CN101745161B - Medical low-level uniform pressure infusion set - Google Patents

Abstract

The present invention relates to a low-level uniform pressure infusion device and a method for using it. There is an inner tank for containing medicinal liquid in the bottle and a pressurizing device. The bottom is a base on which a coaxial limiting cylinder and a spring fixing sleeve are fixed. The slanted downward limiting groove has a non-return groove at its bottom. The outer wall of the spring fixing sleeve has a positioning block. The movable sleeve is loaded into the limit cylinder, and the limit protruding teeth on the outer edge of the upper end plate are embedded in the limit groove and snapped into the non-return groove. The piston is buckled on the spring fixing sleeve of the base, and the draw-in groove on the lower edge of the barrel body is embedded in the positioning block of the spring fixing sleeve. The first-stage spring is located between the spring fixed sleeve and the limiting cylinder, and its lower end is against the upper end of the base to connect with the sliding top plate; the second-level spring is located between the limiting cylinder and the movable sleeve, and its lower end is against the upper end of the base against the movable sleeve The upper end plate; the three-stage spring is located in the movable sleeve, the lower end is against the lower end plate, and the upper end is against the sliding top plate. When in use, the sliding top plate presses down the three springs, and the second spring exerts force behind, so that the pressure on the inner tank is even and the infusion pressure is constant.

Description

Medical low level uniform pressure infusion set

(1) Technical field

The invention relates to a medical infusion device, in particular to a medical low-level uniform pressure infusion device and a use method thereof. the

(2) Background technology

Intravenous fluids are commonly used as a treatment. The traditional infusion method is to place the infusion medicine bottle at a certain height, and use the gravity drop of the liquid to overcome the venous blood pressure of the human body, so that the medicinal liquid enters the human vein through the needle. The low-level infusion set is to use a pressure device to press the medicine into the veins of the human body. The low-position infusion set does not need to be hung and can be placed beside the patient or carried with him. It is especially suitable for outdoor first aid and field rescue, such as earthquake-resistant sites, military battlefields and other limited and urgent occasions. Be 200410081363 Chinese invention patent " medical low position infusion device " as patent No., asked the market not long ago. It is mainly composed of a bottle body, an inner tank for containing medicinal liquid and a pressurizing device. The pressurizing device includes a sliding top plate, an elastic return element, a pull rod and a locking piece. After the elastic return force element is compressed, its elastic return force pushes the sliding top plate which is fixedly connected with it, and the sliding top plate presses the inner tank on it to squeeze out the medicinal liquid therein. the

The defect of this kind of low-position infusion set is that the elastic return force element is only a spring or compressed rubber. At the initial stage when the amount of compression is relatively large, the elastic force released by it is relatively large, and the pressure on the inner tank is relatively large; , along with the extension of the elastic resilience element, its restoring force gradually decreases, and the pressure on the inner tank gradually decreases. Especially when the amount of liquid medicine in the inner tank is large, or when the infusion needs to be performed slowly for a long time, in order to make the elastic force of the elastic return element of the pressurizing device release the elastic force slowly, and at the same time ensure the pressure value per unit time, no Springs with larger lengths or diameters are not used, which increases the volume of the low-position infusion set. And the problem of inhomogeneous pressure in the infusion process still cannot be solved thoroughly. the

(3) Contents of the invention

The object of the present invention is to provide a small and portable low-position uniform pressure infusion device and its use method, which can provide uniform pressure during the infusion process. the

The low-level uniform pressure infusion device designed by the present invention includes a cylindrical bottle body with a bottleneck, a compressible inner container capable of containing medicinal liquid in the bottle, and a pressurizing device. The device is located in the bottle body and below the liner. The pressurizing device includes a sliding top plate, an elastic return element, a pull rod and a locking piece. The top surface of the sliding top plate is located at the bottom of the liner, the top of the pull rod is connected with the sliding top plate, and the bottom end is fixedly connected with the locking piece. There are also a base and a movable sleeve, and the elastic return force element includes a primary spring, a secondary spring and a tertiary spring. the

The bottle body is a cylinder with a bottom opening, the top is a bottle mouth, and a base is installed at the bottom of the bottle body. The base includes a cylindrical seat body and a bottom surface sealedly connected with it, and the bottom surface has a central hole. The outer diameter of the seat body is slightly smaller than the inner diameter of the bottle. There is a convex ring at the lower end of the inner wall of the bottle, and an annular groove matched with it on the outer wall of the seat body. In the slot, the two are connected. The bottom surface in the seat body is also fixed with a limiting cylinder and a spring fixing sleeve concentric with the seat body, the limiting cylinder is in the innermost layer, and the limiting cylinder and the spring fixing sleeve have the same height. There are 3 to 6 slanting downward limiting grooves on the upper end of the limiting cylinder inner wall, and the bottom of the limiting grooves is a horizontal or slanting upward non-return groove. The outer wall of the spring fixing sleeve has 3 to 6 raised positioning blocks. the

The upper end of the movable sleeve is connected with the annular upper end plate, the inner diameter of the upper end plate is equal to the inner diameter of the movable sleeve, and the outer diameter is slightly smaller than the inner diameter of the limit cylinder; the lower end of the movable sleeve is connected with the annular lower end plate, the outer diameter of the lower end plate is equal to the inner diameter of the movable sleeve, and the inner diameter is slightly Greater than the diameter of the tie rod, the upper and lower end plates are perpendicular to the center line of the movable sleeve. The outer edge of the upper end plate of the movable sleeve has 3 to 6 limiting protruding teeth that match the limiting grooves on the inner wall of the limiting cylinder. In the limiting groove of the movable sleeve, the movable sleeve moves down while rotating, and with the rotation of the movable sleeve, its limiting protruding teeth snap into the non-return groove at the bottom of the limiting groove. The inner edge of the lower end plate of the movable sleeve is connected with the concentric inner cylinder. The inner diameter of the inner cylinder is larger than the outer diameter of the pull rod, the outer diameter is smaller than the inner diameter of the three-stage spring, and its height is 2/3 to 1/2 of the height of the movable sleeve. The upper edge of the inner cylinder has 2 to 4 convex teeth of the inner cylinder. the

The piston is an inverted cylinder, the top surface is located below the inner tank, the outer diameter is slightly smaller than the inner diameter of the bottle, and matches the bottom surface of the inner tank. The inner diameter of the barrel body is slightly larger than the outer diameter of the spring fixing sleeve, but less than the outer diameter of the positioning block on the outer wall of the spring fixing sleeve. The lower edge of the piston barrel body has 3 to 6 draw-in grooves that match the positioning blocks on the outer wall of the spring fixing sleeve. When the piston is buckled on the spring fixing sleeve of the base, the slot on the lower edge of the piston barrel is inserted into the positioning block of the spring fixing sleeve, so that the total height of the piston and the base is determined, and the height of the bottle body above the piston is filled with the inner tank. Height after liquid medicine. There are 2 to 4 locking blocks under the inner wall of the piston barrel body. the

The long diameter of the sliding top plate is slightly smaller than the inner diameter of the piston barrel body, and the outer edge of the long diameter has 2 to 4 locking teeth that match the locking stoppers on the inner wall of the piston barrel body. The center of the bottom of the sliding top plate is connected with a guide cylinder whose outer diameter is smaller than the inner diameter of the three-stage spring and whose height is 1/3 to 1/2 of the height of the movable sleeve. Its inner hole is a screw hole matched with the thread of the pull rod, and the pull rod is screwed into the guide cylinder to be connected with the sliding top plate. The bottom edge of the guide cylinder of the sliding top plate has 2 to 4 convex teeth of the guide cylinder matched with the convex teeth of the inner tube of the movable sleeve. When the sliding top plate is pressed against the upper end plate of the movable sleeve, the convex teeth of the guide cylinder of the sliding top plate and the convex teeth of the inner cylinder of the movable sleeve mesh with each other. the

Pull rod is the screw rod that matches with sliding top plate guide cylinder screw hole, and pull rod length equals the distance between the base bottom surface to the piston top surface that is installed on the base spring retainer. The lower end of the pull rod passes through the center hole of the movable sleeve and the bottom surface of the base, and the locking piece is located below the bottom surface. In order to facilitate the rotation of the pull rod, the locking piece at the bottom is a butterfly locking piece. the

The elastic return force element includes three cylindrical coil springs with different diameters centered on the pull rod. The first-stage spring with the largest diameter on the outermost layer is located between the spring fixing sleeve and the limiting cylinder, the lower end is against the bottom surface of the base, and the upper end is connected to the sliding top plate; the second-level spring is located between the limiting cylinder and the movable sleeve, Its lower end is against the bottom surface of the base, and its upper end is against the upper end plate of the movable sleeve; the three-stage spring is sleeved outside the pull rod and located in the movable sleeve, its lower end is against the lower end plate of the movable sleeve, and its upper end is against the sliding top plate. the

In order to facilitate the fixing of the spring, there is a positioning groove on the outer edge of the sliding top plate, and the upper end of the primary spring is inserted into the positioning groove, and is fixedly connected with the sliding top plate. The upper end of the three-stage spring is sleeved outside the guide cylinder and connected with the guide cylinder. The outer wall of the guide cylinder can also be evenly distributed with 3 to 8 protruding retaining bars parallel to the center of the pull rod. The outer diameter of the retaining bars is equal to the inner diameter of the third-stage spring. connect. the

The outer edge of the upper end plate of the movable sleeve is folded down to form an annular slot with an opening downward. The upper end of the secondary spring is inserted into the annular slot and abuts against the upper end plate of the movable sleeve. the

In order to protect the locking part, and also to make the infusion set upright and stable, the body of the base extends downward from the bottom surface, and the extended length is slightly longer than the length of the locking part at the bottom of the pull rod. the

The using method of the low-level uniform pressure infusion set of the present invention is as follows:

I. Assembly

The liner is put into the bottle body, the opening of the liner is fixedly connected with the mouth of the bottle body, and the opening and the mouth of the liner are sealed after the medicine liquid is filled in the liner. the

Put the secondary spring in the limiting cylinder of the base, the movable sleeve presses on the secondary spring, the movable sleeve enters the limiting cylinder during rotation, and compresses the secondary spring at the same time, the limit of the outer edge of the upper end plate of the movable sleeve The protruding teeth move down along the limit groove on the inner wall of the limit cylinder, and with the rotation of the movable sleeve, the limit protruding teeth are inserted into the non-return groove, and the secondary spring is compressed between the bottom surface of the base and the upper end plate of the movable sleeve. between. After that, the upper end of the first-stage spring is connected with the sliding top plate, and the upper end of the third-stage spring is hooped outside the guide cylinder of the sliding top plate. The lower end of the third-stage spring is put into the movable sleeve and sleeved outside the inner cylinder, the lower end of the first-stage spring is placed between the spring fixing sleeve and the limit cylinder, the bottom end of the tie rod connected to the locking part is inserted from the bottom of the base, and the top end is screwed in and slides In the screw hole of the guide cylinder on the top plate, the piston is buckled on the base, and the draw-in groove on the lower edge of the barrel body of the piston is inserted into the positioning block of the spring fixing sleeve. The base and its spring, the sliding top plate, the movable sleeve and the piston are inserted into the bottle body from the bottom, and the two are connected, and the infusion set is assembled and ready for use. the

At this time, the sliding top plate is at the top of the pull rod, close to the top surface of the piston, the locking member at the tail end of the pull rod is close to the bottom surface of the base, the primary and secondary springs are in stretched state, and the secondary spring is in compressed state. the

There is a positioning groove on the outer edge of the sliding top plate, and the upper end of the first-stage spring is inserted into the positioning groove, and is fixedly connected with the sliding top plate. the

The outer edge of the upper end plate of the movable sleeve is folded down to form an annular slot with an opening downward. The upper end of the secondary spring is inserted into the annular slot and abuts against the upper end plate of the movable sleeve. the

II. Use of infusion

The liquid-taking plug of the infusion tube is inserted into the inner tank from the bottle mouth of the infusion set, the pull rod is pulled down and rotated at the same time, the sliding top plate at the top presses down the first and third-stage springs, until the locking teeth on the outer edge of the sliding top plate clamp the piston barrel body The stopper on the inner wall, and the convex teeth of the guide cylinder on the sliding top plate and the convex teeth on the inner cylinder of the movable sleeve mesh with each other, the sliding top plate drives the movable sleeve to rotate, and the limit protrusion on the outer edge of the upper end plate of the movable sleeve The teeth leave the non-return groove of the limit cylinder and are at the bottom of the limit groove. The sliding top plate is limited and can no longer be rotated. Continue to rotate the pull rod, the sliding top plate compresses the three springs completely, and the upper end of the pull rod is unscrewed from the sliding top plate until it reaches the top surface of the piston. Continue to turn the locking piece firmly to disengage it from the tie rod. the

There is no resistance at the end of the pull rod, the three springs stretch simultaneously, the elastic force pushes up the movable top plate and the pull rod, the top of the pull rod pushes against the top surface of the piston to move upward, the piston presses the inner tank, and the elastic force is smoothly and evenly transmitted to the bottom of the inner tank. Because the limiting protruding teeth on the upper end plate of the movable sleeve are embedded in the limiting grooves on the inner wall of the limiting cylinder, when the secondary spring stretches, the limiting protruding teeth of the movable sleeve are pushed to slide upward along the limiting grooves, and the secondary springs Stretch later than the first and third springs, when the elastic force of the first and third springs drops, the movable sleeve breaks away from the limit tube, the second spring and the elastic force of the first and third springs together make the pressure of the piston on the liner per unit time in the infusion The process is smooth and even. the

The advantages of the low-level constant-pressure infusion set and its use method of the present invention are: 1. Its pressurizing device has three-stage springs, which can release the pressure evenly and ensure constant pressure during the entire infusion process; 2. It is especially suitable for large-capacity infusion sets or Long-term slow infusion; 3. The three-stage spring provides a lasting and stable pressure in a limited space, reducing the volume of the infusion set. the

(4) Description of drawings

Fig. 1 is the structure schematic diagram after the assembly of this low position uniform pressure infusion device embodiment;

Fig. 2 is a schematic diagram of the bottle structure in Fig. 1;

Fig. 3 is a schematic diagram of the inner tank structure in Fig. 1;

Fig. 4 is a schematic diagram of the structure of the movable sleeve in Fig. 1;

Figure 5 is a schematic diagram of a longitudinal section of the base in Figure 1;

Figure 6 is a schematic diagram of the three-dimensional structure of the base in Figure 1;

Figure 7 is a schematic diagram of the top view of the sliding roof in Figure 1;

Fig. 8 is A-A to sectional schematic diagram in Fig. 7;

Fig. 9 is a schematic diagram of the structure of the tie rod in Fig. 1;

Fig. 10 is a schematic diagram of the cross-sectional structure of the piston in Fig. 1;

Figure 11 is a schematic diagram of the three-dimensional structure of the piston in Figure 1;

Fig. 12 is a structural schematic diagram of the springs in a compressed state at the initial stage of use of this embodiment of the low-level equal-pressure infusion set. the

The labels in the figure are:

1. bottle body, 11. bottle mouth, 2. liner, 3. piston, 31. barrel body, 311. slot, 312. positioning block, 32. top surface, 4. sliding top plate, 41. locking teeth, 42, guide cylinder, 421, guide cylinder convex tooth, 5, pull rod, 51, locking piece, 6, three-stage spring, 7, movable sleeve, 71, inner cylinder, 711, inner cylinder convex tooth, 72, upper end plate , 721, limiting convex tooth, 8, secondary spring, 9, primary spring, 10, base, 101, bottom surface, 102, seat body, 103, spring fixing sleeve, 1031, positioning block, 104, limiting cylinder, 1041. Limiting groove. the

(5) Specific implementation methods

The embodiment of this low-level constant-pressure infusion set is shown in Figure 1, including a cylindrical bottle body 1 with a bottleneck, a compressible inner bag 2 and a pressurizing device in the bottle body 1, the inner bag 2 The outlet is connected to the bottle mouth 11, and the pressurizing device is located in the bottle body 1 and below the liner 2. The pressurizing device includes a sliding top plate 4 , an elastic return force element, a pull rod 5 and a locking member 51 . The top surface of the sliding top plate 4 is located at the bottom of the liner 2 , the top end of the pull rod 5 is connected with the sliding top plate 4 , and the bottom end is fixedly connected with a butterfly locking member 51 . the

As shown in FIG. 2 , the bottle body 1 is a cylinder with an open bottom and a bottle mouth 11 at the top. the

A base 10 is installed at the bottom of the bottle body 1 . As shown in FIGS. 5 and 6 , the base 10 includes a cylindrical seat body 102 and a bottom surface 101 sealingly connected thereto. The bottom surface 101 has a central hole. In order to protect the locking part 51 and to make the infusion set upright and stable, the seat body 102 of the base 10 extends downward from the bottom surface 101 , and the extended length is slightly longer than the length of the locking part 51 at the bottom of the pull rod 5 . The outer diameter of the seat body 102 is slightly smaller than the inner diameter of the bottle body 1. The inner wall of the lower end of the bottle body 1 has a convex ring, and the outer wall of the seat body 102 has an annular groove matching it. When the seat body 102 is inserted into the bottle body 1 from below, the inner wall of the bottle body 1 The protruding ring is embedded in the annular groove of the outer wall of the seat body 102, and the two are connected. The bottom surface 101 in the seat body 10 is also fixed with a limit tube 104 concentric with the seat body 102 and a spring fixing sleeve 103, the limit tube 104 is in the innermost layer, and the limit tube 104 and the spring fixing sleeve 103 have the same height. There are four slanting downward limiting grooves 1041 on the upper end of the inner wall of the limiting cylinder 104, and the bottom of the limiting grooves 1041 is an upward non-return groove. The outer wall of the spring fixing sleeve 103 has four raised positioning blocks 1031 . the

As shown in Figure 4, the movable sleeve 7 is terminated with an annular upper end plate 72, the inner diameter of the upper end plate 72 is equal to the inner diameter of the movable sleeve 7, and the outer diameter is slightly smaller than the inner diameter of the limit tube 104; the outer edge of the upper end plate 72 of the movable sleeve 7 is folded down ; Form an annular card slot with an opening downward. The movable sleeve 7 lower ends connect the annular lower end plate, and the lower end plate outer diameter is equal to the movable sleeve 7 inner diameters, and the inner diameter is slightly larger than the pull rod 5 diameters, and the upper and lower end plates are perpendicular to the movable sleeve 7 centerlines. On the outer edge of the upper end plate 72 of the movable sleeve 7, there are 4 limiting teeth 721 matched with the limiting groove 1041 on the inner wall of the limiting cylinder 104. When the movable sleeve 7 is loaded into the limiting cylinder 104, its limiting convex teeth 721 is embedded in the limit groove 1041 on the inner wall of the limit cylinder 104, the movable sleeve 7 moves down while rotating, and with the rotation of the movable sleeve 7, its limit protruding tooth 721 snaps into the non-return position at the bottom of the limit groove 1041. in the slot. The lower end plate of the movable sleeve 7 is connected to the inner cylinder 71 concentric with it. The inner diameter of the inner cylinder 71 is larger than the outer diameter of the pull rod 5, the outer diameter is smaller than the inner diameter of the three-stage spring 6, and its height is 2/3 to 1 of the height of the movable sleeve 7. /2. There are two inner cylinder protruding teeth 711 on the upper edge of the inner cylinder 71 . the

As shown in Figures 10 and 11, the piston 3 is an inverted cylinder, the top surface 32 is located below the liner 2 and matches the bottom surface of the liner, and the outer diameter of the top surface 32 is slightly smaller than the inner diameter of the bottle body 1 . The inner diameter of the barrel body 31 is slightly larger than the outer diameter of the spring fixing sleeve 103, but smaller than the outer diameter of the positioning block 1031 on the outer wall of the spring fixing sleeve 103. The lower edge of the barrel body 31 of the piston 3 has 4 draw-in grooves matched with the positioning block 1031 on the outer wall of the spring fixing sleeve 103 . When the piston 3 was buckled on the spring fixed sleeve 103 of the base 10, the draw-in groove 311 on the lower edge of the barrel body 31 of the piston 3 was inserted into the positioning block 1031 of the spring fixed sleeve 103, so that the total height of the piston 3 and the base 10 was determined. The space height of the bottle body 1 above the piston 3 is the height after the inner tank 2 is filled with medicinal liquid. There are two locking blocks 312 below the inner wall of the barrel body 31 of the piston 3 . the

As shown in Figures 7 and 8, the long diameter of the sliding top plate 4 is slightly smaller than the inner diameter of the barrel body 31 of the piston 3, and the outer edge of the long diameter has two locking teeth 41 matched with the locking stopper 312 on the inner wall of the barrel body 31 of the piston 3. . The center of the bottom of the sliding top plate 1 is connected with the guide cylinder 42. The outer diameter of the guide cylinder 42 is less than the inner diameter of the three-stage spring 6, and its height is 1/3 to 1/2 of the height of the movable sleeve 7. The inner hole is threaded with the pull rod 5. Screw hole, the pull rod 5 is screwed into the guide cylinder 42 to be connected with the sliding top plate 4 . The bottom edge of the sliding top plate 4 guiding cylinder 42 has 2 guiding cylinder convex teeth 421 matched with the inner cylinder convex tooth 711 of the movable sleeve 7 . When the sliding top plate 4 is pressed against the upper end plate 72 of the movable sleeve 7 , the guide cylinder protruding teeth 421 of the sliding top plate 4 and the inner cylinder protruding teeth 711 of the movable sleeve 7 are engaged with each other. The outer wall of the guide cylinder 42 is evenly distributed with 6 protruding retaining bars parallel to the center of the pull rod, and the outer peripheral diameter of the retaining bars is equal to the inner diameter of the three-stage spring 6 . The outer edge of the sliding top plate 4 has a positioning groove 43 . the

As shown in Figure 9, the pull rod 5 is a screw rod matched with the screw hole of the guide cylinder 42 of the sliding top plate 4, and the length of the pull rod 5 is equal to the distance between the bottom surface 101 of the base 10 and the top surface 32 of the piston 3 installed on the spring fixing sleeve 103 of the base 10. distance. The lower end of the pull rod 5 passes through the central hole of the movable sleeve 7 and the bottom surface 101 of the base 10 , and the locking member 51 is located below the bottom surface 10 . the

As shown in FIGS. 1 and 12 , the elastic return force element includes three cylindrical coil springs with different diameters centered on the pull rod 5 . The first-stage spring 9 with the largest diameter on the outermost layer is located between the spring fixing sleeve 103 and the limit cylinder 104, the lower end is against the bottom surface 101 of the base 10, and the upper end is inserted into the positioning groove 43 on the outer edge of the sliding top plate 4; The stage spring 8 is located between the limit tube 104 and the movable sleeve 7, its lower end is against the bottom surface 101 of the base 10, and its upper end is inserted into the annular groove folded down by the upper end plate 72 of the movable sleeve 7, and is against the upper end plate 72; The three-stage spring 6 is set outside the pull rod 5 and is located outside the inner cylinder 71 of the movable sleeve 7. The lower end of the three-stage spring is against the lower end plate of the movable sleeve 4, and the upper end is tightly bound outside the retaining strip of the guide cylinder 42, and is connected with the sliding top plate. 4 connections. the

In order to connect the base firmly with the bottle body, a safety snap ring is also designed. The safety snap ring is an annular sleeve whose inner diameter is equal to the outer diameter of the bottle body 1. There is an annular groove on the outer wall of the lower end of the bottle body 1. The seat body 102 of the base 10 has a convex The inner wall of the insurance snap ring has a corresponding convex ring and an annular groove. After the base 10 is inserted into the bottle body 1, the safety snap ring is sleeved on the junction of the base 10 and the bottle body 1. The convex ring and the annular groove of the insurance snap ring are engaged with the annular groove of the bottle body 1 and the convex ring of the base 10 respectively, and the base 10 is firmly connected with the bottle body 1 . the

In order to ensure the safety of infusion under sports conditions, the bottle mouth of the infusion set has a bottle mouth holder, and there is a card slot on it that matches the liquid-taking plug of the infusion tube. The holder fits over the mouth of the bottle to prevent the plug from falling off. In addition, it is equipped with a buckle of the infusion governor, which is matched with the shell of the governor. After the infusion speed is properly adjusted, the buckle is installed on the governor, and the adjustment wheel no longer rotates, and the infusion speed remains unchanged. the

In order to facilitate positioning in various situations, this medical low-level uniform pressure infusion set is also equipped with a hanging ring on the bottle body. The hanging ring is a ring sleeve whose inner diameter is equal to the outer diameter of the bottle. 1 elastic clamp, and/or 1-2 hooks, and/or 1-3 lifting rings. The elastic clamp is used to fix the drop bottle on the infusion tube, the hook can be used to hang the infusion set on a belt or other places, and the hanging button can be used to hook the rope to hang the infusion set. the

The method of using the low-level uniform pressure infusion set in the above example is as follows:

I. Assembly

When assembling the low-level equal-pressure infusion set, the liner 2 is put into the bottle body 1, and the opening of the liner 2 is fixedly connected with the bottle mouth 11 of the bottle body 1. After the liner 2 is filled with liquid medicine, the opening of the liner 2 is sealed. and bottle mouth 11 . Hanging ring 12 is enclosed within on the bottle body 1. the

Put the secondary spring 8 in the limit tube 104 of the base 10, the movable sleeve 7 is pressed on the secondary spring 8, and the upper end of the secondary spring 8 is embedded in the annular groove folded down by the upper end plate 72 of the movable sleeve 7, The movable sleeve 7 enters the limit cylinder 104 during counterclockwise rotation, and simultaneously compresses the secondary spring 8, and the limit protruding tooth 721 on the outer edge of the upper end plate 72 of the movable sleeve 7 is along the limit groove 1041 on the inner wall of the limit cylinder 104 Moving down, with the counterclockwise rotation of the movable sleeve 7, the limiting protruding tooth 721 snaps into the check groove, and the secondary spring 8 is compressed between the bottom surface 101 of the base 10 and the upper end plate 72 of the movable sleeve 7. After that, the upper end of the first-stage spring 9 is inserted into the positioning groove 43 on the sliding top plate 4, and the upper end of the third-stage spring 6 is hooped outside the guide tube 42 of the sliding top plate 4. The lower end of the third-stage spring 6 is put into the movable sleeve 4 and is sleeved outside the inner tube 71, the lower end of the first-stage spring 9 is placed between the spring fixing sleeve 103 and the limit cylinder 104, and the bottom end is connected to the pull rod 5 of the locking member 51 by the base 10. Insert below, its top is screwed in the screw hole of sliding top plate 4 guide cylinder 42, piston 3 is buckled on the base 10, and the draw-in groove 311 of piston 3 barrel body 31 lower edges is stuck in the positioning block 1031 of spring fixed sleeve 103. Base 10 and its spring, sliding top plate 4, movable sleeve 7 and piston 3 are inserted into bottle body 1 from the bottom together, and the convex ring of bottle body 1 inner wall is embedded in the annular groove of base 10 seat body 102 outer wall, and the two are connected. The infusion set is assembled and ready for use. the

When equipped with a safety snap ring, then put the safety snap ring on the junction of the base 10 and the bottle body 1, the convex ring and the annular groove of the safety snap ring are connected with the annular groove of the bottle body 1 and the convex ring of the base 10 respectively. The base 10 is firmly connected with the bottle body 1 by being snapped together. the

At this time, as shown in Figure 1, the sliding top plate 4 is at the top of the pull rod 5, close to the top surface 32 of the piston 3, the locking member 51 at the tail end of the pull rod 5 is close to the bottom surface 101 of the base 10, and the first and third stage springs 9, 6 are in an extended state. , the secondary spring 8 is in a compressed state. the

II. Use of infusion

The liquid of the infusion tube is inserted into the liner 2 from the bottle mouth 11 of the infusion set, the pull rod 51 is pulled downwards and rotated at the same time, the sliding top plate 4 at the top presses down the first and third stage springs 9, 6, and reaches the clamping position on the outer edge of the sliding top plate 4. The position tooth 43 blocks the stop block 311 of the inner wall of the piston 3 barrel body 31, and simultaneously slides the guide cylinder convex teeth 421 of the top plate 4 guide cylinder 42 and the inner cylinder convex teeth 711 of the movable sleeve 7 inner cylinder 71 to mesh with each other, slide The top plate 4 drives the movable sleeve 7 to rotate clockwise, and the limiting protruding tooth 721 on the outer edge of the upper end plate 72 of the movable sleeve 7 leaves the check groove of the limiting cylinder 104 and is at the bottom of the limiting groove 1041 . Sliding top plate 4 is restricted and can no longer rotate, and continues to rotate pull bar 4, and sliding top plate 4 fully compresses three springs 6,8,9, and pull bar 5 upper ends are unscrewed from sliding top plate 4, to push to piston 3 top surface 32. Continue to use force to make the locking member 51 fall off from the pull rod 5, the tail end of the pull rod 5 has no resistance, and the three springs 6, 8, 9 stretch simultaneously, as shown in Figure 12 at this time. The elastic force pushes the movable top plate 4 and the pull rod 5 upwards, and the top of the pull rod 5 pushes against the top surface 32 of the piston 3 to move upwards, the piston 3 presses the inner container 2, and the elastic force is transmitted to the bottom of the inner container 3 smoothly and evenly. Because the limit protruding tooth 721 of the upper end plate 72 of the movable sleeve 7 is embedded in the limit groove 1041 of the inner wall of the limit cylinder 104, when the secondary spring 8 stretches, the limit protruding tooth 721 of the movable sleeve 7 is pushed along the limit groove. Slot 1041 slides upwards, and the extension of secondary spring 8 is later than that of first and third stage springs 9,6. When the elastic force of first and third stage springs 6,9 drops, movable sleeve 7 breaks away from limit tube 104, and the extension of secondary spring 8 The elastic force is used as a supplement to make the pressure of the piston 3 on the inner tank 2 units of time stable and even during the infusion process. the

The above-mentioned embodiments are only specific examples for further specifying the purpose, technical solutions and beneficial effects of the present invention, and the present invention is not limited thereto. Any modifications, equivalent replacements, improvements, etc. made within the disclosed scope of the present invention are included in the protection scope of the present invention. the

Claims (8)

1. Medical low-level uniform pressure infusion set, comprising a cylindrical bottle body (1) with a bottleneck, a compressible inner tank (2) that can hold medicinal liquid in the bottle body (1) and a filling Pressing device, the outlet of the inner tank (2) is connected to the bottle mouth (11), and the pressurizing device is located in the bottle body (1) and below the inner tank (2); the pressurizing device includes a sliding top plate ( 4), elastic resilience element, pull rod (5) and locking member (51); the top surface of the sliding top plate (4) is located at the bottom of the liner (2), and the top of the pull rod (5) is connected with the sliding top plate (4), The bottom end is fixedly connected to the locking member (51); it is characterized in that: There are also a base (10), a movable sleeve (7) and a piston (3), and the elastic return force element includes a primary spring (9), a secondary spring (8) and a tertiary spring (6); The base (10) is installed on the bottom of the cylinder of the bottle body (1), and the base (10) includes a cylindrical seat body (102) and a bottom surface (101) sealingly connected with it, the bottom surface (101) has a central hole, and the seat The outer diameter of body (102) is slightly smaller than bottle body (1) inner diameter, and also be fixed with the limiting cylinder (104) of seat body (102) concentric axis and the spring fixing on the bottom surface (101) in seat body (102). Sleeve (103), limit tube (104) is in the innermost layer, limit tube (104) and spring fixing sleeve (103) are of the same height; limit tube (104) inner wall upper end has 3～6 limit Position groove (1041), the bottom of the limit groove (1041) is a horizontal or oblique upward non-return groove; the outer wall of the spring fixing sleeve (103) has 3 to 6 raised positioning blocks (1031); The movable sleeve (7) is terminated with an annular upper end plate (72), and the inner diameter of the upper end plate (72) is equal to the inner diameter of the movable sleeve (7), and the outer diameter is slightly smaller than the inner diameter of the stopper (104); the movable sleeve ( 7) The lower end is connected to the annular lower end plate, the outer diameter of the lower end plate is equal to the inner diameter of the movable sleeve (7), the inner diameter is slightly larger than the diameter of the pull rod (5), the upper and lower end plates are perpendicular to the center line of the movable sleeve (7); the movable sleeve ( 7) The outer edge of the upper end plate (72) has 3 to 6 limiting protruding teeth (721) matching the limiting grooves (1041) on the inner wall of the limiting cylinder (104). When installing the position cylinder (104), its position-limiting protruding teeth (721) are embedded in the position-limiting grooves (1041) on the inner wall of the position-limiting cylinder (104), and during assembly, its position-limiting protruding teeth (721) snap into the position-limiting grooves ( 1041) in the check groove at the bottom; the lower end plate of the movable sleeve (7) is connected to the concentric inner cylinder (71), the inner diameter of the inner cylinder (71) is larger than the outer diameter of the pull rod (5), and the outer diameter is smaller than that of the three-stage spring (6) inner diameter, its height is 2/3 to 1/2 of the height of the movable sleeve (7), and there are 2 to 4 inner cylinder convex teeth (711) on the upper edge of the inner cylinder (71); The piston (3) is an inverted cylinder, the top surface (32) is located below the inner container (2) and matches the bottom surface of the inner container (2), and the outer diameter of the upper surface (32) is slightly smaller than the inner diameter of the bottle body (1) The barrel body (31) inner diameter is slightly larger than the outer diameter of the spring fixing sleeve (103), less than the outer diameter of the spring fixing sleeve (103) outer wall positioning block (1031); 3 to 6 draw-in grooves matched with the outer wall positioning block (1031) of the sleeve (103); when the piston (3) is buckled on the spring fixing sleeve (103) of the base (10) during assembly, the piston (3) barrel body (31 ) the slot (311) on the lower edge is snapped into the positioning block (1031) of the spring fixing sleeve (103), and the space height of the bottle body (1) above the piston (3) is the height of the inner tank (2) after it is filled with liquid medicine ; There are 2 to 4 locking blocks (312) under the inner wall of the barrel body (31) of the piston (3); The long diameter of the sliding top plate (4) is slightly smaller than the inner diameter of the piston (3) barrel (31), and the outer edge of the long diameter has a stopper (312) that matches the inner wall of the piston (3) barrel (31). 2 to 4 locking teeth (41); the center of the bottom of the sliding top plate (4) is connected to the guide cylinder (42), and the outer diameter of the guide cylinder (42) is smaller than the inner diameter of the three-stage spring (6), and its height is equal to that of the movable sleeve (7 ) height of 1/3 to 1/2, its inner hole is a screw hole, and the pull rod (5) is screwed into the guide cylinder (42) to be connected with the sliding top plate (4); the bottom edge of the sliding top plate (4) guide cylinder (42) There are 2 to 4 guide cylinder convex teeth (421) matched with the inner cylinder convex teeth (711) of the movable sleeve (7); when the sliding top plate (4) is pressed against the upper end plate (72) of the movable sleeve (7), On the top, the convex teeth (421) of the guide cylinder of the sliding top plate (4) and the convex teeth (711) of the inner cylinder of the movable sleeve (7) mesh with each other; Described pull rod (5) is the screw rod that cooperates with sliding top board (4) guide tube (42) screw hole, and pull rod (5) length is equal to base (10) bottom surface (101) to be installed on base (10) spring fixed sleeve ( 103) the distance between the piston (3) top surface (32); The primary spring (9) is located between the spring fixing sleeve (103) and the limit cylinder (104), the lower end is against the bottom surface (101) of the base (10), and the upper end is connected with the sliding top plate (4); the secondary spring (8) Located between the limit tube (104) and the movable sleeve (7), its lower end is against the bottom surface (101) of the base (10), and its upper end is against the upper end plate (72) of the movable sleeve (7); The tertiary spring (6) is enclosed within the pull bar (5), outside the inner tube (71) of the movable sleeve (7), the lower end of the tertiary spring is against the lower end plate of the movable sleeve (4), and the upper end and the sliding top plate ( 4) Connect. 2. The medical low-level uniform pressure infusion set according to claim 1, characterized in that: There is a positioning groove (43) on the outer edge of the sliding top plate (4), and the upper end of the primary spring (9) is inserted into the positioning groove (43) on the outer edge of the sliding top plate (4). 3. The medical low-level uniform pressure infusion set according to claim 1, characterized in that: The outer edge of the upper end plate (72) of the movable sleeve (7) is folded down to form an annular slot with an opening downward; the upper end of the secondary spring (8) is inserted into the annular slot and abuts against the upper end plate (72). 4. The medical low-level uniform pressure infusion set according to claim 1, characterized in that: The outer wall of the guide cylinder (42) of the sliding top plate (4) is evenly distributed with 3 to 8 protruding retaining strips parallel to the center of the pull rod (5), and the outer peripheral diameter of the retaining strips is equal to the inner diameter of the third-stage spring (6); The upper end of the spring (6) is tightly bound outside the retaining bar of the guide cylinder (42). 5. The medical low-level uniform pressure infusion set according to claim 1, characterized in that: The locking piece (51) at the bottom end of the pull rod (5) is a butterfly locking piece. 6. The medical low-level uniform pressure infusion set according to claim 1, characterized in that: The seat body (102) of the base (10) extends downward from the bottom surface (101), and the extended length is slightly longer than the length of the locking part (51) at the bottom of the pull rod (5). 7. The medical low-level uniform pressure infusion set according to claim 1, characterized in that: The lower end of the inner wall of the bottle body (1) has a convex ring, the outer wall of the seat body (102) of the base (10) has an annular groove matched therewith, and the convex ring on the inner wall of the bottle body (1) is embedded in the outer wall of the seat body (102). In the annular groove, the two are connected. 8. The assembly method of the medical low-level uniform pressure infusion set according to any one of claims 1 to 7, characterized in that: When the low-level constant-pressure infusion set is assembled, the liner (2) is put into the bottle (1), the opening of the liner (2) is fixedly connected to the mouth (11) of the bottle (1), and the liner (2) ) after filling the liquid medicine, seal the opening and the bottle mouth (11) of the liner (2); Put the secondary spring (8) in the limit cylinder (104) of the base (10), the movable sleeve (7) is pressed on the secondary spring (8), and the movable sleeve (7) enters the limit cylinder during rotation (104) compresses the secondary spring (8) at the same time, and the limiting protruding tooth (721) on the outer edge of the upper end plate (72) of the movable sleeve (7) is along the limiting groove (1041) on the inner wall of the limiting cylinder (104) ) moves down, and with the rotation of the movable sleeve 7, the limiting protruding teeth (721) are locked into the check groove, and the secondary spring (8) is compressed between the bottom surface (101) of the base (10) and the movable sleeve (7 ) between the upper end plates (72); after that, connect the upper end of the first-stage spring (9) with the sliding top plate (4), and the upper end of the third-stage spring (6) is hooped outside the guide cylinder (42) of the sliding top plate (4), The lower end of the tertiary spring (6) is put into the movable sleeve (4) and sleeved outside the inner tube (71), and the lower end of the first-level spring (9) is put between the spring fixing sleeve (103) and the limit cylinder (104). The bottom end is connected to the pull rod (5) of the lock piece (51) by inserting from the bottom of the base (10), and its top is screwed into the screw hole of the sliding top plate (4) guide cylinder (42); the piston (3) is buckled on the base (10) ), the slot (311) on the lower edge of the barrel body (31) of the piston (3) is engaged in the positioning block (1031) of the spring fixing sleeve (103); the base (10) and its first-stage spring (6), second The first stage spring (8), the third stage spring (9), the sliding top plate (4), the movable sleeve (7) and the piston (3) are inserted into the bottle body (1) from the bottom together, and the base (10) and the bottle body (1) connect.

Images