CN211272845U - Accommodating piece, pump head and pressure pump - Google Patents

Abstract

The holding piece, pump head and force pump that this embodiment provided relate to the medical instrument field. Aims to solve the problem that dust easily enters a pump body and a telescopic rod is flexible and easily causes harm to people in the existing infusion pressure pump. The accommodating piece is used for being connected to the outside of the pump body, the pump body is provided with an accommodating cavity used for accommodating the piston rod, the accommodating piece is provided with a sliding channel used for being communicated with the accommodating cavity, and the sliding channel is used for enabling the free end of the piston rod extending out of the outside of the pump body to extend into the accommodating piece. The pump head includes the pump body and holding piece. The pressure pump includes a pump head. The accommodating piece is connected to the outside of the pump body, a sliding channel in the accommodating piece is communicated with the accommodating cavity and enables the free end of the piston rod extending out of the accommodating cavity to extend into the accommodating piece, and the accommodating piece has a dustproof effect on the free end of the piston rod in the reciprocating movement process of the piston rod, so that external dust is prevented from being brought into the pump body in the expansion process of the free end of the piston rod; meanwhile, the accommodating piece has a protection effect on the free end of the piston rod, and personal injury to people in the telescopic process is avoided.

Description

Accommodating piece, pump head and pressure pump

Technical Field

The utility model relates to the field of medical equipment, particularly, relate to a holding piece, pump head and force pump.

Background

In the clinical submucosal resection, the endoscopic submucosal injection uplift can be realized through an infusion pressure pump. In the current infusion force pump, there is the dust and easily gets into the pump body and the flexible problem that easily causes the injury to the people of telescopic link.

SUMMERY OF THE UTILITY MODEL

The purpose of the utility model includes, for example, provide a holding piece, it can improve among the current infusion force pump, the dust easily gets into the pump body and the flexible problem that easily causes the injury to the people of telescopic link.

The utility model discloses an aim still includes, provides a pump head, and it can improve current infusion force pump, and the dust easily gets into the pump body and the flexible problem that easily causes the injury to the people of telescopic link.

The utility model discloses an aim still includes, provides a force pump, and it can improve current infusion force pump, and the dust easily gets into the pump body and the flexible problem that easily causes the injury to the people of telescopic link.

The embodiment of the utility model discloses a can realize like this:

the embodiment of the utility model provides a holding piece for connect in the outside of the pump body, the pump body has the accommodation chamber who is used for the holding piston rod, and holding piece is provided with the sliding channel who is used for with the accommodation chamber intercommunication, and sliding channel is used for making the piston rod stretch out the outside free end of the pump body and stretches into.

In addition, the embodiment of the present invention provides a receiving member, which can further have the following additional technical features:

optionally: one end of the accommodating piece, which is far away from the pump body, is provided with a stop part which extends towards the center of the sliding channel relative to the inner wall of the sliding channel so as to stop the free end of the piston rod.

Optionally: the accommodating piece is provided with an air hole for communicating the sliding channel with the outside of the accommodating piece.

Optionally: the air holes are positioned at one end of the accommodating piece far away from the pump body.

Optionally: the air hole is positioned at the center of the end part of the accommodating piece and is opposite to the free end of the piston rod.

Optionally: the accommodating piece comprises an installation cover and an accommodating barrel connected with the installation cover, the installation cover and the accommodating barrel jointly define a sliding channel, and the installation cover is detachably connected with the pump body.

Optionally: the mounting cover and the accommodating barrel are integrally formed.

Optionally: the accommodating piece also comprises a fastener;

the installation lid is provided with first hole, and first hole is used for corresponding with the second hole that sets up on the pump body, and the fastener cooperates with first hole and second hole simultaneously to cover the installation and fix to the pump body.

Optionally: the number of the first holes, the second holes and the fasteners is multiple and in one-to-one correspondence, and the second holes are uniformly distributed around the circumference of the piston rod.

Optionally: the mounting cover is provided with a first end face and a second end face which are arranged oppositely, the first end face is used for being in sealing contact with the pump body, the accommodating cylinder is a cylinder and is connected with the second end face of the mounting cover, and the axis of the accommodating cylinder is perpendicular to the second end face.

The embodiment of the utility model provides a pump head is still provided. The pump head includes the pump body and holding piece, and the holding piece is connected with the pump body.

Optionally: the pump head also comprises a piston rod and a piston connected with the piston rod, the piston is positioned in the accommodating chamber, and the piston is connected with the inner wall of the accommodating chamber in a sealing manner in a sliding manner.

Optionally: the piston is located the middle part of piston rod, and the both ends of piston rod form drive end and free end respectively, and the drive end is used for being connected with drive arrangement, and the free end stretches into slide channel slidable.

Optionally: the piston comprises a piston body and an elastic sealing piece, the piston body is connected with the piston rod, the piston body is provided with an annular groove, the sealing piece is annular, and the annular groove is sleeved with the sealing piece and is in sealing connection with the inner wall of the accommodating cavity.

Optionally: the pump body also comprises a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve;

the piston divides the accommodating cavity into a first cavity and a second cavity, the pump body is provided with a first liquid inlet, a first liquid outlet, a second liquid inlet and a second liquid outlet, the first one-way valve is arranged at the first liquid inlet, the second one-way valve is arranged at the first liquid outlet, the third one-way valve is arranged at the second liquid inlet, and the fourth one-way valve is arranged at the second liquid outlet;

the first liquid inlet and the first liquid outlet are both communicated with the first cavity, and the second liquid inlet and the second liquid outlet are both communicated with the second cavity;

when the pump head is provided with a piston moving towards a first preset direction, fluid in the first chamber flows out through the first liquid outlet, and fluid at the second liquid inlet flows into the second chamber in a first state; and when the piston moves towards a second preset direction opposite to the first preset direction, the fluid at the first liquid inlet flows into the first cavity, and the fluid in the second cavity flows out through the second liquid outlet.

The embodiment of the utility model provides a pressure pump is still provided, and pressure pump includes the pump head.

The utility model discloses beneficial effect of holding piece, pump head and force pump includes, for example:

the accommodating piece is connected to the outside of the pump body, a sliding channel arranged in the accommodating piece is used for accommodating the free end of the piston rod extending out of the accommodating cavity, the accommodating piece has a dustproof effect on the free end of the piston rod, and dust is prevented from adhering to the free end of the piston rod and being brought into the accommodating cavity; meanwhile, the piston rod has high expansion frequency, and the accommodating piece has a protection effect on the free end of the piston rod, so that personal injury to people is not easily caused.

The pump head comprises a pump body and an accommodating piece, and under the dustproof and protective effects of the accommodating piece, external dust is not easily brought into the pump body in the reciprocating movement of the piston rod, and personal injury is not easily caused to people.

The pressure pump comprises the pump head, the pump head comprises the accommodating piece, the accommodating piece is connected to the outside of the pump body, the free end of the piston rod extending out of the pump body has dustproof and protective effects, external dust is not easily brought into the pump body in the telescopic process of the piston rod, and personal injury is not easily caused to people.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a pump head according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a pump head according to an embodiment of the present invention;

fig. 3 is a schematic partial structural diagram of a pump head according to an embodiment of the present invention.

Icon: 11-a pump head; 12-a drive device; 100-a pump body; 101-a first liquid inlet; 102-a first liquid outlet; 103-a second liquid inlet; 104-a second liquid outlet; 111-a first one-way valve; 112-a second one-way valve; 113-a third one-way valve; 114-a fourth one-way valve; 120-a containment chamber; 121-a first chamber; 122-a second chamber; 200-a container; 201-sliding channel; 202-air holes; 210-mounting a cover; 211-a first end face; 212-a second end face; 213-a first well; 220-a containing cylinder; 300-a piston rod; 310-a drive end; 320-free end; 400-a piston; 410-a piston body; 420-an annular groove; 500-liquid inlet pipe; 510-a liquid outlet pipe; 530-a stop valve; 600-sterile liquid tank; 610-surgical instruments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

The problem that dust easily enters a pump body in the reciprocating movement process of a piston rod of an existing infusion pressure pump is solved. The inventor further studies and finds that the two ends of the piston rod extend out of the pump body, and the part of the piston rod extending out of the pump body is in contact with the outside and is easy to adhere dust, so that the dust adhered to the free end is easily brought into the pump body in the reciprocating movement process of the piston rod, the normal use of the pump body is affected, and the accommodating piece, the pump head and the pressure pump provided by the embodiment can improve the technical problem.

Referring to fig. 1, an accommodating member 200 according to an embodiment of the present invention is configured to be connected to an outside of a pump body 100, the pump body 100 has an accommodating chamber 120 configured to accommodate a piston rod 300, the accommodating member 200 is provided with a sliding channel 201 configured to communicate with the accommodating chamber 120, and the sliding channel 201 is configured to allow a free end 320 of the piston rod 300 extending out of the pump body 100 to extend into the sliding channel.

The accommodating member 200 is provided with a sliding channel 201, and after the accommodating member 200 is connected with the pump body 100, the sliding channel 201 is communicated with the accommodating chamber 120. The free end 320 of the piston rod 300 extends out of the pump body 100 and slidably extends into the sliding channel 201, and during the reciprocating movement of the piston rod 300, the accommodating part 200 has a dustproof effect on the free end 320 of the piston rod 300, so as to prevent external dust from adhering to the free end 320 of the piston rod 300, thereby preventing the piston rod 300 from bringing the external dust into the accommodating chamber 120 during the reciprocating movement, and preventing the liquid medicine from being polluted and unusable. Meanwhile, the accommodating part 200 also has a protection function on the free end 320 of the piston rod 300, so as to prevent personal injury to people during the extension and retraction process of the piston rod 300.

Referring to the relative position in fig. 1, the receiving member 200 is located at the left end of the pump body 100, and the sliding channel 201 provided in the receiving member 200 extends laterally. Specifically, the sliding channel 201 is a cylindrical channel that is a sliding fit with the free end 320 of the piston rod 300. The left end of the piston rod 300 is a free end 320, the free end 320 of the piston rod 300 extends out of the pump body 100, and the free end 320 of the piston rod 300 is matched with the sliding channel 201 of the accommodating part 200 in the process that the piston rod 300 moves left and right. The receiving member 200 provides dust protection and protection to the free end 320 of the piston rod 300.

Referring to fig. 2, in the present embodiment, one end of the accommodating element 200 away from the pump body 100 is provided with a stop portion extending toward the center of the sliding channel 201 relative to the inner wall of the sliding channel 201 to stop the free end 320 of the piston rod 300. The stop portion is protruded from the inner wall of the sliding channel 201, and during the reciprocating movement of the piston rod 300, the free end 320 of the piston rod 300 abuts against the stop portion, so that the piston rod 300 stops. That is, the position of the stop portion limits the length of the free end 320 of the piston rod 300 moving in the sliding channel 201, and the stop portion is provided to prevent the piston rod 300 from moving beyond the set movement stroke range in abnormal situations, so as to protect the piston rod 300.

Specifically, referring to fig. 2, the stop portion is an end portion of the accommodating member 200 away from the pump body 100. The stopper portion is provided at an end of the slide passage 201 remote from the pump body 100. The length of the sliding channel 201 limits the range of movement of the piston rod 300.

With continued reference to fig. 2, in the present embodiment, the accommodating member 200 is provided with a vent hole 202 for communicating the sliding channel 201 with the outside of the accommodating member 200. The air holes 202 enable the air pressure in the sliding channel 201 to be consistent with the outside, pressure difference is not generated, and the free end 320 of the piston rod 300 can smoothly slide in the sliding channel 201. Meanwhile, since the pump body 100 is used for conveying the sterile product, the sterilizing gas may enter the sliding channel 201 through the vent holes 202 and then enter the accommodating chamber 120, thereby creating a sterile environment for the sterile product in the accommodating chamber 120.

With reference to fig. 2, in the present embodiment, the ventilation hole 202 is located at an end of the accommodating member 200 away from the pump body 100. In the process that the free end 320 of the piston rod 300 reciprocates in the sliding channel 201, the volume of a cavity formed between the free end 320 of the piston rod 300 and one end of the sliding channel 201 far away from the pump body 100 is in the process of changing continuously, the air hole 202 is formed in one end of the accommodating part 200 far away from the pump body 100, the air hole 202 is communicated with the cavity, the cavity can be guaranteed to be communicated with the outside, namely, the cavity cannot generate pressure difference with the outside, and therefore the free end 320 of the piston rod 300 can slide smoothly in the sliding channel 201. Specifically, the air hole 202 may be disposed at any position on the accommodating member 200 as long as the sliding channel 201 is communicated with the outside of the accommodating member 200, so that the free end 320 of the piston rod 300 can slide smoothly in the sliding channel 201.

With reference to fig. 2, in the present embodiment, the vent hole 202 is located at the center of the end of the accommodating member 200, and the vent hole 202 faces the free end 320 of the piston rod 300. The air holes 202 are opposite to the free end 320 of the piston rod 300, namely, the central lines of the air holes 202 are overlapped with the axis of the piston rod 300, the piston rod 300 is in sliding fit with the sliding channel 201, and the central lines of the air holes 202 are overlapped with the central line of the sliding channel 201. The air holes 202 are located at the center of the end of the accommodating part 200, the center of the sliding channel 201 is overlapped with the center of the accommodating part 200, the sliding channel 201 is in a column shape, and the accommodating part 200 is also in a column shape. The air holes 202 are over against the center of the sliding channel 201, and in the reciprocating movement process of the piston rod 300, air in a cavity formed between the free end 320 of the piston rod 300 and one end of the sliding channel 201 far away from the pump body 100 can uniformly flow out of the air holes 202 over against the center of the sliding channel 201, so that the pressure distribution in the cavity is more uniform, and the free end 320 of the piston rod 300 is prevented from moving in the axial direction deviating from the self when being stressed unevenly.

With continued reference to fig. 2, specifically, the air holes 202 are opened on the stopper portions. Specifically, the accommodating part 200 is provided with a sliding channel 201 with one open end, the open end of the sliding channel 201 is used for communicating with the accommodating chamber 120, and one end of the sliding channel 201 away from the open end forms a stop part. The center of the stopping part is provided with a vent hole 202.

Referring again to fig. 2, the receiving member 200 includes a mounting cap 210 and a receiving cylinder 220 coupled to the mounting cap 210, the mounting cap 210 and the receiving cylinder 220 together defining a sliding channel 201, the mounting cap 210 being adapted to be detachably coupled to the pump body 100. The sliding channel 201 extends from the mounting cover 210 into the accommodating barrel 220, and the mounting cover 210 is detachably connected with the pump body 100, so that the disassembly and assembly are convenient.

With continued reference to fig. 2, in this embodiment, the mounting cap 210 and the receiving cylinder 220 are integrally formed. Is convenient for processing. Similarly, the mounting cap 210 and the accommodating barrel 220 may be separately disposed and then connected.

With reference to fig. 2, in the present embodiment, the mounting cap 210 has a first end surface 211 and a second end surface 212 that are disposed opposite to each other, the first end surface 211 is used for being in sealing contact with the pump body 100, the accommodating cylinder 220 is a cylinder, the accommodating cylinder 220 is connected to the second end surface 212 of the mounting cap 210, and an axis of the accommodating cylinder 220 is perpendicular to the second end surface 212.

Referring to the relative position in fig. 2, the first end surface 211 is located on the left side of the mounting cover 210, the second end surface 212 is located on the right side of the mounting cover 210, and the first end surface 211 is in close contact with the outer wall of the pump body 100 to achieve sealing between the mounting cover 210 and the pump body 100; the receiving cylinder 220 is connected to the second end surface 212 and is integrally formed with the mounting cover 210.

With continued reference to fig. 2, specifically, the mounting cap 210 has a cross-section perpendicular to the axial direction of the sleeve that is approximately hexagonal. The overall shape of the mounting cover 210 approximates a hexagonal prism. Six side surfaces are connected between the first end surface 211 and the second end surface 212, and the six side surfaces are sequentially connected along the circumferential direction of the piston rod 300. Six sides are disposed to protrude from the outer wall of the receiving cylinder 220.

With continued reference to fig. 2, in this embodiment, the receptacle 200 further includes a fastener; the mounting cover 210 is provided with a first hole 213, the first hole 213 being adapted to correspond to a second hole provided on the pump body 100, and a fastener is simultaneously engaged with the first hole 213 and the second hole to fix the mounting cover 210 to the pump body 100. In particular, the mounting cap 210 has a rim projecting with respect to the outer wall of the containment drum 220, which is used to enable the connection with the pump body 100. The first hole 213 opens on the rim. The mounting cap 210 may also be fixed to the pump body 100 by welding. In other embodiments, the mounting cap 210 and the pump body 100 can be connected by a snap-fit, or the like.

With continued reference to FIG. 2, specifically, the first hole 213 and the second hole are both threaded holes, and the fasteners are bolts that cooperate with the first hole 213 and the second hole to secure the mounting cap 210 to the pump body 100. The bolt structure is simple, and the mounting cover 210 and the pump body 100 are fast and convenient to disassemble and assemble.

With continued reference to fig. 2, in the present embodiment, the number of the first holes 213, the number of the second holes and the number of the fasteners are all multiple and are in one-to-one correspondence, and the multiple second holes are uniformly distributed around the circumference of the piston rod 300. Correspondingly, the plurality of first holes 213 are evenly distributed around the circumference of the piston rod 300, and the plurality of fasteners are also evenly distributed around the circumference of the piston rod 300. On the one hand, the connection strength of the mounting cap 210 and the pump body 100 is enhanced; on the other hand, the circumferential stress of the mounting cover 210 is uniform, and the strength of the mounting cover 210 is prevented from being influenced by the uneven stress on the mounting cover 210.

With continued reference to fig. 2, specifically, the number of the first holes 213 is four, the number of the second holes is also four, the number of the fasteners is also four, the circumferential spacing between two adjacent first holes 213 is equal, the circumferential spacing between two adjacent second holes is equal, and the circumferential spacing between two adjacent fasteners is equal. The number of first holes 213 may be set according to practical circumstances, and the number of second holes and fasteners may match the number of first holes 213.

According to the accommodating member 200 provided in this embodiment, the operation principle of the accommodating member 200 is as follows: by providing the sliding channel 201 communicated with the accommodating chamber 120, the free end 320 of the piston rod 300 extending out of the accommodating chamber 120 extends, and the accommodating member 200 has dustproof and protective effects on the free end 320 of the piston rod 300, thereby preventing external dust from being brought into the accommodating chamber 120 and personal injury to people during the extension and retraction process.

The accommodating member 200 provided in this embodiment has at least the following advantages:

the receiving member 200 is provided with a sliding channel 201 slidably engaged with the free end 320 of the piston rod 300 to realize smooth movement of the piston rod 300.

The accommodating part 200 is provided with the air holes 202 which are communicated with the sliding channel 201 and the outside, so that the sliding channel 201 is kept the same as the outside pressure, the pressure difference is avoided, the free end 320 of the piston rod 300 can smoothly slide in the sliding channel 201, and the piston rod 300 is prevented from moving and being blocked due to the pressure difference.

The accommodating part 200 is detachably connected with the pump body 100 through the mounting cover 210, and the assembly and disassembly are convenient and quick.

The embodiment of the utility model provides a still provide a force pump, refer to figure 1 again, force pump includes pump head 11. The pressure pump further comprises a drive means 12, a control means, etc.

Referring to fig. 1 again, the embodiment of the present invention further provides a pump head 11, which includes a pump body 100 and a receiving member 200, wherein the receiving member 200 is connected to the pump body 100.

With continued reference to fig. 1, in the present embodiment, the pump body 100 is provided with a receiving chamber 120. The pump head 11 further comprises a piston rod 300 and a piston 400 connected to the piston rod 300, the piston 400 is located in the accommodating chamber 120, and the piston 400 is slidably and hermetically connected with the inner wall of the accommodating chamber 120. The piston 400 is in sliding fit with the inner wall of the accommodating chamber 120, the piston 400 can reciprocate in the accommodating chamber 120, and the outer wall of the piston 400 is sealed with the inner wall of the accommodating chamber 120 without leakage.

With continued reference to fig. 1, in the present embodiment, the piston 400 is located in the middle of the piston rod 300, the two ends of the piston rod 300 respectively form a driving end 310 and a free end 320, the driving end 310 is used for connecting with the driving device 12, and the free end 320 slidably extends into the sliding channel 201.

Both the drive end 310 and the free end 320 of the piston rod 300 extend out of the pump body 100. Referring to the relative positions in fig. 1, the left end of the piston rod 300 is a free end 320, and the right end of the piston rod 300 is a driving end 310. The accommodating part 200 is located outside the pump body 100 and connected to the pump body 100, and the sliding channel 201 provided on the accommodating part 200 is communicated with the accommodating chamber 120, so that the free end 320 of the piston rod 300 extending out of the pump body 100 can extend into the sliding channel 201 from the accommodating chamber 120 and is in sliding fit with the sliding channel 201.

The driving device 12 is located outside the pump body 100, the driving end 310 of the piston rod 300 extends out of the pump body 100 to be connected with the driving device 12, the accommodating chamber 120 extends from left to right, and the driving device 12 drives the piston 400 to reciprocate left and right in the accommodating chamber 120, so that the free end 320 of the piston rod 300 moves left and right in the sliding channel 201. Specifically, the driving device 12 includes a driving motor, a slide rail, a lead screw and a slider, the lead screw is disposed on the slide rail and is drivingly connected to the motor, the slider is slidingly engaged with the slide rail and is threadedly connected to the lead screw, and the driving motor drives the slider to reciprocate along the slide rail during the forward and reverse rotation of the lead screw. The slider is connected with the driving end 310, and drives the piston rod 300 to reciprocate in the process of reciprocating movement of the slider along the slide rail.

With continued reference to fig. 1, in this embodiment, the pump body 100 further includes a first check valve 111, a second check valve 112, a third check valve 113, and a fourth check valve 114; the piston 400 divides the accommodating chamber 120 into a first chamber 121 and a second chamber 122, the pump body 100 is provided with a first liquid inlet 101, a first liquid outlet 102, a second liquid inlet 103 and a second liquid outlet 104, the first check valve 111 is installed on the first liquid inlet 101, the second check valve 112 is installed on the first liquid outlet 102, the third check valve 113 is installed on the second liquid inlet 103, and the fourth check valve 114 is installed on the second liquid outlet 104; the first inlet 101 and the first outlet 102 are both communicated with the first chamber 121, and the second inlet 103 and the second outlet 104 are both communicated with the second chamber 122; the pump head 11 has a first state in which when the piston 400 moves towards the first predetermined direction, the fluid in the first chamber 121 flows out through the first outlet port 102, and the fluid in the second inlet port 103 flows into the second chamber 122; and a second state in which the fluid in the first chamber 121 flows into the first inlet 101 and the fluid in the second chamber 122 flows out through the second outlet 104 when the piston 400 moves in a second predetermined direction opposite to the first predetermined direction.

Referring to the relative position in fig. 1, the first chamber 121 and the second chamber 122 are sequentially arranged from left to right, the piston 400 is hermetically connected with the pump body 100, and the first chamber 121 and the second chamber 122 are not communicated or do not leak. On the pump body 100, a first liquid inlet 101, a first liquid outlet 102, a second liquid inlet 103 and a second liquid outlet 104 are sequentially arranged from left to right. The "first predetermined direction" is a direction indicated by an arrow a in fig. 1, and the "second predetermined direction" is a direction indicated by an arrow B in fig. 1.

When the pump head 11 is in the first state and the piston 400 moves in the first predetermined direction, the first chamber 121 is decreased, and the fluid in the first chamber 121 flows out through the first liquid outlet 102; the second chamber 122 is enlarged and fluid at the second inlet port 103 flows into the second chamber 122. In the second state of the pump head 11, the piston 400 moves in the second predetermined direction, the first chamber 121 increases, and the fluid at the first inlet 101 flows to the first chamber 121; the second chamber 122 is reduced and the fluid in the second chamber 122 flows out through the second outlet port 104. The pump head 11 is in the first state, the first liquid outlet 102 is used for discharging liquid, and in the second state, the second liquid outlet 104 is used for discharging liquid, that is, in the process that the piston 400 moves left and right, continuous liquid discharging can be realized.

With reference to fig. 1, in this embodiment, the pump head 11 further includes a liquid inlet pipe 500 and a liquid outlet pipe 510, one end of the liquid inlet pipe 500 is communicated with the sterile liquid tank 600, and the first liquid inlet 101 and the second liquid inlet 103 are both communicated with the liquid inlet pipe 500. One end of the liquid outlet pipe 510 is connected with the surgical instrument 610, and the first liquid outlet port 102 and the second liquid outlet port 104 are both communicated with the liquid outlet pipe 510.

With continued reference to fig. 1, specifically, the liquid inlet end of the first check valve 111 is communicated with the liquid inlet pipe 500, and the liquid outlet end of the first check valve 111 is communicated with the first chamber 121; the liquid inlet end of the second one-way valve 112 is communicated with the first chamber 121, and the liquid outlet end of the second one-way valve 112 is communicated with the liquid outlet pipe 510; the liquid inlet end of the third one-way valve 113 is communicated with the liquid inlet pipe 500, and the liquid outlet end of the third one-way valve 113 is communicated with the second chamber 122; the inlet end of the fourth check valve 114 is communicated with the second chamber 122, and the outlet end of the fourth check valve 114 is communicated with the outlet pipe 510.

With continued reference to FIG. 1, in this embodiment, effluent pipe 510 is provided with a shut-off valve 530. The shut-off valve 530 is actuated when the drive motor in the drive unit 12 is powered off. When drive mechanism 12 is de-energized, stop valve 530 blocks exit channel 510, preventing a portion of the fluid in exit channel 510 from flowing into surgical instrument 610.

The working process is as follows: referring to the relative position in fig. 1, when the piston 400 moves from left to right (in the second predetermined direction B) in fig. 1, the first chamber 121 forms a negative pressure, the liquid in the liquid inlet pipe 500 enters the first chamber 121 through the first check valve 111, and simultaneously, the second chamber 122 forms a high pressure, and the liquid in the second chamber 122 flows into the liquid outlet pipe 510 through the fourth check valve 114. When the piston 400 moves from the right side to the left side (the first predetermined direction a) in fig. 1, the first chamber 121 is formed with high pressure, the liquid in the second chamber 122 flows into the liquid outlet pipe 510 through the second check valve 112, and simultaneously, the second chamber 122 is formed with negative pressure, and the liquid in the liquid inlet pipe 500 enters the second chamber 122 through the third check valve 113. Therefore, in the reciprocating process, the first chamber 121 and the second chamber 122 alternately supply liquid to the liquid outlet pipe 510, and continuous and stable pumping operation is realized.

In medical devices, especially when sterile liquid is pumped for operation, the flow delivery is not continuous and stable. The prior manual pressurizing pressure pump commonly used clinically has the defects that the pressure is low, the pressure cannot be accurately controlled, the pressure of the discharged liquid is gradually reduced along with the release, the key is that the mucosa is raised and separated and needs to be continuously pressurized for many times, the pressurizing capacity is small each time, a user needs to consume great physical strength, and the speed is slow; the existing automatic pressure pump realizes continuous liquid injection, but a double-cavity double-piston 400 dual-drive structure is adopted, two independent piston rods 300 are actuated in a reciprocating mode to inject liquid alternately, the structural design is complex, two driving mechanisms need to be controlled accurately to be matched with each other to complete the liquid injection, and the whole control process is complex.

The pump head 11 provided by the embodiment adopts a double-chamber single-piston 400 structure, realizes automatic uninterrupted continuous output of high-pressure liquid, and overcomes the technical defects of complex structure and high requirement on control precision of a double-power mechanism in the prior art. In the single-piston 400 dual-chamber continuous infusion pump provided by the embodiment, in the reciprocating process of the piston 400, the first chamber 121 and the second chamber 122 alternately supply liquid to the liquid outlet pipe 510, so that continuous and stable pumping operation is realized. Compared with the prior art, the automatic continuous high-pressure liquid output device can automatically and continuously output high-pressure liquid, and only one piston 400 and one driving device 12 are arranged, so that the installation and the control are convenient, and the structure is simple.

Referring to fig. 3, in the present embodiment, the piston 400 includes a piston body 410 and an elastic sealing member, the piston body 410 is connected to the piston rod 300, the piston body 410 is provided with an annular groove 420, the sealing member is annular, and the sealing member is sleeved in the annular groove 420 and is in sealing connection with the inner wall of the accommodating chamber 120.

The sealing connection between the piston 400 and the inner wall of the receiving chamber 120 is achieved by means of an elastic sealing element. An annular groove 420 extends on piston body 410 in the circumferential direction of piston rod 300, and a sealing member is fitted in annular groove 420.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (16)

1. A receiving member for connection to an exterior of a pump body having a receiving chamber for receiving a piston rod, characterized in that:

the accommodating piece is provided with a sliding channel communicated with the accommodating cavity, and the sliding channel is used for enabling the free end of the piston rod extending out of the pump body to extend into the accommodating piece.

2. The pod of claim 1, wherein:

one end of the accommodating piece, which is far away from the pump body, is provided with a stop part which extends towards the center of the sliding channel relative to the inner wall of the sliding channel so as to stop the free end of the piston rod.

3. The pod of claim 1, wherein:

the accommodating piece is provided with air holes for communicating the sliding channel with the outside of the accommodating piece.

4. The pod of claim 3, wherein:

the air holes are located at one end, far away from the pump body, of the accommodating piece.

5. The pod of claim 4, wherein:

the air hole is positioned in the center of the end part of the accommodating part and is opposite to the free end of the piston rod.

6. The pod of any of claims 1-5, wherein:

the accommodating piece comprises an installation cover and an accommodating barrel connected with the installation cover, the installation cover and the accommodating barrel jointly define the sliding channel, and the installation cover is detachably connected with the pump body.

7. The pod of claim 6, wherein:

the mounting cover and the accommodating barrel are integrally formed.

8. The pod of claim 6, wherein:

the container further comprises a fastener;

the mounting cover is provided with a first hole, the first hole is used for corresponding to a second hole arranged on the pump body, and the fastener is matched with the first hole and the second hole simultaneously so as to fix the mounting cover to the pump body.

9. The pod of claim 8, wherein:

the first holes, the second holes and the fasteners are all in a plurality of one-to-one correspondence, and the second holes are uniformly distributed around the circumferential direction of the piston rod.

10. The pod of claim 6, wherein:

the mounting cover is provided with a first end face and a second end face which are arranged oppositely, the first end face is used for being in sealing contact with the pump body, the accommodating barrel is a cylinder and is connected with the second end face of the mounting cover, and the axis of the accommodating barrel is perpendicular to the second end face.

11. A pump head, comprising:

the pump head comprising a pump body and a housing according to any of claims 1 to 10, the housing being connected to the pump body.

12. A pumphead as claimed in claim 11, wherein:

the pump head still includes the piston rod and connect in the piston of piston rod, the piston is located in the holding chamber, the piston slidable with holding chamber's inner wall sealing connection.

13. A pumphead as claimed in claim 12, wherein:

the piston is located in the middle of the piston rod, a driving end and a free end are formed at two ends of the piston rod respectively, the driving end is used for being connected with a driving device, and the free end can extend into the sliding channel in a sliding mode.

14. A pumphead as claimed in claim 13, wherein:

the piston comprises a piston body and an elastic sealing element, the piston body is connected with the piston rod, the piston body is provided with an annular groove, the sealing element is annular, and the annular groove is sleeved with the sealing element and is in sealing connection with the inner wall of the accommodating chamber.

15. A pumphead as claimed in claim 12, wherein:

the pump body further comprises a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve;

the piston divides the accommodating cavity into a first cavity and a second cavity, the pump body is provided with a first liquid inlet, a first liquid outlet, a second liquid inlet and a second liquid outlet, the first one-way valve is installed at the first liquid inlet, the second one-way valve is installed at the first liquid outlet, the third one-way valve is installed at the second liquid inlet, and the fourth one-way valve is installed at the second liquid outlet;

the first liquid inlet and the first liquid outlet are both communicated with the first cavity, and the second liquid inlet and the second liquid outlet are both communicated with the second cavity;

when the piston of the pump head moves towards a first preset direction, the fluid in the first chamber flows out through the first liquid outlet, and the fluid at the second liquid inlet flows into the second chamber; and when the piston orientation with the direction removal is predetermine to first second that predetermines the opposite direction, the fluid of first inlet port department flows into in the first cavity, fluid in the second cavity passes through the second state that the second liquid outlet flows.

16. A pressure pump, characterized by:

a pressure pump comprising a pump head as claimed in any one of claims 11 to 15.

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