CN220158915U - Heparin pump - Google Patents

Abstract

The utility model provides a heparin pump, and belongs to the technical field of medical appliances. The quick-forward and quick-backward heparin pump solves the problem that an existing heparin pump cannot be manually and mechanically fast-forward and quick-backward. The device comprises a supporting frame, a screw rod arranged on the supporting frame and a motor for driving the screw rod to rotate, wherein the supporting frame is arranged on a needle tube seat for installing an injector, a push rod capable of axially moving is arranged in the needle tube seat in a penetrating mode, one end of the push rod is provided with a connecting structure for being in threaded connection with the screw rod, the other end of the push rod is provided with a clamping structure for clamping a piston rod of the injector, the device further comprises an unlocking structure, and when the unlocking structure is in an unlocking state, the connecting structure is separated from threaded connection with the screw rod. The utility model realizes the fast forward and fast backward functions of manual and manual machinery and has the advantages of simple structure, convenient operation and strong operability.

Description

Heparin pump

Technical Field

The utility model belongs to the technical field of medical appliances, and relates to a heparin pump, in particular to a heparin pump for a hemodialysis instrument.

Background

Heparin pumps are devices that provide stable power for anticoagulants during treatment, and are used in clinical applications as microinjection pumps to continuously inject heparin into the patient's blood. Coagulation is easily caused by the contact of the extracorporeal circulation with air during hemodialysis, while coagulation is prevented by using a heparin pump. Heparin is a common clinical anticoagulant, and can prevent blood from solidifying in the outer tube of the dialyzer.

For example, in chinese patent publication No. CN202961316U, a heparin pump is disclosed comprising: a housing; a housing fixed in the housing; a stepping motor arranged on a motor mounting plate of the frame and a control circuit board thereof; one end of the screw rod is directly connected with a driving shaft of the stepping motor, and the other end of the screw rod is in supporting connection with the supporting sleeve; the screw rod nut is in threaded connection with the screw rod and is fixed on the nut connecting block; a guide rail fixed on a side plate of the frame and a slider connecting block arranged on the guide rail; the nut connecting block compresses a spring with a preset pressure in an inner hole of the sliding block connecting block through the axial check ring, and one end of the sliding block connecting block is fixedly connected with a push rod for directly pushing a syringe matched with the heparin pump.

In the structure of the heparin pump, the screw nut and the nut connecting block are rigidly fixed, and the fast-forward and fast-backward functions of the syringe piston rod are controlled by controlling the rotating speed of the motor, so that the mechanical fast-forward and fast-backward functions of the syringe piston rod can not be realized manually.

Disclosure of Invention

The utility model aims at solving the problems in the prior art and provides a heparin pump with manual mechanical fast-forward and fast-backward functions.

The aim of the utility model can be achieved by the following technical scheme:

heparin pump, including the support frame, locate lead screw on the support frame and be used for the drive lead screw pivoted motor, locate on the support frame and be used for installing the needle tubing seat of syringe, wear to be equipped with axial movement's push rod in the needle tubing seat, the one end of push rod is equipped with the connection structure who is used for with lead screw threaded connection, the other end of push rod is equipped with the clamping structure who is used for the centre gripping syringe piston rod, still includes the unblock structure, when the unblock structure is in the unblock state, connection structure break away from with the threaded connection of lead screw.

The output end of the motor is in transmission connection with a screw rod on the support frame, the motor drives the screw rod to reciprocate on the support frame, the connecting structure in threaded connection with the screw rod drives the push rod to synchronously move left and right, and the left and right movement of the push rod drives a piston rod of the injector to move left and right, so that the injection of the heparin pump is realized. When the unlocking structure is in an unlocking state, the connecting structure and the screw rod are in a separation state, at the moment, the motor drives the screw rod to rotate, the screw rod can not drive the connecting structure, the push rod and the clamping structure to push the piston rod of the injector, and therefore the piston rod of the injector can be manually subjected to a fast-forward or fast-backward function.

In the heparin pump, the connecting structure comprises a sliding sleeve arranged at one end of the push rod, a sliding block connected to one end, far away from the push rod, of the sliding sleeve, a spring and an opening and closing nut arranged in the sliding block, and the opening and closing nut is in threaded connection with the screw rod under the action of the spring.

When the opening and closing nut is in threaded connection with the screw rod, the screw rod is rotated to drive the opening and closing nut to axially move along the screw rod, so that the sliding block, the sliding sleeve and the push rod are driven to axially move along the screw rod, and the movement of the piston rod is realized.

In the heparin pump, a guide hole extending along the length direction of the sliding sleeve is arranged in the sliding block, and the opening and closing nut is in sliding fit in the guide hole; the opening and closing nut is internally provided with a perforation with caliber larger than the outer diameter of the screw rod, the screw rod is arranged in the perforation in a penetrating way, and one side of the perforation is provided with an internal thread matched with the screw rod in a threaded way; one end of the spring acts on the sliding block, and the other end of the spring acts on the split nut.

The size of the guide hole is in shape with the size of the opening and closing nut, the opening and closing nut can move in the guide hole, and the moving direction of the opening and closing nut is perpendicular to the length direction of the screw rod; the guide hole is provided with a compression spring, and the opening and closing nut has a trend of moving towards the screw rod under the action of the spring. When the unlocking structure is in an unlocking state, the spring in the guide hole is in a compression state under the action of the unlocking structure, the split nut and the screw rod are in a separation state, the split nut cannot be driven to move when the screw rod rotates, the screw rod cannot be driven to rotate when the split nut moves, and the split nut cannot be blocked by the screw rod when moving. When the unlocking structure is in a non-unlocking state, the opening and closing nut is in threaded connection with the screw rod, and the spring is in a normal state.

In the heparin pump, the unlocking structure comprises a rotating rod arranged in the push rod, a push rod arranged in the sliding sleeve in a sliding mode and a cam arranged at one end of the rotating rod, one end, away from the split nut, of the push rod abuts against the outer circle of the cam, and one end, away from the cam, of the rotating rod is provided with a handle.

When the handle is rotated, the handle and the rotating rod in the push rod synchronously rotate to drive the cam at the other end of the rotating rod to rotate, when the cam rotates, the protruding part on the cam gradually abuts against the ejector rod, and the ejector rod vertically moves upwards to jack up the split nut, so that the split nut is separated from threaded fit with the screw rod.

In the heparin pump, the clamping structure comprises a clamping seat fixedly connected to one end, far away from the sliding sleeve, of the push rod, a first clamping jaw and a second clamping jaw hinged to the clamping seat, and a tension spring used for enabling the clamping end of the first clamping jaw to be close to the clamping end of the second clamping jaw is arranged on the clamping.

One end of the tension spring is fixedly connected with the clamping seat, the other end of the tension spring acts on the first clamping jaw/the second clamping jaw, for example, the other end of the tension spring acts on the first clamping jaw, and the clamping end of the first clamping jaw and the clamping end of the second clamping jaw have a trend of approaching together under the action of the tension spring.

In the heparin pump, a first gear is coaxially and fixedly connected to a hinge shaft of the first clamping jaw hinged to the clamping seat, a second gear is coaxially and fixedly connected to a hinge shaft of the second clamping jaw hinged to the clamping seat, and the first gear is meshed with the second gear. When the clamping end of the first clamping jaw/the second clamping jaw moves towards the clamping end of the second clamping jaw/the first clamping jaw under the action of the tension spring, the clamping end of the second clamping jaw/the first clamping jaw can move towards the clamping end of the first clamping jaw/the second clamping jaw through the first gear and the second gear.

In the heparin pump, a third gear is coaxially and fixedly connected to the rotating rod and meshed with the first gear/the second gear.

The handle is rotated, the rotating rod is driven to rotate, the third gear is driven to rotate, the first gear/the second gear is driven to rotate when the third gear rotates, the first gear is meshed with the second gear, the first gear and the second gear rotate in a reverse synchronous mode, the first clamping jaw and the second clamping jaw are opened, and clamping of a piston rod of the syringe is released.

In addition, a structure for limiting the handle is further arranged on the clamping seat (such as a limiting groove arranged on the clamping seat, the handle is arranged in the limiting groove, the handle is always attached to one side of the limiting groove under the action of the tension spring), when an external force acts on the handle, the handle is enabled to rotate according to a set direction, and when the handle rotates according to the direction, a third gear on the rotating rod is driven to rotate on one hand, and meanwhile the third gear is meshed with the first gear/the second gear, so that the first clamping jaw and the second clamping jaw are opened; on the other hand, the rotation of the rotating rod drives the cam to rotate, so that the opening and closing nut in the sliding block is separated from threaded connection with the screw rod. After the handle is loosened, the handle can be reset under the action of the tension spring.

In the heparin pump, the support frame is also provided with a guide rod which is in sliding fit with the sliding block. The guide rod is parallel to the screw rod, so that the moving stability of the sliding block, the sliding sleeve and the push rod is ensured.

Compared with the prior art, the heparin pump has the following advantages: 1. the handle is rotated, the opening and closing nut is separated from threaded connection with the screw rod, and meanwhile, the first clamping jaw and the second clamping jaw are opened, so that the manual mechanical fast-forward and fast-backward functions can be realized; 2. simple structure and stable mechanical motion transmission.

Drawings

Fig. 1 is a cross-sectional view of a heparin pump provided by the present utility model.

Fig. 2 is a schematic structural view of a clamping structure in a heparin pump provided by the utility model.

Fig. 3 is a schematic diagram of the structure of the heparin pump provided by the utility model.

In the figure, 1, a supporting frame; 2. a screw rod; 3. a motor; 4. a needle holder; 5. a push rod; 6. a sliding sleeve; 7. a slide block; 8. a spring; 9. opening and closing the nut; 10. a rotating rod; 11. a handle; 12. a cam; 13. a push rod; 14. a clamping seat; 15. a guide rod; 16. a first jaw; 17. a second jaw; 18. a tension spring; 19. a first gear; 20. a second gear; 21. a motor mounting plate; 22. a first synchronizing wheel; 23. a second synchronizing wheel; 24. a synchronous belt; 25. a syringe; 26. and (3) a bearing.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

The heparin pump shown in fig. 1 comprises a support frame 1, a guide rod 15 arranged on the support frame 1 and a screw rod 2 arranged on the support frame 1; the support frame 1 is also provided with a motor 1 for driving the screw rod 2 to rotate. The guide rod 15 is parallel to the screw rod 2, and the guide rod 2 is provided with a sliding block 7 in sliding fit with the guide rod 2.

As shown in fig. 1, a motor mounting plate 21 is arranged on a support frame 1, and a motor 3 is mounted on the motor mounting plate 21; the output end of the motor 3 is provided with a first synchronizing wheel 22, the screw rod 2 is coaxially provided with a second synchronizing wheel 23, and the first synchronizing wheel 22 is in transmission connection with the second synchronizing wheel 23 through a synchronizing belt 24. When the motor 3 starts to work, the motor 3 drives the first synchronous wheel 22 to operate, and drives the second synchronous wheel 23 to operate through the synchronous belt 24, so that the screw rod 2 is driven to rotate. In order to facilitate the rotation of the screw rod 2, bearings 26 are mounted at both ends of the screw rod 2, and both bearings 26 are fixed on the support frame 1.

As shown in fig. 1, the supporting frame 1 is further provided with a needle tube seat 4 for installing the injector 25, the needle tube seat 4 is located below the supporting frame 1, the injector 25 is installed below the needle tube seat 4, a push rod 5 parallel to the screw rod 2 is arranged in the needle tube seat 4 in a penetrating manner, one end of the push rod 5 is provided with a clamping structure for clamping a piston rod of the injector 25, the other end of the push rod 5 is provided with a connecting structure in threaded connection with the screw rod 2, and an unlocking structure for separating the connecting structure from the threaded connection of the screw rod 2 is further arranged in the push rod 5 and the sliding sleeve 6.

The needle holder 4 is provided with a fixing mechanism for fixing the syringe 25, and the fixing mechanism in this embodiment is an elastic clamping holder arranged on the needle holder 4, so that the syringe 25 is clamped in the elastic clamping holder.

A piston rod is arranged in the injector 25, the piston rod of the injector 25 is parallel to the push rod 5, one end of the push rod 5 away from the connecting structure is connected with the clamping structure, and the piston rod of the injector 25 is connected with the clamping structure.

As shown in fig. 2, the clamping structure comprises a clamping seat 14 fixedly connected to one end of the push rod 5 far away from the connecting structure, and a first clamping jaw 16 and a second clamping jaw 17 hinged on the clamping seat 14, wherein a tension spring 18 for closing the clamping end of the first clamping jaw 16 and the clamping end of the second clamping jaw 17 is further arranged on the clamping seat 14. In this embodiment, as shown in fig. 2, one end of the tension spring 18 is fixedly connected with the clamping seat 14, the other end acts on the second clamping jaw 17, and under the action of the tension spring 18, the clamping end of the first clamping jaw 16 and the clamping end of the second clamping jaw 17 have a tendency to be close.

In addition, as shown in fig. 2, a first gear 19 is coaxially and fixedly connected to the hinge shaft where the first clamping jaw 16 is hinged to the clamping seat 14, a second gear 20 is coaxially and fixedly connected to the hinge shaft where the second clamping jaw 17 is hinged to the clamping seat 14, the first gear 19 is meshed with the second gear 20, and a third gear is coaxially and fixedly connected to the rotating rod 10, and in this embodiment, the third gear is meshed with the first gear 19. When the rotating rod 10 rotates, the third gear is driven to synchronously rotate, the first gear 19 is driven to rotate when the third gear rotates, and the first gear 19 and the second gear 20 are meshed with each other, so that the first clamping jaw 16 and the second clamping jaw 17 are opened, clamping of a piston rod of the injector 25 is released, at the moment, the injector 25 can be replaced, and the fast-forward and fast-backward functions of the sliding block 7 can be realized.

In other embodiments, the third gear meshes with the second gear 20. When the rotating rod 10 rotates, the third gear is driven to synchronously rotate, the second gear 20 is driven to rotate when the third gear rotates, and the second gear 20 and the first gear 19 rotate mutually, so that the first clamping jaw 16 and the second clamping jaw 17 are opened, clamping of a piston rod of the injector 25 is released, at the moment, the injector 25 can be replaced, and the fast-forward and fast-backward functions of the sliding block 7 can be realized.

In order to facilitate the rotation of the rotating rod, a handle 11 for rotating the rotating rod 10 is arranged on the rotating rod 10, a limiting groove for limiting the handle 11 is arranged on the clamping seat 14, the handle 11 is arranged in the limiting groove, and in the embodiment, the handle 11 is always abutted against one side of the limiting groove under the action of the tension spring 18.

In the present embodiment, when an external force acts on the handle 11, the handle 11 rotates around the axis of the rotating rod 10 at a side far away from the limit groove, and when the handle 11 rotates in the direction, on one hand, the third gear on the rotating rod 10 is driven to rotate, and simultaneously, the third gear is meshed with the first gear 19, the first gear 19 is meshed with the second gear 20, so that the first clamping jaw 16 and the second clamping jaw 17 are opened, the clamping of the piston rod of the injector 25 is released, and the tension spring 18 is in a stretched state; on the other hand, the handle 11 rotates synchronously with the rotating rod 10 in the push rod 5, so that the connecting structure on the push rod 5 is driven to be disconnected with the screw thread of the screw rod 2. After the handle 11 is released, the clamping end of the second clamping jaw 17 is closed to the clamping end of the first clamping jaw 16 under the action of the spring force by the tension spring 18, and meanwhile, the third gear and the rotating rod 10 rotate together to reset the handle 11.

As shown in fig. 1, the connecting structure comprises a sliding sleeve 6 arranged at one end of the push rod 5, a sliding block 7 connected to one end of the sliding sleeve 6 far away from the push rod 5, and a spring 8 and a split nut 9 arranged in the sliding block 7.

In this embodiment, the slider 7 is fixedly connected above the sliding sleeve 6, and at the same time, the slider 7 is slidingly engaged on the guide rod 15.

A guide hole extending along the length direction of the sliding sleeve 6 is arranged in the sliding block 7, the size of the guide hole is adapted to that of the opening and closing nut 9, and the opening and closing nut 9 is in sliding fit in the guide hole; a spring 8 is arranged in the guide hole, one end (upper end) of the spring 8 is abutted against the upper end of the guide hole, and the other end (lower end) of the spring 8 is abutted against the opening and closing nut 9; the opening and closing nut 9 has a tendency to move downwards under the action of the spring 8.

When the open-close nut 9 is in threaded connection with the screw rod 2, the screw rod 2 rotates to drive the open-close nut 9 to axially move along the screw rod 2, so that the sliding block 7 is driven to horizontally move on the guide rod 15, the sliding sleeve 6 fixedly connected with the sliding block 7, the push rod 5 connected with the sliding sleeve 6 and the clamping assembly connected with the push rod 5 are driven to horizontally move, and the clamping assembly clamps the piston rod of the injector 25, so that the telescopic movement of the piston rod of the injector 25 is realized.

The unlocking structure comprises a rotating rod 10 arranged in the push rod 5, a push rod 13 arranged in the sliding sleeve 6 in a sliding manner and a cam 12 arranged at one end of the rotating rod 10, wherein one end (lower end) of the push rod 13 away from the split nut 9 is abutted against the excircle of the cam 12.

In this embodiment, one end of the rotating rod 10 is connected with the handle 11 on the clamping seat 14, the other end of the rotating rod 10 is connected with the cam 12, and when the cam 12 rotates, the protruding part of the cam can abut against the lower end of the ejector rod 13, so that the ejector rod 13 can lift up and down, and the upper end of the ejector rod 13 abuts against the split nut 9.

When the handle 11 is rotated, on one hand, the handle 11 and the rotating rod 10 in the push rod 5 synchronously rotate, the cam 12 at the other end of the rotating rod 10 is driven to rotate, when the cam 12 rotates, the protruding part on the cam gradually abuts against the ejector rod 13, the ejector rod 13 vertically moves upwards along the sliding sleeve 6 under the action of the cam 12, the upper part of the ejector rod 13 abuts against the open-close nut 9, the open-close nut 9 moves upwards, the open-close nut 9 is separated from threaded connection with the screw rod 2, and at the moment, the spring 8 abutting against the open-close nut 9 in the sliding block 7 is in a compressed state. On the other hand, when the rotating rod 10 rotates, the third gear is driven to rotate synchronously, the third gear drives the first gear 19 to rotate when rotating, and the first gear 19 and the second gear 20 rotate mutually, so that the first clamping jaw 16 and the second clamping jaw 17 are opened, the tension spring 18 is in a stretching state, and the clamping of the piston rod of the injector 25 is released.

In other embodiments, the third gear meshes with the second gear 20. When the rotating rod 10 rotates, the third gear is driven to synchronously rotate, the second gear 20 is driven to rotate when the third gear rotates, and the second gear 20 and the first gear 19 rotate mutually, so that the first clamping jaw 16 and the second clamping jaw 17 are opened, the tension spring 18 is in a stretching state, and the clamping of the piston rod of the injector 25 is released.

When the handle 11 is released, under the action of the tension spring 18, the clamping end of the second clamping jaw 17 is closed to the clamping end of the first clamping jaw 16, the second gear 20 on the second clamping jaw 17 drives the first gear 19 on the first clamping jaw 16 to be meshed, the first gear 19 drives the third gear to be meshed, and the third gear and the rotating rod 10 rotate together, so that the handle 11 is reset.

Simultaneously, the rotation of the rotating rod 10 enables the protruding part of the cam 12 to gradually separate from the bottom of the ejector rod 13, the ejector rod 13 moves vertically downwards, the opening and closing nut 9 connected with the ejector rod 13 and sliding in the guide hole of the sliding block 7 moves downwards under the action of the spring 8, and the opening and closing nut 9 is in threaded connection with the screw rod 2.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims (8)

1. The utility model provides a heparin pump, its characterized in that includes support frame (1), locates lead screw (2) on support frame (1) and is used for driving lead screw (2) pivoted motor (3), locate on support frame (1) and be used for installing needle tube seat (4) of syringe, wear to be equipped with but axial movement's push rod (5) in needle tube seat (4), the one end of push rod (5) is equipped with the connection structure who is used for with lead screw (2) threaded connection, the other end of push rod (5) is equipped with the clamping structure who is used for the piston rod of centre gripping syringe (25), still includes the unblock structure, when the unblock structure is in the unblock state, connection structure break away from with threaded connection of lead screw (2).

2. Heparin pump according to claim 1, characterized in that the connection structure comprises a sliding sleeve (6) arranged at one end of the push rod (5), a sliding block (7) connected to one end of the sliding sleeve (6) far away from the push rod (5), a spring (8) and an opening and closing nut (9) arranged in the sliding block (7), and the opening and closing nut (9) is in threaded connection with the screw rod (2) under the action of the spring (8).

3. Heparin pump according to claim 2, characterized in that the slide block (7) is provided with a guide hole extending along the length direction of the slide sleeve (6), and the opening and closing nut (9) is in sliding fit in the guide hole; the opening and closing nut (9) is internally provided with a perforation with caliber larger than the outer diameter of the screw rod (2), the screw rod (2) is arranged in the perforation in a penetrating way, and one side of the perforation is provided with an internal thread matched with the screw rod in a threaded way; one end of the spring (8) acts on the sliding block (7), and the other end of the spring (8) acts on the split nut (9).

4. Heparin pump according to claim 1, characterized in that the unlocking structure comprises a rotating rod (10) arranged in the push rod (5), a push rod (13) arranged in the sliding sleeve (6) in a sliding manner, and a cam (12) arranged at one end of the rotating rod (10), wherein one end of the push rod (13) away from the split nut (9) is abutted against the outer circle of the cam (12), and one end of the rotating rod (10) away from the cam (12) is provided with a handle (11).

5. Heparin pump according to claim 1, characterized in that the clamping structure comprises a clamping seat (14) fixedly connected to one end of the push rod (5) far away from the sliding sleeve (6), a first clamping jaw (16) and a second clamping jaw (17) hinged to the clamping seat (14), and a tension spring (18) for bringing the clamping end of the first clamping jaw (16) close to the clamping end of the second clamping jaw (17) is arranged on the clamping seat (14).

6. Heparin pump according to claim 5, wherein a first gear (19) is coaxially and fixedly connected to a hinge shaft of the first clamping jaw (16) hinged to the clamping seat (14), a second gear (20) is coaxially and fixedly connected to a hinge shaft of the second clamping jaw (17) hinged to the clamping seat (14), and the first gear (19) is meshed with the second gear (20).

7. Heparin pump according to claim 4, characterized in that a third gear is coaxially and fixedly connected to the turning rod (10), which third gear meshes with the first gear (19)/the second gear (20).

8. A heparin pump as claimed in claim 3, characterized in that the support frame (1) is further provided with a guide rod (15) in sliding fit with the slide block (7).