CN211486025U - Pump body device of injection pump and injection pump - Google Patents

Abstract

The embodiment of the application provides a pump body device and syringe pump of syringe pump, and pump body device includes: the transmission assembly comprises a screw rod and a nut, the screw rod is provided with a spiral groove with an arc-shaped normal cross section, and the nut is provided with a spiral tooth matched with the spiral groove; the sliding assembly comprises a first sliding part and a second sliding part which are arranged on the base body; the screw nut is arranged on the second sliding piece; the connecting shaft is connected with the second sliding piece and the push-pull box assembly; the driving mechanism is in driving connection with the transmission assembly; through the drive of the driving mechanism, the transmission assembly converts the rotary motion of the screw rod into the linear motion of the second sliding piece, so that the second sliding piece drives the push-pull box assembly connected with the connecting shaft to reciprocate relative to the base body. The pump body device of injection pump and the injection pump of this application embodiment can improve the direction precision of lead screw, when satisfying the operation requirement of injection pump, are favorable to the miniaturization of injection pump.

Description

Pump body device of injection pump and injection pump

Technical Field

The application relates to the technical field of medical equipment, especially, relate to a pump body device and syringe pump of syringe 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 mostly realizes the transmission through the cooperation of lead screw and screw, however, among the relevant art, the direction precision of lead screw is not high, can produce adverse effect to the use of injection pump.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a pump body device of a syringe pump and a syringe pump with high guiding precision.

In order to achieve the above object, a first aspect of embodiments of the present application provides a pump body device of a syringe pump, for connecting a push-pull box assembly of the syringe pump, including:

a base body;

the transmission assembly comprises a screw rod and a nut in threaded connection with the screw rod, the screw rod is provided with a spiral groove with an arc-shaped normal cross section, and the nut is provided with spiral teeth matched with the spiral groove;

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; the screw nut is arranged on the second sliding piece;

the connecting shaft is connected with the second sliding piece and the push-pull box assembly;

the driving mechanism is in driving connection with the transmission assembly; through the driving of the driving mechanism, the transmission assembly converts the rotary motion of the screw rod into the linear motion of the second sliding piece, so that the second sliding piece drives the push-pull box assembly connected with the connecting shaft to reciprocate relative to the base body.

A second aspect of embodiments of the present application provides a syringe pump comprising: a push-pull box assembly and the pump body device; the push-pull box assembly is connected with the connecting shaft.

A third aspect of embodiments of the present application provides a syringe pump comprising:

a push-pull box assembly;

a pump body device, the pump body device comprising: the device comprises a base body, a transmission assembly, a sliding assembly, a connecting shaft and a driving mechanism; the transmission assembly comprises a screw rod, a nut and a gear mechanism, the screw rod is in threaded connection with the screw rod, the gear mechanism is fixedly connected with the screw rod, the screw rod is provided with a spiral groove, the shape of the normal cross section of the spiral groove is double circular arc, the nut is provided with spiral teeth matched with the spiral groove, and the tooth form of the spiral teeth is semicircular; 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; a third mounting hole penetrating through the sliding block is formed in the sliding block; the nut is detachably arranged in the third mounting hole; the connecting shaft is a hollow shaft, and the hollow shaft is provided with an installation channel extending along the axial direction; 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 screw rod penetrates through the installation channel; the driving mechanism is in driving connection with the gear mechanism; through the driving of the driving mechanism, the transmission assembly converts the rotary motion of the screw rod into the linear motion of the slide block, so that the slide block drives the push-pull box assembly connected with the hollow shaft to reciprocate relative to the base body.

The pump body device and the syringe pump of this application embodiment set up the normal direction cross-sectional shape through the helicla flute with the lead screw into the arc, and the tooth form and the curved helicla flute phase-match of the spiral tooth of screw can improve the direction precision of lead screw, when satisfying the operation requirement of syringe pump, neither can increase the manufacturing cost of lead screw and screw, also can not occupy more installation space, and then do benefit to the miniaturization of syringe pump.

Drawings

Fig. 1 is a schematic structural view of a pump body device of a syringe pump according to an embodiment of the present application;

FIG. 2 is a schematic view of the pump body assembly of FIG. 1 from another perspective;

FIG. 3 is a schematic view of the pump body assembly of FIG. 1 from a further perspective;

FIG. 4 is a sectional view showing a partial structure of the pump body device shown in FIG. 1;

FIG. 5 is a schematic view of the screw grooves of the screw mandrel and the screw teeth of the nut shown in FIG. 4;

FIG. 6 is a schematic view showing the engagement of a spiral groove of a screw rod and a spiral tooth of a nut;

fig. 7 is a schematic structural view of the seat body shown in fig. 1;

FIG. 8 is a schematic structural view of the plunger assembly shown in FIG. 1;

FIG. 9 is a schematic view of the plunger assembly of FIG. 1 from another perspective;

FIG. 10 is an exploded view of the plunger assembly shown in FIG. 8;

FIG. 11 is a schematic structural diagram of the long potentiometer shown in FIG. 1;

FIG. 12 is a schematic view of the pump body assembly, the push-pull cassette assembly, and the mating arrangement of the cables shown in FIG. 1;

FIG. 13 is a schematic view of the mating arrangement of the jaws of the push-pull cassette assembly shown in FIG. 12 with associated structure within the cassette body;

figure 14 is an exploded view of the push-pull box assembly shown in figure 12;

fig. 15 is a schematic view of a syringe pump and a syringe according to an embodiment of the present application.

Description of the reference numerals

A syringe pump 100; a pump body device 10; a base body 11; the accommodation chamber 11 a; a first positioning hole 11 b; a second positioning hole 11 c; a stopper hole 11 d; a slide assembly 12; a first slider 121, a guide rod 121'; a second slider 122, a slider 122'; an oil-containing liner 123; the first mounting hole 122' a; a second mounting hole 122' b; third mounting holes 122' c; a connecting shaft 13 and a hollow shaft 13'; mounting channels 13' a; a first sub-channel 13' b; a second sub-channel 13' c; a shaft body 131'; a sleeve 132'; a drive assembly 14; screw rods 141, 141'; the spiral grooves 141a, 141' a; a nut 142; the helical teeth 142 a; gear mechanism 143, pulley mechanism 143'; timing belt 1431'; primary gear 1432'; secondary gear 1433'; a bearing 144; a gasket 145; a drive mechanism 15; an optical coupler 16; a first circuit board 17; a displacement monitoring element 18; a potentiometer 181, a long potentiometer 181'; a first segment 1811'; a second segment 1812'; resistor 1813'; a plunger assembly 182; contacts 1821; a body 1822; locating posts 1822 a; a mounting groove 1822 b; an interface 1822 c; a first threaded aperture 1822 d; a spring 1823; a buckle 1824; the clip 1824 a; a through-hole 1824 b; a push-pull box assembly 20; a box body 21; a case body 211; a box cover 212; a jaw drive assembly 22; a push-pull box motor 221; a second circuit board 222; a jaw transmission assembly 23; a drive gear 231; a claw clamp mechanism 25; a jaw 251; a drive gear 252; a driven gear 253; a probe assembly 26; a pressure sensor assembly 27; a bracket plate 28; a housing 30; a cable 40; 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.

In the description of the present application, "lengthwise" is based on the orientation or positional relationship shown in fig. 11, it being understood that these orientation terms are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered limiting of the present application.

Referring to fig. 1 to 5, a pump body device 10 of a syringe pump for connecting a push-pull box assembly of the syringe pump includes: seat 11, transmission assembly 14, sliding assembly 12, connecting shaft 13 and actuating mechanism 15. The transmission assembly 14 includes a screw rod 141 and a nut 142 threadedly coupled to the screw rod 141, the screw rod 141 having a spiral groove 141a having an arc-shaped normal sectional shape, and the nut 142 having a spiral thread 142a fitted to the spiral groove 141 a. The sliding assembly 12 includes a first sliding member 121 disposed on the seat 11, and a second sliding member 122 slidably connected to the first sliding member 121. The nut 142 is provided on the second slider 122. The connecting shaft 13 connects the second slider 122 and the push-pull box assembly 20. The driving mechanism 15 is in driving connection with the transmission assembly 14. Through the driving of the driving mechanism 15, the transmission assembly 14 converts the rotation motion of the screw 141 into the linear motion of the second sliding member 122, so that the second sliding member 122 drives the push-pull box assembly 20 connected to the connecting shaft 13 to reciprocate relative to the seat body 11.

Specifically, in the related art, a trapezoidal screw rod is generally adopted in the syringe pump to convert the rotation motion of the trapezoidal screw rod into the linear motion of the second sliding member, but the guiding precision of the trapezoidal screw rod is not high, which may adversely affect the use of the syringe pump. In order to improve the guiding precision, some injection pumps use a ball screw mechanism to replace a trapezoidal screw, but on one hand, the ball screw mechanism has a high cost, and on the other hand, the ball screw mechanism has a relatively complex structure, so the volume of the ball screw mechanism is relatively large, the ball screw mechanism needs to occupy a large installation space in a pump body device, and further the miniaturization of the injection pump is not facilitated.

However, the present embodiment mainly improves the conventional screw rod and the nut matched with the screw rod, the normal cross-sectional shape of the spiral groove 141a of the screw rod 141 is arc, the tooth form of the spiral tooth 142a of the nut 142 matches with the arc-shaped spiral groove 141a, that is, the tooth form of the spiral tooth 142a of the nut 142 is also arc in practice, compared with a trapezoidal screw rod, the arc-shaped screw rod 141 of the present embodiment has higher guiding precision and can meet the use requirements of the injection pump 100, and compared with a ball screw rod mechanism, the arc-shaped screw rod 141 and the nut 142 of the present embodiment have lower cost and require relatively smaller installation space, and the production cost of the injection pump 100 is reduced while the injection pump 100 is facilitated to be miniaturized.

Referring to fig. 5, the normal cross-sectional shape of the spiral groove 141a of the present embodiment is a double circular arc, and the tooth shape of the spiral tooth 142a is a semicircle. The contact angle β between the spiral groove 141a and the spiral tooth 142a can be set as required, and preferably, the contact angle β between the spiral groove 141a and the spiral tooth 142a (the included angle between the normal of the tangent point of the spiral groove 141a and the spiral tooth 142a and the perpendicular line perpendicular to the axis of the screw rod 141) is 45 °. It is understood that the spiral groove 141a may have other arc-shaped structures, for example, referring to fig. 6, the normal cross-sectional shape of the spiral groove 141 'a of the screw rod 141' may also be an ellipse, in other embodiments, the normal cross-sectional shape of the spiral groove 141a may also be a single circular arc, and the like, and the tooth form of the spiral tooth 142a may also have other arc-shaped structures, for example, the tooth form of the spiral tooth 142a may also be a single circular arc, an ellipse, a double circular arc, and the like, besides a semicircle, according to the difference of the normal cross-sectional shape of the spiral groove 141a matched with the spiral tooth 142 a.

Referring to fig. 4, a third mounting hole 122' c penetrating through the second sliding member 122 is formed on the second sliding member 122 of the present embodiment. The nut 142 is detachably disposed in the third mounting hole 122' c.

Specifically, the nut 142 is disposed in the third mounting hole 122 'c and is threadedly coupled with the second slider 122, and at the same time, one end of the coupling shaft 13 near the nut 142 is also inserted in the third mounting hole 122' c. That is, the nut 142 is disposed inside the second slider 122, so that the installation space of the nut 142 can be saved, and the nut 142 is screwed to the second slider 122, so that the second slider 122 and the nut 142 can be easily assembled and disassembled. In other embodiments, the second slider 122 and the nut 142 may be integrally formed, which is equivalent to directly forming a threaded hole having the screw thread 142a in the second slider 122.

Referring to fig. 4, the transmission assembly 14 of the present embodiment further includes two bearings 144 adjacently disposed on the base 11. One end of the screw rod 141 in driving connection with the driving mechanism 15 is inserted into the two bearings 144, and one end of the screw rod 141 away from the bearings 144 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 141 of the present embodiment, which is connected to the driving mechanism 15 in a driving manner, is supported by two bearings 144, and more specifically, the bearings 144 of the present embodiment are deep groove ball bearings, and a spacer 145 is interposed between the two deep groove ball bearings. And the end of the screw 141 remote from the bearing 144 is not provided with a support structure. Because two bearings 144 can bear great axial force, so, under the condition that the one end that lead screw 141 keeps away from bearing 144 does not set up bearing structure, also can guarantee the stationarity of high-speed motion, simultaneously, because the one end that lead screw 141 keeps away from bearing 144 need not set up bearing structure such as copper sheathing, so, the lead screw 141 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 144 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 144 may be provided at one end of the screw rod 141, two or more bearings 144 may be provided, or one or more bearings 144 may be provided at both ends of the screw rod 141.

Referring to fig. 4, the connecting shaft 13 of the present embodiment is a hollow shaft 13 ', the hollow shaft 13' has an installation channel 13 'a extending along the axial direction, and the screw rod 141 is inserted into the installation channel 13' a.

In the related art, the push-pull box assembly is usually connected to the second sliding member through a connecting shaft, and the connecting shaft and the lead screw are arranged in parallel at intervals, so that the connecting shaft and the lead screw need to occupy a large installation space in the base body, and the pump body device has a large volume.

In the embodiment, the connecting shaft 13 is designed as a hollow shaft 13 ', the hollow shaft 13 ' is connected to the second sliding member 122 while being sleeved with the lead screw 141, and the lead screw 141 can rotate in the hollow shaft 13 ' to convert the rotation thereof into the linear motion of the second sliding member 122. The drive mechanism 15 may be a motor having a drive function such as a stepping motor. Since the second slider 122 can perform a reciprocating linear motion along the axial direction of the screw rod 141 (i.e. the direction indicated by the double-headed arrow at a in fig. 1) under the driving of the driving mechanism 15, the second slider 122 can bring the push-pull box assembly 20 connected with the hollow shaft 13' into a reciprocating motion along the axial direction of the screw rod 141 during the motion process. Compared with the connecting shaft and the screw rod which are arranged in parallel at intervals, the sleeved hollow shaft 13' and the screw rod 141 can greatly save the installation space, so that the structure of the pump body device 10 can be more compact, and further the whole structure of the injection pump 100 can be more compact. The reciprocating motion described in the present application means that when an injection is needed, the push-pull box assembly 20 can push the injector 200 (refer to fig. 15) to move in the injection direction under the driving of the second slider 122, and after the injection is completed and the injector 200 is taken off from the injection pump 100, the push-pull box assembly 20 can be immediately driven to move in the opposite direction by the second slider 122, so that the push-pull box assembly 20 is reset, or not reset immediately, but when an injection is needed next time, the push-pull box assembly 20 is driven to move in the opposite direction by the second slider 122 first, and after the push-pull box assembly 20 is reset, a new injector 200 is mounted. That is, the reciprocating motion described herein primarily means that the push-pull cassette assembly 20 can move in two opposite directions, and does not require that the push-pull cassette assembly 20 must continue to move between the two opposite directions for a certain period of time. It is understood that in other embodiments, instead of the hollow shaft 13', a common connecting shaft 13 may be used, and the lead screw 141 may be disposed in parallel with the connecting shaft 13 at a distance.

Referring to fig. 1 to 15, a syringe pump 100 includes a push-pull cassette assembly 20 and the pump body assembly 10. The push-pull box assembly 20 is connected with the connecting shaft 13.

Specifically, the connecting shaft 13 of the present embodiment is a hollow shaft 13 ', the syringe pump 100 further includes a housing 30 having an inner cavity (not shown), the push-pull box assembly 20 is disposed outside the housing 30, the pump body device 10 has an inner cavity, and the hollow shaft 13' extends from the inner cavity to the outside of the housing 30 and is connected with the push-pull box assembly 20. Housing 30 may protect components disposed within the interior chamber and may also facilitate sterilization of syringe pump 100 after use.

Referring to fig. 1 to 4 and fig. 7, the first sliding member 121 of the present embodiment is a guide rod 121 ', the second sliding member 122 is a sliding block 122 ' penetrating through the guide rod 121 ', and the sliding block 122 ' can slide along the guide rod 121 '.

Specifically, the seat body 11 of the present embodiment has an accommodating cavity 11a, and a first positioning hole 11b, a second positioning hole 11c and a limiting hole 11d respectively communicated with the accommodating cavity 11 a. The first positioning hole 11b is disposed on a side of the seat body 11 close to the push-pull box assembly 20. The second positioning hole 11c and the first positioning hole 11b are disposed oppositely, one end of the guiding rod 121 ' is inserted into the first positioning hole 11b, and one end of the guiding rod 121 ' away from the first positioning hole 11b is inserted into the second positioning hole 11c, that is, the guiding rod 121 ' of the present embodiment is inserted into the seat body 11. Since the two guide rods 121' are provided in the present embodiment, two first positioning holes 11b and two second positioning holes 11c are correspondingly provided on the seat body 11. The limiting hole 11d is located on the same side as the first locating hole 11b, the hollow shaft 13 ' is inserted into the limiting hole 11d, and the hollow shaft 13 ' can reciprocate along the axial direction of the limiting hole 11d under the driving of the sliding block 122 '. The limiting hole 11d can guide the hollow shaft 13 'so that the hollow shaft 13' can move more stably in the reciprocating process.

Further, the slider 122 ' is formed with first and second mounting holes 122 ' a and 122 ' b spaced apart from each other. The axial projection of the first mounting hole 122 ' a is a closed hole, the axial projection of the second mounting hole 122 ' b is a semi-closed hole, one of the two guide rods 121 ' is arranged in the first mounting hole 122 ' a in a penetrating manner, and the other guide rod is arranged in the second mounting hole 122 ' b in a penetrating manner. That is to say, the sliding assembly 12 of the present embodiment is a dual guide rod and is matched with the sliding block 122 ', and meanwhile, referring to fig. 4, the term "the projection of the first mounting hole 122 ' 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 122 ' a is a closed structure with a ring shape, so that the guide rod 121 ' penetrating through the first mounting hole 122 ' a can be constrained in the radial direction, and the term "the projection of the second mounting hole 122 ' b along the axial direction is a semi-closed hole" mainly means that at least one notch arranged along the axial direction is formed on the side wall of the second mounting hole 122 ' b, so that the guide rod 121 ' penetrating through the second mounting hole 122 ' b can have a certain offset in the radial direction. That is, with the second mounting hole 122 'b, it is possible to leave a certain adjustment margin for the slider 122' in the direction perpendicular to the guide rod 121 'to ensure the guiding accuracy of the guide rod 121'. It is understood that the number of the guide rods 121 'is not limited to two, and in other embodiments, the number of the guide rods 121' may be one or more than two. The cross-sectional shape of the guide rod 121 'is not limited, for example, the cross-section of the guide rod 121' may be circular, triangular, rectangular, irregular, etc., as long as the guide rod 121 'can be engaged with the slider 122'.

In other embodiments, the first sliding member 121 may be a sliding groove, and the second sliding member 122 may be a guide block engaged with the sliding groove, or the first sliding member 121 may be a guide rail, and the second sliding member 122 may be a guide base having a guide wheel, as long as the first sliding member 121 and the second sliding member 122 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. 4, the sliding assembly 12 of the present embodiment further includes an oil-containing bushing 123 disposed on the sliding block 122 ', and the sliding block 122 ' is slidably connected to the guide rod 121 ' through the oil-containing bushing 123. That is, in the present embodiment, one oil-containing bushing 123 is respectively disposed in the first mounting hole 122 'a and the second mounting hole 122' b, two guide rods 121 'are actually inserted into the corresponding oil-containing bushings 123, and the oil-containing bushings 123 are slidably connected to the guide rods 121'. Meanwhile, in order to ensure that the slider 122 'inserted into the guide rod 121' has a certain adjustment margin, when the oil-containing bushing 123 is installed, one oil-containing bushing 123 is in interference fit with the first installation hole 122 'a, and the oil-containing bushing 123 installed in the second installation hole 122' b can open a degree of freedom between the two guide rods 121 ', and further can release a degree of freedom in a direction perpendicular to the guide rods 121', that is, the oil-containing bushing 123 disposed in the second installation hole 122 'b can be shifted in the second installation hole 122' b in the radial direction of the guide rods 121 ', but cannot be removed from the second installation hole 122' b. Because the oil-containing bush 123 has good self-lubrication and high guiding precision, smooth movement of the slider 122 'is ensured without lubricant or grease between the slider 122' and the guide rod 121 ', and the guiding precision of the slider 122' can be ensured to meet the use requirement of the injection pump 100 while the slider 10 is prevented from being polluted by the lubricant or grease falling into other structures of the pump body device 10. In addition, referring to fig. 1, the limiting hole 11d of the present embodiment is actually provided with an oil-containing bushing 123, and the hollow shaft 13 'is inserted into the oil-containing bushing 123 in the limiting hole 11d and can slide relative to the oil-containing bushing 123, so as to improve the stability of the movement of the hollow shaft 13'. It is understood that in other embodiments, the oil-impregnated bushing 123 may not be disposed in the first mounting hole 122 'a, the second mounting hole 122' b, and the limiting hole 11 d.

Referring to fig. 1 to 3 and 8 to 11, the pump body device 10 of the present embodiment includes a displacement monitoring element 18 and a first circuit board 17. The first circuit board 17 is disposed at one end of the seat body 11 close to the push-pull box assembly 20, and is connected to a side wall of the seat body 11 far from the accommodating cavity 11 a. The displacement monitoring element 18 includes a potentiometer 181 and a plunger assembly 182 coupled to the second slider 122 and having a contact 1821. The potentiometer 181 is in contact with the contact 1821 to monitor the displacement of the second slider 122.

Specifically, the potentiometer 181 of the present embodiment is a long potentiometer 181 ' having a strip shape, and the long potentiometer 181 ' includes a first section 1811 ', a second section 1812 ' connected to the first section 1811 ', and a resistor 1813 ' provided on the first section 1811 ' in a length direction of the long potentiometer. The first segment 1811' is disposed in the receiving cavity 11a and connected with the sidewall of the holder body 11 at the receiving cavity 11 a. The second segment 1812' extends from the end of the housing body 11 where the first circuit board 17 is disposed to the outside of the receiving cavity 11 a. The second segment 1812' is bent toward a side where the first circuit board 17 is disposed, and is electrically connected to the first circuit board 17. The contact 1821 contacts the resistor 1813' to monitor the displacement of the second slider 122.

In the related art, most of the displacement of the monitoring slide block is monitored by adopting a slide wire type, a linear displacement sensor is generally required to be used in the monitoring mode, and the linear displacement sensor has a relatively large volume, so the linear displacement sensor also needs to occupy more installation space.

In the embodiment, a long potentiometer 181 ' in a strip shape is adopted, in the process of sliding the slider 122 ', the plunger assembly 182 mounted on the slider 122 ' slides along with the slider 122 ', the contact 1821 in the plunger assembly 182 is always kept in contact with the resistor 1813 ' of the long potentiometer 181 ', and according to the contact position between the contact 1821 and the resistor 1813 ', the long potentiometer 181 ' can transmit a corresponding monitoring signal to the first circuit board 17, so that the position of the slider 122 ' can be monitored. Since the long potentiometer 181' in a strip shape has a simple structure and a small volume, and does not occupy an excessive installation space, the overall structure of the pump device 10 of the present embodiment can be made more compact.

The resistor 1813 ' of this embodiment is made of a self-lubricating material POM (polyoxymethylene) so that the contacts 1821 can slide along the resistor 1813 ', and the long potentiometer 181 ' may be made of a flexible material so that the second section 1812 ' of the long potentiometer 181 ' can be bent during assembly, or may be directly preformed into the shape shown in fig. 11.

Referring to fig. 8 to 11, the plunger assembly 182 of the present embodiment mainly includes a contact 1821, a main body 1822, a positioning post 1822a, a mounting groove 1822b, a spring 1823, and a snap 1824, wherein the main body 1822 is formed with the positioning post 1822a, the mounting groove 1822b, an abutting port 1822c, and a threaded hole 1822d, the abutting port 1822c is disposed along a radial direction of the mounting groove 1822b and is communicated with the mounting groove 1822b, an axis of the threaded hole 1822d is parallel to an axis of the positioning post 1822a, and the snap 1824 is formed with a through hole 1824a and two snap legs 1824a disposed on two sides of the axis of the through hole 1824 a. When assembling the plunger assembly 182, the contact 1821 is first inserted into the mounting slot 1822b, a portion of the contact 1821 (i.e., the end in contact with the resistor 1813') extends through the mounting slot 1822b and out of the mounting slot 1822b, a portion of the spring 1823 is then inserted into the mounting slot 1822b and over the contact 1821, another portion of the spring 1823 is positioned out of the mounting slot 1822b, and finally the two prongs 1824a of the clip 1824 are inserted into the mounting slot 1822b, the portion of the spring 1823 positioned out of the mounting slot 1822b is inserted through the through-hole 1824b in the clip 1824, and the two prongs 1824a of the clip 1824 abut against the side wall of the body 1822 positioned at the opening 1822c by rotating the clip 1824. To remove the plunger assembly 182, it is only necessary to rotate the catch 1824 to the non-abutting position and, in turn, remove the catch 1824, spring 1823, and contact 1821 from the mounting slot 1822 b. When it is desired to mount the plunger assembly 182 to the slider 122 ', the positioning posts 1822a of the main body 1822 engage with positioning slots (not shown) formed in the slider 122', the spring 1823 abuts against the slider 122 'at an end thereof outside the mounting slot 1822b, the first threaded hole 1822d is aligned with a second threaded hole (not shown) formed in the slider 122', and screws are screwed into the first and second threaded holes 1822d, so that the plunger assembly 182 is fastened to the slider 122 ', that is, the plunger assembly 182 of the present embodiment is a detachable structure, and the plunger assembly 182 and the slider 122' are also detachably connected together, therefore, when the plunger assembly 182 needs to be replaced, the plunger assembly 182 can be conveniently disassembled and assembled, and when the parts of the plunger assembly 182 are damaged, the corresponding parts can be quickly replaced manually without using tools.

Referring to fig. 1 to 3 and 7, the pump body device 10 of the present embodiment further includes an optical coupler 16, and the optical coupler 16 is electrically connected to the first circuit board 17. The photo coupler 16 is mainly used to detect the start position of the push-pull box assembly 20 and transmit the detection signal to the first circuit board 17.

In the related art, a plurality of circuit boards are usually disposed in the accommodating cavity of the base, the detecting element for detecting the starting position of the push-pull box assembly is electrically connected to one circuit board, the displacement monitoring element for monitoring the displacement of the second slider is electrically connected to another circuit board, and because the number of circuit boards disposed in the accommodating cavity is large, these circuit boards occupy a large installation space in the accommodating cavity, and the displacement monitoring element 18 and the optical coupler 16 of the present embodiment share the same first circuit board 17, and the first circuit board 17 is disposed on the outer side wall of the base 11 instead of being disposed in the accommodating cavity 11a, so that the total number of circuit boards is reduced, the installation space of the accommodating cavity 11a is not occupied, and the overall structure of the pump body device 10 can be more compact.

In addition, since one end of the guide rod 121 ' of the present embodiment is fixed in the first positioning hole 11b by means of plugging, and the first circuit board 17 is actually disposed on the sidewall of the seat body 11 and covers a side of the first positioning hole 11b far away from the accommodating cavity 11a, the first circuit board 17 can act as a stop for the guide rod 121 ' when the first positioning hole 11b fails due to an accident, so as to prevent the guide rod 121 ' from slipping out of the first positioning hole 11b during the use of the syringe pump 100 and affecting the normal use of the syringe pump 100. It should be noted that, the covering mentioned here means that the first circuit board 17 can block the two first positioning holes 11b from the direction facing the first circuit board 17, that is, along the axial direction of the guide rods 121 ', the projection of the two guide rods 121' is located in the projection range of the first circuit board 17, but there may be a certain gap between the first circuit board 17 and the first positioning holes 11 b.

Referring to fig. 1 to 3 and 12, the transmission assembly 14 of the present embodiment further includes a gear mechanism 143 drivingly connected to the driving mechanism 15, and the screw rod 141 is fixedly connected to the gear mechanism 143.

Specifically, the gear mechanism 143 of the present embodiment is a pulley mechanism 143 ', and the pulley mechanism 143 ' includes a timing belt 1431 ', a primary gear 1432 ', and a secondary gear 1433 '. An output shaft of the driving mechanism 15 is in driving connection with a primary gear 1432 'through a synchronous belt 1431'; the primary gear 1432 ' is in meshed transmission with the secondary gear 1433 ', and the secondary gear 1433 ' is fixedly connected with the screw rod 141.

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

The belt pulley mechanism 143 'of the present embodiment is a two-stage transmission structure, the first stage is synchronous belt pulley transmission, that is, the output shaft of the driving mechanism 15 is drivingly connected to the first-stage gear 1432' through the synchronous belt 1431 ', instead of directly drivingly connecting the output shaft of the driving mechanism 15 to the first-stage gear 1432', and the second stage is meshing transmission of the first-stage gear 1432 'and the second-stage gear 1433'. Adopt synchronous pulley's structure, can guarantee the accurate transmission of actuating mechanism 15 output revolution, simultaneously, synchronous belt 1431' can provide overload protection for actuating mechanism 15, and the elasticity that synchronous belt 1431 'itself has can also reduce transmission noise, makes the drive assembly 14 of this embodiment possess the function of making an uproar of falling from this, has still improved syringe pump 100's security.

Referring to fig. 12 to 14, the push-pull box assembly 20 of the present embodiment includes: a cartridge body 21, a probe assembly 26, a pressure sensor assembly 27, a jaw mechanism 25 and a jaw drive assembly 22. The pressure sensor assembly 27 is disposed within the cassette body 21 and is disposed in overlying relation to the probe assembly 26. The claw grip mechanism 25 has two claw grips 251, and the claw grips 251 include drive levers and grip portions located outside the case 21. The driving rod is located at one end of the clamping part and penetrates through the box body 21. A jaw drive assembly 22 is disposed within the cartridge body 21. The jaw driving assembly 22 includes a second circuit board 222, a push-pull box motor 221 disposed on the second circuit board 222, and a jaw transmission assembly 23 connecting the push-pull box motor 221 and the driving rod. The push-pull box motor 221 and the jaw transmission assembly 23 are located at one end of the second circuit board 222. The suspended portion and the clamping portion of the second circuit board 222 form a sensor mounting space therebetween, and the stacked combination of the probe assembly 26 and the pressure sensor assembly 27 is located in the sensor mounting space.

In the syringe pump 100 of this embodiment, the driving rod and the pushing and pulling box motor 221 are connected through the claw clamp transmission assembly 23, so that the claw clamp transmission assembly 23, the pushing and pulling box motor 221 and the driving rod form a solid structure supported between the second circuit board 222 and the clamping portion while the connection is achieved, and the solid structure is located at one end of the second circuit board 222. This allows the portion of the second circuit board 222 where the push-pull box motor 221 and the jaw actuator assembly 23 are not located to be suspended from the clamping portion, i.e., the suspended portion of the second circuit board 222. The suspended portion and the clamping portion of the second circuit board 222 form a sensor mounting space, and the stacked combination of the probe assembly 26 and the pressure sensor assembly 27 is located in the sensor mounting space. Through the arrangement, the space between the second circuit board 222 and the clamping part is reasonably utilized, the probe assembly 26 and the pressure sensor assembly 27 are prevented from occupying extra space in the push-pull box assembly 20, the structural compactness of internal parts of the push-pull box assembly 20 is effectively improved, and the whole volume of the push-pull box assembly 20 is reduced.

In this embodiment, the box body 21 includes a box body 211 and a box cover 212. The jaw mechanism 25, the pressure sensor unit 27, the probe unit 26, and the jaw driving unit 22 are sequentially installed in the cassette body 211. The box cover 212 is covered on the box body 211 to facilitate the assembly of the push-pull box assembly 20. That is, the opening of the case body 211 faces the case cover 212, the jaw mechanism 25, the pressure sensor unit 27, the probe unit 26, and the jaw driving unit 22 are sequentially mounted in the case body 211 through the opening, and after the case cover 212 is covered on the case body 211, the jaw mechanism 25, the pressure sensor unit 27, the probe unit 26, and the jaw driving unit 22 are closest to the case cover 212 and are the jaw driving unit 22. The box body 211 and the box cover 212 are preferably detachably connected, for example, by screws or by snap-fit connection.

The jaw mechanism 25, the pressure sensor unit 27, the probe unit 26, and the jaw driving unit 22 may be mounted together in the case 21 after the assembly is completed outside the case 21.

The push-pull box assembly 20 of this embodiment further includes a supporting plate 28 disposed in the box body 21, the box body 211 has a positioning supporting portion for positioning and supporting with the supporting plate 28, and the second circuit board 222 is fixedly connected with the supporting plate 28. Through setting up mounting panel 28 for mounting panel 28 can cooperate with the location supporting part of box body 21, accomplishes the location supporting of location supporting part to mounting panel 28, and then accomplishes the location effect of second circuit board 222 in box body 21. The positioning support portion of the second circuit board 222 and the case body 211 may be positioned and supported, and a positioning effect may be achieved.

In this embodiment, the support plate 28 may be a sheet metal support, a support plate 28 made of other materials, or a control circuit board having control components corresponding to the probe assembly 26 and the pressure sensor assembly 27.

It will be appreciated that the mounting plate 28 is a plate-like structure for ease of manufacture and for improved compactness. For the convenience of mounting, the projection surface of the holder plate 28 covers the second circuit board 222, thereby making the holder plate 28 fit with the positioning portion of the cartridge body 211.

Of course, the bracket plate 28 may not be provided, and the jaw driving unit 22 may be directly fixed to the bracket of the pressure sensor unit 27 or may be directly fixed to the inner wall of the case 21.

In order to ensure the structural stability of the installation space and prevent the second circuit board 222 from pressing the probe assembly 26 and the pressure sensor assembly 27, the bracket plate 28 is located on a side of the second circuit board 222 facing away from the cover 212. The support plate 28 is provided with a hollow avoiding part for the push-pull box motor 221 and the jaw clamp transmission assembly 23 to pass through. That is, the supporting plate 28 can provide a supporting force far away from the clamping portion for the second circuit board 222, so that when the syringe pump 100 falls or is suddenly impacted, the second circuit board 222 is effectively supported, the stability of the connection between the push-pull box motor 221 and the driving rod of the jaw clamp transmission assembly 23 is ensured, and the condition that the second circuit board 222 extrudes the probe assembly 26 and the pressure sensor assembly 27 to cause component damage is avoided.

Further, the jaw mechanism 25 further includes a transmission gear 252 for driving the two jaw clamps 251 to move relatively, and the transmission gear 252 is disposed at an end portion of the driving rod extending into the cartridge body 211. The jaw clutch transmission assembly 23 includes a driving gear 231 driven by the push-pull cartridge motor 221, and a transmission gear 252 is engaged with the driving gear 231. The transmission gear 252 and the drive gear 231 are axially arranged in the direction of mounting the pawl holder drive unit 22 to the cartridge body 211, and the transmission gear 252 meshes with the drive gear 231 when the pawl holder drive unit 22 is mounted in position with respect to the cartridge body 211. The driving gear 231 is rotated by pushing and pulling the box motor 221, and the transmission gear 252 is meshed with the driving gear 231, the transmission gear 252 is driven by the driving gear 231 to realize the relative movement operation of the two claw clamps 251, and when the two claw clamps 251 are close to each other, the clamping of the piston handle of the injector 200 by the claw clamp mechanism 25 is completed; when the two jaws 251 are moved away from each other, the separation of the piston shaft of the syringe 200 by the jaw mechanism 25 is completed.

For the sake of easy mounting, the transmission gear 252 and the drive gear 231 are arranged in the axial direction along the mounting direction of the pawl clip driving assembly 22 to the cartridge body 211, and the transmission gear 252 is engaged with the drive gear 231 when the pawl clip driving assembly 22 is mounted in position with respect to the cartridge body 211. That is, when the gripper driving unit 22 is mounted in the cartridge body 211, the driving gear 231 of the gripper driving unit 22 is directly engaged with the transmission gear 252 of the gripper mechanism 25 already mounted on the cartridge body 211, which facilitates assembly.

In the present embodiment, the transmission gear 252 and the driving gear 231 are spur gears. Through the arrangement, the transmission gear 252 and the driving gear 231 are convenient to process and assemble. When the jaw driving assembly 22 is installed, the transmission gear 252 is parallel to the driving gear 231 in the axial direction, and the transmission gear 252 and the driving gear 231 are close to each other, so that the straight teeth of the transmission gear 252 and the straight teeth of the driving gear 231 are directly penetrated and matched, and the engagement of the straight teeth of the transmission gear 252 and the straight teeth of the driving gear 231 is completed. The jaw mechanism 25 of the present embodiment further includes a driven gear 7 engaged with the drive gear 252, and the driven gear 253 is also a spur gear.

In another embodiment, the transmission gear 252 and the driving gear 231 are bevel gears, and the large diameter end of the driving gear 231 faces the second circuit board 222. For the sake of convenience of installation, it is preferable to orient the large diameter end of the driving gear 231 toward the second circuit board 222 so that when the jaw drive assembly 22 is installed in the cartridge body 211, the small diameter end of the driving gear 231 first coincides with the transmission gear 252 in the axial direction, facilitating the meshing connection of the transmission gear 252 and the driving gear 231. It will be appreciated that the driven gear 7 is also a bevel gear if a driven gear 253 is also provided in this embodiment.

In addition, the driving gear 231 of the present embodiment can be rotated by an external force in a power-off state of the push-pull box motor 221. In a special situation (such as a situation that the injector 200 needs to be taken down emergently or power failure), since the driving gear 231 can be driven to rotate by external force when the cartridge pushing and pulling motor 221 is in a power-off state, the cartridge pushing and pulling motor 221 does not influence the rotation of the driving gear 231, the two jaw clamps 251 can be directly and manually opened, and the transmission gear 252 rotates and drives the driving gear 231 to rotate in the process of opening the two jaw clamps 251. That is, the claw grip 251 reversely drives the transmission gear 252, the driving gear 231, and the cartridge push-pull motor 221 to rotate, and the transmission gear 252 and the driving gear 231 do not have a self-locking state. Through the arrangement, the claw clamp 251 can be directly and manually opened under special conditions to complete the separation and unlocking operation of the claw clamp mechanism 25 on the piston handle of the injector 200, so that the operation is convenient and the unlocking time is shortened; in addition, an unlocking structure is not required to be independently arranged, the volume of the push-pull box assembly 20 is effectively reduced, and the structure of the injection pump 100 is simplified.

Referring to fig. 4 and 12, the hollow shaft 13 ' of the present embodiment includes a shaft body 131 ' having a mounting channel 13 ' a, and a sleeve 132 ' sleeved in the shaft body 131 ', wherein the sleeve 132 ' divides the mounting channel 13 ' a into a first sub-channel 13 ' b and a second sub-channel 13 ' c. The syringe pump 100 also includes a cable 40 and a main board (not shown). The screw rod 141 is inserted into the first sub-channel 13 'b, the cable 40 is inserted into the second sub-channel 13' c, and the push-pull box assembly 20 is connected to the main board through the cable 40.

Specifically, in the use process of the syringe pump 100 of the present embodiment, a corresponding signal needs to be transmitted between the push-pull box assembly 20 and the main board, for example, the main board needs to transmit a control signal to the push-pull box motor 221 to control the opening and closing of the claw holder 251; during the injection process, the pressure sensor assembly 27 arranged in the box body 21 can detect the pressure in the syringe 200 and transmit the detection signal to the main board, and the push-pull box assembly 20 is electrically connected with the main board through the cable 40, so that the transmission of the control signal, the detection signal and the like can be realized. Since the hollow shaft 13 ' of the present embodiment is sleeved outside the screw rod 141, and the cable 40 passes through the hollow shaft 13 ', a sleeve 132 ' is further disposed in the hollow shaft 13 ', the sleeve 132 ' is sleeved in the shaft body 131 ', the screw rod 141 is inserted in the first sub-channel 13 ' b, and the cable 40 is inserted in the second sub-channel 13 ' c, that is, the cable 40 and the screw rod 141 can be separated by the sleeve 132 ', so as to prevent the cable 40 from being damaged during the high-speed rotation of the screw rod 141. Those skilled in the art should understand that the motherboard can use various existing chips with signal input and signal output as the control device, and can use an electrical signal control mode or a software control mode to control, and the cable 40 can be a Flexible Flat Cable (FFC) or other cables capable of transmitting electrical signals.

Referring to fig. 1 to 15, a syringe pump 100 according to one embodiment of the present application includes: a push-pull box assembly 20 and a pump body arrangement 10. The pump body device 10 includes: seat 11, transmission assembly 14, sliding assembly 12, connecting shaft 13 and actuating mechanism 15. The transmission assembly 14 includes a screw 141, a nut 142 screwed with the screw 141, and a gear mechanism 143 fixedly connected with the screw 141. The screw rod 141 has a spiral groove 141a having a double circular arc shape in a normal cross-sectional shape, the nut 142 has a spiral tooth 142a fitted to the spiral groove 141a, and the thread shape of the spiral tooth 142a is semicircular. The sliding assembly 12 includes two guide rods 121 ' spaced in parallel on the seat body 11, and a slider 122 ' passing through the two guide rods 121 '. The slider 122 'is formed with a third mounting hole 122' c penetrating the slider 122 ', and the nut 142 is detachably disposed in the third mounting hole 122' c. The connecting shaft 13 is a hollow shaft 13 ', and the hollow shaft 13 ' has a mounting channel 13 ' a extending in the axial direction. The hollow shaft 13 'is arranged between the two guide rods 121', one end of the hollow shaft 13 'is connected with the sliding block 122', and the end of the hollow shaft 13 'far away from the sliding block 122' is connected with the push-pull box assembly 20. The screw rod 141 is inserted into the installation passage 13' a. The drive mechanism 15 is drivingly connected to the gear mechanism 143. By the driving of the driving mechanism 15, the transmission assembly 14 converts the rotation of the lead screw 141 into the linear motion of the slider 122 ', so that the slider 122 ' drives the push-pull box assembly 20 connected to the hollow shaft 13 ' to reciprocate relative to the base 11.

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 (10)

1. A pump body assembly for a syringe pump for connection to a push-pull cassette assembly of said syringe pump, comprising:

a base body;

the transmission assembly comprises a screw rod and a nut in threaded connection with the screw rod, the screw rod is provided with a spiral groove with an arc-shaped normal cross section, and the nut is provided with spiral teeth matched with the spiral groove;

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; the screw nut is arranged on the second sliding piece;

the connecting shaft is connected with the second sliding piece and the push-pull box assembly;

the driving mechanism is in driving connection with the transmission assembly; through the driving of the driving mechanism, the transmission assembly converts the rotary motion of the screw rod into the linear motion of the second sliding piece, so that the second sliding piece drives the push-pull box assembly connected with the connecting shaft to reciprocate relative to the base body.

2. The pump body apparatus according to claim 1, wherein a normal sectional shape of the spiral groove is a single circular arc, a double circular arc or an ellipse.

3. The pump body device according to claim 1 or 2, characterized in that the profile of the helical teeth is semicircular.

4. The pump body device according to claim 1 or 2, characterized in that the spiral groove has a contact angle of 45 ° with the spiral tooth.

5. The pump body device according to claim 1 or 2, wherein the second slider has a third mounting hole formed therethrough;

the nut is detachably arranged in the third mounting hole.

6. The pump body apparatus according to claim 1 or 2, wherein the second slider and the nut are integrally formed.

7. The pump body apparatus according to claim 1 or 2, wherein the transmission assembly further comprises two bearings adjacently disposed on the housing body;

one end of the screw rod, which is in driving connection with the driving mechanism, penetrates through the two bearings, and the end, which is far away from the bearings, of the screw rod is a free end.

8. The pump body device according to claim 1 or 2, characterized in that the connecting shaft is a hollow shaft having an axially extending mounting channel in which the screw rod is inserted.

9. A syringe pump, comprising: a push-pull cassette assembly and a pump body arrangement according to any one of claims 1-8; the push-pull box assembly is connected with the connecting shaft.

10. A syringe pump, comprising:

a push-pull box assembly;

a pump body device, the pump body device comprising: the device comprises a base body, a transmission assembly, a sliding assembly, a connecting shaft and a driving mechanism; the transmission assembly comprises a screw rod, a nut and a gear mechanism, the screw rod is in threaded connection with the screw rod, the gear mechanism is fixedly connected with the screw rod, the screw rod is provided with a spiral groove, the shape of the normal cross section of the spiral groove is double circular arc, the nut is provided with spiral teeth matched with the spiral groove, and the tooth form of the spiral teeth is semicircular; 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; a third mounting hole penetrating through the sliding block is formed in the sliding block; the nut is detachably arranged in the third mounting hole; the connecting shaft is a hollow shaft, and the hollow shaft is provided with an installation channel extending along the axial direction; 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 screw rod penetrates through the installation channel; the driving mechanism is in driving connection with the gear mechanism; through the driving of the driving mechanism, the transmission assembly converts the rotary motion of the screw rod into the linear motion of the slide block, so that the slide block drives the push-pull box assembly connected with the hollow shaft to reciprocate relative to the base body.

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