JPH0569382U - Infusion pump - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an infusion pump capable of improving the flow rate accuracy by preventing the tube from meandering in the infusion pump. In an infusion pump for delivering the infusion solution in the tube by a finger 6 which is sequentially pressed along the longitudinal direction of a tube T incorporated in the housing 1 to move the compression point, the fingers 6 are provided around the finger 6. Tube T provided
On the two sides of the finger frame 11 for holding the tube that are not involved in holding the tube, the projections 16, 1 for suppressing the meandering state of the tube.
6 are provided respectively.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to, for example, an infusion pump used for intermittently delivering a fixed amount of infusion in a tube connected to an infusion bag.

[0002]

[Prior Art]

 Conventionally, some infusion pumps of this type have a structure as disclosed in, for example, Japanese Utility Model Publication No. Sho 63-160846.

In such an infusion pump, as shown in FIG. 8, a plurality of fingers b incorporated in a housing a can be moved horizontally by a cam mechanism (not shown) so as to correspond to the fingers b. The tube T set in the rectangular finger frame c so as to be positioned is sequentially pressed along the longitudinal direction to move the compression point so that the infusion solution in the tube T is delivered. It has become.

[0004]

[Problems to be solved by the device]

 However, in the above-described infusion pump having the conventional structure, the tube T itself before being set is usually in a wound state at the time of marketing, and even if it is stretched at the time of setting, the bending tendency remains. As shown by a two-dot broken line, the tube T set in the finger frame c often becomes in a meandering state.

Even if the tubes T are set straight on the finger frame c, the tubes T move laterally as the fingers b press the tubes T during the pump operation. Because it is easily displaced, it deforms into a meandering state. In addition, since the finger frame needs a certain width for the finger to press the tube, it is difficult to form the finger frame narrowly so as to meet the meandering of the tube.

As described above, when the tube is deformed into a meandering state, the portion of the tube with respect to each finger is displaced from the proper position during pump operation, and the pressing action of each finger against the tube becomes non-uniform, and the tube Since the circumference is not completely sealed, there is a problem of poor flow rate accuracy.

An object of the present invention is to provide an infusion pump capable of preventing the tube from meandering and improving the flow rate accuracy.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a housing and a liquid transfused in the tube by moving the compression point by being pressed into the housing and sequentially pressing along the longitudinal direction of the tube. A plurality of fingers, a rectangular finger frame that is attached to the housing, is provided around the compression point, and holds two points in the longitudinal direction of the tube by two opposing sides, and a tube of the finger frame. It is characterized in that projections for suppressing the meandering state of the tube are provided on the other two sides which are not involved in holding.

In this case, the protrusions are provided integrally with the both sides of the finger frame which are not involved in holding the tube so as to interpose the tube therebetween, and at the same time, the fingers corresponding to the protrusions provided on the finger frame are provided. It is preferable that the portions are formed by a spacer and the finger frame is detachably provided in the housing.

[0010]

[Action]

 In other words, in this invention, since the finger frame on which the tube is set is provided with the protrusion that suppresses the meandering state of the tube, the meandering of the tube at the time of setting and during pump operation is reliably prevented, and the accuracy of liquid transfer is improved. Can be improved.

Further, since the protrusions are provided so as to face the two sides of the finger frame that are not involved in holding the tube so as to interpose the tube therebetween, the structure is simplified. Further, it is desirable that the projection is integrally formed with the finger frame.

Further, since the portion of the finger corresponding to the protrusion provided on the finger frame is made into a space by the spacer, the protrusion does not interfere with the finger during the operation of the pump, which affects the pressing of the tube. Absent.

[0013]

【Example】

 Hereinafter, the configuration of the present invention will be described in detail with reference to each embodiment shown in FIGS.

1 to 5 show a first embodiment of an infusion pump according to the present invention. As shown in FIGS. 1 to 3, reference numeral 1 in the drawings denotes a rectangular box-shaped housing.

The front panel 2 of the housing 1 is formed with an opening 3 having a vertically long rectangular shape facing a plurality of fingers 6 described later, and the upper and lower portions of the opening 3 are not shown. Grooves 4 and 5 which are fitted to guide the upper and lower portions of the tube T connected to the infusion bag are provided.

A plurality of fingers 6 are vertically stacked in the housing 1 through a spacer 7 provided so that a space S is formed in a central portion thereof. Each of these fingers 6 is a motor. A plurality of cams 10 provided on a drive shaft 9 rotating at 8 are engaged with each other.

Reference numeral 11 in the figure is made of a synthetic resin material such as ABS resin provided so as to be placed around the compression closing point of the tube T in the circumference of the opening 3 formed in the front panel portion 2 of the housing 1. With a rectangular finger frame, holding grooves 12 and 13 communicating with the grooves 4 and 5 are provided on two opposing upper and lower sides 11a of the finger frame 11, and the widths of the holding grooves 12 and 13 are the same. Is set to have the same size as the diameter of the tube T, so that the two positions in the longitudinal direction of the tube T fitted into the grooves 4 and 5 are held in a positioned state.

Further, as shown in FIG. 4, engaging convex portions 14 and 15 are provided on the upper and lower portions of the left and right outer portions of the other two sides 11b which are not involved in holding the tube T of the finger frame 11. The engaging projections 14 and 15 are fitted into the engaging recesses 1a and 1b formed in the front panel portion 2 of the housing 1 so as to be attachable / detachable, and the left and right sides of the two sides 11b thereof can be attached. A pair of protrusions 16 and 16 are integrally formed in the middle portion of the inner portion, and the distance W between the protrusion ends of the protrusions 16 and 16 is, for example, 4.5 mm when the tube T is crushed. Corresponding to the width of 6.5 mm shown by the chain line in the figure, the width is set to 6.5 mm so as to restrict the lateral movement. In other words, it is desirable that the distance W between the protruding ends of the left and right protrusions 16 and 16 is the same as or slightly larger than the maximum pressing deformation width of the tube T.

That is, each of the fingers 6 projects in the horizontal direction in conjunction with the rotational movement of each cam 10 provided on the same axis of the drive shaft 9 that is rotated by the motor 8 so that the rotational angular positions are sequentially displaced. By moving the compression closing point by sequentially pressing the tubes T positioned and held by the finger frame 11 so as to be positioned corresponding to these fingers 6 from the top to the bottom in the vertical and longitudinal directions. The infusion solution in the tube T is delivered.

On the other hand, the pair of protrusions 16 and 16 integrally provided on both left and right inner side portions of the finger frame 11 have an intermediate portion of the tube T positioned and held in the holding grooves 12 and 13 therebetween. It is located opposite to each other and prevents the meandering state due to the deformation of the tube T at the time of setting shown in FIG. 2 or during pump operation as shown in FIG.

Further, the spacer 7 provided in the central portion of the finger 6 forms a space S at a portion corresponding to the pair of protrusions 16 and 16 provided on the left and right inner side portions of the finger frame 11, whereby the pump 7 is provided. The projections 16 and 16 do not interfere with the fingers 6 during operation.

Reference numeral 17 in the drawing denotes a cover provided on the front panel portion 2 of the housing 1 so as to be openable and closable in a single-opened state. On the back surface of the cover 17, a receiving member 18 is provided. The tube T and the finger frame 11 are positioned and held together. As described above, a plurality of pairs of the projections 16 can be provided within a range that does not significantly affect the number of the fingers 6, other than the configuration in which the pair of projections are laterally opposed and protrude.

FIG. 6 shows a second embodiment according to the present invention, which has a configuration in which two pairs of upper and lower protrusions 16 and 16 are provided in the middle portion of the finger frame 11. Since the other points are the same as those in the first embodiment, the same reference numerals are given and the description thereof is omitted.

FIG. 7 shows a third embodiment according to the present invention, in which a pair of protrusions 16 and 16 are provided on one side of the finger frame 11 while being separated from each other, and on the other side of the frame 11. This is a configuration in which a single protrusion 16 is correspondingly protruded between the two protrusions 16, 16 on one side. As described above, a configuration other than the pair of left and right as in the above-described embodiment is possible. Other than that, the same reference numerals as those in the first and second embodiments are given and the description thereof is omitted.

[0025]

[Effect of the device]

 As is clear from the above description, in the present invention, since the finger frame on which the tube is set is provided with the protrusion that suppresses the meandering state of the tube, the meandering of the tube during the setting and during the pump operation is surely performed. Therefore, it is possible to improve the liquid feeding accuracy and the flow rate accuracy.

Further, as described in claims 2 and 3, since the projections are provided as a pair so as to face each other on two sides of the finger frame that are not involved in holding the tube so as to interpose the tube, they are integrally molded. In addition, the structure is simple and it can be manufactured at low cost.

Further, in claim 4, since the portion of the finger corresponding to the protrusion provided on the finger frame is made to be a space by the spacer, the protrusion does not interfere with the finger during the operation of the pump and the tube of the tube is prevented. Does not affect pressing.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view schematically showing a first embodiment of an infusion pump according to the present invention.

FIG. 2 is a front view of the housing in a state where the cover is removed, as seen from the direction of arrows II-II in FIG.

FIG. 3 is an enlarged cross-sectional view of an essential part of the tube in a set state taken along line III-III in FIG.

FIG. 4 is an explanatory diagram of a finger frame.

FIG. 5 is an explanatory diagram showing a deformed state of a tube during pump operation.

FIG. 6 is a front view of the housing with the cover removed showing the second embodiment of the infusion pump according to the present invention.

FIG. 7 is a front view of the housing with the cover removed showing the third embodiment of the infusion pump according to the present invention.

FIG. 8 is a front view of a housing in a state where a cover is removed, which schematically shows a conventional infusion pump.

[Explanation of symbols]

 1 ... Housing, 6 ... Finger, 11 ... Finger frame, 16, 16 ... Protrusion, T ... Tube.

Claims (4)

[Scope of utility model registration request] 1. A housing, a plurality of fingers which are incorporated in the housing and which sequentially press along the longitudinal direction of the tube to move the compression point to deliver the infusion solution in the tube, and the housing. A rectangular finger frame provided around the compression point and holding two points in the longitudinal direction of the tube by two opposite sides, and the other two sides of the finger frame that are not involved in holding the tube. An infusion pump, characterized in that it is provided with a protrusion for suppressing the meandering state of the tube. 2. The infusion pump according to claim 1, wherein the protrusions are provided so as to face two sides of the finger frame that are not involved in holding the tube, with the tube interposed therebetween. 3. The infusion pump according to claim 1, wherein the protrusion is formed integrally with a finger frame. 4. The infusion pump according to claim 1, wherein a portion of the finger corresponding to the protrusion provided on the finger frame is formed with a spacer.