CN215961492U

CN215961492U - Injection head for high-pressure injector

Info

Publication number: CN215961492U
Application number: CN202122208582.0U
Authority: CN
Inventors: 堀信一; 堀笃史; 五十岚光夫; 五十岚亮莱昂纳多; 宫田智治
Original assignee: Apollo Rt Co ltd; Kosmick ME; Clinical Support Co ltd
Current assignee: Apollo Rt Co ltd; Kosmick ME; Clinical Support Co ltd
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2022-03-08
Anticipated expiration: 2031-09-13
Also published as: WO2023036337A1

Abstract

The utility model relates to an injection head for a high-pressure injector, comprising: a housing: a frame supported inside the housing; a motor mounted to the frame; an encoder provided on the frame so as to be located laterally of the motor in a horizontal direction; a screw assembly disposed on the frame in a manner of being located obliquely below the motor; and a synchronous belt transmission mechanism for transmitting the power of the motor to the screw rod assembly; the screw rod assembly comprises a screw rod which is freely inserted into the rack in a rotating manner, a moving piece which drives a rubber plug of the injector along the axial direction of the screw rod when the screw rod rotates, and a sliding rail which supports the moving piece; the front end of the shell is provided with a clamping jaw for clamping a syringe of the injector and a bracket for supporting the syringe injector. The utility model has simple structure, compact structure and miniaturization, and can drive the high-pressure injection head to inject the contrast medium with low flow and high precision.

Description

Injection head for high-pressure injector

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an injection head for a high-pressure injector.

Background

The contrast agent is one of the most commonly used medicines in interventional radiology operation, is mainly used for displaying blood vessels and body cavities, and improves the accuracy of diagnosis. The contrast agents are various, and most of the contrast agents currently used in interventional radiology are iodine-containing preparations. The amount of contrast agent is an independent risk factor for causing contrast-induced nephropathy. Cigarrooa et al propose a formula for calculating the amount of contrast agent: 5ml × body weight (Kg)/Cr (mg/dl), the maximum amount is not more than 300 ml. Studies have shown that the incidence of contrast-induced nephropathy is 21% -37% over threshold dose, and 0% -2% without threshold crossing. The incidence and severity of the physical-chemical reaction are related to the amount of the contrast agent, and the osmotic pressure of the current commonly used contrast agent is obviously higher than that of blood by 2-5 times, so that various damages are easily generated, and the reduction of the dosage of the contrast agent is beneficial to patients.

In practice, conventional high-pressure angiographic injectors inject large doses and high flow rates through the injector head, and the patient often has to ingest an unnecessarily large dose of contrast media. When the micro-catheter is used together with a micro-catheter, the imaging failure is often caused by the control precision and the structure of a syringe when low-flow-rate and small-dose injection is adopted. The existing injection head for the high-pressure injector is internally provided with a screw rod structure through the output end of a driving piece, so that a push rod connected to a needle cylinder piston is driven to reciprocate, the volume of the existing injection head is often large, and the existing injection head occupies a large space and is not beneficial to operation.

SUMMERY OF THE UTILITY MODEL

Problem that utility model will solve:

in view of the above problems, an object of the present invention is to provide an injection head for a high-pressure syringe that is compact and small in size and can inject a contrast medium at a low flow rate with high accuracy.

The technical means for solving the problems are as follows:

in order to solve the above problems, the present invention provides an injection head for a high pressure syringe, the injection head comprising: a housing: a frame supported inside the housing; a motor mounted to the frame; an encoder provided on the frame so as to be located laterally of the motor in a horizontal direction; a screw assembly disposed on the frame in a manner of being located obliquely below the motor; and a synchronous belt transmission mechanism for transmitting the power of the motor to the screw rod assembly; the screw rod assembly comprises a screw rod which is freely inserted into the rack in a rotating manner, a moving piece which drives a rubber plug of the injector along the axial direction of the screw rod when the screw rod rotates, and a sliding rail which supports the moving piece; the front end of the shell is provided with a clamping jaw for clamping a needle cylinder of the injector and a bracket for supporting the needle cylinder.

According to the utility model, the screw rod assembly is arranged below the motor side, and transmission is carried out through the synchronous belt transmission mechanism, so that the occupied space can be effectively reduced, the size of the injection head main body is reduced, and the injection head main body is miniaturized. The injector and the injection head can form a whole by arranging the clamping jaws and the bracket at the front end of the shell, and the injector can be conveniently disassembled and assembled by opening and closing the clamping jaws.

In the utility model, the moving member is composed of a screw nut arranged on the screw rod and a push rod connected with the screw nut; the push rod is sleeved on the outer side of the screw rod and is inserted through the front end of the shell in a sliding manner. Through setting up lead screw and screw-nut as an organic whole, can shorten structural length.

In the present invention, the moving member may further include a slider, and the lead screw nut may be slidably supported by the slide rail through the slider; and a guide rod for guiding the sliding block is arranged on the sliding rail.

In the present invention, the synchronous belt transmission mechanism may include a first synchronous gear provided at a distal end of the output shaft of the motor, a second synchronous gear provided at a rear portion of the lead screw, and a belt drivingly connecting the first synchronous gear and the second synchronous gear. Therefore, accurate and stable power transmission is realized.

In the present invention, the synchronous belt drive mechanism may further include a tension pulley provided to the frame.

In the present invention, the end of the screw rod may extend from the rear end of the housing and may be provided with a knob. Therefore, the screw rod can be manually driven to rotate, and the high-pressure injector can be detached from the injection head under the condition that the equipment is powered off.

In the present invention, the sensor seat may be provided on the bracket; and the sensor seat is provided with a bubble sensor. Thereby, a bubble sensor for detecting whether or not bubbles exist in the pipe can be installed, and the bubble sensor can also play a role of fixing the pipe.

In the present invention, the upper portion of the housing may be formed in a step shape having an inclined surface inclined rearward; the top of the shell is provided with a stop key, and the inclined surface is provided with a control button used for controlling the push rod to move back and forth. Thereby effectively reducing the height of the injection head.

In the utility model, the injection head is also provided with a power supply box; and the control circuit of the injection head is arranged in the power supply box. Through setting up the master control circuit board in the power supply box, can reduce the interior subassembly of injection head to practice thrift the interior space and make it compacter.

In the present invention, a handle may be disposed on one side of the housing.

The utility model has the advantages that:

the utility model has simple structure, compact structure and miniaturization, and can drive the high-pressure injection head to inject the contrast medium with low flow and high precision.

Drawings

FIG. 1 shows a perspective view of an injector head for a high pressure syringe loaded with a high pressure syringe according to an embodiment of the present invention;

FIG. 2 shows a top view of an injector head for a high pressure syringe loaded with a high pressure syringe according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line W-W of the injection head for the high pressure syringe of FIG. 2;

FIG. 4 is a sectional view taken along line A-A of the injection head for the high pressure syringe of FIG. 2;

FIG. 5 shows a high pressure syringe assembly provided with an injection head for the high pressure syringe of FIG. 1;

description of the symbols:

100. an injection head; 11. a lower housing; 12. an upper housing; 20. a frame; 30. a motor; 41. a first synchronizing gear; 42. a second synchronizing gear; 43. a belt; 50. an encoder; 61. a screw rod; 62. a feed screw nut; 63. a push rod; 63a, a putter head; 64. a slider; 64a, a guide rod; 65. a slide rail; 66. a knob; 71. a clamping jaw; 72. a bracket; 72a, a key; 73. a sensor seat; 74; a support bar; 81. a PCB circuit board; 82. a fast forward key; 83. a jog key; 84. a stop key; 90. a handle; 91. a hand guard plate; 200. a high pressure syringe; 210. a needle cylinder; 220. a rubber plug; 300. a contrast agent conduit; 310. a three-way joint; 311. a bubble sensor; 312. a bubble sensor; 400. and (4) inserting a bottle needle.

Detailed Description

The present invention is further described below in conjunction with the following embodiments and the accompanying drawings, it being understood that the drawings and the following embodiments are illustrative of the utility model only and are not limiting thereof.

Disclosed herein is an injection head for a high-pressure syringe (hereinafter referred to as "injection head") which is compact and can inject a contrast medium at a low flow rate and with high accuracy. Fig. 1 is a perspective view of an injection head 100 for a high-pressure syringe loaded with a high-pressure syringe 200 according to an embodiment of the present invention, and fig. 2 is a plan view of the injection head 100 for a high-pressure syringe. Here, the direction in which the injection head pushes the high-pressure syringe to inject the contrast medium is defined as "front", the direction in which the injection head pulls the high-pressure syringe to suck the contrast medium is defined as "rear", and the directions "up", "down", "left" and "right" are defined as "up", "down", "left" and "right" when the injection head is viewed from the rear. It should be noted that the orientation or positional relationship in the description of the present invention is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

As shown in fig. 1 and 2, the injection head 100 is used in cooperation with a high pressure syringe 200, and specifically, a syringe holder for mounting the high pressure syringe 200 is disposed at the front portion of the injection head 100, and a moving member inside the injection head 100 is connected to a plug 220 of the high pressure syringe 200, so as to convert an output of a motor 30, which will be described later, as a driving member into a linear motion, and drive the plug 220 to reciprocate, thereby extracting or injecting a contrast medium.

Fig. 3 and 4 are sectional views of the injection head 100, fig. 3 is a sectional view of the injection head 100 for a high-pressure syringe in the direction W-W, and fig. 4 is a sectional view of the injection head 100 for a high-pressure syringe in the direction a-a. The detailed structure of injector head 100 is described below with reference to fig. 4. As shown in fig. 3 and 4, the injector head 100 includes an injector head body and an injector holder.

[ injection head body ]

The injection head main body is mainly used for driving the rubber plug 220 of the high-pressure injector 200 to reciprocate at a specified speed, and comprises a shell, a rack 20, a motor 30, a synchronous belt transmission mechanism and a screw rod assembly.

The housing is a housing of the injector head main body, and in the present embodiment, the housing is composed of the lower housing 11 and the upper housing 12, but the present invention is not limited thereto, and may be formed in another structure such as a front-rear split type. As shown in fig. 2, 3, and 4, a large diameter through hole through which a push rod 63 described later is extended is formed in the center of the front end of the lower case 11, and small diameter through holes through which support rods 74 described later are extended are formed on both sides of the through hole. The cable of the injector is led out from the front part of the right side of the lower housing 11 and connected to a power box (not shown) for distributing power to the injector. On the other hand, a handle 90 for manually adjusting the position of the injection head 100 is mounted at the left middle portion through a finger guard plate 91. Further, although not shown, a lever member for connecting the bedside frame may be provided on the right side of the lower case 11. The upper case 12 is formed in a step shape having an inclined surface inclined rearward. On this inclined surface are provided control buttons for controlling the forward and backward movement of the pusher 63 in the injector head 100, including a fast forward key 82 and a slow forward key 83. The provision of the inclined surface enables the control buttons to be seen when the syringe 100 is erected for inhalation and evacuation, as compared with the case where the control buttons are provided on the top of the upper case 12, thereby facilitating the operation. Furthermore, by providing the control buttons on the front side of the upper housing 12, the height of the injection head can be effectively reduced. In addition, a stop key 84 for stopping the syringe 100 is provided on the top of the upper housing 12.

The frame 20 is provided inside the housing, and is mainly used to mount and support a motor 30, a synchronous belt drive mechanism, and a screw assembly, which will be described later. The frame 20 is formed with a plurality of through holes including a first through hole for disposing the motor 30 and a second through hole for disposing the lead screw assembly, wherein the second through hole is formed below the first through hole.

The motor 30 is the drive unit for the injection head and may be, for example, a high precision motor with its own planetary gear reduction gearbox. As shown in fig. 4, the motor 30 is provided in the frame 20 such that an output shaft is inserted through the first through hole, and a first synchronizing gear 41 in a later-described synchronous belt drive mechanism is provided at a distal end of the output shaft, i.e., an end remote from the motor 30. An encoder 50 is provided on a lateral side of the motor 30 in the horizontal direction, a gear is provided at a rear portion of the encoder 50, and the encoder 50 calculates a stroke of the motor 30 by transmission of the gear.

The screw assembly is a ball screw mechanism for converting the rotation output from the motor 30 into a linear motion, thereby driving the rubber plug 220 of the high pressure syringe 200 to reciprocate. The screw assembly includes a ball screw pair constituted by a screw 61 and a moving member, and a slide rail 65 supporting the moving member. The second through hole is provided with a thrust bearing through which the screw 61 is rotatably inserted into the frame 20 and extends in the front-rear direction, and the pitch of the screw 61 may be 2mm, for example. A second synchronizing gear 42 is provided at the rear portion of the screw 61, i.e., a portion extending forward from the second through hole, and a moving member that moves in the axial direction of the screw 61, i.e., the front-rear direction when the screw 61 rotates is provided at a substantially middle portion of the screw 61. The slide rail 65 is provided on the side of the screw 61 and the moving member so as to stand from the bottom surface of the lower case 11, and a groove for fitting the moving member is formed in the slide rail 65, so that the moving member is slidably supported. The slide rail 65 is not limited to the above configuration, and may be laid horizontally on the bottom surface of the lower case 11. Thus, the screw assembly is provided to the frame 20 in the front-rear direction so as to be located below the side of the motor 30.

In the present embodiment, the moving member includes a feed screw nut 62 and a push rod 63. Specifically, the lead screw nut 62 is provided to the lead screw 61, and moves forward and backward in the axial direction thereof when the lead screw 61 rotates. As shown in fig. 3 and 4, the push rod 63 is formed in a substantially tubular structure having both ends open, the rear end thereof is fixedly connected to the feed screw nut 62, and the front end thereof is slidably inserted through a large-diameter through hole provided in the front end surface of the lower housing 11, whereby the push rod 63 can be moved back and forth in the axial direction by the feed screw nut 62. The front end of the push rod 63 is also provided with a push rod head 63a, the push rod head 63a is formed into a general cap shape, the small diameter end of the push rod 63 is inserted into the front end of the push rod 63, and the large diameter end is provided with a clamping groove clamped with the rubber plug 220 of the high-pressure injector 200, so that the rubber plug 220 can be driven to move back and forth. The moving member further includes a slider 64 fitted in the slide rail 65, and the slider 64 is integrated with the lead screw nut 62 by a fixing member such as a bolt, whereby the lead screw nut 62 is slidably supported by the slide rail 65. Further, wing holes are provided at both sides of the slider 64, in which linear bearings are fitted and a pair of guide rods 64a extending in the front-rear direction are inserted, the guide rods 64a guiding the slider 64 to prevent the slider 64 and the lead screw nut 62 from rolling within the slide rail 65.

A synchronous belt transmission mechanism for transmitting power from the motor 30 to the lead screw assembly is further provided on the frame 20. The synchronous belt transmission mechanism comprises the first synchronous gear 41 arranged at the tail end of the output shaft of the motor 30, the second synchronous gear 42 arranged at the rear part of the screw rod 61, and a belt for connecting the first synchronous gear 41 and the second synchronous gear 42 in a transmission manner, and further comprises a tension pulley arranged on the frame 20 and used for tensioning the belt. In this embodiment, the synchronous belt transmission mechanism is a synchronous belt transmission structure, the belt may be a trapezoidal or toothed synchronous belt, and the first synchronizing gear 41, the second synchronizing gear 42, and the tension pulley may be synchronous pulleys, thereby achieving accurate and stable power transmission.

In the present embodiment, the maximum rotation speed of the motor 30 can reach 169900 revolutions, and the reduction gear box with planetary gears can be 20:1, for example, and the accurate reduction gear is 81: 4. The drive ratio of the synchronous belt drive mechanism may be 20: 12. By means of integrating a 1024-per-turn high-precision encoder and a 2mm lead screw pitch, the injection precision can be theoretically controlled: 0.00413 mL. The above is only an example of the embodiment, and the present invention is not limited to this, and may be provided according to actual needs.

As described above, the screw assembly and the motor 30 are arranged in parallel, the screw assembly is arranged below and laterally to the motor 30, and the transmission is performed by the timing belt transmission mechanism, so that the size of the injector body can be reduced and the injector can be miniaturized. Further, by providing the control button or the like on the inclined surface of the upper case 12, the height of the syringe main body can be effectively reduced. The cable of the injection head is connected into the power box which is arranged separately from the injection head, and the control circuit of the injection head is externally arranged in the power box, so that the internal components of the injection head main body can be reduced, and the internal space is saved and the injection head is more compact.

[ high-pressure syringe and syringe holder ]

The high pressure syringe 200 includes a syringe 210 and a rubber stopper 52, a syringe port as a liquid output port is formed at a tip end of the syringe 210, a flange protruding radially outward is formed at a tip end of the syringe 210, and the rubber stopper 52 is engaged with the push rod head 63a and moves integrally with the push rod 63. The high pressure injector 200 is configured to remove the syringe 210 from the cradle 72 only when the plunger 220 is at the very end of the syringe 210, i.e., when the ram 64 is retracted to the rearward limit. In the present invention, the syringe 210 may be integrated with a reinforcing sleeve, and the capacity thereof may be 30 mL. By reducing the capacity of the syringe, integrating the reinforcing sleeve and the syringe and adopting medical grade high molecular material (such as PC material) for the syringe, the syringe can be ensured not to deform during injection, thereby improving the injection precision.

A pair of support rods 74 are embedded in the bottom front end of the syringe head body, specifically, in the two small-diameter through holes of the lower case 11, and a syringe holder for holding and supporting the high-pressure syringe 200 is provided on the pair of support rods 74. As shown in fig. 3 and 4, the syringe holder mainly includes a jaw 71 and a bracket 72. The holder 72 is formed in a substantially triangular shape and mainly supports the high-pressure injector 200, and has a substantially equal length to the body of the syringe 210, and a rib is formed below the flat plate-shaped holder body to increase the strength of the holder. The holder 72 is provided at its distal end with a jaw 71 for holding the high-pressure syringe 200, and the jaw 71 is formed in a substantially arch shape and has a groove portion formed on its radially inner side and having a size corresponding to the flange at the distal end of the cylinder 210, whereby the cylinder 210 can be locked when the jaw 71 is closed.

As shown in fig. 1, a sensor holder 73 is further provided on the side of the carriage 72, and the sensor holder 73 is mainly used for providing a bubble sensor 311 for detecting bubbles in the tube at the time of injection. The bubble sensor 311 is formed in a substantially clip shape, and has an opening formed at one side thereof for fitting into the pipe.

Like this, the power of the motor 30 is transmitted to the screw 61 through the synchronous belt transmission mechanism, and in the ball screw assembly formed by the screw 61 and the screw nut 62, the synchronous belt transmission mechanism drives the screw 61 to rotate, so as to drive the screw nut 62 to drive the rubber plug 220 to advance or retreat through the push rod 63, thereby realizing the injection or extraction of the contrast medium. The screw 61 may be further inserted through a rear end surface of the lower case 11 and extended rearward, and a knob 66 may be provided at a distal end of the screw 61, the knob 66 may be a manual knob manually operated, and the screw 61 may be rotated by the knob 66. In case of power failure of the device, the push rod 63 can be rotated by the manual operation knob 66 to retreat to the rear limit position, so that the rubber plug 220 moves to the tail end of the syringe 210, and the syringe 210 can be conveniently taken down from the syringe bracket.

Fig. 5 shows a high pressure syringe kit provided with an injection head 100. As shown in fig. 5, the high pressure syringe assembly includes injector head 100, high pressure syringe 200, contrast line 300, and vial insertion needle 400. Specifically, a three-way joint 310 is provided in the contrast medium line 300. The first port of the three-way joint 310 is connected to the syringe port of the high-pressure syringe 200 through a tube, the second port is connected to the needle 400 inserted into the liquid medicine bottle through a tube, the third port is connected to the micro catheter through a tube, and outputs the contrast medium to the patient through the micro catheter, and the bubble sensor 311 disposed on the sensor holder 73 also plays a role of holding and fixing the tube.

As with the bubble sensor 311 described above, a plurality of clip-shaped bubble sensors 312 are provided between the second port of the three-way joint 310 and the vial insertion needle 400. The bubble sensor 311 is mainly used to detect whether there is a bubble in the contrast medium outputted from the three-way connector 310 to the patient, and the bubble sensor 312 is mainly used to detect whether there is a bubble between the vial insertion needle 400 and the three-way connector 310, if it is detected that there is a bubble in the tube, a high level is outputted, and the injector head 100 stops injecting, preventing the bubble from being injected into the blood vessel of the human body.

The above embodiments are intended to illustrate and not to limit the scope of the utility model, which is defined by the claims, but rather by the claims, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An injection head for a high-pressure injector is characterized in that,

the injection head comprises:

a housing:

a frame supported inside the housing;

a motor mounted to the frame;

an encoder provided on the frame so as to be located laterally of the motor in a horizontal direction;

a screw assembly disposed on the frame in a manner of being located obliquely below the motor; and

a synchronous belt transmission mechanism for transmitting the power of the motor to the screw rod assembly;

the screw rod assembly comprises a screw rod which is freely inserted into the rack in a rotating manner, a moving piece which drives a rubber plug of the injector along the axial direction of the screw rod when the screw rod rotates, and a sliding rail which supports the moving piece;

the front end of the shell is provided with a clamping jaw for clamping a syringe of the injector and a bracket for supporting the syringe injector.

2. The injection head for a high-pressure syringe according to claim 1,

the moving piece consists of a screw rod nut arranged on the screw rod and a push rod connected with the screw rod nut;

the push rod is sleeved on the outer side of the screw rod and is inserted through the front end of the shell in a sliding manner.

3. The injection head for a high-pressure syringe according to claim 2,

the moving piece further comprises a sliding block, and the lead screw nut is supported on the sliding rail in a free sliding mode through the sliding block;

and a guide rod for guiding the sliding block is arranged on the sliding rail.

4. The injection head for a high-pressure syringe according to claim 1,

the synchronous belt transmission mechanism comprises a first synchronous gear arranged at the tail end of an output shaft of the motor, a second synchronous gear arranged at the rear part of the screw rod and a belt for driving and connecting the first synchronous gear and the second synchronous gear.

5. The injection head for a high-pressure syringe according to claim 1,

the synchronous belt transmission mechanism further comprises a tension wheel arranged on the rack.

6. The injection head for a high-pressure syringe according to claim 1,

the tail end of the screw rod extends out of the rear end of the shell and is provided with a knob.

7. The injection head for a high-pressure syringe according to claim 1,

the bracket is provided with a sensor seat;

and the sensor seat is provided with a bubble sensor.

8. The injection head for a high-pressure syringe according to claim 2,

the upper part of the shell is formed into a step shape with an inclined surface inclined backwards;

the top of the shell is provided with a stop key, and the inclined surface is provided with a control key used for controlling the push rod to move back and forth.

9. The injection head for a high-pressure syringe according to claim 1,

the injection head is also provided with a power box for supplying power;

and the control circuit of the injection head is arranged in the power supply box.

10. The injection head for a high-pressure syringe according to claim 1,

a handle is arranged on one side of the shell.