JP3993928B2 - Suction pressure pulsating breast pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a breast pump, and more particularly to a breast pump for extracting breast milk from the breast for storage so that it can be drunk later by the newborn.
[0002]
[Prior art]
This type of breast pump may also be referred to as a breast pump and is typically divided into two types. That is, there are one driven by a motor and one manually operated. This type of so-called breast pump, whether motor-driven or manually operated, is pulsatile suction pressure using a reciprocating piston pump because it is easy to produce the same effect as an actual infant sucking breast milk. The mainstream is a suction pressure pulsating type that milks a sachet by placing it on the breast.
[0003]
As a conventional example of such a suction pressure pulsation type breast pump, there are those disclosed in, for example, JP-A-1-317448 and US Pat. No. 4,929,229. These conventional suction pressure pulsation type breast pumps collect a milk cover that is attached to the breast in use and has an opening for receiving the nipple, and milked in communication with the inside of the breast cover. A collection chamber for reciprocating, a reciprocating piston pump for creating suction pressure inside the breast cover, and a connection for connecting the breast covering and reciprocating piston pump. ing.
[0004]
In the collection chamber, when the suction pressure is generated in the breast cover by the reciprocating piston pump, the inside of the collection chamber is sealed from the outside, but the collected milk is sent to the outside. For this purpose, a disk is provided that operates to open the inside of the collection chamber to the outside. Also, in order to prevent milked milk from entering the reciprocating piston pump part between the breast cover part and the collection chamber part and in the middle of the vacuum line to the reciprocating piston pump part. A separation wall or the like is also provided.
[0005]
According to such a conventional suction pressure pulsation type breast pump, if a suitable container is connected to the collection chamber, a breast cover is attached to the breast, and the reciprocating piston pump is operated, the breast Because of the pulsating negative pressure or vacuum generated in the cover, the nipple and adjacent parts are sucked and pulled into a narrow part in the nipple cover. Such pulling action causes the breast to be massaged and compressed so that the infant sucks, resulting in the extraction of breast milk. The milk extracted in the nipple cover is guided to the collection chamber and is collected in a container connected thereto when the disk in the collection chamber allows opening to the outside.
[0006]
[Problems to be solved by the invention]
However, such a conventional breast pump has a complicated internal structure such as a breast cover and a collection chamber, and the cost is high. In addition, cleaning after use is very difficult, and there are no hygiene problems. there were.
[0007]
Before the milked milk is collected into a container for later use, it will contact the separating wall of the breast cover and the disk in the collection chamber, etc. Is difficult.
[0008]
Moreover, the breast milk that has flowed into the piston pump section beyond the separation wall can only be discarded, and the collection rate of the breast milk is lowered accordingly.
[0009]
Breast milk tends to stick to the disk, and malfunctions are likely to occur. In addition, the timing at which the breast milk is delivered to the collection container tends to be irregular.
[0010]
Since the suction pressure generated by the piston pump part must be applied to the inside of the breast covering part through the connection part and the collection chamber part, the negative pressure space is large, and in order to generate the necessary suction pressure, it is so large. Power is required. Therefore, when the piston pump is driven by an electric motor, the power consumption increases accordingly. This is a particularly serious problem in the case of battery power.
[0011]
An object of the present invention is to provide a suction pressure pulsation type breast pump capable of eliminating the problems of the conventional techniques as described above.
[0012]
[Means for Solving the Problems]
A suction pressure pulsating breast pump according to the present invention comprises a breast cover having an opening that is attached to a breast and receives a teat in use, and the breast cover is disposed on the opposite side of the breast cover from the breast cover. A cylinder portion that defines a cylinder space that communicates with the piston portion, a piston portion that is inserted into the cylinder portion, and a reciprocating motion of the piston portion within the cylinder space to create a pulsating suction pressure within the breast covering portion. The inner wall dimension of the cylinder part that defines the cylinder space is close to the breast covering part and has a predetermined length by closely contacting the outer periphery of the piston head of the piston part. A suction part is provided, and on the side far from the breast covering part, a slight gap is provided between the piston part and the outer periphery of the piston head, and the milk milked by the suction pressure is provided. Is selected to provide a milk collecting unit for collecting the milk, and the collected milk can be sent to the outside at the bottom of the cylinder unit corresponding to the milk collecting unit. A hole is formed.
[0013]
According to one embodiment of the present invention, a taper portion is formed on the inner wall of the cylinder portion at a portion corresponding to the transition portion between the suction portion and the milk collection portion.
[0014]
According to one embodiment of the present invention, the cylinder portion is provided with a container connecting means for connecting a milk collection container for collecting milked milk at a position surrounding the hole portion. It has been.
[0015]
According to one embodiment of the present invention, the drive unit is connected to an electric motor and a rotary shaft of the electric motor, and converts the rotary motion of the rotary shaft into a reciprocating motion in the axial direction of the cylinder space. And a piston shaft of the piston portion is connected to the crank means.
[0016]
According to another embodiment of the present invention, the breast cover is provided with suction pressure adjusting means.
[0017]
According to still another embodiment of the present invention, the breast covering portion and the cylinder portion are integrally formed as a first component, and the drive portion is formed on the first component. On the other hand, it is arranged inside a housing formed as a second detachable component.
[0018]
According to a preferred embodiment of the present invention, the piston portion is adapted to be removed from the cylinder portion together with the housing when the housing is removed from the first component. The piston head of the part is detachable from the tip of the piston shaft.
[0019]
According to one preferred embodiment of the present invention, a piston shaft guide for linearly reciprocating the piston shaft of the piston portion is formed on the inner wall of the housing.
[0020]
According to another preferred embodiment of the invention, the housing is provided with a buckle for fixing to the first component.
[0021]
According to an embodiment of the present invention, the buckle is provided with a grip portion that can be gripped with one hand.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Next, based on an accompanying drawing, the present invention is explained in detail about the example of the present invention.
[0023]
FIG. 1 is a schematic cross-sectional view showing a suction pressure pulsation type breast pump as one embodiment of the present invention in a state where a milk collection container is connected in an assembled state, and FIG. 2 is a suction pressure pulsation of FIG. It is a schematic sectional drawing shown in the state which decomposed | disassembled some component parts of the type | formula milking machine. As shown in FIGS. 1 and 2, the suction pressure pulsating breast pump of this embodiment mainly includes a breast cover 10 having an opening 11 that is attached to a breast and receives a teat in use. A cylinder part 20 defining a cylinder space communicating with the inside of the breast cover part 10 on the side opposite to the opening part 11 of the breast cover part 10, a piston part 50 inserted in the cylinder part 20, and the piston part 50 in the cylinder space A drive unit 60 is provided for reciprocating the inside of the breast covering unit 10 so as to generate a suction pressure in a pulsating manner.
[0024]
In this embodiment, the inner wall dimension of the cylinder portion 20 that defines the cylinder space has a predetermined length by bringing the outer periphery of the piston head 51 of the piston portion 50 as will be described later into close contact with the breast cover portion 10. In order to provide the suction portion 21 and to provide a slight gap between the piston portion 50 and the outer periphery of the piston head 51 on the side far from the breast covering portion 10, the milk milked by the suction pressure is collected outside. The milk collection unit 22 is selected. A tapered portion 23 is formed on the inner wall of the cylinder portion 20 at a portion corresponding to the transition portion between the suction portion 21 and the milk collecting portion 22.
[0025]
A hole 24 is formed at the bottom of the cylinder portion 20 corresponding to the milk collecting portion 22 so that the milk collected therein can be sent to the outside. As is well shown in the partial cross-sectional view of FIG. 3, in this embodiment, the hole 24 is located at the front end of the piston head 51 at the last retracted position (the position indicated by the phantom line in FIG. 1). A pair of substantially square front holes 24A, a substantially square rear center hole 24B, and a pair of left and right rear sides of a substantially quarter circle, which are arranged behind the last retracted position of the piston head 51. It is formed from the part hole 24C.
[0026]
Furthermore, in this embodiment, the cylinder part 20 is provided with a container connection part 30 for connecting the milk collection container 1 for collecting milked milk at a position surrounding the hole part 24. ing. The container connecting portion 30 is formed in a cylindrical shape as a whole so as to extend downward from the bottom surface portion of the milk collecting portion 22 of the cylinder portion 20. As shown well in FIG. 1, a screw portion 31 for screwing the screw portion 1 </ b> A of the mouth portion of the milk collection container 1 is formed on the inner periphery of the lower end portion of the container connection portion 30.
[0027]
In this embodiment, the breast covering portion 10 is formed with an attachment portion 12 for detachably attaching the suction pressure adjusting portion 40. The attachment portion 12 is composed of a double cylindrical wall formed so as to surround a vent hole 13 formed in the wall portion of the milk covering portion 10. The detailed structure and operation of the suction pressure adjusting unit 40 will be described later. In this embodiment, as well shown in FIG. 2, the milk cover portion 10 including the attachment portion 12 and the cylinder portion 20 including the container connection portion 30 are made of a suitable material, for example, It is molded integrally with a plastic material.
[0028]
In this embodiment, the piston portion 50 is composed of a piston head 51 and a piston shaft 52 that can be detachably attached to the front end of the piston head 51. 2, a female screw hole 52A is formed at the center of the front end of the piston shaft 52, and a male screw 51A is formed at the rear end shaft of the piston head 51. The piston head 51 can be attached and fixed to the piston shaft 52 by screwing the male screw 51A into the 52A.
[0029]
In this embodiment, the drive unit 60 is formed as a second component part that is detachable with respect to the first component part that constitutes the milk cover 10, the attachment part 12, the cylinder part 20, and the container connection part 30. The housing 61 is provided. The housing 61 is also integrally formed of a suitable material, for example, a plastic material. The drive unit 60 is connected to an electric motor 62 disposed in the housing 61 and a rotating shaft of the electric motor 62, and converts the rotary motion of the rotary shaft into a reciprocating motion in the axial direction of the cylinder space. A crank mechanism 63 is provided. In this embodiment, a gear unit 64 is interposed between the electric motor 62 and the crank mechanism 63, and the gear unit 64 appropriately changes the rotational speed of the rotating shaft of the electric motor 62 to thereby change the crank mechanism. Tell 63. In the housing 61, there is also provided a battery portion 65 that can be fitted with a battery as a power source for energizing the electric motor 62. Of course, the housing 61 is provided with an appropriate switch (not shown) capable of turning on / off such a battery power supply from the outside.
[0030]
In this embodiment, the crank mechanism 63 is connected to the output shaft of a gear unit 64 that changes the rotational speed of the electric motor 62 and rotates as shown in the partial cross-sectional view of FIG. Crank arm 63A, a substantially O-shaped moving element 63B in which the free end of the crank arm 63A is loosely engaged, and a pair of piston shafts formed in parallel along the inner wall of the housing 61 It consists of a guide 63C. The piston shaft guide 63C guides the movement of the moving element 63B so as to reciprocate the piston shaft 52 of the piston portion 50 in a more linear manner by sandwiching both side edges of the moving element 63B. The linear motion of the moving element 63B in the axial direction of the cylinder part 20 is performed by restricting both side surfaces of the moving element 63B to the parallel inner walls facing the housing 61. The rear end of the piston shaft 52 of the piston portion 50 is connected to the center portion of the mover 63B of the crank mechanism 63.
[0031]
Furthermore, in this embodiment, a buckle 70 is attached around the housing 61, and the buckle 70 constitutes the milk cover portion 10, the attachment portion 12, the cylinder portion 20, and the container connection portion 30. When the housing 60, which is the second component, is assembled to the first component as shown in FIG. 1, it engages with the outer periphery of the container connecting portion 30 to fix the assembled state of both. Acts. Further, the buckle 70 is provided with a grip portion 71 that allows the whole breast pump thus combined to be gripped with one hand.
[0032]
Next, the detailed structure and operation of the suction pressure adjusting unit 40 inserted into the attachment part 12 of the milk wrap 10 will be described with reference to FIGS. 5 and 6 in particular. FIG. 5 is an exploded perspective view of the disassembled parts of the suction pressure adjusting unit 40, and FIG. 6 is a partially broken perspective view for showing details of the case structure of the suction pressure adjusting unit 40. The suction pressure adjustment unit 40 in this embodiment also functions as a pressurization release valve. As shown in FIG. 5, for example, a case 41 formed of a plastic material and, for example, a metal A plate 42 formed of a thin plate, a cushion 43 formed of, for example, a rubber material, a top 44 formed of, for example, a plastic material, and an adjustment knob 45 formed of, for example, a plastic material are provided. .
[0033]
First, the case 41 is formed in a cylindrical shape as a whole, and its lower end is dimensioned so that it can be inserted into the attachment part 12 of the milk wrap 10 as well shown in FIG. A peripheral groove 41A for mounting the O-ring 46 is provided on the outer periphery of the lower end portion as well shown in FIG. The O-ring 46 is for improving the adhesion when the lower end portion of the case 41 is inserted into the mounting portion 12. The upper end of the case 41 creates a recess that can accommodate the plate 42, the cushion 43, and the top 44, and the bottom surface of the recess has a through hole 41 </ b> B that communicates with the vent hole 13 of the milk cover 10. A bottom groove 41C is formed. In addition, an attachment groove 41D and an attachment column 41E for attaching and fixing the plate 42 and the cushion 43 are formed on the bottom surface of the recess.
[0034]
The plate 42 has a hole 42A for a pressure release valve having a relatively large diameter at one place on the periphery and a pressure adjusting hole 42B having a relatively small diameter at a plurality of places on both sides of the hole 42A. Is formed. These holes 42 </ b> B are configured so that the outside air can be sucked into the milk covering portion 10 when a negative pressure is to be formed in the milk covering portion 10 by the action of a piston-cylinder described later. It is intended to adjust the magnitude of the negative pressure. Further, the plate 42 is formed with an attachment hole 42C through which the attachment column 41E of the case 41 is inserted, and an insertion hole 42D through which an attachment projection 43C of the cushion 43 described later is inserted.
[0035]
The cushion 43 is formed with a cantilever valve 43A at the center thereof, and a pressure adjusting hole 43B is formed at a position corresponding to each of the holes 42B formed in the plate 42 in the periphery. ing. The valve 43A normally closes the pressure release valve hole 42A of the plate 42, but when the inside of the milk wrap 10 is to be pressurized by the action of a piston-cylinder as described later, The hole 42A is opened to release the applied pressure. Further, the peripheral portion of the hole 43B on the upper surface of the cushion 43 is raised so that a space is created between the lower surface of the top 44 and the upper surface of the cushion 43, which will be described later. Further, the lower surface of the cushion 43 is provided with a mounting projection 43C that is inserted into the insertion hole 42D of the plate 42 and can be fitted into the mounting groove 41D of the case 41. A receiving hole (not shown) for receiving the tip of the column 41E is provided.
[0036]
The top 44 is shaped to be attached and fixed to the inside of the lower surface of the adjustment knob 45, and a notch 44A for pressure adjustment is formed in a part of the outer periphery of the lower surface. In other words, in a state where the lower surface of the top 44 is in contact with the upper surface of the cushion 43, only the hole 43B located at a position corresponding to the notch recess 44A on the lower surface of the top 44 can suck outside air. On the other hand, when the pressure release valve hole 42A of the plate 42 is opened by the valve 43A, the pressure can be released through the space formed between the upper surface of the cushion 43 and the lower surface of the top 44 as described above. is there.
[0037]
The details of the lower surface of the adjustment knob 45 are not shown in the figure, but are shaped so that the upper end of the top 44 can be attached and fixed. As shown well in FIG. 1, the adjustment knob 45 is shaped to be inserted so as to be rotatable with respect to the upper end of the case 41. That is, when the adjustment knob 45 is rotated with respect to the case 41, the top 44 is rotated together, so that the number of the holes 43B of the cushion 43 and the holes 42B of the plate 42 which are opened by the notch recess 44A. Changed so that the pressure can be adjusted.
[0038]
Next, the overall operation of the suction pressure pulsating breast pump having the above-described configuration will be described. As shown in FIG. 1, the user who is going to milk the milk first assembles the milk collecting container 1 by screwing the screw part 1A of the milk collecting container 1 into the screw part 31 of the container connecting part 30, and the piston. The drive unit 60 is united with the milk covering unit 10 so that the unit 50 is inserted into the cylinder unit 20, and this uniting is locked by the buckle 70.
[0039]
Then, the user holds the grip portion 71 and puts the milk cover portion 10 against the breast through the opening 11 of the milk cover portion 10 of the breast pump assembled in this manner. Then, the suction knob 45 of the suction pressure adjusting unit 40 is rotated to set the suction pressure to a desired value. Thereafter, a power switch (not shown) provided in the drive unit 60 is turned on.
[0040]
Then, the electric motor 62 is energized, and the crank arm 63A of the crank mechanism 63 is rotated at a predetermined rotational speed via the gear unit 64 by the rotation of the rotating shaft of the electric motor 62. By such rotation of the crank arm 63A, the moving element 63B is guided by the inner walls on both sides of the housing 61 and the piston shaft guide 63C, and between the position indicated by the solid line and the position indicated by the phantom line in FIGS. Will be able to reciprocate. Therefore, the piston shaft 52 connected to the moving element 63B is also reciprocated, and the piston head 51 reciprocates between the position indicated by the solid line in FIG. Be moved.
[0041]
Milking is performed by such a reciprocating motion of the piston head 51 in the cylinder portion 20. Next, details of the motion will be described. First, in FIG. 1, the piston head 51 is in a position indicated by an imaginary line, that is, a position between the front hole 24 </ b> A of the hole 24 at the bottom of the milk collection unit 22, the rear center hole 24 </ b> B, and the rear side hole 24 </ b> C. Assume that there is. This position is the last retracted position of the piston head 51. When the piston head 51 is moved forward from this position and enters the suction part 21 beyond the taper part 23, the air in the milk wrap 10 begins to be compressed, and the pressure is increased. To do. However, the air in the milk wrap 10 is released to the outside through the vent hole 13 and the pressure release valve hole 42 </ b> A by opening the valve 43 </ b> A of the pressure adjusting unit 40 due to the increase in pressure. Therefore, the piston head 51 can be smoothly pushed into the suction part 21 of the cylinder part 20. Then, the piston head 51 moves to the position indicated by the solid line in FIG.
[0042]
Next, the piston head 51 starts to be moved backward from this most advanced position. Then, in this suction part 21, since the outer periphery of the piston head 51 is in close contact with the inner wall of the cylinder part, suction pressure starts to be generated in the milk covering part 10. With such a suction pressure, the breast mounted on the milk wrap 10 is squeezed and milking begins. Such a milking action is continued until the piston head 51 moves back to the tapered portion 23 corresponding to the transition portion between the suction portion 21 and the milk collecting portion 22. When the piston head 51 moves backward beyond the taper portion 23, the milk collecting portion 22 loses the adhesion between the outer periphery of the piston head 51 and the inner wall of the cylinder portion 20, so that the generation of further suction pressure is stopped. . When the piston head 51 reaches the last retracted position indicated by the phantom line, the milked milk is connected to the opened hole 24 mainly through the front hole 24A and through the inside of the container connecting part 30. It falls into the container 1 and is collected there. Milk that has circulated to the back of the piston head 51 through a slight gap between the outer periphery of the piston head 51 and the inner wall of the cylinder portion 20 passes through the rear center hole 24B and the rear side hole 24C of the hole 24 to 1 can be collected.
[0043]
The piston head 51 is again moved forward from this last retracted position, and the operation as described above is repeated. In this way, suction pressure is applied to the breast mounted in the milk cover 10 in a pulsating manner, and milking is continued in the same manner as an infant actually sucks breast milk. When the user feels uncomfortable with the suction pressure during such a milking operation, the user can also rotate the adjustment knob 45 to adjust the suction pressure so that there is no uncomfortable feeling.
[0044]
After the appropriate amount of milking is made in this way, the user removes the breast pump from his / her breast, removes the container 1 from the container connecting portion 30, and keeps the container 1 as it is in an appropriate place. Can be taken by infants later. Of course, it is also free to transfer the milked milk from the container 1 to another suitable container for storage. In order to make the subsequent use of this milking device hygienic, immediately after use, from the first component part of the milk cover 10, the cylinder part 20 and the container connection part 30, the drive part 60 and the piston It is preferable to remove the second component of the portion 50, further remove the pressure contact portion 40 from the mounting portion 12, and remove the piston head 51 from the tip of the piston shaft 52 to clean each portion.
[0045]
In the above-described embodiment, an electric motor is used as a driving source for the piston portion. However, the present invention is not limited to this, and for example, the piston portion can be manually operated. .
[0046]
【The invention's effect】
By adopting a structure in which the cylinder part is directly connected to the milk covering part, the structure becomes very simple, the cost can be reduced, and the cleaning after use becomes very simple, and there is no sanitary problem.
[0047]
Milked breast milk can be collected directly into a container for subsequent use, so it is easier to keep the hygienic condition of the breast milk better.
[0048]
Since almost all of the milked milk can be collected in the container through the hole 24 of the milk collecting part 22 of the cylinder part, the collection rate of the breast milk can be increased.
[0049]
The milk flow path of the milked milk has a very simple structure, so that the milk does not stick to the components, so malfunctions occur and the milk goes into the collection container. There is no possibility that the timing of transmission is irregular.
[0050]
Since the suction pressure that should be generated by the piston pump is only inside the milk cover and the suction part that is part of the cylinder part, the negative pressure space is minimized and it is necessary to generate the required suction pressure. Therefore, when the piston pump is driven by an electric motor, less power is consumed. Since the electric motor to be used can also be made small, the size of the whole breast pump can be made small accordingly.
[0051]
Milking closer to the sense that an infant sucks breast milk can be performed with a constant suction pressure of a certain period.
[0052]
By providing an adjustment unit with a pressure release valve that shares the suction pressure adjustment unit and the pressure release valve in the milk cover, the suction pressure can be adjusted while milking easily, and milking without a sense of incongruity is performed. be able to.
[0053]
By making this adjustment part with a pressure release valve detachable with respect to the milk cover part, it becomes easy to clean the milk cover part with a simple structure.
[0054]
By devising the structure of the hole provided in the milk collecting unit in order to collect the milked milk into the container, the collection rate of the milked milk can be further increased.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a suction pressure pulsation type breast pump as an embodiment of the present invention in a state where a milk collection container is connected in an assembled state.
FIG. 2 is a schematic cross-sectional view showing some components of the suction pressure pulsating breast pump of FIG. 1 in an exploded state.
FIG. 3 is a partial cross-sectional view for illustrating in detail the configuration of the hole of the milk collecting unit of the breast pump of FIG. 1;
4 is a partial cross-sectional view showing details of a crank mechanism of the breast pump of FIG. 1; FIG.
FIG. 5 is an exploded perspective view of the disassembled parts of the suction pressure adjusting unit 40 of the breast pump of FIG. 1;
6 is a partially broken perspective view showing details of the structure of the case of the suction pressure adjusting unit in FIG. 5;
[Explanation of symbols]
1 Milk collection container
10 Milk cover
11 opening
20 Cylinder part
21 Suction unit
22 Milk Collection Department
23 Taper
24 holes
30 Container connection
40 Suction pressure adjustment unit
50 Piston part
51 piston head
52 Piston shaft
60 Drive unit
61 Housing
62 Electric motor
63 Crank mechanism
63A Crank arm
63B mover
63C Piston shaft guide
64 Gear unit
65 Battery section

Claims (10)

A breast cover having an opening that is attached to the breast in use and receives the nipple, and a cylinder that defines a cylinder space communicating with the inside of the breast cover on the opposite side of the opening of the breast cover; A piston part inserted in the cylinder part, and a drive part for causing the piston part to reciprocate in the cylinder space so as to generate suction pressure in the breast covering part pulsatingly, The inner wall dimension of the cylinder part that defines the cylinder space is close to the breast cover part to provide a suction part having a predetermined length by closely contacting the outer periphery of the piston head of the piston part and far from the breast cover part. On the side, a milk collecting part for collecting a milk expressed by the suction pressure to the outside by providing a slight gap between the piston part and the outer periphery of the piston head. The bottom of the cylinder portion corresponding to the milk collecting portion is formed with a hole portion that allows the collected milk to be sent to the outside. Suction pressure pulsating milking machine. The suction pressure pulsation type breast pump according to claim 1, wherein a taper portion is formed on an inner wall of the cylinder portion at a portion corresponding to a transition portion between the suction portion and the milk collecting portion. The suction according to claim 1 or 2, wherein the cylinder part is provided with a container connection means for connecting a milk collection container for collecting milked milk at a position surrounding the hole part. Pressure pulsating breast pump. The drive unit includes an electric motor, and a crank unit connected to a rotating shaft of the electric motor for converting the rotating motion of the rotating shaft into a reciprocating motion in the axial direction of the cylinder space, The suction pressure pulsation type breast pump according to claim 1, 2 or 3, wherein the piston shaft of the piston portion is connected to the crank means. The suction pressure pulsation type breast pump according to claim 1, 2, 3, or 4, wherein the breast covering portion is provided with suction pressure adjusting means. The breast covering part and the cylinder part are integrally formed as a first constituent part, and the driving part is formed as a second constituent part that is detachable from the first constituent part. The suction pressure pulsation type breast pump according to any one of claims 1 to 5, which is disposed inside the housing. The piston portion is configured to be removed from the cylinder portion together with the housing when the housing is removed from the first component, and the piston head of the piston portion is a tip of the piston shaft. The suction pressure pulsation type breast pump according to claim 6, which is detachable from the part. The suction pressure pulsation type breast pump according to claim 6 or 7, wherein a piston shaft guide for linearly reciprocating the piston shaft of the piston portion is formed on an inner wall of the housing. The suction pressure pulsation type breast pump according to claim 6, 7 or 8, wherein the housing is provided with a buckle for fixing to the first component. The suction pressure pulsating breast pump according to claim 9, wherein the buckle is provided with a grip portion that can be gripped with one hand.

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