Pump head device and high-pressure syringe

Abstract

The present application discloses a pump head device and a high-pressure syringe. Among them, the pump head device includes: an inner limiting member; an outer limiting member, which is disposed around at least a part of the outer circumference of the inner limiting member and forms at least one gap together with the inner limiting member, and at least one gap is used to embed a part of the hose and position and define the part of the hose as an arc; a driving member, which is used to drive the inner limiting member and / or the outer limiting member to make the inner limiting member and the outer limiting member rotate relative to each other; wherein, one of the inner limiting member and the outer limiting member includes a conveying wheel, the conveying wheel and the other of the inner limiting member and the outer limiting member form at least one gap, the conveying wheel rotates during the relative rotation of the inner limiting member and the outer limiting member and is used to roll a part of the hose, and the size of at least one gap gradually changes during at least a part of the process of rolling a part of the hose. The above solution can make the infusion speed more stable.

Description

Technical Field

[0001] This application relates to the technical field of infusion devices, and particularly to a pump head device and a high-pressure syringe. Background Art

[0002] Infusion is a common means in existing medical treatments. For example, it is common to perform infusions on some patients in hospitals.

[0003] Currently, a syringe is usually used to pump air into and out of an infusion container to control the infusion speed. However, the method of using a syringe to pump air in and out is prone to form intermittent pressurization and requires manual control, resulting in a rather inflexible operation mode. Summary of the Invention

[0004] The main technical problem to be solved by this application is to provide a pump head device and a high-pressure syringe that can make the infusion speed more stable.

[0005] To solve the above problems, in the first aspect of this application, a pump head device is provided. The pump head device includes: an inner limiting member; an outer limiting member disposed around at least a part of the outer periphery of the inner limiting member, together with the inner limiting member forming at least one gap for embedding a part of a hose and positioning and defining the part of the hose as an arc; a driving member for driving the inner limiting member and / or the outer limiting member to relatively rotate the inner limiting member and the outer limiting member; wherein, one of the inner limiting member and the outer limiting member includes a conveying wheel, the conveying wheel and the other of the inner limiting member and the outer limiting member form the at least one gap, the conveying wheel rotates during the relative rotation of the inner limiting member and the outer limiting member and is used for rolling the part of the hose, and the size of the at least one gap gradually changes during at least a part of the process of the conveying wheel rolling the part of the hose.

[0006] In an embodiment, the size of the corresponding gap remains unchanged during the previous part of the process of the conveying wheel rolling the part of the hose, and the size of the corresponding gap gradually increases from small to large during the remaining part of the process of the conveying wheel rolling the part of the hose.

[0007] In one embodiment, the outer limiting member is a notched annular member; the inner limiting member includes a fixing frame, and the driving member drives the fixing frame to rotate around its axis; the number of the conveying wheels is several, and the several conveying wheels are evenly spaced around the axis of the fixing frame on the fixing frame, and the distances from all the conveying wheels to the axis of the fixing frame are equal; a part of the annular member is at an equal distance from the axis of the fixing frame, so that the size of the corresponding gap remains unchanged during the process of the conveying wheel rolling the previous part of the part of the hose; in the direction away from a part of the annular member, the distance from the remaining part of the annular member to the axis of the fixing frame gradually increases, so that the corresponding gap of the conveying wheel gradually changes from small to large during the process of rolling the remaining part of the part of the hose.

[0008] In one embodiment, during the process of the conveying wheel rolling the part of the hose, the conveying wheel is driven by the part of the hose to rotate.

[0009] In one embodiment, one of the inner limiting member and the outer limiting member is provided with a limiting groove, and the limiting groove is used to circumferentially partially surround the part of the hose, and the minimum distance between the limiting groove and the other of the inner limiting member and the outer limiting member is less than the diameter of the part of the hose.

[0010] In one embodiment, the inner limiting member includes several limiting wheels, the several limiting wheels are evenly spaced around the axis of the inner limiting member, and the circumferential surface of the limiting wheel is recessed to form the limiting groove.

[0011] In one embodiment, at least one gap formed by the conveying wheel and the other of the inner limiting member and the outer limiting member is smaller than the clamping gap formed between the limiting wheel and the outer limiting member, and the clamping gap is the maximum distance between the bottom of the groove of the limiting groove and the side of the outer limiting member close to the inner limiting member.

[0012] In one embodiment, a first shaft is provided on the inner limiting member or the outer limiting member, and the conveying wheel is rotatably connected to the inner limiting member or the outer limiting member through the first shaft; and / or, a second shaft is provided on the inner limiting member, and the limiting wheel is rotatably connected to the inner limiting member through the second shaft.

[0013] In one embodiment, the outer limiting member does not rotate, and the pump head device further includes a transmission shaft. The input end of the transmission shaft is in transmission connection with the driving member, and the output end of the transmission shaft is connected to the inner limiting member. The driving member drives the inner limiting member to rotate through the transmission shaft.

[0014] To solve the above problems, in a second aspect of the present application, a high-pressure syringe is provided, including the pump head device according to any one of the first aspects above.

[0015] In the above solution, the pump head device includes: an inner limiting member; an outer limiting member disposed around at least a part of the outer periphery of the inner limiting member, together with the inner limiting member forming at least one gap for embedding a part of a hose and positioning and defining the part of the hose into an arc shape; a driving member for driving the inner limiting member and / or the outer limiting member to rotate relatively; wherein, one of the inner limiting member and the outer limiting member includes a conveying wheel, the conveying wheel and the other of the inner limiting member and the outer limiting member form at least one gap, the conveying wheel rotates during the relative rotation of the inner limiting member and the outer limiting member and is used for rolling a part of the hose, and the size of at least one gap gradually changes during at least a part of the process of rolling the part of the hose by the conveying wheel. Since the size of at least one gap gradually changes during at least a part of the process of rolling the part of the hose by the conveying wheel, the pressure of the conveying wheel on the hose also gradually changes, and the liquid in the hose can be extruded from the hose more continuously, smoothly and stably. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of a pump head device provided by an embodiment of the present application;

[0018] Figure 2 It is a top view of a pump head device provided by an embodiment of the present application;

[0019] Figure 3 It is a cross-sectional view of a pump head device provided by an embodiment of the present application along the A-A direction;

[0020] Figure 4 It is an exploded view of a pump head device provided by an embodiment of the present application.

[0021] In the figure:

[0022] 100, inner limiting member; 110, first shaft; 120, second shaft; 200, outer limiting member; 300, conveying wheel; 400, limiting wheel; 410, limiting groove; 500, transmission shaft; 600, housing; 700, angular contact ball bearing; 800, snap ring; 900, flange. Detailed Embodiments

[0023] The following will describe the solution of the embodiment of the present application in detail with reference to the drawings of the specification.

[0024] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. The terms "first" and "second" in this article are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after. In addition, "multiple" in this article means two or more than two.

[0025] The embodiments of the present invention provide a pump head device and a high-pressure injector, which are mainly used to transport liquids, so that the liquids in the hose can be reliably and stably transported according to a certain pressure. Among them, the liquid medicine can be a liquid medium such as a contrast agent or a sodium chloride solution.

[0026] Please refer to Figures 1-4 , the pump head device may include an inner limiting member 100; an outer limiting member 200, which is disposed around at least a part of the outer periphery of the inner limiting member 100, and forms at least one gap together with the inner limiting member 100. At least one gap is used to embed a part of the hose and position and define the part of the hose as an arc; a driving member for driving the inner limiting member 100 and / or the outer limiting member 200 to make the inner limiting member 100 and the outer limiting member 200 rotate relative to each other; wherein, one of the inner limiting member 100 and the outer limiting member 200 includes a conveying wheel 300, and the conveying wheel 300 and the other of the inner limiting member 100 and the outer limiting member 200 form at least one gap. The conveying wheel 300 rotates during the relative rotation of the inner limiting member 100 and the outer limiting member 200 and is used to roll a part of the hose, and the size of at least one gap gradually changes during at least a part of the process of the conveying wheel 300 rolling a part of the hose. Since the size of at least one gap gradually changes during at least a part of the process of the conveying wheel 300 rolling a part of the hose, the pressure of the conveying wheel 300 on the hose also gradually changes, and the liquid in the hose can be extruded from the hose more continuously, smoothly and stably.

[0027] The outer limiting member 200 can surround the entire outer periphery of the inner limiting member 100 or a part of the outer periphery of the inner limiting member 100. The driving member can only drive the inner limiting member 100 while the outer limiting member 200 remains stationary, so that the inner limiting member 100 and the outer limiting member 200 rotate relative to each other. For example, in an actual scenario, the outer limiting member 200 does not rotate. The pump head device further includes a transmission shaft 500. The input end of the transmission shaft 500 is in transmission connection with the driving member, and the output end of the transmission shaft 500 is connected to the inner limiting member 100. The driving member drives the inner limiting member 100 to rotate through the transmission shaft 500. The driving member can only drive the outer limiting member 200 while the inner limiting member 100 remains stationary, so that the inner limiting member 100 and the outer limiting member 200 rotate relative to each other. The driving member can also drive the inner limiting member 100 and the outer limiting member 200, as long as the inner limiting member 100 and the outer limiting member 200 can rotate relative to each other, and no specific limitation is made here. The driving member is an element capable of providing power, including but not limited to a motor, etc.

[0028] In this embodiment, the number, installation position, and installation method of the conveying wheels 300 can be flexibly set according to needs, and no specific limitation is made here. If one of the inner limiting member 100 and the outer limiting member 200 includes the conveying wheels 300, then the conveying wheels 300 and the other of the inner limiting member 100 and the outer limiting member 200 form at least one gap. For example, if the inner limiting member 100 includes the conveying wheels 300, the conveying wheels 300 and the outer limiting member 200 form at least one gap. At this time, when there is one conveying wheel 300, the conveying wheel 300 and the outer limiting member 200 form one gap, and when there are multiple conveying wheels 300, the conveying wheels 300 and the outer limiting member 200 form multiple gaps. Another example is that if the outer limiting member 200 includes the conveying wheels 300, the conveying wheels 300 and the inner limiting member 100 form at least one gap. At this time, when there is one conveying wheel 300, the conveying wheel 300 and the inner limiting member 100 form one gap, and when there are multiple conveying wheels 300, the conveying wheels 300 and the inner limiting member 100 form multiple gaps.

[0029] During the relative rotation of the inner limiting member 100 and the outer limiting member 200, the conveying wheel 300 can rotate along with the inner limiting member 100 or the outer limiting member 200. The conveying wheel 300 can also achieve self-rotation. For example, the conveying wheel 300 can be driven to rotate by a part of the hose during the process of rolling a part of the hose. The conveying wheel 300 can roll a part of the hose to realize the conveyance of the liquid in the hose. And because the size of at least one gap gradually changes during at least part of the process of the conveying wheel 300 rolling a part of the hose, the extrusion force of the conveying wheel 300 on the hose gradually changes, and a certain pressure difference is formed in the hose. Thus, while realizing the conveyance of the liquid in the hose, the flow rate of the liquid can be very flexibly controlled, so that the liquid in the hose can be extruded from the hose more continuously, smoothly and stably. The way of changing the size of the gap can be set as needed. For example, the size of at least one gap gradually increases during at least part of the process of the conveying wheel 300 rolling a part of the hose; or the size of at least one gap gradually decreases during at least part of the process of the conveying wheel 300 rolling a part of the hose; or it first gradually increases and then gradually decreases; or during at least part of the process of the conveying wheel 300 rolling a part of the hose, the size of at least one gap remains unchanged in part, while the other part changes from small to large or from large to small, etc., and no specific limitation is made here.

[0030] In an embodiment, the size of the corresponding gap remains unchanged during the first part of the process of the conveying wheel 300 rolling a part of the hose, and the corresponding gap of the conveying wheel 300 gradually changes from small to large during the remaining part of the process of the conveying wheel 300 rolling a part of the hose. When the size of the gap remains unchanged, the liquid in the hose can be stably conveyed, and the hose can be prevented from falling off from the gap; and when the gap gradually changes from small to large, while conveying the liquid in the hose, the flow rate of the liquid can be controlled, so that the liquid conveying speed gradually changes. Especially when the gap is small, the extrusion force on the hose is increased to ensure the liquid conveying volume, and when the gap is large, the extrusion force on the hose is reduced to smooth the output of the liquid and supplement new liquid. Figure 2For example, there are three points a, b, and c on the outer limiting member 200. The gap corresponding to the position from a to b is the X section, and the gap corresponding to the position from b to c is the Y section. The size of the gap corresponding to the X section remains unchanged during the process of the conveying wheel 300 rolling the front part of a part of the hose; while the size of the gap corresponding to the Y section of the conveying wheel 300 gradually changes from small to large during the process of rolling the remaining part of a part of the hose. Of course, in an embodiment, the front part of this part of the hose can be the first preset length range near the input end of the hose, and the remaining part of the part of the hose is closer to the output end of the hose. Thus, within the range from the input end to the output end of the hose, the liquid in the hose is first smoothly conveyed, and then the extrusion pressure on the liquid in the hose is slowly reduced. Since the gap is relatively large near the output end, it is convenient to take out the hose. In another embodiment, the front part of the part of the hose can be the second preset length range near the output end of the hose, and the remaining part of the part of the hose is closer to the input end of the hose. Thus, since the gap is relatively large near the input end, it is convenient to install the hose into the gap, and within the range from the input end to the output end of the hose, the extrusion pressure on the liquid conveyed in the hose is continuously increased to ensure the liquid delivery volume, and then the extrusion pressure on the liquid in the hose is maintained. Among them, the first preset length range and the second preset length range can be set as needed. The input end of the hose can be Figure 2 either the inlet side or the outlet side of the outer limiting member 200 shown, and the output end of the hose is the other of the inlet side or the outlet side.

[0031] Taking the conveying wheel 300 disposed on the inner limiting member 100 as an example, it is specifically described how the size of the gap can be gradually changed. In an embodiment, the outer limiting member 200 may be an annular member with a notch. The inner limiting member 100 may include a fixing frame, and a driving member drives the fixing frame to rotate around its axis, so that the driving member drives the inner limiting member 100 by driving the rotation of the fixing frame of the inner limiting member 100. The number of the conveying wheels 300 is several, and the several conveying wheels 300 are evenly spaced around the axis of the fixing frame on the fixing frame, and the distances from all the conveying wheels 300 to the axis of the fixing frame are equal. A part of the annular member is at an equal distance from the axis of the fixing frame, so that the size of the corresponding gap remains unchanged during the process of the conveying wheel 300 rolling the front part of a part of the hose. However, in the direction away from a part of the annular member, the distance from the remaining part of the annular member to the axis of the fixing frame gradually increases, so that the corresponding gap of the conveying wheel 300 gradually changes from small to large during the process of rolling the remaining part of a part of the hose. In an actual scenario, one side of the notch of the annular member is the input end of the hose, and the other side of the notch is the output end of the hose. And the annular member may include a first annular member and a second annular member whose tangents intersect and respectively include the input end and the output end of the hose. The radius of the first annular member is greater than the radius of the second annular member. The axis of the first annular member deviates from the axis of the inner limiting member 100 by a first preset distance, and the axis of the second annular member coincides with the axis of the inner limiting member 100, so that the inner limiting member 100 and the outer limiting member 200 are eccentrically arranged, so that during the process of the driving member driving the inner limiting member 100 to rotate, the conveying wheel 300 can squeeze the hose with different pressures respectively during the rotation from the input end to the output end of the hose.

[0032] The size of at least one of the above gaps can also be other ways to achieve a gradual change in the gap size. For example, the outer limiting member 200 can be a notched annular member, and the annular member is a circular ring of the same radius size. The axis of the circular ring is deviated from the axis of the inner limiting member 100 by a second preset distance. Thus, when the radius size of the circular ring is appropriate and the deviation distance from the inner limiting member 100 is appropriate, the size of the gap gradually decreases from the input end of the hose to the output end of the hose, so that during the process of the driving member driving the inner limiting member 100 to rotate, the pressure of the inner limiting member 100 driving the same conveying wheel 300 to squeeze the hose gradually increases. In an actual scenario, when the distances between the inner limiting member 100 and the outer limiting member 200 are the same, the gradual change in the size of at least one gap during at least part of the process of the conveying wheel 300 rolling on part of the hose can be achieved by adjusting the outer diameter size of the conveying wheel 300. For example: the outer limiting member 200 is a notched annular member, one side of the notch is the input end of the hose, and the other side of the notch is the output end of the hose; the distances between the side of the inner limiting member 100 facing the outer limiting member 200 and the side of the outer limiting member 200 facing the inner limiting member are the same, and a plurality of conveying wheels 300 are arranged at equal distances around the axis of the inner limiting member 100; the outer diameters of at least part of the continuously spaced conveying wheels 300 gradually increase from the input end of the hose to the output end of the hose, so that in the path from the input end of the hose to the output end of the hose, the gaps between at least part of the continuously spaced conveying wheels 300 and the side of the outer limiting member 200 facing the inner limiting member 100 gradually decrease. The above is only an exemplary description, and no specific limitation is made on different ways of gradually changing the gap size.

[0033] The at least one gap is used to embed a part of the hose and position and limit the part of the hose into an arc shape. Therefore, in order to better limit the hose in the gap, one of the inner limit member 100 and the outer limit member 200 can be provided with a limit groove 410, which is used to partially surround the part of the hose in the circumferential direction, and the minimum distance between the limit groove 410 and the other of the inner limit member 100 and the outer limit member 200 is less than the diameter of the part of the hose, so that a part of the hose is embedded in the limit groove 410, so as to limit the hose and prevent the hose from falling out of the gap. In the case where the inner limit member 100 includes a conveying wheel 300, and the conveying wheel 300 and the outer limit member 200 form at least one gap, the inner limit member 100 can be provided with a limit groove 410, and the minimum distance between the limit groove 410 and the outer limit member 200 is smaller than the diameter of the portion of the hose, or the outer limit member 200 can be provided with a limit groove 410, and the minimum distance between the limit groove 410 and the inner limit member 100 is smaller than the diameter of the portion of the hose, so as to prevent the hose from escaping from the gap. In the case where the outer limiting member 200 includes the conveying wheel 300, and the conveying wheel 300 and the inner limiting member 100 form at least one gap, the outer limiting member 200 can be provided with a limiting groove 410, and the minimum distance between the limiting groove 410 and the inner limiting member 100 is less than the diameter of the part of the hose, or the inner limiting member 100 can be provided with a limiting groove 410, and the minimum distance between the limiting groove 410 and the outer limiting member 200 is less than the diameter of the part of the hose.

[0034] The limiting groove 410 may be in various forms, including but not limited to the inner limiting member 100 or the outer limiting member 200 and the conveying wheel 300 being recessed near one side to form the limiting groove 410, or the circumferential surface of the limiting wheel 400 provided on the pump head device being recessed to form the limiting groove 410, etc. In one embodiment, the inner limiting member 100 includes the conveying wheel 300, and the conveying wheel 300 and the outer limiting member 200 form at least one gap, and the outer limiting member 200 and the conveying wheel 300 are recessed near one side to form the limiting groove 410. In one embodiment, the inner limiting member 100 may include a plurality of limiting wheels 400, and the plurality of limiting wheels 400 are evenly spaced and arranged around the axis of the inner limiting member 100, and the circumferential surface of the limiting wheel 400 is recessed to form the limiting groove 410.

[0035] While cooperating with the guiding and restricting function of the limiting wheel 400 and ensuring that the conveying wheel 300 squeezes the hose, at least one gap formed by the conveying wheel 300 and the other of the inner limiting member 100 and the outer limiting member 200 can be smaller than the clamping gap formed between the limiting wheel 400 and the outer limiting member 200. The clamping gap is the maximum distance between the bottom of the groove of the limiting groove 410 and the side of the outer limiting member 200 close to the inner limiting member 100. In an actual scenario, the circumferential surface of each limiting wheel 400 is recessed to form a limiting groove 410, and the outer peripheral wall of each conveying wheel 300 is a smooth circumferential surface, that is, there is no recess on the circumferential surface of the conveying wheel 300. The clamping gap formed between the bottom of the groove of the limiting groove 410 and the side of the outer limiting member 200 close to the inner limiting member 100 is greater than the gap formed between the circumferential surface of the conveying wheel 300 and the inner wall of the outer limiting member 200. The setting of the limiting groove 410 not only does not affect the formation of a clamping gap larger than the gap between the limiting wheel 400 and the outer limiting member 200, but also can appropriately limit the infusion hose and effectively prevent the infusion hose from falling off the limiting groove 410 on the limiting wheel 400, thereby ensuring the normal progress of infusion.

[0036] For the conveying wheel 300 and the limiting wheel 400, their numbers can both be set as needed. For example, in an actual scenario, there are three conveying wheels 300, which are symmetrically distributed around the center on the inner limiting member 100, and there are also three limiting wheels 400, which are symmetrically distributed around the center on the inner limiting member 100. By adopting three limiting wheels 400 and three conveying wheels 300, an appropriate number of limiting wheels 400 and conveying wheels 300 can effectively reduce the production cost, and can also well form a squeezing action of squeezing and loosening the hose multiple times, and achieve the effect of continuous output of infusion through the squeezing action of squeezing and loosening multiple times, meeting the requirement of the pump head device to ensure continuous infusion of the hose. More specifically, the limiting wheel 400 and the conveying wheel 300 are preferably three, and the actual numbers of the limiting wheel 400 and the conveying wheel 300 can be designed according to actual needs.

[0037] The installation methods of the conveying wheel 300 and the limiting wheel 400 can also be set as needed. For example, in an actual scenario, a first shaft 110 is provided on the inner limiting member 100 or the outer limiting member 200, so that the conveying wheel 300 can be rotatably connected to the inner limiting member 100 or the outer limiting member 200 through the first shaft 110. A second shaft 120 is provided on the inner limiting member 100, and the limiting wheel 400 can be rotatably connected to the inner limiting member 100 through the second shaft 120. By installing the conveying wheel 300 and the limiting wheel 400 on the inner limiting member 100 or the outer limiting member 200 through shafts, the structure is simple.

[0038] When multiple conveying wheels 300 are rotationally connected to the inner limiting member 100 through the first shaft 110, the inner limiting member 100 is provided with the first shafts 110 corresponding to the conveying wheels 300 one by one; the conveying wheels 300 are rotationally sleeved on the corresponding first shafts 110. The first shafts 110 are fixedly installed on the disk surface of the inner limiting member 100, which can be used as the installation part for the rotational connection between the conveying wheels 300 and the inner limiting member 100, meeting both the requirement of the rotational connection between the conveying wheels 300 and the inner limiting member 100 and ensuring the detachable property of the conveying wheels 300, facilitating subsequent replacement and maintenance. Further, the conveying wheels 300 and the first shafts 110 can be fixed through angular contact ball bearings 700 and snap rings 800. The angular contact ball bearings 700 have the advantages of simple structure, relatively small frictional torque, high rotational accuracy and low noise, can bear both radial load and axial load simultaneously, and can work at a relatively high rotational speed, which is beneficial to ensuring the stable rotation of the conveying wheels 300 on the inner limiting member 100. Through the setting of the snap rings 800, a certain axial limiting effect can be formed on the conveying wheels 300, which is beneficial to preventing the axial movement of the conveying wheels 300.

[0039] When multiple limiting wheels 400 are rotationally connected to the inner limiting member 100 through the second shaft 120, the inner limiting member 100 is provided with the second shafts 120 corresponding to the limiting wheels 400 one by one; the limiting wheels 400 are in clearance fit with the second shafts 120. The second shafts 120 are fixedly installed on the inner limiting member 100, which can be used as the installation part for the rotational connection between the limiting wheels 400 and the inner limiting member 100, meeting both the requirement of the rotational connection between the limiting wheels 400 and the inner limiting member 100 and ensuring the detachable property of the limiting wheels 400, facilitating subsequent replacement and maintenance. More specifically, the peripheral wall of the second shaft 120 is circular, and the limiting wheels 400 are sleeved on the second shafts 120, so that the limiting wheels 400 in clearance fit with the second shafts 120 can rotate on the inner limiting member 100.

[0040] In an implementation scenario, the pump head device may include a housing 600. The outer limiting member 200 is fixed to the edge of the top of the housing 600 and surrounds at least a part of the outer periphery of the inner limiting member 100, and together with the inner limiting member 100 forms at least one gap for embedding a part of the hose and positioning and defining the part of the hose as an arc. The pump head device may further include a transmission shaft 500. The transmission shaft 500 is rotatably installed inside the housing 600, the inner limiting member 100 is rotatably arranged on the housing 600 through the transmission shaft 500, and the input end of the transmission shaft 500 is in transmission connection with the driving member, the output end of the transmission shaft 500 is connected to the inner limiting member 100, and the driving member drives the inner limiting member 100 to rotate through the transmission shaft 500, so that the inner limiting member 100 and the outer limiting member 200 rotate relative to each other. For example, the transmission shaft 500 is rotatably connected to the inner wall of the housing 600 through angular contact ball bearings 700. The angular contact ball bearings 700 have the advantages of simple structure, relatively small frictional torque, high rotational accuracy and low noise, can bear radial load and axial load at the same time, and can work at a relatively high rotational speed, which is beneficial to ensuring the stable rotation of the transmission shaft 500 on the inner limiting member 100. The angular contact ball bearings 700 may be two groups, and the two groups of angular contact ball bearings 700 are sleeved on the transmission shaft 500 in parallel. Through the two groups of angular contact ball bearings 700, not only can it be ensured that the transmission shaft 500 can rotate stably on the inner limiting member 100, but also the pre-tightening force between the two groups of angular contact ball bearings 700 and the housing 600 can be used to effectively bisect the gravity from the inner limiting member 100, the conveying wheel 300 and the limiting wheel 400, avoiding the inclination of the inner limiting member 100 and the transmission shaft 500, and ensuring that the entire transmission shaft 500 and the inner limiting member 100 are always on the same axis as the housing 600 for operation. When the transmission shaft 500 is rotatably connected to the inner wall of the housing 600 through angular contact ball bearings 700, the number of the angular contact ball bearings 700 may also be other numbers, which are not specifically limited herein.Taking one of the actual scenarios as an example, before the pump head device operates, the drive shaft 500 drives the inner limiting member 100 to rotate. Driven by the movement of the inner limiting member 100, the hose passes through the respective gaps or nip formed between the outer limiting member 200 and the conveying wheel 300 or the limiting wheel 400 in sequence from the inlet side to the outlet side of the outer limiting member 200. During infusion, the drive member drives the drive shaft 500 to drive the inner limiting member 100 to rotate, and then drives the conveying wheel 300 and the limiting wheel 400 on the rotating inner limiting member 100 to move accordingly. Since the gap formed between the conveying wheel 300 and the outer limiting member 200 can be smaller than the nip formed between the adjacent limiting wheel 400 and the outer limiting member 200, and at the same time the conveying wheel 300 and the limiting wheel 400 are arranged alternately, a squeezing and loosening action of squeezing the hose multiple times at intervals can be formed. And the size of at least one gap of the conveying wheel 300 can gradually become smaller along the direction from the inlet side to the outlet side of the outer limiting member 200 during at least part of the process of rolling part of the hose, so that the squeezing effect on the hose becomes stronger and stronger along the direction from the inlet side to the outlet side of the outer limiting member 200, and the hose is squeezed smaller and smaller, so that a sufficient large pressure difference is formed between the inlet side and the outlet side inside the hose, so that the liquid in the hose can be continuously transported from the inlet side to the outlet side, which can not only ensure the continuity of infusion, but also effectively improve the infusion efficiency, and also has the advantages of simple structure and convenient operation. For example, in an actual scenario, the housing 600 is in a circular ring shape, and the drive shaft 500 is rotatably installed inside the housing 600. The outer limiting member 200 is in an arc shape and is fixed at the edge of the top of the housing 600; the conveying wheel 300 and the limiting wheel 400 can be arranged alternately on the inner limiting member 100 one by one; the outlet side and the inlet side can be either a point on the inner wall of the outer limiting member 200 or a section of line segment on the inner wall of the outer limiting member 200. Preferably, the outer limiting member 200 is divided into two equal parts as the outlet side and the inlet side; the minimum gap of the conveying wheel 300 and the limiting wheel 400 at the outlet side can be smaller than the thickness of the two hose tube walls, so that the hose will eventually be completely flattened, that is, the hose is squeezed into a flat tube with the thickness of two tube walls. Of course, the gaps of the conveying wheel 300 and the limiting wheel 400 at the outlet side and the inlet side can also be of other sizes, which are not specifically limited here.

[0041] In another actual scenario, a flange 900 for preventing the axial movement of the inner limiting member 100 can be installed on the inner limiting member 100 in the axial direction. Through the setting of the flange 900 and combined with the limiting convex ring at the tail end of the drive shaft 500, the axial limiting of the inner limiting member 100 can be effectively carried out, which is beneficial to preventing the axial transmission of the inner limiting member 100 and ensuring that the inner limiting member 100 is always in a stable and non-loose state during rotation.

[0042] As described above, during at least part of the process of rolling a part of the hose by the conveying wheel 300, the size of at least one gap gradually changes, which may include any one of the following situations or combinations:

[0043] 1) The size of a gap formed between one conveying wheel 300 and the outer limiting member 200 or the inner limiting member 100 gradually changes during at least part of the process of rolling a part of the hose. This gradual change is reflected in the variable size of a gap;

[0044] 2) The sizes of multiple gaps formed between multiple conveying wheels 300 and the outer limiting member 200 or the inner limiting member 100 gradually change during at least part of the process of rolling a part of the hose. This gradual change is reflected in the different sizes between different gaps, and the size of a single gap remains unchanged;

[0045] 3) The sizes of multiple gaps formed between multiple conveying wheels 300 and the outer limiting member 200 or the inner limiting member 100 gradually change during at least part of the process of rolling a part of the hose, and the size of at least one of the gaps also gradually changes during at least part of the process of rolling a part of the hose. This gradual change is reflected in the different sizes between different gaps, and the size of at least one gap is variable.

[0046] This embodiment also provides a high-pressure syringe, including the above-mentioned pump head device. By adopting the pump head device with the above special structure, it can not only ensure that the infusion can be continuously, stably and smoothly delivered, but also greatly improve the pressure and speed of the infusion to meet the requirements of high-pressure injection.

[0047] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0048] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pump head device, characterized in that, Comprising: Inner limiting member; Outer limiting member, disposed around at least a part of the outer periphery of the inner limiting member, and together with the inner limiting member forming at least one gap, the at least one gap being for embedding a part of a hose and positioning and defining the part of the hose as an arc; Driving member, for driving the inner limiting member and / or the outer limiting member to relatively rotate the inner limiting member and the outer limiting member; Wherein, one of the inner limiting member and the outer limiting member includes a plurality of conveying wheels arranged at uniform intervals, the plurality of conveying wheels and the other of the inner limiting member and the outer limiting member constituting the at least one gap, the conveying wheels rotating during the relative rotation of the inner limiting member and the outer limiting member and being for rolling the part of the hose, and the size of the at least one gap gradually changing during at least a part of the process of the conveying wheels rolling the part of the hose.

2. The pump head device according to claim 1, wherein: The size of the corresponding gap remains unchanged during the process of the conveying wheels rolling the previous part of the part of the hose, and the size of the corresponding gap gradually changes from small to large during the process of the conveying wheels rolling the remaining part of the part of the hose.

3. The pump head device according to claim 2, wherein: The outer limiting member is an annular member with a notch; The inner limiting member includes a fixing frame, and the driving member drives the fixing frame to rotate around its axis; The plurality of conveying wheels are arranged around the axis of the fixing frame at uniform intervals on the fixing frame, and the distances from all the conveying wheels to the axis of the fixing frame are equal; The distances from a part of the annular member to the axis of the fixing frame are equal, so that the size of the corresponding gap remains unchanged during the process of the conveying wheels rolling the previous part of the part of the hose; in the direction away from the part of the annular member, the distances from the remaining part of the annular member to the axis of the fixing frame gradually increase, so that the size of the corresponding gap gradually changes from small to large during the process of the conveying wheels rolling the remaining part of the part of the hose.

4. The pump head device according to any one of claims 1 to 3, wherein: The conveying wheels are rotated by the part of the hose during the process of the conveying wheels rolling the part of the hose.

5. The pump head device according to any one of claims 1 to 3, wherein: One of the inner limiting member and the outer limiting member is provided with a limiting groove, the limiting groove being for circumferentially partially surrounding the part of the hose, and the minimum distance between the limiting groove and the other of the inner limiting member and the outer limiting member being less than the diameter of the part of the hose.

6. The pump head device according to claim 5, wherein: The inner limiting member includes a plurality of limiting wheels, the plurality of limiting wheels being arranged around the axis of the inner limiting member at uniform intervals, and the circumferential surface of the limiting wheel being recessed to form the limiting groove.

7. The pump head device according to claim 6, wherein: The at least one gap formed by the conveying wheel and the other of the inner limiting member and the outer limiting member is smaller than the clamping gap formed between the limiting wheel and the outer limiting member, and the clamping gap is the maximum distance between the bottom of the groove of the limiting groove and the side of the outer limiting member close to the inner limiting member.

8. The pump head device according to claim 7, wherein, A first shaft is provided on the inner limiting member or the outer limiting member, and the conveying wheel is rotatably connected to the inner limiting member or the outer limiting member through the first shaft; And / or, a second shaft is provided on the inner limiting member, and the limiting wheel is rotatably connected to the inner limiting member through the second shaft.

9. The pump head device according to claim 1, characterized in that, The outer limiting member does not rotate, and the pump head device further includes a transmission shaft. The input end of the transmission shaft is in transmission connection with the driving member, the output end of the transmission shaft is connected to the inner limiting member, and the driving member drives the inner limiting member to rotate through the transmission shaft.

10. A high-pressure syringe, characterized in that, Including the pump head device according to any one of claims 1-9.

Images