CN211486026U - Injection pump - Google Patents

Abstract

The embodiment of the application provides an injection pump, including casing, push-and-pull box subassembly, pump body device, mainboard and cable. The pump body device includes: the device comprises a base body, a sliding assembly, a hollow shaft, a screw rod and a driving mechanism; the sliding assembly comprises a first sliding piece and a second sliding piece; the hollow shaft is connected with the second sliding piece and the push-pull box component; the hollow shaft is provided with an installation channel extending along the axial direction, and the screw rod is arranged in the installation channel in a penetrating mode and is in transmission connection with the second sliding piece; the driving mechanism is in driving connection with the screw rod so that the screw rod converts the rotation motion of the screw rod into the linear motion of the second sliding part, and the second sliding part drives the push-pull box assembly connected with the hollow shaft to reciprocate relative to the base body; the main board is arranged in the inner cavity of the shell; the cable at least penetrates through one part of the mounting channel along the axial direction of the hollow shaft so as to connect the main board and the push-pull box assembly; the hollow shaft separates the cable from the lead screw. The injection pump of this application embodiment is when avoiding the lead screw damage cable, and the structure is compacter.

Description

Injection pump

Technical Field

The application relates to the technical field of medical equipment, in particular to an injection pump.

Background

The injection pump is a device for pushing a piston of an injector to inject and transfuse liquid so as to realize high-precision, stable and pulsation-free liquid transmission. The injection pump is generally provided with a screw rod and a sliding assembly, and the screw rod can convert the rotation motion of the screw rod into the linear motion of the sliding assembly under the driving of a driving mechanism, so that the sliding assembly can drive a push-pull box assembly connected with the sliding assembly to perform reciprocating motion. In addition, corresponding electric signals need to be transmitted between the push-pull box assembly and the main board of the injection pump, and therefore the push-pull box assembly and the main board of the injection pump need to be connected through cables.

In the correlation technique, in order to avoid the lead screw can cause the damage to the cable at rotatory in-process, lead screw and cable need separately to be arranged, however, relevant setting mode all needs to occupy more installation space in the syringe pump to be unfavorable for the miniaturization of syringe pump.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide an injection pump with a more compact structure while avoiding damage to the cable by the screw rod.

To achieve the above object, an aspect of the embodiments of the present application provides a syringe pump including:

a housing having an interior cavity;

the push-pull box assembly is arranged outside the shell;

a pump body device disposed in the inner cavity; the pump body device includes: the device comprises a base body, a sliding assembly, a hollow shaft, a screw rod and a driving mechanism; the sliding assembly comprises a first sliding part arranged on the base body and a second sliding part connected with the first sliding part in a sliding manner; one end of the hollow shaft is connected with the second sliding piece, and one end of the hollow shaft, which is far away from the second sliding piece, is connected with the push-pull box assembly; the hollow shaft is provided with an installation channel extending along the axial direction, and the screw rod is arranged in the installation channel in a penetrating mode and is in transmission connection with the second sliding piece; the driving mechanism is in driving connection with the screw rod; the screw rod converts the rotation motion of the screw rod into the linear motion of the second sliding part through the driving of the driving mechanism, so that the second sliding part drives the push-pull box assembly connected with the hollow shaft to reciprocate relative to the base;

a main board disposed in the inner cavity;

the cable penetrates through at least one part of the installation channel along the axial direction of the hollow shaft so as to connect the main board and the push-pull box assembly; the hollow shaft separates the cable from the lead screw.

Another aspect of the embodiments of the present application also provides a syringe pump including:

a housing having an interior cavity;

the push-pull box assembly is arranged outside the shell;

a pump body device disposed in the inner cavity; the pump body device includes: the device comprises a base body, a sliding assembly, a hollow shaft, a screw rod and a driving mechanism; the seat body is arranged on the bottom wall of the shell at the inner cavity; the sliding assembly comprises two guide rods arranged on the seat body in parallel at intervals and a sliding block arranged on the two guide rods in a penetrating mode; the hollow shaft is arranged between the two guide rods, one end of the hollow shaft is connected with the sliding block, and the end of the hollow shaft, far away from the sliding block, is connected with the push-pull box assembly; the hollow shaft comprises a shaft body and a sleeve sleeved in the shaft body, the shaft body is provided with an installation channel extending along the axial direction, the sleeve divides the installation channel into a first sub-channel and a second sub-channel, and a first threading opening communicated with the second sub-channel is formed in the side wall of one end, close to the sliding block, of the shaft body; the screw rod penetrates through the first sub-channel and is in transmission connection with the sliding block; the driving mechanism is in driving connection with the screw rod; the screw rod converts the rotation motion of the screw rod into the linear motion of the slide block by the driving of the driving mechanism, so that the slide block drives the push-pull box assembly connected with the hollow shaft to reciprocate relative to the base body;

the main board is arranged in the inner cavity and is positioned on one side of the seat body; the main board is connected with the bottom wall of the shell at the inner cavity, and is close to one end, far away from the push-pull box assembly, of the hollow shaft;

the cable penetrates through the second sub-channel, one end, close to the push-pull box assembly, of the cable is connected with the push-pull box assembly, and one end, far away from the push-pull box assembly, of the cable extends out of the shaft body from the first threading opening and is connected with the main board.

The injection pump of this application embodiment, through cup jointing lead screw and hollow shaft, simultaneously, along the axial of hollow shaft, the cable passes the partly of installation passageway at least to utilize the structure of hollow shaft self to separate lead screw and cable, from this, both can avoid the lead screw to damage the cable at rotatory in-process, can make the structure of injection pump again can be compacter.

Drawings

Fig. 1 is a schematic view of a matching structure of a syringe pump and a syringe according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the internal structure of the syringe pump shown in FIG. 1;

FIG. 3 is a schematic partial structural view of the syringe pump of FIG. 2 showing primarily the push-pull cassette assembly, the pump body arrangement and the cable;

FIG. 4 is a schematic view from another perspective of the partial structure of the syringe pump shown in FIG. 3;

FIG. 5 is a schematic view of the pump body assembly shown in FIG. 2;

FIG. 6 is a schematic view of the engagement of a portion of the pump body assembly shown in FIG. 5 with a cable;

FIG. 7 is a sectional view showing a partial structure of the pump body device shown in FIG. 6;

FIG. 8 is a schematic cross-sectional view of the cable and lead screw of FIG. 5 disposed through a hollow shaft;

FIG. 9 is a schematic view of the mating arrangement of the jaws of the push-pull cassette assembly shown in FIG. 4 with associated structure within the cassette body;

FIG. 10 is a schematic cross-sectional view of a cable and lead screw disposed through a hollow shaft according to a second embodiment of the present application;

FIG. 11 is a schematic cross-sectional view of a cable and lead screw installed in a hollow shaft according to a third embodiment of the present application;

FIG. 12 is a cross-sectional view of the cable and lead screw of FIG. 11 shown from another perspective being threaded into a hollow shaft;

fig. 13 is a schematic view of a matching structure of a hollow shaft, a cable and a screw rod according to a fourth embodiment of the present application.

Description of the reference numerals

A syringe pump 100; a pump body device 10; a slide assembly 11; a first slider 111, a guide bar 111'; a second slider 112, a slider 112'; an oil-containing liner 113; a first mounting hole 112' a; a second mounting hole 112' b; third mounting holes 112' c; a quill 12, 12 '″, 12'; mounting channels 12a, 12' ″ a; a first sub-channel 12 b; a second sub-channel 12 c; a first threading port 12 d; a third sub-channel 12' e; a fourth sub-channel 12' f; a shaft body 121; a wire guard assembly 122, a sleeve 122 ', a baffle 122 ', a resilient catch 122 '; a card slot 122'; a first sub-sleeve 1221'; a second sub-sleeve 1222'; a second threading opening 12 '″'; a screw rod 13; a nut 14; a base body 15; a drive mechanism 16; a pulley mechanism 17; a timing belt 171; a primary gear 172; a secondary gear 173; a bearing 18; a gasket 19; a housing 20; an inner cavity 20 a; a push-pull box assembly 30; a case 31; a push-pull box motor 32; an output gear 33; a linkage gear 34; the first sub gear 341; the second sub gear 342; a jaw 35; a first clamp arm 351; a second clamp arm 352; the pressure detecting element 36; a cable 40; a main board 50; a syringe 200.

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

The present application provides a syringe pump 100, this syringe pump 100 is used for cooperating with the syringe 200 that holds the liquid medicine to realize high accuracy, steady pulsation-free liquid transmission.

Referring to fig. 1 to 5, 7 and 8, the syringe pump 100 of the present embodiment includes: the pump body device 10 includes a housing 20, a main plate 50, and a cable 40. The housing 20 has an inner cavity 20 a. The push-pull box assembly 30 is disposed outside the housing 20. The pump body device 10 is disposed in the inner cavity 20 a. The pump body device 10 includes: seat body 15, sliding assembly 11, hollow shaft 12, lead screw 13 and actuating mechanism 16. The sliding assembly 11 includes a first sliding member 111 disposed on the base 15, and a second sliding member 112 slidably connected to the first sliding member 111. One end of the hollow shaft 12 is connected to the second slider 112, and the end of the hollow shaft 12 remote from the second slider 112 is connected to the push-pull box assembly 30. The hollow shaft 12 has an axially extending mounting channel 12a, and the screw 13 is inserted into the mounting channel 12a and is in transmission connection with the second slider 112. The drive mechanism 16 is in driving connection with the screw 13. Through the driving of the driving mechanism 16, the screw 13 converts the rotation motion thereof into the linear motion of the second sliding member 112, so that the second sliding member 112 drives the push-pull box assembly 30 connected with the hollow shaft 12 to reciprocate relative to the seat body 15. The main plate 50 is disposed in the internal cavity 20 a. In the axial direction of the hollow shaft 12, the cable 40 passes through at least a part of the mounting passage 12a, and the hollow shaft 12 separates the cable 40 from the lead screw 13.

Specifically, the cable 40 is mainly used for transmitting corresponding signals between the push-pull box assembly 30 and the main board 50, for example, referring to fig. 9, the push-pull box assembly 30 of the present embodiment includes: a case 31, and a pressure detecting element 36 provided in the case 31. The pressure detection element 36 is electrically connected to the main board 50 through a cable 40. During injection, the pressure detecting element 36 can detect the pressure inside the cylinder of the syringe 200 and transmit the detection signal to the main board 50 through the cable 40.

For another example, referring to fig. 4 and 9, the push-pull box assembly 30 of the present embodiment further includes: a push-pull box motor 32, an output gear 33, a linkage gear 34 and a jaw clamp 35. The push-pull box motor 32, the output gear 33 and the linkage gear 34 are all disposed in the box body 31. The main board 50 is electrically connected with the push-pull box motor 32 through a cable 40, the push-pull box motor 32 is in driving connection with the output gear 33, and the output gear 33 is in transmission connection with the linkage gear 34. The claw grip 35 is disposed outside the case 31 and connected to the interlocking gear 34.

The jaw clamp 35 is mainly used for clamping a piston of the syringe 200, the jaw clamp 35 of this embodiment includes a first jaw arm 351 and a second jaw arm 352 which are matched with each other, the linkage gear 34 includes a first sub gear 341 and a second sub gear 342 which are linked, the first sub gear 341 and the first jaw arm 351 are locked by a screw, the second sub gear 342 and the second jaw arm 352 are locked by a screw, the box-pushing and pulling motor 32 drives the output gear 33 to rotate, the output gear 33 drives the first sub gear 341 and the second sub gear 342 to move, and the first sub gear 341 and the second sub gear 342 further drive the first jaw arm 351 and the second jaw arm 352 to rotate in opposite directions or the same direction at the same time. The main board 50 can transmit corresponding control signals to the push-pull box motor 32 through the cable 40 to control the push-pull box motor 32 to drive the linkage gear 34 to drive the jaw 35 to open or close. When the jaws 35 are opened, the grip on the plunger of the syringe 200 can be released, and when the jaws 35 are closed, the jaws 35 grip the plunger of the syringe 200.

It should be noted that, in this embodiment, the function of the cable 40 is illustrated only by providing the push-pull box assembly 30 with the pressure detection element 36 and the push-pull box motor 32, in fact, all push-pull box assemblies are not provided with the push-pull box motor, in some embodiments, the claw clamp is opened and closed manually, the syringe pump is not provided with the push-pull box motor, and naturally, the cable is not required to be used to connect the push-pull box motor and the main board, and similarly, in some embodiments, the push-pull box assembly is not necessarily provided with the pressure detection element. However, it should be understood that, as long as the push-pull box assembly is provided with a component that needs to be connected to the main board through a cable, the cable for connecting the main board and the component is the cable 40 described in the present application.

In the correlation technique, the push-and-pull box subassembly is connected with the second slider through a connecting axle usually, the connecting axle sets up with the parallel interval of lead screw, in order to be convenient for walk the line, in the correlation technique, there is the setting mode that sets up the connecting axle into hollow structure, the inside of connecting axle is worn to establish by the cable, also there is the setting mode of walking the line outside the connecting axle alone, however, no matter wear to establish the inside at the connecting axle with the cable, still walk the line outside the connecting axle alone, the connecting axle and the lead screw that the parallel interval set up all need occupy great installation space, make the volume of syringe pump great from this.

In the embodiment, a hollow shaft 12 is provided, a screw 13 is inserted into an installation channel 12a of the hollow shaft 12, the screw 13 can rotate in the installation channel 12a under the driving of a driving mechanism 16, so as to convert the rotation motion of the screw 13 into the linear motion of the second slider 112, and further, the second slider 112 can drive the push-pull box assembly 30 connected with the hollow shaft 12 to reciprocate along the axial direction of the screw 13 (i.e., the direction indicated by the double arrow at a position a in fig. 5) in the moving process. And along the axial of hollow shaft 12, the line of cable 40 passes a part of the installation channel 12a at least, and separate cable 40 and feed screw 13 through hollow shaft 12, that is, this embodiment has designed a hollow shaft 12 of a special structure, feed screw 13 can cup joint with hollow shaft 12, cable 40 can also be arranged along hollow shaft 12, meanwhile, hollow shaft 12 utilizes self structure, can also separate cable 40 and feed screw 13, compare with connecting axle and feed screw 13 that the parallel interval set up, this kind of mode of setting not only can save the installation space, can also avoid feed screw 13 to damage cable 40 in the rotation process.

The phrase "the cable 40 passes through at least a portion of the mounting channel 12a along the axial direction of the hollow shaft 12" as used herein includes that the cable 40 can pass through the entire mounting channel 12a along the axial direction of the hollow shaft 12, for example, the cable 40 passes through the mounting channel 12a from an opening of the mounting channel 12a near one end of the push-pull box assembly 30, and protrudes from an opening of the mounting channel 12a at an end far away from the push-pull box assembly 30 (or vice versa), or a threading opening (such as a first threading opening 12d shown in fig. 6 and a second threading opening 12' ″ shown in fig. 13) is formed in a side wall of the hollow shaft 12, and the cable 40 passes through only one section of the mounting channel 12a along the axial direction of the hollow shaft 12, and the cable 40 protrudes from the outer side of the hollow shaft 12 into the mounting channel 12a through the threading opening or protrudes from the mounting channel 12a to the outer side of the hollow shaft 12 through the threading opening.

The reciprocating motion described in this application means when needing to inject, under the drive of the second slider 112, the push-pull box assembly 30 can push the injector 200 to move to the direction of injection, after the injection is completed and the injector 200 is taken off from the injection pump 100, the push-pull box assembly 30 can be immediately driven to move to the opposite direction by the second slider 112, so that the push-pull box assembly 30 resets, and also can not immediately reset, but when needing to inject next time, the push-pull box assembly 30 is firstly driven to move to the opposite direction by the second slider 112, and after the push-pull box assembly 30 resets, a new injector 200 is mounted. That is, the reciprocating motion described herein primarily means that the push-pull box assembly 30 can move in two opposite directions, and does not require that the push-pull box assembly 30 must continue to move between the two opposite directions for a certain period of time.

The driving mechanism 16 of the present embodiment may be a motor having a driving function, such as a stepping motor, and the main board 50 may use various existing chips having signal input and signal output as a control device, and may be controlled by an electric signal control method, a software control method, or the like. The cable 40 may be a Flexible Flat Cable (FFC) or other cable capable of transmitting an electrical signal.

Referring to fig. 7 and 8, the hollow axle 12 of the present embodiment includes an axle body 121 having a mounting channel 12a, and a wire protection assembly 122 disposed in the mounting channel 12 a. The cable 40 is inserted into the installation passage 12a, and the wire protecting assembly 122 separates the screw 13 and the cable 40.

Specifically, the wire protecting assembly 122 of the present embodiment is a sleeve 122 'sleeved in the shaft body 121, and the sleeve 122' divides the installation channel 12a into a first sub-channel 12b and a second sub-channel 12 c. The screw 13 is inserted into the first sub-channel 12b, and the cable 40 is inserted into the second sub-channel 12 c. The first sub-channel 12b of this embodiment is around the second sub-channel 12c, i.e. the sleeve 122 'is not connected to the inner sidewall of the shaft 121 at the mounting channel 12a, in other embodiments, the sleeve 122' may also be connected to the inner sidewall of the shaft 121 at the mounting channel 12 a. The size of the first sub-channel 12b needs to take into consideration the rotation deviation of the screw 13 during the rotation process, so as to prevent the screw 13 from contacting the side wall of the sleeve 122' located at the first sub-channel 12b, and at the same time, ensure that the second sub-channel 12c has enough space for the cable 40 to pass through. The sleeve 122 'may be directly connected to the second sliding member 112, or may be connected to the sleeve 122' at two ends of the hollow shaft 12 along the radial direction of the hollow shaft 12 by using fasteners such as bolts, or some connecting plates may be arranged between the hollow shaft 12 and the sleeve 122 'at intervals along the radial direction of the hollow shaft 12, as long as it is ensured that the penetration of the cable 40 and the lead screw 13 is not affected while the sleeve 122' is fixed. Further, the sleeve 122 ' of the present embodiment includes a first sub-sleeve 1221 ' and a second sub-sleeve 1222 '. The second sub-sleeve 1222 'is sleeved in the first sub-sleeve 1221', that is, the sleeve 122 'of the present embodiment has a double-layer structure, and the purpose of the double-layer structure of the sleeve 122' is that, in some unexpected situations, the first sub-sleeve 1221 'may contact with the shaft body 121 to be worn, and when the first sub-sleeve 1221' is worn, the second sub-sleeve 1222 'may still separate the cable 40 from the lead screw 13, thereby improving the protection performance of the sleeve 122'.

The sleeve 122 ' of the present embodiment is a circular tube, and it is understood that the sleeve 122 ' may have various shapes, for example, the sleeve 122 ' may be a square tube, a rectangular tube, a triangular tube, an elliptical tube, a special-shaped tube, etc., as long as the lead screw 13 and the cable 40 can be separated. The sleeve 122' may have a single-layer structure or a multi-layer structure, which is not limited herein.

In other embodiments, the wire guard assembly 122 may have other configurations, for example, referring to fig. 10, in one embodiment, the wire guard assembly 122 of the quill 12 'is a partition 122' disposed in the mounting channel 12 'a, and the partition 122' may have a planar configuration, a curved configuration, or a mesh configuration. A partition 122 ″ partitions the mounting channel 12 ' a into adjacent third and fourth sub-channels 12 ' e and 12 ' f, the screw 13 is inserted in the third sub-channel 12 ' e, and the cable 40 is inserted in the fourth sub-channel 12 ' f. For another example, referring to fig. 11 and 12, in another embodiment, the wire protecting members 122 of the hollow shaft 12 ' are elastic catches 122 ', and the number of the elastic catches 122 ' is two; two resilient catches 122 "'are provided on the side walls of the shaft 121 at the mounting channel 12"' a, at intervals in the axial direction of the shaft 121. The cable 40 snaps into the latching grooves 122 "'a of the two resilient snaps 122"', the screw 13 being located on the side of the two resilient snaps 122 "'facing away from the latching grooves 122"'. That is, the cable 40 may be secured by two resilient catches 122' ″ to prevent the cable 40 from contacting the screw 13. In summary, the wire protecting assembly 122 may have various structures as long as the wire protecting assembly 122 can separate the cable 40 from the lead screw 13.

In other embodiments, the thread guard assembly 122 may not be provided, for example, referring to fig. 13, in an embodiment, a side wall of the hollow shaft 12 'is formed with a second thread passing port 12' b communicating with the mounting channel 12 'a, the second thread passing port 12' b is located at a side of the hollow shaft 12 'close to the push-pull box assembly 30, and the screw 13 is located at a side of the second thread passing port 12' b away from the push-pull box assembly 30. The end of the cable 40 remote from the push-pull box assembly 30 is located outside the quill 12' ″, and is connected to the main plate 50; an end of the cable 40 near the push-pull box assembly 30 is threaded into the mounting channel 12 '″ from the second threading port 12' ″ b and is connected with the push-pull box assembly 30. That is, the screw 13 is still inserted in the mounting passage 12 'a of the quill 12' ″, but the screw 13 is disposed at a position to ensure that the end of the screw 13 close to the push-pull box assembly 30 does not pass the second threading port 12 '″ to ensure that the screw 13 does not interfere with the cable 40 located in the mounting passage 12' ″. The cable 40 is mainly arranged outside the hollow shaft 12 ', and the hollow shaft 12' separates the cable 40 from the screw rod 13, so that the arrangement can save the installation space and prevent the screw rod 13 from damaging the cable 40 in the rotating process. Further, to facilitate the fixation of the cable 40, a portion of the cable 40 located outside the hollow shaft 122 ' ″ may be fixed to an outer wall of the hollow shaft 122 ' ″ in the axial direction of the hollow shaft 122 ' ″. For example, a portion of the cable 40 may be bonded to the outer wall of the tubular shaft 122 '″, or the cable 40 may be secured to the outer wall of the tubular shaft 12' ″ by being encapsulated.

Referring to fig. 3 to 6, a first threading opening 12d is formed on a side wall of the shaft body 121 of the present embodiment, and the first threading opening 12d is communicated with the second sub-channel 12c and is located at an end of the shaft body 121 close to the second sliding member 112. One end of the cable 40 close to the push-pull box assembly 30 is connected with the push-pull box assembly 30, and one end of the cable 40 far away from the push-pull box assembly 30 extends out of the shaft body 121 from the first threading opening 12d and is connected with the main board 50.

Specifically, the main board 50 and the seat body 15 of the present embodiment are both disposed on the bottom wall of the housing 20 at the inner cavity 20 a. The main board 50 is located at one side of the seat body 15 and is close to one end of the seat body 15 far away from the push-pull box assembly 30. One end of the cable 40 inserted into the second sub-passage 12c extends from the opening of the hollow shaft 12 at the end away from the second slider 112 and is connected to the push-pull box assembly 30, while the other end extends from the opening of the hollow shaft 12 at the end close to the second slider 112, but extends from the first threading opening 12d formed on the side wall of the hollow shaft 12 and is connected to the main board 50. The first threading opening 12d may be provided to facilitate connection of the cable 40 with the main board 50 provided at various positions, that is, may be more flexible when the position of the main board 50 is arranged. It will be appreciated that in other embodiments, the first threading opening 12d may not be provided, and the cable 40 may extend directly from the opening of the hollow axle 12 near the end of the second slider 112.

Referring to fig. 1 to 9, a syringe pump 100 according to an embodiment of the present application includes: the pump body device comprises a shell 20, a push-pull box assembly 30, a pump body device 10, a main board 50 and a cable 40. The housing 20 has an inner cavity 20 a. The push-pull box assembly 30 is disposed outside the housing 20. The pump body device 10 is disposed in the inner cavity 20 a. The pump body device 10 includes: seat body 15, sliding assembly 11, hollow shaft 12, lead screw 13 and actuating mechanism 16. The seat body 15 is disposed on the bottom wall of the housing 20 at the inner cavity 20 a. The sliding assembly 11 includes two guide rods 111 ' spaced in parallel on the seat body 15, and a sliding block 112 ' inserted through the two guide rods 111 '. The hollow shaft 12 is arranged between the two guide rods 111 ', one end of the hollow shaft 12 is connected with the sliding block 112 ', and the end of the hollow shaft 12 far away from the sliding block 112 ' is connected with the push-pull box assembly 30. The hollow shaft 12 includes a shaft body 121 and a sleeve 122 ' sleeved in the shaft body 121, the shaft body 121 has a mounting channel 12a extending along an axial direction, the sleeve 122 ' divides the mounting channel 12a into a first sub-channel 12b and a second sub-channel 12c, and a first threading opening 12d communicated with the second sub-channel 12c is formed on a side wall of one end of the shaft body 121 close to the slider 112 '. The screw 13 is inserted into the first sub-channel 12b and connected to the slider 112'. The drive mechanism 16 is in driving connection with the screw 13. The screw 13 is driven by the driving mechanism 16 to convert the rotation of the screw into a linear motion of the slider 112 ', so that the slider 112' drives the push-pull box assembly 30 connected to the hollow shaft 12 to reciprocate relative to the seat body 15. The main board 50 is disposed in the inner cavity 20a and located at one side of the seat body 15. The main plate 50 is connected to the bottom wall of the housing 20 at the inner cavity 20a and is near an end of the hollow shaft 12 away from the push-pull box assembly 30. The cable 40 is arranged in the second sub-channel 12c in a penetrating manner, one end of the cable 40 close to the push-pull box assembly 30 is connected with the push-pull box assembly 30, and one end of the cable 40 far away from the push-pull box assembly 30 extends out of the shaft body 121 from the first threading opening 12d and is connected with the main board 50.

Specifically, the guide rod 111 'of the present embodiment is the aforementioned first sliding member 111, and the sliding block 112' is the aforementioned second sliding member 112. Referring to fig. 7, a first mounting hole 112 ' a and a second mounting hole 112 ' b are formed at an interval on the slider 112 ' of the present embodiment. The first mounting hole 112 ' a is a closed hole along the axial projection, the second mounting hole 112 ' b is a semi-closed hole along the axial projection, one of the two guide rods 111 ' is arranged in the first mounting hole 112 ' a in a penetrating manner, and the other guide rod is arranged in the second mounting hole 112 ' b in a penetrating manner. That is to say, the sliding assembly 11 of the present embodiment is a dual guide rod and a sliding block 112 ', and please refer to fig. 7, the "projection of the first mounting hole 112 ' a along the axial direction is a closed hole" in the present embodiment mainly means that at least a part of the side wall of the first mounting hole 112 ' a is a closed structure with a ring shape, so that the guide rod 111 ' penetrating through the first mounting hole 112 ' a can be constrained in the radial direction, and the "projection of the second mounting hole 112 ' b along the axial direction is a semi-closed hole" mainly means that at least a notch arranged along the axial direction is formed on the side wall of the second mounting hole 112 ' b, so that the guide rod 111 ' penetrating through the second mounting hole 112 ' b can have a certain offset in the radial direction. That is, with the second mounting hole 112 'b, it is possible to leave a certain adjustment margin for the slider 112' in the direction perpendicular to the guide bar 111 'to ensure the guide accuracy of the guide bar 111'. It is understood that the number of the guide rods 111 'is not limited to two, and in other embodiments, the number of the guide rods 111' may be one or more than two. The cross-sectional shape of the guide bar 111 'is not limited, for example, the cross-section of the guide bar 111' may be circular, triangular, rectangular, irregular, etc., as long as the guide bar 111 'can be engaged with the slider 112'. In other embodiments, the first sliding member 111 may be a sliding groove, and the second sliding member 112 may be a guide block engaged with the sliding groove, or the first sliding member 111 may be a guide rail, and the second sliding member 112 may be a guide base having a guide wheel, as long as the first sliding member 111 and the second sliding member 112 can be engaged with each other.

In the related art, in order to ensure smooth movement of the slider, some pump body devices need to apply a certain amount of lubricant or grease on the slider and/or the guide rod, but excess lubricant or grease falls into other structures of the pump body device during sliding of the slider. And the other pump body devices adopt plastic sliders, the sliding requirements are met through self-lubricating property of the sliders, and the sliders are relatively poor in guiding precision although lubricant or lubricating grease is not required to be applied.

In order to solve the above problem, referring to fig. 7, the sliding assembly 11 of the present embodiment further includes an oil-containing bushing 113 disposed on the sliding block 112 ', and the sliding block 112 ' is slidably connected to the guide rod 111 ' through the oil-containing bushing 113. That is, in the present embodiment, one oil-containing bushing 113 is disposed in each of the first mounting hole 112 'a and the second mounting hole 112' b, two guide rods 111 'are actually inserted into the corresponding oil-containing bushings 113, and the oil-containing bushings 113 are slidably connected to the guide rods 111'. Meanwhile, in order to ensure that the slider 112 'inserted into the guide rod 111' has a certain adjustment margin, when the oil-containing bush 113 is installed, one oil-containing bush 113 is interference-fitted into the first installation hole 112 'a, and the oil-containing bush 113 installed in the second installation hole 112' b may open a degree of freedom between the two guide rods 111 ', and further may release a degree of freedom in a direction perpendicular to the guide rods 111', that is, the oil-containing bush 113 disposed in the second installation hole 112 'b may be shifted in the second installation hole 112' b in a radial direction of the guide rods 111 ', but may not be removed from the second installation hole 112' b. Because the oil-containing bush 113 has good self-lubricating property and high guiding precision, smooth movement of the slide block 112 'is ensured without lubricant or grease between the slide block 112' and the guide rod 111 ', and the guiding precision of the slide block 112' can be ensured to meet the use requirement of the injection pump 100 while avoiding the lubricant or grease from falling into other structures of the injection pump 100 to pollute the injection pump 100. It is understood that in other embodiments, the oil bushing 113 may not be disposed in the first and second mounting holes 112 'a and 112' b.

Referring to fig. 4 and 7, the pump body device 10 of the present embodiment further includes a nut 14 disposed on the screw 13. The slider 112' is connected to the nut 14.

In the related technology, a syringe pump adopts a mode that a screw rod is matched with a clutch nut to realize transmission of a sliding block, the screw rod and the clutch nut can be separated, the syringe pump can only drive a push-pull box assembly to push a syringe to move towards the injection direction through the matching of a driving mechanism and a transmission assembly in the using process, when the injection is completed and the push-pull box assembly needs to be reset, an operator needs to manually rotate the push-pull box assembly, for example, to separate the screw rod from the clutch nut, and then continuously manually pull the push-pull box assembly back towards the opposite direction, namely, the syringe pump is actually in a semi-manual operation mode, the push-pull box assembly is driven to move through the driving mechanism during the injection, and the push-pull box assembly is manually pulled back during the reset.

The screw 13 and the nut 14 of the present embodiment cannot be separated from each other, and at the same time, the nut 14 can linearly reciprocate along the screw 13 under the driving of the driving mechanism 16, so that the push-pull box assembly 30 connected to the slider 112' through the hollow shaft 12 can be electrically controlled to move in the direction of pushing the syringe 200 to inject or reset, thereby eliminating the trouble of manual operation. In addition, when the push-pull box assembly 30 is reset, since the lead screw 13 and the nut 14 do not need to be separated manually, a corresponding mechanical structure does not need to be configured for separating the lead screw 13 and the nut 14, and thus, the installation space can be further saved. The screw 13 of the present embodiment is directly screwed with the nut 14, and in another embodiment, the screw 13 may also be a ball screw, that is, balls are arranged between the screw 13 and the nut 14, or the screw 13 may also be directly screwed with the slider 112 'without the nut 14, as long as the screw 13 or the screw 13 is matched with other intermediate members, so that the rotary motion of the screw 13 can be converted into the linear motion of the slider 112'.

Referring to fig. 7, a third mounting hole 112 'c communicating with the mounting channel 12a is formed on the slider 112' of the present embodiment; the nut 14 is detachably disposed in the third mounting hole 112' c.

Specifically, the nut 14 is disposed in the third mounting hole 112 ' c and is screw-coupled with the slider 112 ', and at the same time, an end of the hollow shaft 12 adjacent to the nut 14 is also inserted into the third mounting hole 112 ' c. That is, the nut 14 is disposed inside the slider 112 ', so that the installation space of the nut 14 can be saved, and the nut 14 is screwed with the slider 112 ', so that the slider 112 ' and the nut 14 can be conveniently assembled and disassembled. It is understood that in other embodiments, the nut 14 may be fixedly connected to the slider 112'.

Referring to fig. 7, the pump device 10 of the present embodiment further includes two bearings 18 disposed adjacent to each other on the seat body 15. One end of the screw rod 13 in driving connection with the driving mechanism 16 is arranged in the two bearings 18 in a penetrating way, and one end of the screw rod 13 far away from the bearings 18 is a free end.

In the related art, one end of a screw rod of the injection pump is supported by a bearing, and the end of the screw rod far away from the bearing is matched with a copper sleeve to be used as a rotary support. However, the installation accuracy of the arrangement mode is poor, the risk of pump clamping exists, in the rotating process of the screw rod, the noise of one end, far away from the bearing, of the screw rod is large, the copper sleeve is seriously abraded, and then certain safety risk exists.

The end of the screw 13, which is connected to the driving mechanism 16 in a driving manner, of the present embodiment is supported by two bearings 18, and more specifically, the bearing 18 of the present embodiment is a deep groove ball bearing, and a gasket 19 is interposed between the two deep groove ball bearings. While the end of the screw 13 remote from the bearing 18 is not provided with a support structure. Because two bearings 18 can bear great axial force, so, under the condition that the one end that the lead screw 13 keeps away from bearing 18 does not set up bearing structure, also can guarantee the stationarity of high-speed motion, simultaneously, because the one end that the lead screw 13 keeps away from bearing 18 need not set up bearing structure such as copper sheathing, so, the lead screw 13 of this embodiment can reduce the motion noise at rotatory in-process to there is not the risk of card pump and wearing and tearing bearing structure, and then greatly improved syringe pump 100's security.

It will be appreciated that in other embodiments, the bearing 18 may be an angular contact bearing, and that both angular contact bearings may be mounted back-to-back DB or face-to-face DF. In other embodiments, only one bearing 18 may be provided at one end of the screw 13, two or more bearings 18 may be provided, or one or more bearings 18 may be provided at both ends of the screw 13.

Referring to fig. 4, the syringe pump 100 of the present embodiment further includes a pulley mechanism 17, wherein the pulley mechanism 17 includes: a timing belt 171, a primary gear 172, and a secondary gear 173. The output shaft of the driving motor is in driving connection with a primary gear 172 through a synchronous belt 171, the primary gear 172 is in meshing transmission with a secondary gear 173, and the secondary gear 173 is fixedly connected with the screw rod 13. That is, the driving mechanism 16 of the present embodiment drives the screw 13 by the transmission of the pulley mechanism 17.

Specifically, in the related art, a gear assembly is mostly needed to be used for transmission between the driving motor and the screw rod, the gear assembly is directly in driving connection with the driving motor, and the driving motor drives the screw rod to rotate through the gear assembly. The arrangement of the gear assembly can ensure that the output of the torque of the driving motor is amplified, and the rotating speed of the screw rod can meet the requirement. However, in the process of quick loading, the driving motor needs to run at a high speed, the conventional gear assembly not only brings huge noise in the rotating process, but also can sharply reduce the service life of the driving motor and the gear assembly, and in addition, the connecting mode has no overload protection, so that accidents are easy to happen.

The syringe pump 100 of the present embodiment adopts a two-stage transmission structure, the first stage is synchronous pulley transmission, i.e. the output shaft of the driving motor is in driving connection with the first-stage gear 172 through the synchronous belt 171, instead of directly driving the output shaft of the driving motor to be in driving connection with the first-stage gear 172, the second stage is that the first-stage gear 172 is in meshing transmission with the second-stage gear 173. Adopt synchronous pulley's structure, can guarantee the accurate transmission of driving motor output revolution, simultaneously, synchronous belt 171 can provide overload protection for driving motor, and the elasticity that synchronous belt 171 self has can also reduce transmission noise, makes the drive assembly of this embodiment still improve syringe pump 100's security when possessing the function of making an uproar of falling from this. It will be appreciated that in other embodiments, a conventional gear mechanism without a timing belt may be used instead of the pulley mechanism 17.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (12)

1. A syringe pump, comprising:

a housing having an interior cavity;

the push-pull box assembly is arranged outside the shell;

a pump body device disposed in the inner cavity; the pump body device includes: the device comprises a base body, a sliding assembly, a hollow shaft, a screw rod and a driving mechanism; the sliding assembly comprises a first sliding part arranged on the base body and a second sliding part connected with the first sliding part in a sliding manner; one end of the hollow shaft is connected with the second sliding piece, and one end of the hollow shaft, which is far away from the second sliding piece, is connected with the push-pull box assembly; the hollow shaft is provided with an installation channel extending along the axial direction, and the screw rod is arranged in the installation channel in a penetrating mode and is in transmission connection with the second sliding piece; the driving mechanism is in driving connection with the screw rod; the screw rod converts the rotation motion of the screw rod into the linear motion of the second sliding part through the driving of the driving mechanism, so that the second sliding part drives the push-pull box assembly connected with the hollow shaft to reciprocate relative to the base;

a main board disposed in the inner cavity;

the cable penetrates through at least one part of the installation channel along the axial direction of the hollow shaft so as to connect the main board and the push-pull box assembly; the hollow shaft separates the cable from the lead screw.

2. The syringe pump of claim 1, wherein the hollow shaft comprises a shaft body having the mounting channel, and a cable guard assembly disposed in the mounting channel;

the cable is arranged in the installation channel in a penetrating mode, and the lead screw and the cable are separated by the wire protection assembly.

3. The syringe pump of claim 2, wherein the wire guard assembly is a sleeve sleeved in the shaft body, the sleeve dividing the mounting channel into a first sub-channel and a second sub-channel;

the screw rod is arranged in the first sub-channel in a penetrating mode, and the cable is arranged in the second sub-channel in a penetrating mode.

4. The syringe pump of claim 3, wherein the sleeve comprises a first sub-sleeve and a second sub-sleeve; the second sub-sleeve is sleeved in the first sub-sleeve.

5. The syringe pump of claim 3, wherein a first threading port is formed in a side wall of the shaft body, the first threading port being in communication with the second sub-channel and located at an end of the shaft body adjacent to the second slider;

one end, close to the push-pull box assembly, of the cable is connected with the push-pull box assembly, and one end, far away from the push-pull box assembly, of the cable extends out of the shaft body from the first threading opening and is connected with the main board.

6. The syringe pump of claim 2, wherein the wire guard assembly is a partition disposed in the mounting channel, the partition dividing the mounting channel into adjacent third and fourth sub-channels; the screw rod is arranged in the third sub-channel in a penetrating mode, and the cable is arranged in the fourth sub-channel in a penetrating mode; or the like, or, alternatively,

the wire protecting assembly is an elastic buckle, and the number of the elastic buckles is two; the two elastic buckles are arranged on the side wall of the shaft body at the installation channel at intervals along the axial direction of the shaft body;

the cable joint is in two in the draw-in groove of elasticity buckle, the lead screw is located two the elasticity buckle deviates from one side of draw-in groove.

7. The syringe pump of claim 1, wherein a second threading opening is formed in a side wall of the hollow shaft and communicates with the mounting channel, the second threading opening is located at a side of the hollow shaft close to the push-pull box assembly, and the lead screw is located at a side of the second threading opening far away from the push-pull box assembly;

one end of the cable, which is far away from the push-pull box assembly, is positioned on the outer side of the hollow shaft and is connected with the main board; one end of the cable close to the push-pull box assembly penetrates into the installation channel from the second threading opening and is connected with the push-pull box assembly.

8. The syringe pump of claim 7, wherein the cable is fixed to the outer wall of the hollow shaft in the axial direction of the hollow shaft at a portion of the cable located outside the hollow shaft.

9. The syringe pump of any of claims 1, 2, and 7, wherein the main plate and the housing are both disposed on a bottom wall of the housing at the inner cavity; the main board is located on one side of the seat body and is close to one end, far away from the push-pull box assembly, of the hollow shaft.

10. The syringe pump of any of claims 1, 2, and 7, wherein the push-pull cassette assembly comprises: the pressure detection device comprises a box body and a pressure detection element arranged in the box body; the pressure detection element is electrically connected with the main board through the cable.

11. The syringe pump of claim 10, wherein the push-pull cassette assembly further comprises: the push-pull box comprises a push-pull box motor, an output gear, a linkage gear and a claw clamp;

the push-pull box motor, the output gear and the linkage gear are all arranged in the box body;

the main board is electrically connected with the push-pull box motor through the cable, the push-pull box motor is in driving connection with the output gear, and the output gear is in driving connection with the linkage gear;

the claw clamp is arranged outside the box body and is connected with the linkage gear;

the main board controls the push-pull box motor to drive the linkage gear to drive the claw clamp to open or close.

12. A syringe pump, comprising:

a housing having an interior cavity;

the push-pull box assembly is arranged outside the shell;

a pump body device disposed in the inner cavity; the pump body device includes: the device comprises a base body, a sliding assembly, a hollow shaft, a screw rod and a driving mechanism; the seat body is arranged on the bottom wall of the shell at the inner cavity; the sliding assembly comprises two guide rods arranged on the seat body in parallel at intervals and a sliding block arranged on the two guide rods in a penetrating mode; the hollow shaft is arranged between the two guide rods, one end of the hollow shaft is connected with the sliding block, and the end of the hollow shaft, far away from the sliding block, is connected with the push-pull box assembly; the hollow shaft comprises a shaft body and a sleeve sleeved in the shaft body, the shaft body is provided with an installation channel extending along the axial direction, the sleeve divides the installation channel into a first sub-channel and a second sub-channel, and a first threading opening communicated with the second sub-channel is formed in the side wall of one end, close to the sliding block, of the shaft body; the screw rod penetrates through the first sub-channel and is in transmission connection with the sliding block; the driving mechanism is in driving connection with the screw rod; the screw rod converts the rotation motion of the screw rod into the linear motion of the slide block by the driving of the driving mechanism, so that the slide block drives the push-pull box assembly connected with the hollow shaft to reciprocate relative to the base body;

the main board is arranged in the inner cavity and is positioned on one side of the seat body; the main board is connected with the bottom wall of the shell at the inner cavity, and is close to one end, far away from the push-pull box assembly, of the hollow shaft;

the cable penetrates through the second sub-channel, one end, close to the push-pull box assembly, of the cable is connected with the push-pull box assembly, and one end, far away from the push-pull box assembly, of the cable extends out of the shaft body from the first threading opening and is connected with the main board.

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