CN112657052A - Peristaltic pump and portable dialysis apparatus having the same - Google Patents

Abstract

The invention relates to the technical field of electromotion, and provides a peristaltic pump and portable dialysis equipment with the same. The peristaltic pump comprises a motor, a shaft connected to the motor for outputting a motor torque, a pump head, a rotor housed in a pump chamber of the pump head, and a tube portion arranged adjacent to the rotor, the rotor being rotatably supported by the shaft in the pump chamber, the rotor being detachably locked to the shaft by a locking means, the locking means comprising a resilient member for axially locking the rotor relative to the shaft and a catch for circumferentially locking the rotor relative to the shaft, the catch being pivotably arranged on the rotor, in a locking position in which a part of the resilient member is clamped to the shaft and another part is stopped at the rotor, the catch engaging with the resilient member to retain the resilient member in the locking position when the catch is in anti-rotational engagement with the shaft.

Description

Peristaltic pump and portable dialysis apparatus having the same

Technical Field

The invention relates to the technical field of electromotion, in particular to a peristaltic pump and portable dialysis equipment with the same.

Background

Portable dialysis devices are commonly used for extracorporeal hemodialysis treatments, typically comprising peristaltic pumps, dialyzers, etc. Peristaltic pumps typically include a motor, a pump head, a rotor, and a hose, among other things. In the medical technology field, peristaltic pumps require replacement of the hose with a new one after each treatment. Furthermore, for cleaning purposes, the rotor needs to be removed for cleaning after each dialysis session and then installed in the pump head. In the prior art, the rotor is typically locked in the pump head using the latch hooks of the coupling. After the rotor is assembled with the pump head, the rotor is locked to the rotating shaft of the motor, and the rotor is difficult to manually rotate for adjustment due to the resistance of the motor.

Disclosure of Invention

In view of the above, the present invention aims to provide a peristaltic pump, and a portable dialysis device having the same, which may solve or at least reduce the above-mentioned problems.

Therefore, the invention provides a peristaltic pump, which comprises a motor, a rotating shaft connected with the motor and used for outputting motor torque, a pump head and a rotor accommodated in a pump cavity of the pump head, and a tube portion arranged adjacent to the rotor, the rotor being rotatably supported in the pump chamber by the rotary shaft, the rotor is detachably locked on the rotating shaft through a locking device, the locking device comprises an elastic piece used for axially locking the rotor relative to the rotating shaft and a buckle piece used for circumferentially locking the rotor relative to the rotating shaft, the buckle piece is pivotally arranged on the rotor, in the locking position, one part of the elastic piece is clamped on the rotating shaft and the other part is stopped at the rotor, when the catch is engaged with the shaft in an anti-rotation manner, the catch engages with the elastic member to hold the elastic member at the lock position.

In some embodiments, a positioning groove is formed at one end of the rotating shaft, which is connected with the rotor, and the positioning groove is used for being connected with the fastener.

In some embodiments, the rotating shaft is provided with an annular clamping groove in the circumferential direction adjacent to the positioning groove, the elastic member includes two elastic arms, and the rotating shaft is clamped between the two elastic arms and enables the two elastic arms to be clamped in the clamping groove.

In some embodiments, each of the two elastic arms is substantially L-shaped, and includes a connecting section and a clamping section substantially perpendicular to the connecting section, and the clamping section is clamped in the clamping groove of the rotating shaft.

In some embodiments, the elastic member further includes a fixing portion connected between the connecting sections of the two elastic arms.

In some embodiments, the fixing portion is substantially U-shaped, and the fixing portion engages with the locking member to prevent the elastic member from being displaced.

In some embodiments, the fastener is substantially L-shaped, and includes a handle and a positioning rod connected substantially perpendicular to the handle, and an end of the positioning rod adjacent to the handle has a neck portion that can be correspondingly fastened in the fixing portion of the elastic member.

In some embodiments, the rotor includes a base and an upper cover connected to the base, one side of the upper cover is provided with an insertion opening through which the elastic arm of the elastic member passes, and the base is provided with a first boss at an inner side adjacent to the insertion opening, and the elastic arms are respectively disposed at both sides of the first boss.

In some embodiments, a second boss is respectively disposed on two sides of the first boss and located outside the elastic arm, the elastic member further includes a flaring portion extending outwards from the end of the elastic arm, and the flaring portion is stopped by the second boss when the elastic member is located at the release position.

The invention also provides portable dialysis equipment comprising the peristaltic pump.

The locking device provided by the embodiment of the invention is convenient for the rotor to be manually adjusted in the pump head, has simple structure and low cost, is convenient to operate, assemble and disassemble, and has longer service life.

Drawings

Fig. 1 shows a schematic structural diagram of a portable dialysis apparatus according to an embodiment of the present invention.

Figure 2a shows a perspective view of a peristaltic pump comprising a rotor.

Figure 2b shows a partially exploded view of the peristaltic pump shown in figure 2 a.

Fig. 3 shows a perspective view of the rotor of the peristaltic pump shown in fig. 2 a.

Fig. 4 shows a partially exploded view of the rotor of the peristaltic pump shown in fig. 2a, wherein the shaft is also shown.

Fig. 5 shows a perspective view of the locking device and the shaft when the rotor shown in fig. 3 is locked in the peristaltic pump.

Fig. 6a shows a perspective view of the elastic member of the locking device of the rotor shown in fig. 3.

Fig. 6b shows a top view of the spring shown in fig. 6 a.

Fig. 6c shows a left side view of the elastic member shown in fig. 6 a.

Fig. 7a shows a perspective view of the catch of the locking device of the rotor shown in fig. 3.

Fig. 7b shows a front view of the clasp shown in fig. 7 a.

Fig. 8a shows a perspective view of the upper cover of the rotor shown in fig. 3.

Fig. 8b shows another perspective view of the upper cover of the rotor shown in fig. 3.

Fig. 9 shows a perspective view of the elastic member and the upper cover of the rotor in the locked position.

Fig. 10 shows a perspective view of the spring, the catch and the spindle at the upper cover in the locked position.

Fig. 11 shows a perspective view of the elastic member on the base of the rotor.

Fig. 12 shows a schematic view of the process of rotor installation and locking shown in fig. 3.

Reference numerals: 300-a portable dialysis device; 301-a dialyzer; 302-arterial pressure monitor; 303-the arteria pot; 304-venous pot; 305-an air detector; 306-venous pressure monitor; 200-peristaltic pump; 201-pump head; 202-a tube portion; 203-pump chamber; 204-a rotor; 241-upper cover; 411-a notch; 412-a receiving tank; 413-an insertion port; 414-an opening; 441-an accommodating space; 415-a step; 416-a fixation hole; 461-through hole; 462-a limiting part; 417-stop face; 418-connecting piece; 419-grooves; 242-a base; 221-a first boss; 222-a second boss; 223-convex columns; 243-rotating roller; 205-a rotating shaft; 251-a card slot; 252-a positioning groove; 206-a motor; 1-a locking device; 11-an elastic member; 110-a resilient arm; 101-a connecting segment; 102-a clamping section; 111-flaring portion; 112-a fixed part; 12-a fastener; 120-a handle; 121-a positioning rod; 122-connecting hole; 123-neck; 124-inclined plane; 125-head.

Detailed Description

The invention will be described in detail with reference to the accompanying drawings and specific embodiments, so that the technical scheme and the beneficial effects of the invention are more clear. It is to be understood that the drawings are provided for purposes of illustration and description only and are not intended as a definition of the limits of the invention, but are drawn to scale.

Fig. 1 shows a schematic structural diagram of the main basic components of a portable dialysis device 300 according to an embodiment of the present invention. The portable dialysis device 300 comprises a peristaltic pump 200 and a dialyzer 301. Peristaltic pump 200 is typically a peristaltic pump or a tube roller pump. The peristaltic pump 200 pumps the arterial blood of the user, monitors, dialyzes, and delivers the arterial blood via the other paths of the portable dialysis device 300, and the blood dialyzed via the portable dialysis device 300 is delivered back to the patient as venous blood. Other devices, such as an arterial pressure monitor 302, an arterial pot 303, a venous pot 304, an air detector 305, a venous pressure monitor 306, etc., are also disposed on the transportation and dialysis paths of the portable dialysis apparatus 300, and the configuration thereof is the same as that of the prior art, and will not be described herein.

Referring to fig. 2a and 2b together, the peristaltic pump 200 includes a motor (206), a rotating shaft (205) connected to the motor (206) for outputting a torque of the motor (206), a pump head 201 installed at one side of the motor, a rotor 204 accommodated in a pump chamber 203 surrounded by the pump head 201, and a tube portion 202 bypassing the rotor 204. The rotational shaft 205 of the motor is connected to the rotor 204 through the bottom side of the pump head 201, said rotor 204 being rotatably supported by the rotational shaft 205. In this embodiment, the shaft 205 may be a separate shaft member drivingly connected to the motor. The tube portion 202 is a flexible tube. The tubing section 202 is disposed between the rotor 204 and the pump head 201, and blood entering the tubing section 202 is peristaltically transported by the rotating rotor 204.

Referring to fig. 3 and 4 together, the rotor 204 includes a base 242, an upper cover 241 fixedly coupled to the base 242, and a rotary roller 243 disposed between the base 242 and the upper cover 241. In the present embodiment, in a transverse cross section of the rotor 204 perpendicular to the axial direction, the dimension in one direction is larger than the dimension in the other direction, and the rotating rollers 243 are two rotating rollers arranged oppositely. The rotating roller 243 is arranged at a horizontally long dimension of the rotor 204. The tube 202 is pressed by the rollers 243 of the rotor 204 to effect peristaltic delivery of blood.

Referring to fig. 3 to 5, the rotor 204 is locked on the rotating shaft 205 by the locking device 1, so that the rotor 204 rotates synchronously with the rotating shaft 205. In this embodiment, the locking device 1 is disposed on the upper cover 241 of the rotor 204 and cooperates with the rotating shaft 205. Preferably, the locking device 1 is arranged between two rotating rollers 243 of the rotor 204. It is also preferred that the locking device 1 is arranged at the smallest dimension in the transverse direction of the rotor 204. The locking device 1 comprises an elastic member 11 and a catch member 12. The elastic member 11 serves to axially lock the rotor 204 with respect to the rotating shaft 205. The catch 12 circumferentially locks the rotor 204 relative to the shaft 205 and keeps the resilient member 11 in its locked position, preventing the resilient member 11 from being displaced to the release position (i.e. the resilient member 11 is disengaged from the shaft 205), thereby enabling the rotor 204 to rotate with the shaft 205.

The axial end surface of the rotating shaft 205 engaged with the rotor 204 is opened with a positioning groove 252 for positioning and receiving the fastener 12, so as to achieve circumferential locking of the rotor 204 relative to the rotating shaft 205. The rotating shaft 205 is provided with an annular locking groove 251 along the circumferential direction below the positioning groove 252 for receiving the elastic element 11. The elastic member 11, the latch 12 and the rotating shaft 205 are mutually matched to realize the axial and circumferential locking of the rotor 204 relative to the rotating shaft 205.

As shown in fig. 6a to 6c, the elastic member 11 includes a substantially U-shaped fixing portion 112, two substantially L-shaped elastic arms 110 respectively extending from two ends of the fixing portion 112, and an outwardly expanding portion 111 extending from the end of each elastic arm 110. Wherein, the fixing portion 112 is substantially U-shaped with a narrowed opening. Each elastic arm 110 includes a connecting segment 101 connected to the fixing portion 112 and a clamping segment 102 substantially perpendicular to the connecting segment 101, wherein the connecting segment 101 and the fixing portion 112 extend from the top end of the fixing portion 112 toward the bottom end in the same plane, and the clamping segment 102 extends from the end of the connecting segment 101 along a plane substantially perpendicular to the fixing portion 112. In this embodiment, the two clamping sections 102 are symmetrically disposed relative to the fixing portion 112, and the clamping sections 102 of the two elastic arms 110 extend side by side and in the same direction. The distance between the two clamping sections 102 decreases in a direction away from the connecting section 101. The flaring portions 111 extend at an angle flaring at the ends of the clamping segments 102 of the elastic arms 110, that is, the flaring portions 111 and the corresponding clamping segments 102 are arranged in a truncated V shape, and the distance between the flaring portions 111 gradually increases in the direction away from the ends of the clamping segments 102. Preferably, the elastic member 11 is a wire spring. Referring to fig. 3 to 5, when the rotor 204 is locked on the rotating shaft 205, i.e. in the locked position, the clamping sections 102 of the two elastic arms 110 of the elastic member 11 are clamped in the clamping grooves 251 of the rotating shaft 205, so as to be clamped on both sides of the rotating shaft 205, and the fixing portion 112 engages with the fastener 12.

Referring to fig. 7a and 7b together, clasp 12 is provided with a handle 120 and a detent lever 121 coupled to handle 120. In this embodiment, the latch 12 is generally L-shaped, and the handle 120 is connected to the positioning rod 121 generally perpendicularly. In this embodiment, the handle 120 is connected to a head 125 of a positioning rod 121, one end of the positioning rod 121 adjacent to the head 125 being arranged as a neck 123, which is slightly smaller in size in the transverse direction than the head 125. The neck 123 is slightly smaller in its vertical dimension than the rest of the positioning rod 121, and preferably transitions through upper and lower slopes 124. In the locked state, the neck portion 123 of the positioning rod 121 is engaged with the fixing portion 112 of the elastic member 11, so that the fixing portion 112 of the elastic member 11 is clamped between both sides of the neck portion 123 of the positioning rod 121. The provision of the neck 123 and the inclined surface 124 of small size facilitates the engagement of the fixing portion 112 of the elastic member 11 to the grommet 12, and the provision of the neck 123 and the inclined surface 124 enables the grommet 12 to securely position the elastic member 11 even in the presence of a slight deviation. The end of the positioning rod 121 far away from the handle 120 is provided with a connecting hole 122 for pivotally connecting the buckle 12 to the upper cover 241.

Referring to fig. 4, 8a and 8b together, the latch 12 is connected to the upper cover 241 through the connection hole 122 using a connection member 418. The latch 12 is pivotable with respect to the upper cover 241.

The outer side of the upper cover 241 is provided with a notch 411 for receiving the handle 120 of the grommet 12, and a receiving groove 412 for receiving the positioning rod 121. The notches 411 are arranged vertically, and the receiving grooves 412 extend transversely. The recess 411 and the receiving slot 412 are in an L-shaped arrangement that substantially completely receives the handle 120 and the clasp 12. The connection between the top of the recess 411 and the receiving slot 412 has a groove 419 with a larger size, so that a step 415 is formed at the outer edge of the top of the recess 411 adjacent to the side of the receiving slot 412. The step 415 is provided with an insertion opening 413 for the elastic element 11 to pass through, and the insertion opening 413 and the receiving groove 412 are arranged at intervals. The groove 419 is provided with a vertical stop surface 417 at a side adjacent to the receiving groove 412 for stopping the elastic member 11, thereby limiting a moving distance of the elastic member 11 toward the rotating shaft 205.

Further, referring to fig. 9 to 11 together, in order to define the moving path of the elastic member 11 inside the base 242 of the rotor 204, a first boss 221 is provided on the base 242 at an inner side adjacent to the insertion port 413. The two elastic arms 110 of the insert 11 are respectively disposed at both sides of the first boss 221 to secure the moving direction of the insert 11. Preferably, a second boss 222 is further disposed on each of two sides of the first boss 221, and the two second bosses 222 are located outside the two elastic arms 110.

The receiving groove 412 has a certain depth in the axial direction, and the bottom of the upper cover 241 is recessed at the center of the receiving groove 412 to form a receiving space 441 for receiving the top end of the rotating shaft 205, so that the top end of the rotating shaft 205 extends into the receiving groove 412 and the positioning groove 252 of the rotating shaft 205 is aligned with the receiving groove 412. The bottom of the upper cover 241 is provided with an opening 414 communicating with the receiving space 441, and preferably, the shape of the opening 414 matches with the shape of the positioning groove 252, so that the positioning groove 252 of the rotating shaft 205 coincides with the receiving groove 412. In the present embodiment, the positioning groove 252 is a slot perpendicular to the axial direction of the rotating shaft 205. Fixing holes 416 are disposed on both side walls of the housing groove 412 away from the insertion port 413, the fixing holes 416 are aligned with the connection holes 122 of the grommet 12, and a connecting member 418 passes through the fixing holes 416 and the connection holes 122 to pivotably fix the grommet 12 in the upper cover 241. Preferably, the connection 418 is a pin.

In order to facilitate the installation of the fastener 12, the fixing holes 416 may be U-shaped holes, and a through hole 461 is disposed at the bottom of the receiving groove 412 corresponding to a portion between the two fixing holes 416, so as to facilitate the vertical arrangement of the fastener 12 and the through hole 461 passing through the bottom of the receiving groove 412, after the connecting member 418 is inserted into the connecting hole 122 of the fastener 12, the fastener 12 is pulled up until the connecting member 418 is received in the U-shaped fixing hole 416, so as to connect the connecting member 418 and the connecting hole 122 conveniently, thereby eliminating a step of sequentially passing the connecting member 418 through the two fixing holes 416, and facilitating the installation. In addition, in the present embodiment, a limiting portion 462 is further provided at the end of the fixing hole 416 facing away from the through hole 461, for preventing the connecting member 418 from being removed from the fixing hole 416. Preferably, in order to further enhance the limiting effect on the connecting element 418, as shown in fig. 11, the base 242 of the rotor 204 is provided with two protruding columns 223 corresponding to the two U-shaped fixing holes 416, and after the upper cover 241 is assembled with the base 242, the two protruding columns 223 abut against the bottom ends of the U-shaped fixing holes 416, so as to prevent the connecting element 418 from being separated from the U-shaped fixing holes 416.

Fig. 12 schematically shows a process of assembling the rotor 204 to the rotating shaft 205. Referring to fig. 5, fig. 6a and fig. 10, the rotor 204 is sleeved on the rotating shaft 205, the clamping section 102 of the elastic arm 110 of the elastic element 11 is pushed into the clamping groove 251 of the rotating shaft 205, and the rotor 204 is axially locked with respect to the rotating shaft 205. The rotation of the rotor 204 relative to the rotation shaft 205 is not limited only after the elastic member 11 is pushed in, and therefore, the user can adjust the position of the rotor 204 so as to arrange the pipe portion 202 (shown in fig. 2) and the position between the pipe portion and the rotor 204. During this time, since the rotor 204 is able to rotate relative to the rotating shaft 205, the rotation of the rotor 204 is not affected by the resistance of the rotating shaft 205. After the position of the rotor 204 is adjusted, the latch 12 is rotated, and the latch 12 is engaged in the positioning groove 252 of the rotating shaft 205 and the fixing portion 112 of the elastic member 11, so that the rotor 204 is circumferentially locked with respect to the rotating shaft 205, and the elastic member 11 is reliably held at the locking position.

Referring to fig. 10 and fig. 11, when it is needed to release the rotor 204, the locking member 12 is rotated upward, so that the locking member 12 is disengaged from the rotating shaft 205 and separated from the fixing portion 112 of the elastic member 11, and then the elastic member 11 is pulled out in the horizontal direction, thereby releasing the engagement between the elastic arm 110 of the elastic member 11 and the locking groove 251 at the top end of the rotating shaft 205, and the end portions of the two second bosses 222 abut against the flaring portion 111, preventing the elastic member 11 from being completely pulled out and disengaged from the rotor 204.

According to the peristaltic pump 200 provided by the invention, the rotor 204 can be conveniently and easily adjusted in the process of being locked to the pump head through the mutual matching of the locking device 1 and the rotating shaft 205, the rotor 204 is reliably locked on the rotating shaft 205, and the locking device 1 is simple in structure, low in cost and convenient to operate, assemble and disassemble.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-listed embodiments, and any simple changes or equivalent substitutions of technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the protection scope of the present invention.

Claims (10)

1. A peristaltic pump comprising an electric motor (206), a rotational shaft (205) connected to the electric motor (206) for outputting a motor torque, a pump head (201), a rotor (204) accommodated in a pump chamber (203) of the pump head (201), and a tube portion (202) arranged adjacent to the rotor (204), the rotor (204) being rotatably supported in the pump chamber (203) by the rotational shaft (205), characterized in that the rotor (204) is detachably locked to the rotational shaft (205) by a locking device (1), the locking device (1) comprising a resilient member (11) for axially locking the rotor (204) with respect to the rotational shaft (205) and a catch member (12) for circumferentially locking the rotor (204) with respect to the rotational shaft (205), the catch member (12) being pivotably arranged on the rotor (204), in a locking position, one part of the spring (11) is clamped on the rotating shaft (205) and the other part is stopped at the rotor (204), when the latch (12) is rotationally engaged with the rotating shaft (205), the latch (12) is engaged with the spring (11) to keep the spring (11) in the locking position.

2. Peristaltic pump according to claim 1, characterized in that the end of the rotating shaft (205) engaging the rotor (204) is provided with a positioning slot (252), said positioning slot (252) being intended to engage the catch (12).

3. Peristaltic pump according to claim 2, characterized in that said rotating shaft (205) is provided with a circumferential notch (251) adjacent to said positioning slot (252), said elastic element (11) comprises two elastic arms (110), said rotating shaft (205) is clamped between said two elastic arms (110) and makes said two elastic arms (110) be clamped in said notch (251).

4. Peristaltic pump according to claim 3, characterized in that each of said two elastic arms (110) is substantially L-shaped and comprises a connecting section (101) and a clamping section (102) substantially perpendicular to said connecting section (101), said clamping section (102) being lodged in said housing (251) of said rotating shaft (205).

5. Peristaltic pump according to claim 3, characterized in that said elastic element (11) further comprises a fixed portion (112), said fixed portion (112) being connected between the connecting sections (101) of said two elastic arms.

6. Peristaltic pump according to claim 5, characterized in that said fixed portion (112) is substantially U-shaped, said fixed portion (112) engaging said catch (12) to prevent displacement of said elastic element (11).

7. Peristaltic pump according to claim 6, characterized in that said snap-in element (12) is substantially L-shaped and comprises a handle (120) and a positioning rod (121) connected substantially perpendicularly to said handle (120), said positioning rod (121) having, at an end adjacent to said handle (120), a neck (123), said neck (123) being adapted to snap into said fixed portion (112) of said elastic element (11).

8. Peristaltic pump according to claim 3, characterized in that said rotor (204) comprises a base (242) and an upper cover (241) connected to said base (242), said upper cover (241) being provided on one side with an insertion opening (413) for the passage of said elastic arms (110) of said elastic element (11), said base (242) being provided, adjacent to the inner side of said insertion opening (413), with a first boss (221), said elastic arms (110) being arranged on either side of said first boss (221).

9. Peristaltic pump according to claim 8, characterized in that on either side of said first projection (221) there is further provided a second projection (222) located outside said elastic arm (110), said elastic member (11) further comprising a flared portion (111) extending outwardly from the tip of said elastic arm (110), said flared portion (111) being stopped by said second projection (222) when said elastic member (11) is in the release position.

10. A portable dialysis device comprising a peristaltic pump as claimed in any one of claims 1 to 9.

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