An infusion pump with a novel cam-driven mechanism

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By introducing a novel cam-driven mechanism into the infusion pump, which uses the first and second cams to push the pump blades alternately, the high cost and maintenance difficulties caused by the complex structure of existing infusion pumps are solved, achieving high-efficiency output and simplified maintenance of the infusion pump.

CN224506005UActive Publication Date: 2026-07-17SHENZHEN MEDRENA BIOTECH CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: SHENZHEN MEDRENA BIOTECH CO LTD
Filing Date: 2025-08-15
Publication Date: 2026-07-17

AI Technical Summary

Technical Problem

Existing infusion pumps have complex structures, resulting in high production costs and time-consuming and labor-intensive maintenance.

Method used

An infusion pump with a novel cam-driven mechanism includes a pump housing, a drive shaft, pump blades, a first cam, and a second cam. The first and second cams alternately push the pump blades to achieve regular compression of the infusion tubing. The pump blades are an integrated structure, which simplifies the structure, reduces manufacturing costs, and facilitates maintenance.

Benefits of technology

It achieves good linearity in the output power of the infusion pump, reduces pulsation, lowers production costs, and facilitates later maintenance.

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Abstract

This utility model relates to the field of infusion pump technology and proposes an infusion pump with a novel cam-driven mechanism. The pump includes a pump housing with an inner cavity and an outlet, the outlet communicating with the inner cavity. A drive shaft passes through the inner cavity, with both ends extending outside the pump housing; the drive shaft and pump housing are rotatably connected. Several pump blades are located within the inner cavity, each having a receiving portion and a pushing top. The drive shaft passes through the receiving portion, and the pushing tops reciprocate in and out of the outlet to compress the infusion tubing. A first cam is sleeved on the drive shaft and located on the receiving portion of the pump blades. A second cam is sleeved on the drive shaft and located on the receiving portion of the pump blades. The first and second cams are spaced apart, and they alternately push the corresponding pump blades to subject the infusion tubing to regular compression. This technical solution solves the problem of time-consuming and labor-intensive maintenance of existing infusion pumps due to their complex internal structure.

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Description

Technical Field

[0001] This utility model relates to the field of infusion pump technology, specifically to an infusion pump with a novel cam-driven mechanism. Background Technology

[0002] An infusion pump is a sophisticated infusion device widely used in the medical field. The working principle of an infusion pump is as follows: a stepper motor drives a camshaft to rotate, causing a slider to move up and down in a rhythmic pattern, sequentially squeezing the intravenous infusion tubing like a wave, thus causing the fluid in the tubing to flow in a specific direction at a certain speed. However, existing infusion pumps are relatively complex in structure, resulting in high production costs and requiring time and effort for maintenance.

[0003] Therefore, a new infusion pump is urgently needed. Utility Model Content

[0004] This invention proposes an infusion pump with a novel cam-driven mechanism, which solves the problem that the maintenance of existing infusion pumps is time-consuming and labor-intensive due to their complex internal structure.

[0005] The technical solution of this utility model is as follows: an infusion pump with a novel cam-driven mechanism, comprising:

[0006] A pump housing having an inner cavity and an outlet, the outlet communicating with the inner cavity;

[0007] A drive shaft passes through the inner cavity, with both ends of the drive shaft extending out of the pump housing. The drive shaft and the pump housing are rotatably connected.

[0008] The pump blades are multiple and all located in the inner cavity. Each pump blade has a receiving portion and a pusher. The drive shaft passes through the receiving portion, and the pusher reciprocates in and out of the output port and is used to squeeze the infusion tube.

[0009] The first cam is sleeved on the drive shaft and located on the receiving part of the pump blade;

[0010] The second cam is sleeved on the drive shaft and located on the receiving part of the pump blade;

[0011] The number of the first cams plus the number of the second cams equals the number of pump blades, and the first cams and the second cams are spaced apart from each other. The first cams and the second cams take turns pushing the corresponding pump blades so that the infusion tube is subjected to regular compression.

[0012] As a further technical solution, the first cam is provided with a first locking hole, the second cam is provided with a second locking hole, and a pin is provided between any adjacent first cam and second cam, the pin passing through both the first locking hole and the second locking hole.

[0013] As a further technical solution, a plurality of guide protrusions are provided in the inner cavity, the guide protrusions are arranged at equal intervals, and a pump plate is inserted between any two adjacent guide protrusions.

[0014] As a further technical solution, the cross-section of the portion of the drive shaft that contacts the first cam and the second cam is hexagonal.

[0015] As a further technical solution, a wear-resistant plate is also included, which is disposed in the receiving groove of the pump plate. One side of the wear-resistant plate contacts the inner wall of the receiving groove, and the other side contacts the outer edge of the first cam or the second cam.

[0016] As a further technical solution, the end of the pump blade that contacts the infusion tube is semi-cylindrical.

[0017] As a further technical solution, the receiving portion of the pump plate is a square groove with an opening on one side.

[0018] As a further technical solution, a bearing is also included, wherein the pump housing has a groove, the bearing is placed in the groove, and the drive shaft passes through the bearing.

[0019] As a further technical solution, there are two bearings and two corresponding slots, with the two bearings located at the two ends of the transmission shaft.

[0020] The working principle and beneficial effects of this utility model are as follows: An infusion pump with a novel cam-driven mechanism includes a pump housing, a drive shaft, pump blades, a first cam, and a second cam. The pump casing has an inner cavity and an outlet, with the outlet connected to the inner cavity. The pump blades, the first cam, and the second cam are all located within the inner cavity. A drive shaft passes through the pump casing, with both ends protruding from the inner cavity. The first cam and the second cam are both mounted on the drive shaft, and rotation of the drive shaft causes the first and second cams to rotate as well. The pump blades are located within the inner cavity and have a receiving portion and a pushing top. The drive shaft passes through the receiving portions of all pump blades. The first and second cams are located within the receiving portions, and the total number of first and second cams is the same as the number of pump blades. Under the action of the first and second cams, the pushing tops can enter and exit the outlet. The first and second cams are spaced apart, i.e., in a first cam-second cam-first cam-second cam configuration. This configuration allows the pushing tops of the corresponding pump blades to regularly enter and exit the outlet of the pump casing, thereby achieving regular pressure on the infusion tube. Due to the large number of pump blades, the output power of the infusion pump has good linearity, and pulsation is not easily generated during infusion. Furthermore, since the pump plate is an integrated structure, the first and second cams only need to drive the pump plate to move to complete the power output of the infusion pump. Moreover, the inlet and outlet of the pump plate are both completed by the first and second cams. Therefore, the structure has been effectively simplified, which not only reduces the manufacturing cost but also facilitates later maintenance. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 A schematic diagram of the structure of the infusion pump with a novel cam-driven mechanism provided by this utility model;

[0023] Figure 2 for Figure 1 Front view;

[0024] Figure 3 for Figure 1 The diagram shows the structure behind a portion of the pump casing that is hidden.

[0025] Figure 4 for Figure 3 A structural diagram from another angle;

[0026] Figure 5 for Figure 1 A structural diagram showing the pump casing after it has been completely concealed;

[0027] Figure 6 for Figure 5 A structural diagram from another angle;

[0028] Figure 7 for Figure 5 A schematic diagram showing the structure with some pump plates hidden.

[0029] Figure 8 for Figure 7 A schematic diagram showing the structure with the pump plates and wear-resistant plates hidden.

[0030] Figure 9 for Figure 8 A structural diagram showing the first cam hidden;

[0031] Figure 10 A schematic diagram of the structure of the first cam provided by this utility model;

[0032] Figure 11 A schematic diagram of the structure of the second cam provided by this utility model;

[0033] Figure 12 A schematic diagram of the pump casing structure provided by this utility model.

[0034] In the diagram: 1. Pump housing; 2. Drive shaft; 3. Pump blades; 4. First cam; 5. Second cam; 6. Pin; 7. Guide protrusion; 8. Wear-resistant plate; 9. Bearing. Detailed Implementation

[0035] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0036] like Figures 1 to 11 As shown, this embodiment proposes an infusion pump with a novel cam-driven mechanism, comprising:

[0037] Pump casing 1 has an inner cavity and an outlet, with the outlet communicating with the inner cavity;

[0038] The drive shaft 2 is inserted into the inner cavity, and both ends of the drive shaft 2 extend out of the pump housing 1. The drive shaft 2 and the pump housing 1 are rotatably connected.

[0039] Pump blades 3, which are several and all located in the inner cavity, have a receiving part and a pusher. The drive shaft 2 passes through the receiving part, and the pusher reciprocates in and out of the output port and is used to squeeze the infusion tube.

[0040] The first cam 4 is sleeved on the drive shaft 2 and located on the receiving part of the pump plate 3;

[0041] The second cam 5 is sleeved on the drive shaft 2 and located on the receiving part of the pump plate 3;

[0042] The number of first cams 4 plus the number of second cams 5 equals the number of pump plates 3. The first cams 4 and the second cams 5 are spaced apart from each other. The first cams 4 and the second cams 5 take turns pushing the corresponding pump plates 3 so that the infusion tube is subjected to regular compression.

[0043] In this embodiment, an infusion pump with a novel cam-driven mechanism includes a pump housing 1, a drive shaft 2, pump blades 3, a first cam 4, and a second cam 5. The pump housing 1 has an inner cavity and an outlet, with the outlet communicating with the inner cavity. The pump blades 3, the first cam 4, and the second cam 5 are all located within the inner cavity. The drive shaft 2 passes through the pump housing 1, with both ends protruding from the inner cavity of the pump housing 1. The first cam 4 and the second cam 5 are both mounted on the drive shaft 2. Rotation of the drive shaft 2 causes the first cam 4 and the second cam 5 to rotate. The pump blades 3 are located within the inner cavity and have a receiving portion and a pushing top. The drive shaft 2 passes through the receiving portions of all pump blades 3. The first cam 4 and the second cam 5 are both located within the receiving portions. The total number of wheels 4 and second cams 5 is the same as the number of pump blades 3. Under the action of the first cam 4 and the second cam 5, the pusher can move in and out of the output port. The first cam 4 and the second cam 5 are arranged alternately, that is, in the form of first cam 4-second cam 5-first cam 4-second cam 5. This arrangement allows the pusher of the corresponding pump blade 3 to move in and out of the output port of the pump housing 1 in a regular manner, thereby realizing regular pressing of the infusion tube. Because there are many pump blades 3, the linearity of the output power of the infusion pump is good, and pulsation is not easy to occur during infusion. In addition, since the pump blades 3 are an integrated structure, the first cam 4 and the second cam 5 only need to drive the pump blades 3 to move to complete the power output of the infusion pump. And the movement of the pump blades 3 is completed by the first cam 4 and the second cam 5. Therefore, the structure is effectively simplified, which not only reduces the manufacturing cost, but also facilitates later maintenance.

[0044] The outer edge structure of the first cam 4 is the same as that of the second cam 5, except that the part connected to the connecting shaft is slightly different. In practical applications, the first cam 4 and the second cam 5 are respectively connected to the transmission shaft 2 with hexagonal holes.

[0045] Furthermore, such as Figures 8-11 As shown, this embodiment proposes that a first locking hole is provided on the first cam 4 and a second locking hole is provided on the second cam 5. A pin 6 is provided between any adjacent first cam 4 and second cam 5, and the pin 6 passes through both the first locking hole and the second locking hole.

[0046] In this embodiment, to further improve the stability of the pump plate 3 during output, any adjacent first cam 4 and second cam 5 can be locked. A first locking hole is formed on the first cam 4, and a second locking hole is formed on the second cam 5. Both the first and second locking holes are circular holes, and any adjacent first and second locking holes are completely corresponding. This allows the pin 6 to be inserted into the first and second locking holes. The first cam 4 and second cam 5 can then be locked together via the pin 6. After locking, it can be ensured that the first cam 4 and second cam 5 regularly push the pump plate 3, ultimately improving the regular output of the infusion pump.

[0047] Furthermore, such as Figure 12 As shown, this embodiment proposes that a plurality of guide protrusions 7 are provided in the inner cavity, the guide protrusions 7 are arranged at equal intervals, and a pump plate 3 is inserted between any two adjacent guide protrusions 7.

[0048] In this embodiment, since the pump blade 3 reciprocates within the pump housing 1, in order to improve the stability of the pump blade 3 during the sliding process, a number of guide protrusions 7 are provided on the inner wall of the inner cavity. The guide protrusions 7 are spaced at the same distance. The pump blade 3 slides between two adjacent guide protrusions 7. At this time, there will be no interference or influence between two adjacent pump blades 3.

[0049] Furthermore, such as Figure 7 As shown, this embodiment also includes a wear-resistant plate 8, which is disposed in the receiving groove of the pump plate 3. One side of the wear-resistant plate 8 contacts the inner wall of the receiving groove, and the other side contacts the outer edge of the first cam 4 or the second cam 5.

[0050] In this embodiment, since the first cam 4 and the second cam 5 need to continuously contact the inner wall of the pump plate 3 receiving groove, in order to avoid excessive wear between the pump plates 3, wear-resistant plates 8 are attached between the inner walls of the pump plate 3 receiving groove. The first cam 4 and the second cam 5 push the pump plate 3 against the infusion tube by pushing the wear-resistant plates 8. This can reduce the wear between the pump plate 3 and the first cam 4 or the second cam 5, which is beneficial to improving the service life of the product.

[0051] Furthermore, such as Figures 5-6 As shown in the figure, this embodiment proposes that the end of the pump plate 3 that contacts the infusion tube is semi-cylindrical.

[0052] In this embodiment, in order to reduce wear on the infusion tubing and further improve the output performance of the infusion tubing, the part of the push tip of the pump plate 3 that contacts the infusion tubing is set to be semi-cylindrical.

[0053] Furthermore, such as Figures 5-6 As shown, in this embodiment, the receiving portion of the pump plate 3 is a square groove with an opening on one side.

[0054] In this embodiment, to further simplify the overall structure of the pump plate 3, the receiving portion of the pump plate 3 is set as a square groove with an opening on one side. That is, it is similar to a U-shaped structure with an opening on one side; or the receiving portion is generally U-shaped.

[0055] Furthermore, such as Figures 3-6 As shown, this embodiment also includes a bearing 9, the pump housing 1 has a rotating groove, the bearing 9 is placed in the rotating groove, and the transmission shaft 2 passes through the bearing 9.

[0056] In this embodiment, in order to reduce the frictional force on the drive shaft 2, a bearing 9 is provided between the pump housing 1 and the drive shaft 2. The pump housing 1 has a groove, and the bearing 9 is placed in the groove. The drive shaft 2 passes through the inner ring of the bearing 9, which can reduce the frictional force between the drive shaft 2 and the pump housing 1.

[0057] Furthermore, such as Figures 3-6 As shown, this embodiment proposes that there are two bearings 9 and two corresponding slots, with the two bearings 9 located at the two ends of the transmission shaft 2.

[0058] In this embodiment, bearings 9 are provided at both ends of the transmission shaft 2, and grooves are also provided on both sides of the pump housing 1.

[0059] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An infusion pump with a novel camming mechanism, characterized in that, The utility model relates to a pump, which comprises: a pump shell (1) having an inner cavity and an output port in communication with the inner cavity; a transmission shaft (2) arranged in the inner cavity and having two ends protruding out of the pump shell (1), the transmission shaft (2) being rotatably connected to the pump shell (1); a plurality of pump blades (3) arranged in the inner cavity, each of the pump blades (3) having a receiving portion and a pushing portion, the transmission shaft (2) passing through the receiving portion, and the pushing portion reciprocating in and out of the output port and being used for extruding a transfusion tube; a first cam (4) sleeved on the transmission shaft (2) and arranged on the receiving portion of the pump blade (3); a second cam (5) sleeved on the transmission shaft (2) and arranged on the receiving portion of the pump blade (3); wherein the number of the first cams (4) plus the number of the second cams (5) is equal to the number of the pump blades (3), and the first cams (4) and the second cams (5) are arranged alternately and spaced apart from each other, the first cams (4) and the second cams (5) alternately pushing the corresponding pump blades (3) to make the transfusion tube be regularly extruded.

2. The infusion pump with a new type of cam pushing mechanism according to claim 1, characterized in that, The first cam (4) is provided with a first locking hole, the second cam (5) is provided with a second locking hole, and a pin shaft (6) is arranged between any adjacent first cam (4) and second cam (5), the pin shaft (6) passing through the first locking hole and the second locking hole at the same time.

3. The infusion pump with a new type of cam pushing mechanism according to claim 2, characterized in that, A plurality of guide protrusions (7) are arranged in the inner cavity, the guide protrusions (7) being arranged at the same distance, and one pump blade (3) is arranged between any two adjacent guide protrusions (7).

4. The infusion pump with a new type of cam pushing mechanism according to claim 3, characterized in that, The cross section of the part where the transmission shaft (2) contacts the first cam (4) and the second cam (5) is hexagonal.

5. The infusion pump with a new type of cam pushing mechanism according to claim 4, characterized in that, The utility model also comprises a wear-resistant sheet (8) arranged in the receiving groove of the pump blade (3), one side of the wear-resistant sheet (8) contacting the inner wall of the receiving groove, and the other side contacting the outer edge of the first cam (4) or the second cam (5).

6. The infusion pump with a new type of cam pushing mechanism according to any one of claims 1-5, characterized in that, The end of the pump blade (3) contacting the transfusion tube is semicylindrical.

7. The infusion pump with a new type of cam pushing mechanism according to any one of claims 1-5, characterized in that, The receiving portion of the pump blade (3) is a one-side-opened square groove.

8. The infusion pump with a new type of cam pushing mechanism according to any one of claims 1-5, characterized in that, The utility model also comprises a bearing (9), the pump shell (1) being provided with a rotating groove, the bearing (9) being arranged in the rotating groove, and the transmission shaft (2) passing through the bearing (9).

9. The infusion pump with a new type of cam pushing mechanism according to claim 8, characterized in that, The bearing (9) and the rotating groove are both two and arranged one-to-one, and the two bearings (9) are arranged on the two ends of the transmission shaft (2).