion 51 of this embodiment, and a concave ring 14 is formed on the inner wall of the communicating cavity 2, and the convex ring 511 cooperates with the concave ring 14 to seal the gap between the inner wall of the communicating cavity 2 and the blocking portion 51. The cooperation of the convex ring 511 and the concave ring 14 can increase the tightness of the cooperation, thereby preventing the leakage of liquid.

[0053] As shown in Figure 1 , Figure 4 , Figure 5 and Figure 6 two convex rings 511 are formed on the surface of the blocking portion 51 of this embodiment, and at least three concave rings 14 are provided on the inner wall of the communicating cavity 2, where at the initial position, the two convex rings 511 are respectively located on both sides of the flow channel 4; at the final position, the two convex rings 511 are both located on one side of the flow channel 4. At the initial position, the two convex rings 511 are closed on both sides so that the liquid at the front end of the flow channel 4 cannot flow into the rear end of the flow channel 4 through the communicating cavity 2. At the final position, the communication between the flow channel 4 and the communicating cavity 2 is no longer blocked, which can ensure the continuous flow of liquid, and at the same time, the convex ring 511 on one side can also prevent the liquid from flowing out from the side.

[0054] As shown in Figure 1 , Figure 4 , Figure 5 and Figure 6As shown, the number of convex rings 511 in this embodiment is two, and the number of concave rings 14 is three. Among them, the spacing distance between adjacent concave rings 14 is the same as the spacing distance between the two convex rings 511. By using three equally spaced concave rings 14, while ensuring that the convex rings 511 and the concave rings 14 can cooperate both in the initial position and the final position, the number of concave rings 14 is limited to the greatest extent, thereby reducing the extension distance of the communication cavity 2, and further reducing the size of the housing 1 and the size of the communication device with a dead cavity.

[0055] As Figure 1 shown, one concave ring 14 is provided on one side of the flow channel 4 in this embodiment, and two concave rings 14 are provided on the other side of the flow channel 4.

[0056] In this embodiment, the material of the blocking portion 51 is a flexible material. The material of the blocking portion 51 can further be materials such as rubber or silica gel, thereby achieving a better sealing effect.

[0057] As Figure 5 、 Figure 6 and Figure 7 shown, the switch 5 in this embodiment further includes a handle portion 52. The handle portion 52 is directly or indirectly connected to the blocking portion 51, and the handle portion 52 is located outside the housing 1. During operation, the blocking portion 51 in the communication cavity 2 can be directly moved through the handle portion 52, which is convenient for use.

[0058] As Figure 4 、 Figure 5 、 Figure 6 and Figure 7 shown, the switch 5 in this embodiment further includes a connecting shaft 53. The connecting shaft 53 passes through the communication cavity 2 to connect the blocking portion 51 and the handle portion 52.

[0059] As Figure 6 and Figure 7 shown, the connecting shaft 53 in this embodiment is provided with claws 54 that open towards the blocking portion 51. A limiting step 12 is formed on the inner wall of the communication cavity 2. Among them, in the final position, the limiting step 12 blocks the claws 54 to prevent the switch 5 from moving towards the initial position. The opening direction of the claws 54 enables it to catch the limiting step 12 in the final position to prevent the switch 5 from retracting.

[0060] As Figure 6 and Figure 7 shown, the housing 1 of this embodiment has a protruding cylindrical end 13, and the handle portion 52 has a surrounding circumferential side wall 521. In the initial position, the inner side of the circumferential side wall 521 is in threaded fit with the cylindrical end 13. The threaded fit can prevent the switch 5 from being accidentally touched and opened in the initial position.

[0061] In this embodiment, the dead space 3 can also be formed by partial contact between a partial convex structure on the inner wall of the housing 1 and the switch 5; or the dead space 3 is formed by partial contact between a partial convex structure on the end surface of the switch 5 and the inner wall of the housing 1. Thus, the dead space is formed at the gap of the convex structure through partial contact.

[0062] As Figure 8 and Figure 9 shown, in one of the first embodiments, a plurality of ribbed bars 61 are formed on the inner wall of the housing 1, and only the ribbed bars 61 are in contact with the switch 5. Thus, the dead space 3 is formed at the gap between the ribbed bars 61, and the inner wall of the housing 1 does not directly and completely contact the end of the switch 5. Of course, the ribbed bars 61 can also be provided on the end of the switch 5.

[0063] As Figure 10 and Figure 11 shown, in one of the second embodiments, a plurality of convex points 62 are formed on the inner wall of the housing 1, and only the convex points 62 are in contact with the switch 5. Thus, the dead space 3 is formed at the gap between the convex points 62, and the inner wall of the housing 1 does not directly and completely contact the end of the switch 5. Of course, the convex points 62 can also be provided on the end of the switch 5.

[0064] As Figure 12 and Figure 13 shown, in one of the third embodiments, a plurality of frustums 63 are formed on the inner wall of the housing 1, and only the frustums 63 are in contact with the switch 5. Thus, the dead space 3 is formed at the gap between the frustums 63, and the inner wall of the housing 1 does not directly and completely contact the end of the switch 5. Of course, the frustums 63 can also be provided on the end of the switch 5.

[0065] This embodiment also discloses an infusion device, wherein the infusion device includes a communicating device with a dead space.

[0066] In the present invention, the switch is prevented from entering the dead space through limiting. Thus, in any state, the end of the switch is at least separated by the dead space. Due to the existence of the dead space, the end of the switch does not directly stick to the inner wall of the housing, thereby forming a space between the end of the switch and the inner wall of the housing to accommodate air. Therefore, when the switch is moved, the air pressures on both sides of the switch can be kept balanced to a certain extent, thereby reducing the resistance of the switch and avoiding the situation where the switch is locked in the initial state.

[0067] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only for illustration, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An infusion device, characterized in that, It includes a connecting device with a dead space, and the connecting device with a dead space includes: A housing; A connecting cavity and a flow channel, the connecting cavity and the flow channel are formed inside the housing, and the connecting cavity communicates with the flow channel; A switch that moves axially along the connecting cavity to open or close the flow channel; A dead space formed at the axial end of the connecting cavity, the switch is restricted by the connecting cavity to prevent it from entering the dead space, and the dead space makes the end of the switch not directly contact the inner wall of the housing, so as to form a space for containing air between the end of the switch and the inner wall of the housing.

2. The infusion device according to claim 1, wherein A blocking step is formed at the junction of the dead space and the connecting cavity, and the blocking step is used to block the end of the switch to limit the switch from entering the dead space.

3. The infusion device according to claim 1, wherein, The dead space is formed by partial contact between a partial convex structure on the inner wall of the housing and the switch; or the dead space is formed by partial contact between a partial convex structure on the end surface of the switch and the inner wall of the housing.

4. The infusion device according to claim 1, wherein The switch moves axially in the connecting cavity by rotating itself.

5. The infusion device according to claim 1, characterized in that, The switch moves axially along the connecting cavity between an initial position and a final position. Wherein, in the initial position, the switch closes the flow channel; in the final position, the switch opens the flow channel.

6. The infusion device according to claim 5, characterized in that, The initial position is closer to the dead space than the final position. Wherein, in the initial position, the end of the switch is separated from the housing by the dead space.

7. The infusion device according to claim 6, characterized in that, The switch includes a blocking part that moves in the connecting cavity to open or close the flow channel.

8. The infusion device according to claim 7, wherein, A protruding convex ring is formed on the surface of the blocking part, and a concave ring is formed on the inner wall of the connecting cavity. The convex ring and the concave ring cooperate to close the gap between the inner wall of the connecting cavity and the blocking part.

9. The infusion device according to claim 8, characterized in that, Two convex rings are formed on the surface of the blocking part, and at least three concave rings are arranged on the inner wall of the connecting cavity. Wherein, in the initial position, the two convex rings are respectively located on both sides of the flow channel; in the final position, the two convex rings are both located on one side of the flow channel.

10. The infusion device according to claim 9, characterized in that, The number of convex rings is two, and the number of concave rings is three. The interval distance between adjacent concave rings is the same as the interval distance between the two convex rings.

11. The infusion device according to claim 10, characterized in that, One concave ring is arranged on one side of the flow channel, and two concave rings are arranged on the other side of the flow channel.

12. The infusion device according to claim 7, characterized in that, The material of the blocking part is a flexible material.

13. The infusion device according to any one of claims 7 to 12, characterized in that, The switch further includes a handle part that is directly or indirectly connected to the blocking part, and the handle part is located outside the housing.

14. The infusion device according to claim 13, wherein The switch further includes a connecting shaft that passes through the connecting cavity to connect the blocking part and the handle part.

15. The infusion device according to claim 14, wherein, Claws that open towards the blocking part are arranged on the connecting shaft, and a limiting step is formed on the inner wall of the connecting cavity. Wherein, in the final position, the limiting step blocks the claws to prevent the switch from moving towards the initial position.

16. The infusion device according to claim 13, characterized in that, The housing has a protruding cylindrical end, and the handle portion has a surrounding circumferential side wall. In the initial position, the inner side of the circumferential side wall is in threaded engagement with the cylindrical end.

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