CN219208317U

CN219208317U - Negative pressure aspirator and negative pressure connection external member

Info

Publication number: CN219208317U
Application number: CN202222808359.4U
Authority: CN
Inventors: 史珮珍; 牛正川; 陆洲
Original assignee: Zhongshan Hospital Fudan University
Current assignee: Zhongshan Hospital Fudan University
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-06-20
Anticipated expiration: 2032-10-24

Abstract

The utility model provides a negative pressure aspirator and a negative pressure connection kit, wherein the negative pressure aspirator comprises piston engagement teeth, and the piston engagement teeth are connected to the periphery of a piston rod; the cylinder body meshing teeth comprise hard connecting pieces and elastic connecting pieces, and the hard connecting pieces are connected with the inner wall of the cylinder body. This negative pressure aspirator and negative pressure connection external member is through establishing barrel interlock tooth as the stereoplasm connection piece and the elastic connection piece of components of a whole that can function independently to leave the interval between stereoplasm connection piece and elastic connection piece, through stereoplasm connection piece and elastic connection piece cooperation, restrict the relative position between piston rod and the barrel, and then realize that the piston rod can form a negative pressure cavity in the barrel through the pull piston body, the accessible leads to liquid port connection outside negative pressure suction line, accomplish the negative pressure suction, wherein the stereoplasm connection piece and the elastic connection piece that components of a whole that can function independently and interval set up realize the reduction of material use amount, and then reduced manufacturing cost.

Description

Negative pressure aspirator and negative pressure connection external member

Technical Field

The utility model relates to the technical field of medical supplies, in particular to a negative pressure aspirator and a negative pressure connection sleeve.

Background

At present, a wall type negative pressure suction device is often used for drainage of postoperative pus in clinic, but along with rehabilitation of a patient, drainage liquid is gradually reduced, the wall type negative pressure suction device is not beneficial to patient activities of getting down, a small amount of negative pressure suction device which can facilitate the drainage of pus carried by the patient during activities of getting down is needed, a portable negative pressure drainage device which is clinically used is generally used for gastrointestinal decompression, the condition of incomplete drainage can occur during operation of a small incision, and the volume of a negative pressure suction box in the negative pressure drainage device is overlarge and easy to slide, so that a catheter is slipped off, and the negative pressure suction device which is small in volume, light in weight and capable of effectively operating drainage for the small incision is needed.

To solve the above problems, an utility model patent with publication number CN216725426U discloses a negative pressure injector, comprising a syringe having a needle end and a finger tip; the push rod comprises a rod body, the rod body is movably arranged in the needle cylinder, a pressing sheet is arranged at one end of the rod body, and a sealing plug head is arranged at the other end of the rod body; the first locking component is detachably arranged on the rod body and is provided with a plurality of locking teeth and a plurality of fixing buckles, and the fixing buckles are used for locking the first locking component on the push rod; the second locking component is arranged on the finger wing of the finger wing end of the needle cylinder and used for fixing the first locking component; the first locking part is detachably arranged on the push rod, so that the common injector is changed into the negative pressure injector, and the cost is saved; by arranging a plurality of locking teeth, negative pressure environments with different pressures in the needle cylinder are realized. It can be seen that the prior art solves the above problems by adding the first locking component and the second locking component on the basis of a common injector, and the clamping effect on the push rod is achieved by combining a plurality of movable components such as the first locking component and the second locking component, and the locking teeth are designed into an integral solid structure for ensuring the stability after clamping, so that the material consumption is increased, the production cost is increased, the quality of the produced finished product is increased, the carrying is not facilitated, and the popularization is not easy.

In view of the foregoing, there is an urgent need for a negative pressure aspirator and a negative pressure connection kit that have low material usage and can reduce costs.

Disclosure of Invention

In order to solve the problems that the prior negative pressure suction device has high structural material usage and is difficult to reduce cost, the utility model provides a negative pressure suction device and a negative pressure connection sleeve.

According to an object of the present utility model, there is provided a negative pressure suction apparatus comprising: the sleeve comprises a liquid passing port, a mounting port and a cylinder body which is connected between the liquid passing port and the mounting port in an extending mode;

the piston body is movably and hermetically attached between the periphery of the piston body and the inner wall of the cylinder body;

the piston rod is connected with the piston body;

further comprises:

piston engagement teeth connected to the outer periphery of the piston rod;

barrel interlock tooth, barrel interlock tooth includes stereoplasm connection piece and elastic connection piece, the stereoplasm connection piece is connected the barrel inner wall, the elastic connection piece is connected the barrel inner wall, the stereoplasm connection piece the elastic connection piece in the interval in proper order set up in lead to the liquid port with between the installation port, the piston rod passes through the piston interlock tooth is stirred the elastic connection piece, and but the pull connect in the barrel, wherein the stereoplasm connection piece can restrict piston interlock tooth moves towards lead to liquid port one side.

Preferably, the length of the elastic connecting piece in the radial direction of the cylinder is larger than the length of the hard connecting piece in the radial direction of the cylinder.

Preferably, the hard connecting sheet, the elastic connecting sheet and the inner wall of the cylinder between the hard connecting sheet and the elastic connecting sheet enclose a hollowed-out triangular structure.

Preferably, the number of the piston engaging teeth is multiple, the multiple piston engaging teeth are arranged at intervals along the axial direction of the piston rod, the barrel engaging teeth are divided into multiple groups, the multiple groups of barrel engaging teeth are arranged at intervals along the axial direction of the barrel, the number of the barrel engaging teeth in each group is multiple, and the multiple barrel engaging teeth in each group are distributed around the barrel axial line ring at intervals.

Preferably, the piston rod comprises a first plate and a second plate, the length directions of the first plate and the second plate are the same, the first plate and the second plate are vertically crossed, and the width directions of the first plate and the second plate are respectively provided with the piston engagement teeth.

Preferably, the negative pressure connection kit further comprises a handle, wherein the handle and the piston body are respectively arranged at two ends of the piston rod, and the handle is exposed out of the cylinder body.

Preferably, the piston body is a piston body of a double-layer rubber cushion.

Preferably, the negative pressure connection kit further comprises a data scale, wherein the data scale is positioned on the outer wall of the cylinder, and the cylinder is a transparent cylinder.

The utility model also provides a negative pressure connection kit, which comprises the negative pressure suction apparatus and a three-way communication connector, wherein the three-way communication connector is provided with a first connecting end, a second connecting end and a third connecting end, a drainage passage is formed among the first connecting end, the second connecting end and the third connecting end, an adjusting valve for controlling the on-off of the drainage passage is further arranged on the three-way communication connector, the first connecting end is connected with the negative pressure suction apparatus, the second connecting end is a hollow conical second connecting end, and the third connecting end is a tubule-shaped third connecting end for connecting a medical T tube.

Preferably, the first connection end is in threaded connection with the liquid through port.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the negative pressure aspirator and the negative pressure connection kit, the barrel occlusion teeth are arranged to be the split hard connecting piece and the split elastic connecting piece, the space is reserved between the hard connecting piece and the elastic connecting piece, the relative position between the piston rod and the barrel can be limited through the cooperation of the hard connecting piece and the elastic connecting piece, the piston rod can form a negative pressure cavity in the barrel through the pull piston body, the external negative pressure suction pipeline can be connected through the liquid through port, negative pressure suction is completed, the hard connecting piece and the elastic connecting piece which are arranged at intervals and are split realize reduction of the material consumption, and further the production cost is reduced;

2. this negative pressure aspirator and negative pressure connection external member is prescribe a limit to through the structure shape that encloses stereoplasm connection piece and elastic connection piece to and barrel inner wall between the two, wherein triangle-shaped has stability, and the stereoplasm connection piece can keep the fixed with the position between the barrel, and then stably supports the elastic connection piece, has higher structural strength when elastic connection piece and stereoplasm connection piece meet, realizes the stable support of barrel interlock tooth to piston interlock tooth.

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings.

Drawings

Fig. 1 is a schematic overall cross-sectional view of one embodiment of a negative pressure aspirator according to the present utility model.

Fig. 2 is a schematic cross-sectional view of a cylinder bite tooth according to one embodiment of a negative pressure aspirator according to the present utility model.

Fig. 3 is a schematic drawing showing the drawing of a piston rod of an embodiment of a negative pressure aspirator according to the present utility model.

Fig. 4 is a schematic view of a rigid connection piece restraining cylinder engaging teeth of an embodiment of a negative pressure aspirator according to the present utility model.

Fig. 5 is a schematic view showing a connection between the engaging teeth of the cylinder and the cylinder in one embodiment of the negative pressure suction apparatus according to the present utility model.

Fig. 6 is a schematic side cross-sectional view of a piston rod of an embodiment of a negative pressure aspirator according to the present utility model.

Fig. 7 is a schematic view of a three-way connection joint of an embodiment of a negative pressure aspirator and a negative pressure connection kit according to the present utility model.

Fig. 8 is a schematic illustration showing communication between a first connection end and a second connection end of an embodiment of a negative pressure suction apparatus and a negative pressure connection kit according to the present utility model.

Fig. 9 is a schematic diagram of a first connecting end and a third connecting end of an embodiment of a negative pressure suction apparatus and a negative pressure connection kit according to the present utility model.

Fig. 10 is a schematic diagram of the overall connection of one embodiment of a negative pressure aspirator and a negative pressure connection kit according to the present utility model.

In the figure: 100. a sleeve; 101. a liquid port; 102. a mounting port; 103. a cylinder; 200. a piston body; 300. a piston rod; 301. a first plate; 302. a second plate; 400. piston engagement teeth; 500. barrel engaging teeth; 501. a hard connecting sheet; 502. an elastic connecting piece; 600. a handle; 700. a data scale; 800. a three-way communication joint; 801. a first connection end; 802. a second connection end; 803. a third connection end; 900. adjusting a valve; 901. a knob; 1000. a first protective cap; 1100. a second protective cap; 1101. a cap body; 1102. an inner plug; 1200. a third protective cap; a rotation direction a; a rotation direction b; the drawing direction c.

Detailed Description

The following description is presented to enable one of ordinary skill in the art to practice the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.

Referring to fig. 1-4, the present utility model provides a technical solution: a negative pressure aspirator, comprising:

a sleeve 100, wherein the sleeve 100 comprises a liquid port 101, a mounting port 102 and a cylinder 103 extending between the liquid port 101 and the mounting port 102;

a piston body 200, wherein the periphery of the piston body 200 is movably and hermetically jointed with the inner wall of the cylinder 103;

a piston rod 300, the piston rod 300 being connected to the piston body 200;

further comprises:

a piston engagement tooth 400, the piston engagement tooth 400 being connected to the outer circumference of the piston rod 300;

barrel interlock tooth 500, barrel interlock tooth 500 includes stereoplasm connection piece 501 and elastic connection piece 502, stereoplasm connection piece 501 connects barrel 103 inner wall, elastic connection piece 502 connects barrel 103 inner wall, stereoplasm connection piece 501 elastic connection piece 502 in the interval in proper order set up in lead to liquid port 101 with install between the port 102, piston rod 300 passes through piston interlock tooth 400 stirs elastic connection piece 502 to the drawable connect in barrel 103 is interior, wherein stereoplasm connection piece 501 can restrict piston interlock tooth 400 moves towards lead to liquid port 101 one side.

This negative pressure aspirator through establishing barrel interlock tooth 500 as the stereoplasm connection piece 501 and the elastic connection piece 502 of components of a whole that can function independently to leave the interval between stereoplasm connection piece 501 and elastic connection piece 502, through stereoplasm connection piece 501 and elastic connection piece 502 cooperation, can restrict the relative position between piston rod 300 and the barrel 103, and then realize that piston rod 300 can form a negative pressure cavity in barrel 103 through pull piston body 200, the accessible leads to liquid port 101 and connects outside negative pressure suction line, accomplish the negative pressure suction, wherein the stereoplasm connection piece 501 and the elastic connection piece 502 that components of a whole that can function independently and the interval set up realize the reduction to the material use amount, and then reduced manufacturing cost, device overall quality reduces simultaneously, easily carries and uses widely.

It should be noted that, the piston engagement tooth 400 is a unidirectional movable buckle, meaning that the piston rod 300 can only be pulled out of the cylinder 103 towards the mounting port 102 and fixed, and can not be pushed towards the direction of the liquid passing port 101 through the piston engagement tooth 400, when the piston rod 300 is pulled, the piston rod 300 drives the piston engagement tooth 400 to contact the cylinder engagement tooth 500, the elastic connecting piece 502 of the cylinder engagement tooth 500 moves unidirectionally, when the piston engagement tooth 400 moves to the side of the elastic connecting piece 502 deviating from the fixed connecting piece, the elastic connecting piece 502 resets under the self elastic action, wherein the hard connecting piece 501 restrains the deformation of the elastic connecting piece 502 towards the liquid passing port 101, so that the elastic connecting piece 502 restrains the movement of the piston rod 300 towards the liquid passing port 101 through the piston engagement tooth 400, thereby realizing the engagement effect, fixing the relative position between the piston rod 300 and the cylinder 103, and forming a negative pressure cavity between the piston body 200 and the cylinder 103.

Wherein elastic connection piece 502 sets up to the elastic connection piece 502 that the thickness is little in order to realize lightening device overall quality, because of elastic connection piece 502 thickness is little and have elasticity, leads to elastic connection piece 502 intensity less, when piston interlock tooth 400 moves to elastic connection piece 502 towards liquid port 101 one side, and solitary elastic connection piece 502 can not stabilize and carry out spacingly to piston interlock tooth 400, cooperates stereoplasm connection piece 501 to support elastic connection piece 502, can solve this problem.

In order to ensure the strength between the hard connecting piece 501 and the elastic connecting piece 502 which are arranged in a split manner, the cylinder engaging teeth 500 are further ensured to be capable of stably limiting the piston engaging teeth 400.

As shown in fig. 2-3, further, the length of the elastic connection piece 502 in the radial direction of the cylinder 103 is greater than the length of the hard connection piece 501 in the radial direction of the cylinder 103.

By limiting the length of the elastic connection piece 502 in the radial direction of the cylinder 103 and the length of the hard connection piece 501 in the radial direction of the cylinder 103, a certain distance can be reserved between the hard connection piece 501 and the piston engagement tooth 400 in the process of contacting the piston engagement tooth 400 by the elastic connection piece 502, so that the movement of the piston engagement tooth 400 in the drawing direction c is prevented from being influenced by the hard connection piece 501, and the position of the piston engagement tooth 400 can be limited by the portion of the elastic connection piece 502 extending relative to the hard connection piece 501.

Further, the hard connecting piece 501, the elastic connecting piece 502, and the inner wall of the cylinder 103 therebetween enclose a hollow triangle structure.

The structural shape defined by the hard connecting piece 501, the elastic connecting piece 502 and the inner wall of the cylinder 103 therebetween is defined, wherein the triangle has stability, so that the elastic connecting piece 502 and the hard connecting piece 501 have higher strength when being connected, and the stable support of the cylinder engaging teeth 500 to the piston engaging teeth 400 is realized.

As shown in fig. 1-4, further, the number of the piston engaging teeth 400 is plural, the plural piston engaging teeth 400 are arranged at intervals along the axial direction of the piston rod 300, the barrel engaging teeth 500 are divided into plural groups, the plural groups of the barrel engaging teeth 500 are arranged at intervals along the axial direction of the barrel 103, wherein the number of the barrel engaging teeth 500 in each group is plural, and as shown in fig. 5, the plural barrel engaging teeth 500 of each group are arranged at intervals around the axial line of the barrel 103 in a ring shape.

By defining the number of the piston engagement teeth 400 and the number of the cylinder engagement teeth 500 and further defining the arrangement of the piston engagement teeth 400 on the cylinder 103 and defining the arrangement of the cylinder engagement teeth 500 on the piston rod 300, the piston engagement teeth 400 can fully cooperate with the cylinder engagement teeth 500, and the fixing of the relative positions between the piston rod 300 and the cylinder 103 is achieved.

In one embodiment of the present utility model, as shown in fig. 5, the barrel biting teeth 500 are barrel biting teeth 500 having a protruding triangular tooth shape.

As shown in fig. 6, further, the piston rod 300 includes a first plate 301 and a second plate 302, the first plate 301 and the second plate 302 have the same length direction, and the first plate 301 and the second plate 302 vertically intersect, and the piston engaging teeth 400 are provided in the width direction of the first plate 301 and the width direction of the second plate 302, respectively.

By dividing the piston rod 300 into a first plate 301 and a second plate 302 which are perpendicularly crossed, wherein the perpendicularly crossed ensures the stability of the integral structure after the first plate 301 and the second plate 302 are connected, the connection position of the piston engagement teeth 400 on the first plate 301 and the second plate 302 is further limited, so that the piston engagement teeth 400 can cooperate with the barrel engagement teeth 500 to effectively limit the integral position of the piston rod 300.

Further, the negative pressure aspirator further comprises a handle 600, wherein the handle 600 and the piston body 200 are respectively disposed at two ends of the piston rod 300, and the handle 600 is exposed outside the cylinder 103.

Through setting up handle 600, the operator can realize the pull to piston rod 300 through handle 600, and then realizes the formation to the inside negative pressure environment of barrel 103, the operation of being convenient for.

Further, the piston body 200 is a piston body 200 with a double-layer rubber cushion.

Through setting up piston body 200 into double-deck cushion for piston body 200 and barrel 103 inner wall contact compactness is high, and piston body 200 and barrel 103 inner wall do not leave the space, and the gas tightness is better, can be better form the negative pressure cavity in barrel 103.

Further, the negative pressure aspirator further comprises a data scale 700, wherein the data scale 700 is positioned on the outer wall of the cylinder 103, and the cylinder 103 is a transparent cylinder 103.

By adding the data scale 700 to the outer wall of the cylinder 103, the amount of liquid drawn into the cylinder 103 is easily observed and read by an operator through the data scale 700.

As shown in fig. 7 and 10, for enabling the negative pressure aspirator to be effectively adapted to and connected with an external connection pipeline in a sealing manner, a negative pressure connection kit is provided, and the negative pressure aspirator further comprises a three-way communication connector 800, wherein the three-way communication connector 800 is provided with a first connection end 801, a second connection end 802 and a third connection end 803, a drainage channel is formed between the first connection end 801, the second connection end 802 and the third connection end 803, an adjusting valve 900 for controlling the on-off of the drainage channel is further arranged on the three-way communication connector 800, the first connection end 801 is connected with the negative pressure aspirator, the second connection end 802 is a second connection end 802 with a hollow cone shape, and the third connection end 803 is a thin pipe-shaped third connection end 803 for connecting a medical T pipe.

Through setting up three-way intercommunication joint 800, the operator can connect the negative pressure aspirator through first link 801 and three-way intercommunication joint 800, can further pass through second link 802 in the three-way intercommunication joint 800, be connected with the mouth of pipe of wound drainage tube, the mouth of pipe of two sets of drainage tubes, the mouth of pipe of catheter, the mouth of pipe of anal canal and the mouth of pipe of stomach tube that clinically use, can connect medical T pipe and the relatively less drainage tube of lumen footpath through third link 803 in the three-way intercommunication joint 800.

It should be noted that, the adjusting valve 900 is located at the center of the three-way communication joint 800, the adjusting valve 900 is a three-way adjusting valve 900, a side hole is provided below the adjusting valve 900, a knob 901 is provided outside the three-way communication joint 800 for controlling the flow direction of the liquid in the three-way communication joint 800, and specifically controlling the switching of the drainage paths inside the first connecting end 801, the second connecting end 802 and the third connecting end 803.

The specific structure of the connection between the three-way communication joint 800 and the regulating valve 900 is the same as that of the passage regulating device disclosed in the patent publication No. CN217311316U, and is not described in detail herein.

The wound drainage tube, the double drainage tube, the catheter, the anal canal and the stomach tube which are clinically used are all in conical design, the part of the catheter opening near the catheter is a thin opening, and the part of the catheter opening far away from the catheter opening is a thick opening, so that the second connecting end 802 is in conical design and can be connected with the wound drainage tube, the double drainage tube, the catheter, the anal canal and the stomach tube in an adaptive way;

in addition, the medical T-tube has a smaller tube diameter, and the specification of the clinically common tube diameter is Fr8-Fr18, which makes the T-tube orifice and the second connecting end 802 unable to be adapted and easy to generate a gap, so the third connecting end 803 orifice is designed into a thin tube shape, and when in use, the thin tube-shaped third connecting end 803 is inserted into the T-tube orifice for being connected with the T-tube in a matching way.

In one embodiment of the present utility model, the negative pressure aspirator is a PP material negative pressure aspirator, the three-way connection 800 is a three-way connection using medical grade polycarbonate and high density polyolefin material, both materials are medical grade, and the volume of the cylinder 103 is 50ml.

Wherein, the rigid connection piece 501 and the cylinder 103 are integrally formed by pp materials, so that the connection strength of the rigid connection piece 501 and the cylinder 103 is ensured, and meanwhile, the pp materials have the characteristics of impact resistance and difficult abrasion, so that the rigid connection piece 501 and the elastic connection piece 502 are not easy to damage when being contacted, and the rigid connection piece 501 is ensured to stably support the piston occluding teeth 400.

As shown in fig. 10, further, the first connection end 801 is screwed with the liquid through port 101.

Through prescribing a limit to the connected mode of first link 801 and liquid through port 101 for the operator can only be through rotatory operation to first link 801 with liquid through port 101 connects, makes simultaneously between first link 801 with liquid through port 101 be difficult for weeping and slippage, in addition makes the operator can freely split and install first link 801 with liquid through port 101 through the spiro union, is convenient for simultaneously use the independence of negative pressure drainage ware and three-way intercommunication joint 800.

Specifically, the inner wall of the liquid through port 101 is provided with a threaded protrusion, and the outer wall of the first connection end 801 is provided with a threaded groove adapted to the threaded protrusion.

Further, the negative pressure connection kit further comprises a first protective cap 1000, a second protective cap 1100 and a third protective cap 1200, wherein the first protective cap 1000 can be in sealing screwing with the first connection end 801, the second protective cap 1100 can be in sealing screwing with the second connection end 802, and the third protective cap 1200 can be in sealing screwing with the third connection end 803;

specifically, the second protective cap 1100 includes a cap body 1101 and an inner plug 1102, the inner plug 1102 is disposed in the cap body 1101, threads are disposed on an inner wall of the cap body 1101 to correspond to threads disposed on an outer wall of the second connection end 802, and the inner plug 1102 is adapted to a connection port inside the second connection end 802 and the inner plug 1102 in a sealing manner;

the inner wall of the first protective cap 1000 is provided with threads corresponding to the threads provided on the inner wall of the first connection end 801, and the first protective cap 1000 can be embedded and screwed into the first connection end 801 to seal the first connection end 801;

the inner wall of the third protection cap 1200 is provided with threads to correspond to threads provided on the outer wall of the third connection end 803, and the third protection cap 1200 can be embedded and screwed into the third connection end 803 to seal the third connection end 803.

By providing the first protective cap 1000, the second protective cap 1100 and the third protective cap 1200, when the three-phase communication joint is not needed to be used, the internal structure is sealed by the first protective cap 1000, the second protective cap 1100 and the third protective cap 1200 so as to meet the sanitary standard and avoid pollution.

Working principle:

when a patient uses the subcutaneous puncture drainage tube and needs negative pressure suction, the liquid passing port 101 is connected with a threaded port of the subcutaneous puncture drainage tube of the patient, an operator holds the handle 600 to pull the piston rod 300, the cylinder engagement teeth 500 and the piston engagement teeth 400 are mutually fixed, at the moment, a negative pressure cavity is formed in the cylinder 103, and effusion in a subcutaneous puncture area of the patient can be sucked into the negative pressure cavity;

when a patient uses a double-set drainage tube, wound drainage or anal canal pus and needs negative pressure drainage, the first connecting end 801 of the three-way communication joint 800 is in threaded connection with the liquid passing port 101, the second protective cap 1100 is removed, the conical second connecting end 802 is inserted into the double-set drainage tube, wound drainage or anal canal, as shown in fig. 8, the regulating valve 900 is rotated along the rotating direction a shown in the figure, the valve direction of the regulating valve is directed to the second connecting end 802 and the first connecting end 801, wherein the drainage passage in the direction of the third connecting end 803 is closed, an operator holds the handle 600 to draw the piston rod 300, the barrel meshing teeth 500 and the piston meshing teeth 400 are mutually fixed, a negative pressure cavity is formed before the barrel 103 and the piston body 200, and pus in the drainage tube can be pumped into the negative pressure cavity;

when a patient uses a T-shaped tube or a drainage tube with a smaller tube cavity diameter and needs negative pressure drainage, the first connecting end 801 of the three-way communication joint 800 is screwed with the liquid through port 101 in a threaded manner, the third protective cap 1200 is removed, the third connecting end 803 is inserted into the tube opening of the T-shaped tube, as shown in fig. 9, the regulating valve 900 is rotated in the rotating direction b in the drawing, the direction of the regulating valve 900 is directed to the direction of the third connecting end 803 and the direction of the first connecting end 801, a drainage passage in the direction of the second connecting end 802 is closed, an operator holds the handle 600 to draw the piston rod 300, the barrel meshing teeth 500 and the piston meshing teeth 400 are mutually fixed, a negative pressure cavity is formed before the barrel 103 and the piston body 200, and pus in the drainage tube can be pumped into the negative pressure cavity;

when the drainage condition of the patient is changed and the negative pressure drainage is changed into natural drainage or flushing, the three-way communication joint 800 can also be used independently when the drainage tube is not matched with the drainage tube joint bag or the mouth of the flushing pipeline, and the drainage tube connected with the interfaces of different tube diameters is flushed and drained.

The technical scheme has the following advantages:

1. the whole structure of the negative pressure aspirator is made of PP material, and the three-way communication joint 800 is made of polycarbonate and high-density polyolefin material; both materials are medical grade, and can be used clinically;

2. the material selection is convenient, the manufacturing structure is simple, and the cost is low;

3. the negative pressure drainage device used clinically is generally used for gastrointestinal decompression, and is suitable for small-caliber connecting pipelines under the condition that drainage is not clean when a small incision is operated;

4. compared with a wall type negative pressure suction device used clinically, the device is unfavorable for patient getting-out activity, is convenient and portable, and is favorable for patient getting-out activity;

5. the first connecting end 801 of the three-way communication connector 800 is in threaded connection with the liquid passing port 101 of the negative pressure aspirator, so that the connection is firm, and the slipping of a pipeline can be effectively prevented;

6. the design of the second connection end 802 and the third connection of the three-way communication joint 800 can effectively meet the matching of drainage tubes with various tube diameters and reduce the occurrence of liquid leakage;

7. when the suction is not smooth or the drainage quantity is full, the sleeve 100 can be replaced in time, the operation is simple and convenient, the effective drainage is maintained, and the retrograde infection of the drainage liquid is prevented;

8. the three-way communication connector 800 can be used independently and is suitable for flushing and draining drainage tubes connected with interfaces of different tube diameters.

In summary, according to the negative pressure aspirator and the negative pressure connection kit, the cylinder occluding teeth 500 are formed as the separate hard connecting piece 501 and the elastic connecting piece 502, and a space is reserved between the hard connecting piece 501 and the elastic connecting piece 502, and the relative position between the piston rod 300 and the cylinder 103 can be limited by matching the hard connecting piece 501 and the elastic connecting piece 502, so that the piston rod 300 can form a negative pressure cavity in the cylinder 103 by pulling the piston body 200, and the negative pressure aspiration can be completed by connecting an external negative pressure aspiration pipeline through the liquid through port 101, wherein the separate hard connecting piece 501 and the elastic connecting piece 502 which are arranged at intervals realize the reduction of the material consumption, thereby reducing the production cost, and simultaneously, the whole quality of the device is reduced, and the device is easy to carry, popularize and use.

The above-described embodiments are only for illustrating the technical spirit and features of the present utility model, and it is intended to enable those skilled in the art to understand the content of the present utility model and to implement it accordingly, and the scope of the present utility model as defined by the present embodiments should not be limited only by the present embodiments, i.e. equivalent changes or modifications made in accordance with the spirit of the present utility model will still fall within the scope of the present utility model.

Claims

1. A negative pressure aspirator, comprising:

the sleeve comprises a liquid passing port, a mounting port and a cylinder body which is connected between the liquid passing port and the mounting port in an extending mode;

the piston rod is connected with the piston body;

characterized by further comprising:

piston engagement teeth connected to the outer periphery of the piston rod;

2. A negative pressure suction apparatus according to claim 1, wherein the length of the elastic connecting piece in the cylinder radial direction is larger than the length of the hard connecting piece in the cylinder radial direction.

3. The vacuum suction apparatus as claimed in claim 2, wherein the hard connecting piece, the elastic connecting piece and the inner wall of the cylinder between them form a hollowed-out triangle structure.

4. The negative pressure suction apparatus according to claim 1, wherein the number of the piston engaging teeth is plural, the plural piston engaging teeth are arranged at intervals in the axial direction of the piston rod, the cylinder engaging teeth are arranged in plural groups, the plural groups of the cylinder engaging teeth are arranged at intervals in the axial direction of the cylinder, the number of the cylinder engaging teeth in each group is plural, and the plural cylinder engaging teeth of each group are arranged at intervals around the cylinder axis line.

5. The vacuum extractor of claim 4 wherein said piston rod includes a first plate and a second plate, said first plate and said second plate being identical in length and said first plate and said second plate being vertically crossed, said first plate width direction and said second plate width direction being provided with said piston snap teeth, respectively.

6. The negative pressure suction apparatus as claimed in claim 1, further comprising a handle, the handle and the piston body being respectively provided at both end portions of the piston rod, wherein the handle is exposed to the outside of the cylinder body.

7. The negative pressure aspirator according to claim 1, characterized in that the piston body is a piston body of a double-layer rubber cushion.

8. The negative pressure aspirator of claim 1, further comprising a data scale located on the outer wall of the barrel, wherein the barrel is a transparent barrel.

9. The negative pressure connection kit is characterized by comprising the negative pressure aspirator according to any one of claims 1-8, and further comprising a three-way communication joint, wherein the three-way communication joint is provided with a first connecting end, a second connecting end and a third connecting end, a drainage passage is formed among the first connecting end, the second connecting end and the third connecting end, an adjusting valve for controlling the on-off of the drainage passage is further arranged on the three-way communication joint, the first connecting end is connected with the negative pressure aspirator, the second connecting end is a hollow conical second connecting end, and the third connecting end is a tubule-shaped third connecting end for connecting a medical T tube.

10. The negative pressure connection kit of claim 9, wherein the first connection end is threadably connected to the fluid port.