CN117653798A - Negative pressure source assembly, negative pressure pump and negative pressure suction pump assembly - Google Patents

Abstract

The invention discloses a negative pressure source component, a negative pressure pump and a negative pressure suction pump component, wherein the negative pressure source component comprises a shell with a mounting cavity, a roller component rotatably arranged in the mounting cavity and a hose penetrating between the roller component and the inner wall of the shell, and the roller component comprises at least two rollers for extruding the hose; the negative pressure source assembly further comprises: the limiting assembly and the limiting structure are matched, the limiting structure is arranged on the shell and/or the roller assembly, the limiting assembly can move relative to the limiting structure, and the relative position of the roller and the hose is changed in the process of moving from the initial position to the end position. The negative pressure source component provided by the invention reduces the influence of the deformation part of the hose on the negative pressure generated by the negative pressure source component, does not cause functional failure of the negative pressure source component in conveying fluid due to the deformation of the hose, and is beneficial to long-term storage of the negative pressure source component.

Description

Negative pressure source assembly, negative pressure pump and negative pressure suction pump assembly

Technical Field

The invention relates to medical equipment, in particular to a negative pressure source assembly, a negative pressure pump and a negative pressure suction pump assembly.

Background

Peristaltic pumps are commonly used as a negative pressure source in medical equipment, the peristaltic pump is driven to have a rotor, a roller rotating with the rotor is arranged on the rotor, the roller rotates along with the rotor relative to the inner wall of a shell and presses a flexible pipe with elasticity, along with the movement of the roller relative to the flexible pipe, fluid in the flexible pipe is stably moved towards an outlet direction, the flexible pipe is pressed and then has resilience, and negative pressure is generated when the pressed part of the flexible pipe is rebounded under the action of the elasticity. Pumping fluid is thus achieved by alternately squeezing and releasing the hose.

However, because the conventional peristaltic pump has the condition that the roller presses the hose for a long time, the hose in the pressed state is easy to deform, and when the roller alternately presses the hose to deform, the resilience force of the hose in the deformed position is weakened, so that the negative pressure is influenced, and the gas or liquid of the conveying pipeline is influenced.

Disclosure of Invention

The invention aims to solve the technical problem that a hose at a position in a squeezing state is easy to deform for a long time, when a roller alternately squeezes the hose at the deformed position, the resilience force of the hose at the deformed position is weakened, the generation of negative pressure is influenced, and the negative pressure source component is provided for overcoming the defects in the prior art.

The invention solves the technical problems by the following technical proposal:

according to a first aspect of the invention, a negative pressure source assembly is provided, comprising a shell with a mounting cavity, a roller assembly rotatably arranged in the mounting cavity, and a hose penetrating between the roller assembly and the inner wall of the shell, wherein the roller assembly comprises at least two rollers for extruding the hose; the negative pressure source assembly further comprises: the limiting assembly and the limiting structure are matched, the limiting structure is arranged on the shell and/or the roller assembly, the limiting assembly can move relative to the limiting structure, and the relative position of the roller and the hose is changed in the process of moving from the initial position to the end position.

In some embodiments of the invention, the roller assembly further comprises: a support base having an axis of rotation; the roller is arranged on the supporting seat and is rotatably sleeved with the roller; the roller is driven by the supporting seat to rotate around the rotating axis of the supporting seat, so that the roller extrudes the hose.

In some embodiments of the present invention, the limiting structure includes a first limiting structure disposed on the support base; the limiting assembly comprises a first limiting part, wherein the first limiting part comprises a pushing part and a connecting part which are connected, and the connecting part is matched with the first limiting structure so that the connecting part can move relative to the first limiting structure; the roller is movably connected with the supporting seat, the roller comprises a main body part for bearing the roller and a matching part facing the first limiting piece, and the matching part is in butt fit with the pushing part; in the process that the first limiting piece moves from the initial position to the end position, the pushing part pushes the matching part to enable the roller to drive the roller to move along the radial direction of the supporting seat.

In some embodiments of the present invention, the first limiting structure includes a cavity formed on the supporting seat, and a first clamping groove and a second clamping groove formed on an inner wall of the cavity, where the first clamping groove is close to the first limiting member relative to the second clamping groove; the connecting part can movably extend into the cavity, and is provided with a clamping hook which can be clamped into the first clamping groove or the second clamping groove; when the clamping hook is positioned in the first clamping groove, the first limiting part is positioned at the initial position, and when the clamping hook is positioned in the second clamping groove, the first limiting part is positioned at the end position.

In some embodiments of the present invention, the support base includes a first support plate and a second support plate disposed in parallel and a rotating shaft connecting the first support plate and the second support plate, and two ends of the main body portion are movably connected to the first support plate and the second support plate, respectively; the rotating shaft is provided with a hollow structure, and the first limiting structure is formed in the hollow structure.

In some embodiments of the present invention, the first support plate and the second support plate are provided with waist-shaped holes, and two ends of the main body part are respectively slidably arranged in the waist-shaped holes of the first support plate and the second support plate; wherein, the cooperation portion passes the waist hole of first backup pad towards the promotion portion stretches out.

In some embodiments of the invention, a side of the pushing part facing the roller is provided with a conical surface; one end of the matching part, which faces the pushing part, is provided with an inclined surface which is in butt joint with the conical surface.

In some embodiments of the invention, at least one end of the body portion has a flat surface that slidingly engages the kidney-shaped aperture.

In some embodiments of the present invention, circular holes are formed in the first support plate and the second support plate; the main body part comprises a straightening section, a first bending section and a second bending section, wherein the first bending section and the second bending section are arranged at two ends of the straightening section, the first bending section is rotatably arranged in a round hole in the first supporting plate, the second bending section is rotatably arranged in a round hole in the second supporting plate, and the matching part is connected with the first bending section; wherein the rotation axis of the bending section in the round hole is in a different plane from the straightening section.

In some embodiments of the invention, the first limiting member further includes a pressing portion connected to the pushing portion, and the pressing portion is located outside the housing.

In some embodiments of the present invention, the limiting structure includes a second limiting structure disposed on the housing, the second limiting structure includes a first sliding portion and a first stop portion, the first sliding portion and the housing define a first slide, the first stop portion is disposed in the first slide, and the first stop portion is provided with a first through hole for the first end of the hose to pass through the mounting cavity; the limiting assembly comprises a second limiting piece which is slidably arranged in the first slideway and connected with the first end of the hose, and the second limiting piece is in stop fit with the first stop part; when the second limiting part is positioned at the initial position, the second limiting part and the first stopping part are separated by a first preset distance, and the roller assembly rotates to enable the roller to drive the hose to move along the periphery of the roller assembly relative to the shell.

In some embodiments of the present invention, the limiting structure further includes a third limiting structure disposed on the housing, the third limiting structure includes a second sliding portion and a second stop portion, the second sliding portion and the housing define a second slideway, the second stop portion is disposed in the second slideway, and the second stop portion is provided with a second through hole for the second end of the hose to pass through the mounting cavity;

the limiting assembly comprises a third limiting piece which is slidably arranged in the second slideway and connected with the second end of the hose, and the third limiting piece is in stop fit with the second stop part; when the third limiting piece is positioned at the initial position, the third limiting piece abuts against the second stop part.

In some embodiments of the present invention, the housing includes an inner wall section having a circular arc shape, and a portion of the hose is disposed between the roller assembly and the inner wall section in a curved shape; the roller rotates along with the roller assembly, and the length of the moving track of the roller is a first length from the contact of the roller with the hose to the separation of the roller from the hose; the length of the first preset interval is larger than the first length.

In some embodiments of the invention, the negative pressure source assembly further comprises: the speed reduction gear assembly comprises a power output end and a power input end, the power input end of the speed reduction gear assembly is in transmission connection with an external driving device, and the power output end is in transmission connection with the roller assembly.

In some embodiments of the present invention, the power output end and the roller assembly are in transmission connection through a ratchet mechanism, wherein the ratchet mechanism comprises a ratchet wheel and a pawl, the ratchet wheel is arranged on one of the power output end and the roller assembly, and the pawl is arranged on the other of the power output end and the roller assembly.

A second aspect of the present invention provides a negative pressure pump, including: a pump housing; the negative pressure source assembly in the first aspect is arranged in the pump shell; the driving device is arranged in the pump shell, and the power output end of the driving device is in transmission connection with the roller component in the negative pressure source component; wherein, first locating part in the negative pressure source subassembly stretches out the pump case.

In some embodiments of the invention, the negative pressure pump further comprises: the power supply is arranged in the pump shell and is electrically connected with the driving device; the power switch is arranged on the outer side surface of the pump shell and is used for controlling the on-off of a circuit connecting the power supply and the driving device.

A third aspect of the present invention provides a negative pressure suction pump assembly comprising: the negative pressure pump in the second aspect is characterized in that an inlet for the pipeline to penetrate and an outlet for the pipeline to penetrate are arranged on a pump shell of the negative pressure pump; a first conduit having a proximal end in communication with a first end of a hose of a negative pressure source assembly in the negative pressure pump through the inlet; a second conduit having a distal end communicating through the outlet with a second end of a hose of a negative pressure source assembly in the negative pressure pump.

In some embodiments of the invention, the negative pressure suction pump assembly further comprises: a liquid collection bag in communication with the proximal end of the second conduit; and/or a flow switch arranged on the first pipeline; and/or a syringe in communication with the first conduit via a T-connector, the syringe being located on a side of the proximal end of the flow switch; and/or a filter is arranged on the first pipeline, and the filter is positioned on one side of the proximal end of the injector.

According to the negative pressure source assembly provided by the embodiment of the invention, the relative position of the roller and the hose is changed by changing the position of the limiting assembly on the limiting structure, so that the roller is prevented from extruding the hose for a long time in the long-term storage process of the negative pressure source assembly, or the deformed hose part moves out of a fixed position contacted with the roller relative to the roller, the influence of the deformed part of the hose on the negative pressure source assembly is reduced, and the functional failure of the negative pressure source assembly for conveying liquid due to the deformation of the hose is prevented even after the negative pressure source assembly is placed for a long time.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 schematically illustrates a schematic construction of a negative pressure source assembly according to one embodiment of the invention;

FIG. 2 schematically illustrates a schematic construction of a negative pressure source assembly in accordance with one embodiment of the invention;

FIG. 3 schematically illustrates a structural exploded view of a negative pressure source assembly of one embodiment of the present invention;

FIG. 4 schematically illustrates a schematic construction of a negative pressure source assembly according to one embodiment of the invention;

FIG. 5 schematically illustrates a schematic structural view of a roller assembly according to one embodiment of the present invention;

Fig. 6 schematically illustrates a schematic structural view of the first stopper and the roller assembly in an initial position state according to an embodiment of the present invention;

fig. 7 schematically illustrates a schematic structural view of the first stopper and the roller assembly in an initial position state according to an embodiment of the present invention;

FIG. 8 schematically illustrates a cross-sectional view of section A-A of FIG. 7;

FIG. 9 schematically illustrates a schematic structural view of the first stopper and roller assembly in a state of the end position of the first stopper according to an embodiment of the present invention;

FIG. 10 schematically illustrates a first stop member and roller assembly configuration in a stop position state according to one embodiment of the present invention;

FIG. 11 schematically illustrates a cross-sectional view of portion B-B of FIG. 10;

fig. 12 schematically shows a structural schematic view of a first support plate of an embodiment of the present invention;

FIG. 13 schematically illustrates a cross-sectional view of a first stop member and roller assembly in accordance with one embodiment of the present invention;

FIG. 14 schematically illustrates a partial structural schematic view of a negative pressure source assembly at a viewing angle in accordance with one embodiment of the present invention;

FIG. 15 schematically illustrates a partial schematic of a negative pressure source assembly in accordance with one embodiment of the invention;

FIG. 16 schematically illustrates a cross-sectional view of the portion C-C of FIG. 14;

FIG. 17 schematically illustrates a cross-sectional view of the second stop and roller assembly with the second stop in an end position in accordance with one embodiment of the present invention;

FIG. 18 schematically illustrates a cross-sectional view of a roller of one embodiment of the present invention from contacting a hose to exiting the hose;

FIG. 19 schematically illustrates a schematic structural view of a negative pressure source assembly from a top view of one embodiment of the invention;

FIG. 20 schematically illustrates a cross-sectional view of portion D-D of FIG. 19;

FIG. 21 schematically illustrates a schematic structural view of a reduction gear assembly of one embodiment of the present invention;

FIG. 22 schematically illustrates a schematic structural view of a support base and reduction gear assembly from a top view of one embodiment of the present invention;

FIG. 23 schematically shows a schematic structural view of a negative pressure pump of an embodiment of the present invention;

fig. 24 schematically shows a structural schematic of a negative pressure suction pump assembly according to an embodiment of the present invention.

The various references in the drawings are as follows:

100-a negative pressure source assembly;

10-a housing, 11-a mounting cavity;

20-roller assemblies, 21-supporting seats, 211-first supporting plates, 212-second supporting plates, 2111-waist-shaped holes, 2112-round holes, 213-rotating shafts, 2131-hollow structures, 214-rotating axes, 22-rollers, 221-main body parts, 2211-straightening sections, 2212-first bending sections, 2213-second bending sections, 222-matching parts, 2221-inclined surfaces and 23-rollers;

30-hose, 31-first end, 32-second end;

40-limiting components, 41-first limiting parts, 411-pressing parts, 412-pushing parts, 4121-conical surfaces, 413-connecting parts, 4131-clamping hooks, 42-second limiting parts and 43-third limiting parts;

51-first limit structure, 511-cavity, 512-first clamping groove, 513-second clamping groove, 52-second limit structure, 521-first sliding part, 5211-first slideway, 522-first stop part, 5221-first through hole and 53-third limit structure;

60-reduction gear assembly, 61-power output, 62-power input, 63-gear;

70-ratchet mechanism, 71-ratchet, 72-pawl;

200-negative pressure pump;

201-pump shell, 202-driving device, 203-power supply, 204-power switch;

300-negative pressure suction pump assembly;

301-first tubing, 302-second tubing, 303-collection bag, 304-flow switch, 305-syringe, 306-T connector, 307-filter.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

It should be noted that "distal end" and "proximal end" are used as terms of orientation, which are terms commonly used in the field of interventional medical devices, where "distal end" refers to an end that is away from an operator during a surgical procedure and "proximal end" refers to an end that is near the operator during a surgical procedure. Axial, refers to a direction parallel to the line connecting the distal center and the proximal center of the medical instrument; radial refers to a direction perpendicular to the axial direction.

As shown in fig. 1 to 4, according to an embodiment of the present invention, a negative pressure source assembly is provided, which includes a housing 10, a roller assembly 20, a hose 30, and a limiting assembly 40, wherein a mounting chamber 11 is provided in the housing 10, the roller assembly 20 is rotatably disposed in the mounting chamber 11, and the hose 30 is disposed between the roller assembly 20 and an inner wall of the housing 10. The roller assembly 20 includes at least two rollers 23 for pressing the hose 30, and when the roller assembly 20 rotates, the rollers 23 rotate relative to the inner wall of the housing 10 and press the hose 30 having elasticity, and the hose 30 is alternately pressed by the rollers 23 so that fluid in the hose 30 can continuously flow, thereby realizing the pumping function of the negative pressure source assembly. It should be noted that, as will be understood by those skilled in the art, when the sucked liquid is a liquid which is not easy to block the hose 30, and has good fluidity, such as water, the hose 30 is pressed by a roller 23, and after the roller 23 leaves the hose 30, the hose 30 rebounds to generate negative pressure, so that the liquid can be sucked relatively smoothly. However, when the sucked liquid is thick blood and contains thrombus inside, the blood easily blocks the hose 30, if only one roller 23 presses the hose 30, once the inlet of the hose 30 is blocked, when the roller 23 rotates to a position where the hose is not pressed, the hose rebounds to generate negative pressure, but the inlet is blocked by the thrombus, and at this time, the blood at the outlet is easily sucked into the body, thereby forming a suck-back phenomenon, and medical accidents are easily generated clinically. Thus, when sucking blood with thrombus, the rollers 23 are provided at least in two, wherein the hose is always pressed by at least one of the two rollers, so that the blood at the suction outlet can be blocked from the body.

At least one of a limiting structure 51, a limiting structure 52 or a limiting structure 53 is further arranged on the shell 10 or the roller assembly 20, and the limiting assembly 40 is matched with the limiting structure, so that the limiting assembly 40 can move on the limiting structure, and the limiting assembly 40 can move from an initial position to a final position. Wherein, the relative position of the roller 23 and the hose 30 is changed in the process of moving the limit component 40 from the initial position to the final position, thereby avoiding the roller 23 from extruding the hose 30 for a long time in the process of long-term storage of the negative pressure source component; or the deformed hose 30 is moved out of the fixed position contacted with the roller 23 relative to the roller 23, so that the influence of the deformed part of the hose 30 on the negative pressure source assembly is reduced, and the functional failure of the negative pressure source assembly for conveying liquid due to the deformation of the hose 30 is avoided even if the negative pressure source assembly is placed for a long time.

The technical scheme of the invention will be further described in detail below with reference to specific examples.

Example 1

In this embodiment, as shown in fig. 2 to 5, the roller assembly 20 further includes a support seat 21 and a roller 22, the support seat 21 has a rotation axis 214, the roller 22 is disposed on the support seat 21, the roller 23 is rotatably sleeved on the roller 22, and when the support seat 21 rotates around the rotation axis 214, the roller 22 is driven to rotate in the installation cavity 11 relative to the inner wall of the housing 10, so that the roller 23 sleeved on the roller 22 alternately presses the hose 30 to drive the liquid in the hose 30 to flow.

As shown in fig. 1, 6 and 7 and 8, the limiting structure includes a first limiting structure 51, the limiting assembly 40 includes a first limiting member 41, the first limiting member 41 includes a pressing portion 411, a pushing portion 412 and a connecting portion 413 connected in sequence, and the roller 22 includes a main body portion 221 and a mating portion 222 connected to each other. The pressing portion 411 is located outside the housing 10, the pushing portion 412 and the connecting portion 413 extend into the housing 10, the first limiting structure 51 is disposed on the supporting seat 21, the connecting portion 413 is movably matched with the first limiting structure 51, and the first limiting member 41 can be moved from the initial position to the final position by pressing the pressing portion 411. The main body 221 is movably connected to the support 21, and allows the roller 22 to move relative to the support 21. The engaging portion 222 extends from the support seat 21 toward the pushing portion 412 and is in abutting engagement with the pushing portion 412.

When the first limiting member 41 moves from the initial position to the end position, the pushing portion 412 moves to a side close to the roller 22, such that the pushing portion 412 first abuts against the engaging portion 222, and as the pushing portion 412 continues to move, the pushing portion 412 pushes the engaging portion 222 to move the roller 22 relative to the supporting seat 21, such that the roller 23 is driven by the roller 22 to move along the radial direction of the supporting seat 21, thereby changing the relative position between the roller 23 and the hose 30. In detail, when the first stopper 41 is at the initial position, the roller 23 is not in contact with the hose 30, and when the first stopper 41 is at the end position, the roller 22 is moved by the pushing portion 412 to expand radially outwardly of the support base 21, so that the distance between the roller 23 and the rotation axis 214 is increased compared with the previous distance, and the roller 23 is brought close to the hose 30 and presses the hose 30. Therefore, the negative pressure source assembly brings the first stopper 41 into the initial position during long-term storage, and the roller 23 is out of contact with the hose 30, so that the squeezing deformation of the hose 30 is not caused even if the negative pressure source assembly is left for a long time. When the negative pressure source assembly is needed, the first limiting piece 41 is located at the end position, the roller 23 is enabled to press the hose 30, and accordingly negative pressure is generated when the roller 23 is enabled to alternately press the hose 30 in the rotation process of the supporting seat 21, and fluid (gas or liquid) in the hose 30 can be normally conveyed.

In an exemplary embodiment, as shown in fig. 8, the first limiting structure 51 is disposed on the supporting seat 21, the first limiting structure 51 includes a cavity 511 formed on the supporting seat 21, and a first clamping groove 512 and a second clamping groove 513 disposed in the cavity 511, the cavity 511 forms an opening for inserting the connecting portion 413 of the first limiting member 41 at a side facing the first limiting member 41, and the overall contour of the cavity 511 is matched with the connecting portion 413, so that the connecting portion 413 can slide smoothly in the cavity 511. The connecting portion 413 has a hook 4131 that cooperates with the first slot 512 or the second slot 513, and the hook 4131 can be engaged into the first slot 512 or the second slot 513 to limit the movement of the first limiting member 41 by cooperation of the hook 4131 and the first slot 512 or the second slot 513. In detail, the first clamping groove 512 is closer to the first limiting member 41 than the second clamping groove 513 (i.e., the first clamping groove 512 is disposed closer to the opening of the cavity 511 than the second clamping groove 513), and the engaging portion 222 of the roller 22 extends from the supporting seat 21 toward the pushing portion 412. When the hook 4131 is located in the first slot 512, the first limiting member 41 is at the initial position, and the engaging portion 222 is located between the pushing portion 412 and the supporting seat 21. When the first limiting member 41 moves from the initial position to the end position, the pushing portion 412 moves in a direction approaching the support base 21, and in the process, the pushing portion 412 abuts against the engaging portion 222 and pushes the engaging portion 222 to move relative to the support base 21. As shown in fig. 11, when the hook 4131 moves to the second clamping groove 513, the first limiting member 41 is at the end position, and the first limiting member 41 is limited to move relative to the supporting seat 21 by the cooperation of the hook 4131 and the second clamping groove 513.

In an exemplary embodiment, as shown in fig. 8 and 11, the cross-section of the hook 4131, the first clamping groove 512 or the second clamping groove 513 along the rotation axis 214 of the rotation shaft 213 is in an inverted triangle structure, so that the first limiting member 41 can only move unidirectionally, when the hook 4131 is located in the first clamping groove 512, the pushing portion 412 can move in a direction approaching to the mating portion 222, and when the hook 4131 is clamped into the second clamping groove 513, the second clamping groove 513 limits the reverse movement of the first limiting member 41. And, when the hook 4131 is locked in the second locking groove 513, the pushing portion 412 abuts against the supporting seat 21 at a side close to the supporting seat 21, so as to completely limit the movement of the first limiting member 41 along the direction of the rotation axis 214.

In an exemplary embodiment, as shown in fig. 5, the support base 21 includes a first support plate 211, a second support plate 212, and a rotation shaft 213, and both ends of the rotation shaft 213 are connected to the first support plate 211 and the second support plate 212, respectively. In detail, as shown in fig. 5 and 8, the first support plate 211 and the second support plate 212 are both in an equilateral triangle plate structure, and the rotation shaft 213 has a hollow structure 2131, it is understood that the first limiting structure 51 in the present embodiment is disposed in the hollow structure 2131. The rotation shaft 213 is specifically in a hollow cylindrical structure, the rotation shaft 213 is vertically connected with the first support plate 211 and the second support plate 212, and a rotation axis 214 of the rotation shaft 213 passes through the centers of the first support plate 211 and the second support plate 212. Waist-shaped holes 2111 are formed near the corners of the first support plate 211 and the second support plate 212, and the negative pressure source assembly is provided with three rollers 22, and each roller 22 is sleeved with one roller 23. Referring to fig. 5 and 7, both ends of the body portion 221 of each roller 22 are slidably disposed in the waist-shaped holes 2111 of the first support plate 211 and the second support plate 212, respectively, and the fitting portion 222 of the roller 22 protrudes toward the pushing portion 412 through the waist-shaped holes 2111 of the first support plate 211. The connecting portion 413 of the first limiting member 41 is inserted into the hollow structure 2131 of the rotating shaft 213, the matching portion 222 of the roller 22 is located between the first supporting plate 211 and the pushing portion 412 of the first limiting member 41, the pressing portion 411 is located on one side of the pushing portion 412 away from the connecting portion 413, the pressing portion 411 includes a rod portion connected with the pushing portion 412 and a cap portion connected with the rod portion, and a through hole through which the rod portion passes is formed in the housing 10, so that the cap portion is located outside the mounting cavity 11.

Referring to fig. 6 to 8, when the first limiting member 41 is at the initial position, a gap is formed between the cap portion and the housing 10, and the roller 23 can slide along the waist-shaped hole 2111 toward the center of the supporting seat 21 (i.e. the rotation axis 214) when receiving the resilience force of the hose 30, and the roller 23 does not press the negative pressure pipe in this state. When the cap-shaped part in the pressing part 411 is needed to be started, the pushing part 412 moves towards the direction approaching to the first supporting plate 211, wherein one side of the pushing part 412 facing to the roller 22 is provided with a conical surface 4121, the conical surface 4121 is propped against the matching part 222, along with the continuous movement of the pushing part 412, the matching part 222 of the roller 22 expands outwards under the guidance of the conical surface 4121, the roller 22 slides in the waist-shaped hole 2111 towards the direction far away from the center of the supporting seat 21, the roller 22 drives the roller 23 to be far away from the center (namely the rotation axis 214) of the supporting seat 21, and the roller 23 gradually continuously approaches the hose 30 and presses the hose 30. Referring to fig. 9 to 11, when the first stopper 41 is moved to the end position, the hose 30 is in a state of being pressed by the roller 23, and the roller 23 rotates with the support 21 to alternately press the hose 30, thereby achieving the pumping function of the negative pressure source assembly.

Wherein, to increase the relative movement distance between the roller 23 and the hose 30, the long axis of the waist-shaped hole 2111 is set to intersect the rotation axis 214.

As shown in fig. 9, the engagement portion 222 is provided with an inclined surface 2221 that is brought into abutting engagement with the tapered surface 4121 toward one end of the pushing portion 412, so that the engagement of the pushing portion 412 with the engagement portion 222 is smoother.

It should be emphasized that, since the connecting portion 413 of the first limiting member 41 is inserted into the hollow structure 2131 of the rotating shaft 213, so that the pushing portion 412 is coaxially disposed with the rotating shaft 213, when the first limiting member 41 moves to the final position, contact points between the mating portions 222 of the three rollers 22 and the tapered surface 4121 of the pushing portion 412 can be co-rounded, so that distances between the rollers 22 and the rotating axis 214 are equal, and thus it is ensured that the extrusion degree of the rollers 23 to the hose 30 is closer during rotation of the supporting seat 21, and the negative pressure generated by the negative pressure source assembly is more stable.

To further enhance the more stable sliding of the roller 22 within the kidney-shaped aperture 2111, at least one end of the body portion 221 has a flat surface that slidably mates with the kidney-shaped aperture 2111.

In another exemplary embodiment, as shown in fig. 12 and 13, circular holes 2112 are provided in the areas of the first support plate 211 and the second support plate 212 near the corners, and three rollers 22 are rotatably provided on the circular holes 2112 of the first support plate 211 and the second support plate 212, respectively. In detail, the main body 221 of the roller 22 includes a straightening section 2211, a first bending section 2212 and a second bending section 2213 disposed at two ends of the straightening section 2211, the first bending section 2212 is rotatably disposed in a circular hole 2112 of the first support plate 211, the second bending section 2213 is rotatably disposed in a circular hole 2112 of the second support plate 212, and the mating portion 222 is connected to the first bending section 2212. Wherein the straight segment 2211 is on the same axis with the mating portion 222, and the rotation axis of the curved segment in the circular hole 2112 is not in the same plane with the straight segment 2211. In other embodiments, the straight segment 2211 may not be on the same axis as the mating portion 222.

When the first limiting member 41 is at the initial position, the roller 23 is subjected to the resilience force of the hose 30 to rotate the roller 22 in the circular hole 2112, the first curved section 2212 and the second curved section 2213 located in the circular hole 2112 are taken as rotation axes, and the rotation matching portion 222 drives the straightening section 2211 to rotate around the rotation axes, so that the roller 23 rotates in a direction approaching to the center of the supporting seat 21, and the roller 23 is far away from the hose 30, and at this time, the roller 23 does not press the negative pressure pipeline. When the first stopper 41 is required to be started, the pressing portion 411 of the first stopper 41 is rotated and pressed, and in the process of moving the first stopper 41 from the initial position to the end position, on the one hand, when the pressing portion 411 is pressed, the pushing portion 412 is abutted against the mating portion 222, and in the process of rotating the first stopper 41, the mating portion 222 can be driven to rotate along with the pushing portion 412, so that the first curved section 2212 and the second curved section 2213 located in the circular hole 2112 are rotation axes, the rotation mating portion 222 drives the straightening section 2211 to rotate around the rotation axes, and when the first stopper 41 moves to the end position, the roller 22 drives the roller 23 to rotate to a position away from the center (namely, the rotation axis 214) of the supporting seat 21, so that the roller 23 plays a role of extruding the hose 30 (in which fig. 11 is a state that the first stopper 41 is located at the end position). In this embodiment, by means of the rotation fit between the roller 22 and the circular hole 2112, the sliding jamming can be avoided, and in order to further improve the smoothness of rotation, a bearing may be mounted on the circular hole 2112, so that the roller 22 is rotatably connected to the supporting seat 21 through the bearing.

Example two

The differences between the second embodiment and the first embodiment will be described below, and the second embodiment is the same as or similar to the first embodiment and will not be described here again.

In this embodiment, as shown in fig. 14 to 17, the limiting structure includes a second limiting structure 52, and the limiting assembly 40 includes a second limiting member 42. Specifically, the second limiting structure 52 is disposed on the housing 10, and the second limiting structure 52 is located outside the mounting cavity 11. The second limiting structure 52 includes a first sliding portion 521 and a first stopping portion 522, where the first sliding portion 521 is in an inverted U-shaped shell shape, a first slide 5211 is defined between the first sliding portion 521 and the housing 10, the first stopping portion 522 is disposed in the first slide 5211, the first stopping portion 522 is provided with a first through hole 5221 through which the first end 31 of the hose 30 passes out of the mounting cavity 11, and the first end 31 of the hose 30 can extend out of the first through hole 5221. The second limiting member 42 is slidably disposed in the first slideway 5211, and the second limiting member 42 is connected to the first end 31 of the hose 30, and the second limiting member 42 is in stop fit with the first stop 522. Referring to fig. 16, when the second limiting member 42 is at the initial position, the second limiting member 42 is spaced from the first stopping portion 522 by a first preset distance H, the supporting seat 21 rotates to enable the roller 23 to press the hose 30, and the hose 30 moves along the outer periphery of the supporting seat 21 relative to the housing 10 under the friction force between the roller 23 and the hose 30, i.e. the hose 30 slides from the first end 31 of the hose 30 to the second end 32 of the hose 30, so as to drive the second limiting member 42 to slide in the first slideway 5211 towards the side close to the stopping portion. Referring to fig. 17, when the hose 30 slides from the first end 31 to the second end 32 by a length of a first preset distance, the second limiting member 42 abuts against the stop portion, thereby preventing the hose 30 from sliding continuously. In this embodiment, the hose 30 is made to have a sliding degree of freedom with a first preset interval before the negative pressure source assembly works normally, on one hand, the problem of deformation or adhesion of the hose 30 caused by long-time extrusion of the roller 23 on the same part of the hose 30 can be avoided by sliding the hose 30 with the first preset interval during long-term storage of the negative pressure source assembly; on the other hand, before the operation, the hose 30 at the extrusion deformation part can be moved out of the contact area between the roller 23 and the hose 30 (namely, the position not extruded by the roller 23), so that the part of the hose 30 which is not extruded can be brought into the position which can be extruded by the roller 23, thereby realizing the negative pressure conveying function and solving the problem that the performance of the hose 30 is affected by the extrusion deformation.

In this embodiment, to ensure that the deformed portion is moved out of the contact area of the roller 23 and the hose 30. As shown in fig. 16 and 18, the housing 10 includes an inner wall section having a circular arc shape, a portion of the flexible tube 30 is disposed between the roller assembly 20 and the inner wall section in a curved shape, and the length of the moving track of the roller 23 is a first length L from contacting the flexible tube 30 to separating from the flexible tube 30 during the rotation of the roller 23 along with the supporting seat 21, and the length of the first preset distance H is greater than the first length L.

In one exemplary embodiment, as shown in fig. 14 and 17, the spacing structure further includes a third spacing structure 53, and the spacing assembly 40 further includes a third spacing member 43. The third limiting structure 53 is disposed on the housing 10, and the third limiting structure 53 is located outside the mounting cavity 11. The third limiting structure 53 includes a second sliding portion (not shown in the drawing) and a second stop portion (not shown in the drawing), the second sliding portion is in an inverted U-shaped shell shape, a second slide (not shown in the drawing) is defined between the second sliding portion and the housing 10, the second stop portion is disposed in the second slide and is provided with a second through hole (not shown in the drawing) through which the second end 32 of the hose 30 passes out of the mounting cavity 11, and the second end 32 of the hose 30 can extend out of the second through hole. The third limiting member 43 is slidably disposed in the second slideway, and the third limiting member 43 is connected to the second end 32 of the hose 30, and the third limiting member 43 is in stop fit with the second stop portion. When the third limiting piece 43 is at the initial position, the third limiting piece 43 abuts against the second stop portion. When the second limiting member 42 moves to the final position, the third limiting member 43 is spaced from the second stopping portion by a first preset distance H.

The second stopper 42 and the third stopper 43 are each provided with a fluid passage for communicating the hose 30 with an external pipe, so that the negative pressure source assembly is connected to the pipe for transporting fluid from the outside. It should be noted that in this embodiment, the roller assembly may be the same as or different from the first embodiment, for example, the roller assembly may be a single-layer support seat, a roller is fixed on an edge of the support seat, and the support seat rotates around a center of the support seat to drive the roller to rotate, so that the roller brought onto the roller presses the hose.

Example III

The differences between the third embodiment and the first and second embodiments will be described below, and the same or similar points as those between the third embodiment and the first and second embodiments will not be described here again.

In this embodiment, as shown in fig. 19 and 20, the negative pressure source assembly further includes a reduction gear assembly 60, where the reduction gear assembly 60 is composed of a plurality of gears 63 meshed with each other, and the reduction gear assembly 60 includes a power output end 61 and a power input end 62, where the power input end 62 of the reduction gear assembly 60 is in driving connection with the external driving device 202, and the power output end 61 is in driving connection with the support base 21. The reduction gear assembly 60 is used to transmit the rotational power of the external driving device 202 to the support base 21 and reduce the rotational speed of the support base 21 relative to the power output end 61 of the external driving device 202.

Further, as shown in fig. 21 and 22, in order to avoid the reverse rotation of the roller assembly 20 of the negative pressure source assembly caused by the error of the rotation direction of the motor due to the manual operation error, the suction inlet is changed into the suction outlet, which is harmful to the health of the patient, in this embodiment, the power output end 61 and the support seat 21 are in transmission connection through the ratchet mechanism 70, specifically, the ratchet mechanism 70 includes a ratchet 71 and a pawl 72, the ratchet 71 is disposed on one of the power output end 61 and the support seat 21, and the pawl 72 is disposed on the other of the power output end 61 and the support seat 21.

In an exemplary embodiment, as shown in fig. 20, 21 and 22, the ratchet 71 is connected to the power output end 61 of the reduction gear assembly 60, and the pawl 72 is disposed within the hollow structure 2131 of the shaft 213 near one end of the reduction gear assembly 60, with the ratchet 71 extending into the hollow structure 2131 to engage the pawl 72. The driving device 202 is a motor, and only when the motor rotates clockwise, the motor can push the supporting seat 21 to rotate, so that the roller 23 presses the hose 30, when the motor rotates anticlockwise, the ratchet wheel 71 cannot be meshed with the pawl 72 due to elastic deformation of the pawl 72 on the supporting seat 21, and the rotation power of the motor cannot be transmitted to the supporting seat 21.

According to an embodiment of the present invention, there is provided a negative pressure pump, as shown in fig. 23, a negative pressure pump 200 including: pump housing 201, negative pressure source assembly 100, and drive 202. Specifically, the negative pressure source assembly 100 and the driving device 202 are disposed in the pump case 201, and the power output end 61 of the driving device 202 is in driving connection with the support seat 21 in the negative pressure source assembly 100, and the pressing portion 411 of the first stopper 41 in the negative pressure source assembly 100 protrudes out of the pump case 201. In the negative pressure pump provided by the embodiment, in the storage process, the first limiting piece 41 is in the initial position, so that the roller 23 can be prevented from extruding the hose 30, and the negative pressure pump is ensured not to cause functional failure of the negative pressure source component for conveying liquid due to deformation of the hose 30 caused by extrusion of the hose 30 by the roller 23 even after long-term placement, thereby being beneficial to long-term storage placement of the negative pressure pump. When the negative pressure pump is used, the roller 23 can be in a state of pressing the hose 30 only by pressing the pressing part 411 to enable the first limiting piece 41 to be in the end position, so that the pumping function of the negative pressure pump is realized, and the operation is simple and quick. Or after the negative pressure pump is started, the hose 30 in the negative pressure pump slides for a first preset interval, so that the hose 30 at the extrusion deformation part is moved out of the contact area between the roller 23 and the hose 30 (namely, the position not extruded by the roller 23), and the part of the hose 30 which is not extruded enters the position capable of being extruded by the roller 23, thereby realizing the negative pressure conveying function, and further solving the problem that the performance of the hose 30 is affected by extrusion deformation. In this embodiment, the negative pressure pump is sterilized by ethylene oxide, and the negative pressure pump is a disposable product.

In some embodiments of the present invention, as shown in fig. 23, the negative pressure pump further includes: a power source 203 and a power switch 204, the power source 203 is arranged in the pump shell 201, and the power source 203 is electrically connected with the driving device 202 and is used for supplying power to the driving device 202. The power switch 204 is arranged on the outer side surface of the pump shell 201, the power switch 204 is used for controlling the on-off of a circuit connecting the power supply 203 and the driving device 202, and the power switch 204 is used for controlling the starting or the closing of the negative pressure pump. In other embodiments, the drive 202 may be activated by a non-power device, such as by mechanically manually activating the drive 202.

According to an embodiment of the present invention, a negative pressure suction pump assembly is proposed, as shown in fig. 24, a negative pressure suction pump assembly 300 comprising: negative pressure pump 200, first conduit 301, and second conduit 302. The pump housing 201 of the negative pressure pump 200 is provided with an inlet for the pipeline to penetrate and an outlet for the pipeline to penetrate, the proximal end of the first pipeline 301 passes through the inlet to be communicated with the first end 31 of the hose 30 of the negative pressure source assembly in the negative pressure pump 200, and the distal end of the second pipeline 302 passes through the outlet to be communicated with the second end 32 of the hose 30 of the negative pressure source assembly in the negative pressure pump 200. In the implementation process, the distal end of the first pipeline 301 is connected with a suction catheter (not shown), the suction catheter can extend into a vascular lesion site, the proximal end of the first pipeline 301, the negative pressure pump 200 and other components are located outside the body, and the negative pressure pump 200 is started to pump lesion plaques out of the blood vessel through the first pipeline 301 and the second pipeline 302. The negative pressure suction pump assembly provided by the invention can not cause the functional failure of the negative pressure source assembly for conveying liquid due to the deformation of the hose 30 caused by the fact that the hose 30 is extruded by the roller 23, and is beneficial to long-term storage and placement of the negative pressure pump.

In some embodiments of the present invention, as shown in fig. 24, the negative pressure suction pump assembly further includes: at least one of a fluid collection bag 303, a flow switch 304, a syringe 305, and a filter 307.

A collection bag 303 is in communication with the proximal end of the second conduit 302, the collection bag 303 being adapted to collect waste liquid pumped by the negative pressure pump. The flow switch 304 is provided on the first pipe 301, and the on-off of the first pipe 301 is controlled by the flow switch 304. The syringe 305 is communicated with the first pipeline 301 through the T-shaped connector 306, the syringe 305 is located at one side of the proximal end of the flow switch 304, the syringe 305 can also be used as a negative pressure source of the negative pressure suction pump assembly, the syringe 305 can be manually operated to perform suction action on the premise that the negative pressure pump is not started, fluid in the first pipeline 301 flows into the syringe 305, and the negative pressure suction pump assembly can manually operate the syringe 305 to perform suction action or can start the negative pressure pump to perform automatic suction action so as to select an appropriate operation mode based on actual needs. Alternatively, the syringe can be used in a state where the negative pressure pump is turned on. The filter 307 is arranged on the first pipeline 301, the filter 307 is arranged on one side of the proximal end of the injector 305, and the filter 307 is used for filtering, so that the problem that the larger plaque of the first pipeline 301 enters into the negative pressure pump to cause blockage failure of the negative pressure pump can be avoided, the negative pressure pump can be closed at the moment, and the injector 305 is manually operated to suck the plaque into the injector 305, so that the blockage problem caused by the larger plaque is solved.

In summary, in the negative pressure source assembly according to the embodiment of the present invention, by changing the relative positions of the roller and the hose of the negative pressure source assembly in the working state and the storage state, on one hand, the roller of the negative pressure source assembly in the storage state does not squeeze the hose, and does not cause squeezing deformation of the hose, and in the working state, the first limiting member pushes the roller to move to a position capable of squeezing the hose, so that the negative pressure source assembly can generate a stable negative pressure environment; on the other hand, when the negative pressure source component is started, the hose slides relative to the shell under the drive of the roller, and even if the hose is deformed in a hose part area due to long-term extrusion of the roller, the hose at the extrusion deformation part can be moved out of the contact area (namely, the position which is not extruded by the roller) of the roller and the hose, so that the unpressed hose part enters the position which can be extruded by the roller, and the negative pressure conveying function is realized, thereby solving the problem that the performance of the hose is influenced due to extrusion deformation.

Claims (19)

1. A negative pressure source component comprises a shell with a mounting cavity, a roller component rotatably arranged in the mounting cavity and a hose penetrating between the roller component and the inner wall of the shell, and is characterized in that,

The roller assembly comprises at least two rollers for extruding the hose;

the negative pressure source assembly further comprises:

the limiting assembly and the limiting structure are matched, the limiting structure is arranged on the shell and/or the roller assembly, the limiting assembly can move relative to the limiting structure, and the relative position of the roller and the hose is changed in the process of moving from the initial position to the end position.

2. The negative pressure source assembly of claim 1, wherein the roller assembly further comprises:

a support base having an axis of rotation;

the roller is arranged on the supporting seat and is rotatably sleeved with the roller;

the supporting seat drives the rolling shaft to rotate around the rotating axis of the supporting seat and enables the roller to squeeze the hose.

3. The negative pressure source assembly of claim 2, wherein the negative pressure source assembly comprises,

the limiting structure comprises a first limiting structure arranged on the supporting seat;

the limiting assembly comprises a first limiting part, wherein the first limiting part comprises a pushing part and a connecting part which are connected, and the connecting part is matched with the first limiting structure so that the connecting part can move relative to the first limiting structure;

The roller comprises a main body part for bearing the roller and a matching part facing the first limiting piece, the main body part is movably connected with the supporting seat, and the matching part is in abutting fit with the pushing part;

in the process that the first limiting piece moves from the initial position to the end position, the pushing part pushes the matching part to enable the roller to drive the roller to move along the radial direction of the supporting seat.

4. The negative pressure source assembly of claim 3, wherein,

the first limiting structure comprises a cavity formed on the supporting seat, and a first clamping groove and a second clamping groove formed on the inner wall of the cavity, wherein the first clamping groove is close to the first limiting piece relative to the second clamping groove;

the connecting part can movably extend into the cavity, and is provided with a clamping hook which can be clamped into the first clamping groove or the second clamping groove;

when the clamping hook is positioned in the first clamping groove, the first limiting part is positioned at the initial position, and when the clamping hook is positioned in the second clamping groove, the first limiting part is positioned at the end position.

5. The negative pressure source assembly of claim 3, wherein,

The supporting seat comprises a first supporting plate and a second supporting plate which are arranged in parallel, and a rotating shaft which is connected with the first supporting plate and the second supporting plate, and two ends of the main body part are respectively and movably connected with the first supporting plate and the second supporting plate;

the rotating shaft is provided with a hollow structure, and the first limiting structure is formed in the hollow structure.

6. The negative pressure source assembly of claim 5, wherein the negative pressure source assembly comprises,

the first support plate and the second support plate are respectively provided with a waist-shaped hole, and two ends of the main body part are respectively and slidably arranged in the waist-shaped holes of the first support plate and the second support plate;

wherein, the cooperation portion passes the waist hole of first backup pad towards the promotion portion stretches out.

7. The negative pressure source assembly of claim 5, wherein the negative pressure source assembly comprises,

the side surface of the pushing part facing the rolling shaft is provided with a conical surface;

one end of the matching part, which faces the pushing part, is provided with an inclined surface which is in butt joint with the conical surface.

8. The negative pressure source assembly of claim 6, wherein the negative pressure source assembly comprises,

at least one end of the main body part is provided with a plane which is in sliding fit with the waist-shaped hole.

9. The negative pressure source assembly of claim 5, wherein the negative pressure source assembly comprises,

round holes are formed in the first supporting plate and the second supporting plate;

the main body part comprises a straightening section, a first bending section and a second bending section, wherein the first bending section and the second bending section are arranged at two ends of the straightening section, the first bending section is rotatably arranged in a round hole in the first supporting plate, the second bending section is rotatably arranged in a round hole in the second supporting plate, and the matching part is connected with the first bending section;

wherein the rotation axis of the bending section in the round hole is in a different plane from the straightening section.

10. The negative pressure source assembly of claim 3, wherein,

the first limiting piece further comprises a pressing part connected with the pushing part, and the pressing part is located outside the shell.

11. The negative pressure source assembly of claim 1, wherein the negative pressure source assembly comprises,

the limiting structure comprises a second limiting structure arranged on the shell, the second limiting structure comprises a first sliding part and a first stopping part, the first sliding part and the shell define a first slideway, the first stopping part is arranged in the first slideway, and the first stopping part is provided with a first through hole for the first end of the hose to pass through the mounting cavity;

The limiting assembly comprises a second limiting piece which is slidably arranged in the first slideway and connected with the first end of the hose, and the second limiting piece is in stop fit with the first stop part;

when the second limiting part is positioned at the initial position, the second limiting part and the first stopping part are separated by a first preset distance, and the roller assembly rotates to enable the roller to drive the hose to move along the periphery of the roller assembly relative to the shell.

12. The negative pressure source assembly of claim 11, wherein the negative pressure source assembly comprises,

the limiting structure further comprises a third limiting structure arranged on the shell, the third limiting structure comprises a second sliding part and a second stopping part, the second sliding part and the shell define a second slideway, the second stopping part is arranged in the second slideway, and the second stopping part is provided with a second through hole for the second end of the hose to pass through the mounting cavity;

the limiting assembly comprises a third limiting piece which is slidably arranged in the second slideway and connected with the second end of the hose, and the third limiting piece is in stop fit with the second stop part;

When the third limiting piece is positioned at the initial position, the third limiting piece abuts against the second stop part.

13. The negative pressure source assembly of claim 12, wherein the negative pressure source assembly comprises,

the shell comprises an inner wall section in a circular arc shape, and part of the hose is arranged between the roller assembly and the inner wall section in a bending manner;

the roller rotates along with the roller assembly, and the length of the moving track of the roller is a first length from the contact of the roller with the hose to the separation of the roller from the hose;

the length of the first preset interval is larger than the first length.

14. The negative pressure source assembly of claim 1, further comprising:

the speed reduction gear assembly comprises a power output end and a power input end, the power input end of the speed reduction gear assembly is in transmission connection with an external driving device, and the power output end is in transmission connection with the roller assembly.

15. The negative pressure source assembly of claim 14, wherein the negative pressure source assembly comprises,

the power output end is in transmission connection with the roller assembly through a ratchet mechanism, the ratchet mechanism comprises a ratchet wheel and a pawl, the ratchet wheel is arranged at one of the power output end and the roller assembly, and the pawl is arranged at the other of the power output end and the roller assembly.

16. A negative pressure pump, characterized in that the negative pressure pump comprises:

a pump housing;

the negative pressure source assembly of any one of claims 1-15, provided within the pump housing;

the driving device is arranged in the pump shell, and the power output end of the driving device is in transmission connection with the roller component in the negative pressure source component;

wherein, first locating part in the negative pressure source subassembly stretches out the pump case.

17. The negative pressure pump of claim 16, further comprising:

the power supply is arranged in the pump shell and is electrically connected with the driving device;

the power switch is arranged on the outer side surface of the pump shell and is used for controlling the on-off of a circuit connecting the power supply and the driving device.

18. A negative pressure suction pump assembly, the negative pressure suction pump assembly comprising:

the negative pressure pump according to claim 16, wherein an inlet through which the pipe penetrates and an outlet through which the pipe penetrates are provided in a pump housing of the negative pressure pump;

a first conduit having a proximal end in communication with a first end of a hose of a negative pressure source assembly in the negative pressure pump through the inlet;

A second conduit having a distal end communicating through the outlet with a second end of a hose of a negative pressure source assembly in the negative pressure pump.

19. The negative pressure suction pump assembly of claim 18, further comprising:

a liquid collection bag in communication with the proximal end of the second conduit;

and/or a flow switch arranged on the first pipeline;

and/or a syringe in communication with the first conduit via a T-connector, the syringe being located on a side of the proximal end of the flow switch;

and/or a filter is arranged on the first pipeline, and the filter is positioned on one side of the proximal end of the injector.