CN211022641U - Blood vessel access flow detector - Google Patents
Blood vessel access flow detector Download PDFInfo
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- CN211022641U CN211022641U CN201921095640.XU CN201921095640U CN211022641U CN 211022641 U CN211022641 U CN 211022641U CN 201921095640 U CN201921095640 U CN 201921095640U CN 211022641 U CN211022641 U CN 211022641U
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Abstract
The utility model relates to a blood vessel passage flow detector, which comprises an injector fixing device arranged on a frame and used for fixing an injector, a reciprocating propulsion system used for pushing and pulling an injector piston rod and a guide mechanism; the injector fixing device comprises a fixing table arranged at one end of the rack and an injector piston rod fixing mechanism positioned on the reciprocating propulsion system, the scheme can completely replace manual work to detect the blood flow of a blood vessel passage, can display the detection result in real time, avoids treatment errors caused by insufficient experience of operators, is particularly a novel mode, utilizes a standard injector specified by the state as a weighing apparatus, and then calculates to obtain real-time blood flow data through a formula.
Description
Technical Field
The invention relates to the technical field of medical clinical appliances, in particular to a blood vessel access flow detector.
Background
The incidence rate of chronic kidney diseases reaches 10.8 percent at present, and the kidney failure is a public health problem seriously harming the health of people. Government finances bear economic burden on dialysis treatment of uremia patients, and solving the problem of treatment of uremia patients is an important medical task. In addition, the number of acute renal failure caused by various causes is increasing every year, and there is a need for a bedside continuous hemofiltration treatment (renal replacement therapy). Most acute toxicities also require hemodialysis treatment.
Whether hemodialysis or continuous hemofiltration therapy for chronic renal failure, it is a prerequisite that there is a reliable vascular access and that the quality of the vascular access directly affects the dialysis and quality of life of the patient.
Dialysis registration data at home and abroad shows that 50-70% of the vascular access of a patient with chronic renal failure in the first dialysis treatment is a central venous cannula; while central venous intubation is generally used for acute kidney failure, acute poisoning and the like. Therefore, good patient management and care techniques are the basis for ensuring high quality of central venous catheters.
Assessing the patency of a central venous catheter access is the first step in performing a hemodialysis or filtration treatment, and a clear catheter is critical to achieving a treatment goal. At present, most hospitals in China generally accept and commonly use a method that nursing staff estimate the patency of a blood vessel access by means of a syringe through a manual pumping and pushing method, and whether blood flow can meet the requirements of hemodialysis or filtration is estimated through personal experience. When the caregiver assesses that blood flow is available for on-board (dialysis machine or bedside hemofilter) dialysis, special consumables (dialysis tubing and filters) connected to the machine are required for treatment. However, the operation and experience of each caregiver is not consistent and there are many subjective factors. If the subjective blood flow assessment cannot reach the flow and pressure range of the dialysis machine once the dialysis machine is operated, the machine gives an alarm, so that the treatment cannot be carried out, and the used hemodialysis consumables are scrapped. Due to the high price of matched consumables, the economic pressure of a patient is increased, and the treatment target cannot be reached.
In other words, the opening of a vascular access is common in clinical practice, and is a necessary operation especially in hemodialysis and kidney injury. In the emergency treatment, it is the current practice for patients with renal injury and renal insufficiency to require rapid vascular access for CRRT treatment to maintain life.
CRRT (continuous renal replacement therapy) is an english abbreviation for continuous renal replacement therapy. CBP (continuous blood purification); performing blood filtration by bed. Defined as a replacement of impaired renal function by a prolonged, continuous extracorporeal blood purification therapy at or near 24 hours per day.
The method is to open the large vein (generally the central vein) of the patient, first test the flow of the blood vessel, as mentioned above, at present, the medical staff estimate the blood flow by means of the injector by manual drawing and experience whether the blood flow meets the requirement of the computer, when the medical staff estimate the blood flow in the working value range of the equipment, then use the corresponding catheter to connect the machine, the venous blood outlet and the blood refilling port, and open the equipment to complete the work.
The judgment of the blood flow is crucial in the process, because the blood flow is not on-machine for dialysis, the on-machine failure can occur once the blood flow has errors, the in-vitro treatment is delayed, the selected catheter can report the waste, and the catheter is an expensive consumption device. This can have an impact on the treatment and the economic stress on the patient increases. No auxiliary device is available to reflect the flow rate of the vascular access in a considerable way, and automated visualization cannot be realized.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an instrument which solves the instability of blood flow monitoring of an access of a central venous catheter assessed due to personal experience and different operation methods.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a blood vessel access flow detector comprises an injector fixing device arranged on a frame and used for fixing an injector, a reciprocating propulsion system used for pushing and pulling a piston rod of the injector and a guide mechanism; the syringe fixing device comprises a fixing table arranged at one end of the rack and a syringe piston rod fixing mechanism positioned on the reciprocating propulsion system, and the fixing table and/or the syringe piston rod fixing mechanism are/is provided with a fastening structure for fixing the syringe; the reciprocating propulsion system is a screw propulsion device arranged on the rack through a guide mechanism, the driving end of the screw propulsion device is a sliding block, and the injector piston rod fixing mechanism is positioned on the sliding block.
Further, the fixed station is provided with the syringe breach, the axis of syringe breach is parallel with the lead screw, the lateral wall of syringe breach is provided with the otic placode slit of placing syringe overcoat otic placode, the fixed station is located frame one end, and the other end is provided with the control cabinet, the lead screw is parallel with guiding mechanism.
Further, the reciprocating propulsion system comprises: the device comprises a lead screw, a stepping motor and a shifting block, wherein the lead screw is transversely arranged on a frame; the device comprises a dial block, a stepping motor, a lead screw, a fixed table, a guide mechanism, a syringe piston rod fixing mechanism, a syringe piston rod, a push block and a stepping motor, wherein the dial block and the stepping motor are respectively positioned on two sides of the control table, two ends of the lead screw are respectively connected with the fixed table and the control table through bearings, an output shaft of the stepping motor is fixedly connected with one end of the lead screw, the dial block is connected with the guide mechanism through a sliding block, the dial block is provided with the syringe piston rod fixing mechanism, the syringe piston rod fixing mechanism comprises a piston rod
Furthermore, the fastening structure is a bulge positioned on the inner wall of the gap of the syringe, the slit of the ear plate, the gap of the piston rod or the slit of the pressing handle; the fastening structure can also be a rotatable pressure arm positioned on the fixed table, and the limiting mechanism is fixedly arranged on the rack and used for limiting two limit positions of the shifting block.
Furthermore, the device also comprises a limiting mechanism for limiting the stroke of the piston rod of the syringe; the limiting mechanism can be a touch switch, a photoelectric switch, a laser range finder or a proximity switch.
Furthermore, the proximity switches are two and are respectively positioned on two sides of the shifting block, one is positioned on one side of the fixed platform, and the other is positioned on one side of the control platform.
Furthermore, the guide mechanism is a slide rail, a slide way or a slide groove; the limiting mechanism located on one side of the console is arranged in the adjusting groove, the axis of the adjusting groove is parallel to the axis of the lead screw, and a scale is arranged on the side face of the rack.
The output end of the controller is connected with the display device and the power supply of the stepping motor respectively, and the output end of the proximity switch 7 is connected with the input end of the controller.
Furthermore, the injector is 20ml or 50ml of national standard; still include battery and pressure sensor, pressure sensor one end and blood pipe intercommunication other end and syringe entry intercommunication, pressure sensor is electronic sensor and is provided with information output terminal.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the scheme can completely replace manual work to detect the blood flow of the blood vessel passage, can display the detection result in real time, avoids treatment errors caused by insufficient experience of operators, is particularly a novel mode, utilizes a standard injector specified by the state as a main weighing instrument, and then calculates and obtains real-time blood flow data through a formula.
The device is provided with a groove for installing the syringe, the syringe is placed in the groove, the ear plate of the syringe is placed in the ear plate slit, the piston rod of the syringe is placed in the gap of the piston rod, the pressed pressing handle is clamped in the pressing handle slit to form fixation, the slide block drives the fixing mechanism of the piston rod of the syringe to move in a reciprocating mode, and the blood flow can be obtained by combining the data of the stepping motor with the data of the syringe in the moving process.
The slider is arranged on the shifting block, and the reciprocating motion of the shifting block is completed by driving the lead screw by the stepping motor and then combining the lead screw, the guide rail or the guide groove. The stepping motor for driving is arranged in the control console at one end of the frame, so that the outer tube of the syringe is fixed by the fixing console, and the piston rod of the syringe is fixed by the slide block, so that the syringe can be drawn.
The injector can also be fixed on the fixed table by using a fastening structure, the rotatable pressure arm can rotatably fix a cantilever by using a spring or a fastening bolt, when the injector needs to be pressed, the cantilever is rotated to the injector to be further fixed, and when the injector is fixed by using the bolt, the fixation can be completed by screwing the bolt. The limiting mechanism is an inductive switch used for limiting two limit positions of the shifting block, and the inductive switch can be an inductive device which can send out electronic signals, such as a touch switch, a photoelectric switch, a laser range finder or a proximity switch.
Because the types of the syringes are different and the strokes of piston rods of the syringes are also different, the induction element for controlling the shifting block is arranged in the adjusting groove and can be fixed at will according to the stroke limit position of a piston cylinder of the syringe to adapt to various distances.
The device is provided with a display structure for displaying data, mainly blood flow, the data processing is the number of turns of the stepping motor and the data of the induction switch, the data input port is used for receiving the data of the stepping motor, the induction switch, the pressure switch and the like, and the data output port is used for outputting the data of the stepping motor, the blood flow data, the pressure switch and the like, and can be used for exchanging the data for the associated equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic illustration of the present invention;
FIG. 2 is a schematic illustration of the cross-sectional structure of the present invention;
wherein: the device comprises a machine frame 1, a fixing table 11, a control table 12, an injector notch 13, a lug plate slit 14, a lead screw 2, a stepping motor 3, a shifting block 4, a piston rod notch 41, a handle pressing slit 42, a sliding rail 5, a sliding block 6, a proximity switch 7, an adjusting groove 8 and a scale 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail and fully with reference to the accompanying drawings 1 and 2.
The derivation process of the calculation method is as follows:
flow velocity V of vascular accessL
Unit time t
Speed s of the screw
VLFlow rate of vascular access (unit: ml/min)
SZInner cross-sectional area of syringe (unit: cm)2)
s rotation speed of screw (unit: ring/min)
Number of turns of N lead screw (unit: circle)
D Pitch of the screw (Unit; cm)
SXInner cross-sectional area (unit: cm) of blood vessel for opening vascular access2)；
The distance that the piston rod of the syringe moves is s, t, D, N, D
Volume of syringe piston extrusion or aspiration vpumpZ＝N*D*SZ
V blood vessel ═ VL*t
V-syringe (V-vessel)
The method has the following steps:
the flow rate of the vascular access is VL＝SZsD
The first embodiment is as follows:
after the vascular access is established, the catheter is connected with the inlet and the outlet of the injector, the injector is fixed on the frame, the device is started, the blood flow of the vascular access can be immediately obtained, the injector piston rod is drawn for 2-3 times by the device, the stable flow value of the vascular access can be obtained, and medical staff can carry out the next operation according to the value.
The device is provided with an information output port, and information can be output to the main monitor in real time through a wire and is clear on the monitor.
The vascular access flow detector comprises an injector fixing device, a reciprocating propulsion system and a guide mechanism, wherein the injector fixing device is arranged on a rack 1 and used for fixing an injector, and the reciprocating propulsion system is used for pushing and pulling a piston rod of the injector; the syringe fixing device comprises a fixing table 11 arranged at one end of the rack and a syringe piston rod fixing mechanism positioned on the reciprocating propulsion system, and the fixing table 11 and the syringe piston rod fixing mechanism are provided with fastening structures for fixing the syringe; the reciprocating propulsion system is a screw propulsion device arranged on the rack 1 through a guide mechanism, the driving end of the screw propulsion device is a sliding block 6, and the injector piston rod fixing mechanism is positioned on the sliding block 6.
Fixed station 11 is provided with syringe breach 13, the axis of syringe breach 13 is parallel with lead screw 2, the lateral wall of syringe breach 13 is provided with the otic placode slit 14 of placing syringe overcoat otic placode, fixed station 11 is located 1 one end of frame, and the other end is provided with control cabinet 12, lead screw 2 is parallel with guiding mechanism, shifting block 4 passes through slider 6 and is connected with guiding mechanism, be provided with syringe piston rod fixed establishment on shifting block 4, syringe piston rod fixed establishment is including the piston rod breach 41 of holding syringe piston rod, piston rod breach 41 lateral wall is provided with the pressure handle slit 42 of placing syringe piston rod pressure handle.
The reciprocating propulsion system comprises: a screw rod 2 transversely arranged on the frame 1, a stepping motor 3 connected with one end of the screw rod 2 and a shifting block 4 arranged on the screw rod 2; the shifting block 4 and the stepping motor 3 are respectively positioned on two sides of the control console 12, two ends of the lead screw 2 are respectively connected with the fixed platform 11 and the control console 12 through bearings, and an output shaft of the stepping motor 3 is fixedly connected with one end of the lead screw 2.
The fastening structure is a bulge positioned on the inner wall of the injector notch 13, the lug plate slit 14, the piston rod notch 41 or the pressing handle slit 42; the limiting mechanism is fixedly arranged on the rack 1 and used for limiting two limit positions of the shifting block 4.
The limiting mechanism is used for limiting the stroke of the piston rod of the syringe; the limit mechanism may be a proximity switch 7.
The two proximity switches 7 are respectively positioned on two sides of the shifting block 4, one is positioned on one side of the fixed platform 11, and the other is positioned on one side of the control platform 12.
The guide mechanism is a slide rail 5; the limiting mechanism on one side of the control console 12 is arranged in the adjusting groove 8, the axis of the adjusting groove 8 is parallel to the axis of the lead screw 2, and a scale 9 is arranged on the side face of the rack 1.
The intelligent control device is characterized by further comprising a controller, a display device, an information receiving terminal and an information input terminal, wherein the output end of the controller is connected with the display device and the power supply of the stepping motor 3 respectively, and the output end of the proximity switch 7 is connected with the input end of the controller.
The injector is a national standard 20ml injector; the technical scheme also comprises a method for calculating the blood vessel access flow, which comprises the following steps:
VL＝SZsD；
VLflow rate of vascular access (in ml/min);
SZinner cross-sectional area of syringe (unit cm)2)；
s the rotation speed (ring/min) of the screw;
d pitch of lead screw (in cm).
After the vascular access is opened, the catheter is communicated with the inlet and outlet of the injector, then the injector is placed on the injector gap 13, the injector ear plate is placed in the ear plate slit, the injector piston rod is placed in the piston rod gap 41, the pressing handle of the piston rod is placed in the pressing handle slit 42, and the proximity switch 7 in the adjusting groove 8 is moved to the position corresponding to the model of the injector.
Then the power supply of the controller is switched on, a corresponding syringe model button is pressed, the device is started, the stepping motor 3 starts to drive the lead screw 2 to rotate, the lead screw 2 drives the shifting block 4 to move on the sliding rail 5, the sliding block 6 on the shifting block 4 moves along with the shifting block and drives the piston rod of the syringe to move, and the piston rod of the syringe firstly starts to move from the inlet and outlet end (namely the bottom) of the syringe to suck blood in a blood vessel. The controller can obtain the rotating speed of the stepping motor 3 in the process of inhalation, blood flow data can be obtained through calculation, the data can be displayed on the display device, and the data can be output to other matched equipment through the data output end.
Before the injector is connected with the vascular catheter, the normal saline is used for exhausting air, so that air is prevented from entering blood circulation of a human body when blood reflows.
When the shifting block 4 continues to move to reach the movement limit of the piston rod of the injector, the approach switch 7 is triggered, the signal of the approach switch 7 is transmitted back to the controller, the controller controls the stepping motor 3 to rotate reversely, the piston rod of the injector is pushed back, and in the pushing back process, after the shifting block 4 moves to the approach switch 7 at the other end to trigger the signal, the stepping motor 3 rotates reversely again. The blood flow data is displayed continuously throughout the process.
The scale 9 is used for assisting in setting the movement limit positions of the piston rods of different types of syringes.
The controller and the display device are arranged in the console.
Example two:
the difference from the first embodiment is that a rotatable press arm is provided, which may be a part of the fastening arrangement, a rotatable press arm on the stationary table 11,
example three:
the device is different from the first embodiment in that the device further comprises a storage battery, the storage battery is arranged in the console, so that the trouble of inserting a power line is avoided, in a use scene, the environment is complex, the circuit is complex, the trouble is caused when a power supply needs to be connected, and the built-in storage battery is convenient to use.
Example four:
the difference from the first embodiment is that a pressure sensor is further provided, one end of the pressure sensor is communicated with the blood conduit, and the other end of the pressure sensor is communicated with the injector inlet, and the pressure sensor is an electronic sensor and is provided with an information output terminal. Thus, the blood pressure information can be collected and displayed on the display device, and the data can be transmitted to peripheral equipment through the data port.
Besides the above scheme, the proximity switch 7 can also be a touch switch, a photoelectric switch, a laser range finder; the sliding rail 5 may also be a slideway or a chute. A torque sensor can be additionally arranged on a power output shaft of the stepping motor 3, so that the resistance of a piston rod of the injector can be obtained, the phenomenon that the suction force or the thrust of the piston rod is too large is avoided, and overvoltage protection is formed. The corresponding information can be obtained by additionally arranging a current detection element in the circuit of the stepping motor 3, and overvoltage protection can be formed. A pressure sensing device is additionally arranged in front of the injector, and the electric signal can be input into a display device. The pressure information may be output to a main monitor along with the blood flow information, and all data may be displayed on the main monitor. The rotatable pressure arm is used for rotatably fixing a cantilever by utilizing a spring or a fastening bolt, when the injector needs to be pressed, the cantilever is rotated to the injector for further fixing, and when the injector is fixed by the bolt, the bolt is screwed to complete the fixing.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A vascular access flow detector, characterized in that: the device comprises an injector fixing device, a reciprocating propulsion system and a guide mechanism, wherein the injector fixing device is arranged on a rack (1) and used for fixing an injector, and the reciprocating propulsion system is used for pushing and pulling an injector piston rod;
the syringe fixing device comprises a fixing table (11) arranged at one end of the rack (1) and a syringe piston rod fixing mechanism positioned on the reciprocating propulsion system, and the fixing table (11) and/or the syringe piston rod fixing mechanism are/is provided with a fastening structure for fixing the syringe;
the reciprocating propulsion system is a screw propulsion device arranged on the rack (1), the driving end of the screw propulsion device is a sliding block (6), the syringe piston rod fixing mechanism is positioned on the sliding block (6), and the sliding block (6) is arranged on the rack (1) through a guide mechanism.
2. The vascular access flow meter of claim 1, wherein: fixed station (11) are provided with syringe breach (13), the axis of syringe breach (13) is parallel with lead screw (2), the lateral wall of syringe breach (13) is provided with otic placode slit (14) of placing syringe overcoat otic placode, fixed station (11) are located frame (1) one end, and the other end is provided with control cabinet (12), lead screw (2) are parallel with guiding mechanism.
3. The vascular access flow meter of claim 2, wherein: the reciprocating propulsion system comprises: a screw rod (2) transversely arranged on the frame (1), a stepping motor (3) connected with one end of the screw rod (2) and a shifting block (4) arranged on the screw rod (2); the shifting block (4) and the stepping motor (3) are respectively positioned on two sides of the control console (12), two ends of the lead screw (2) are respectively connected with the fixed platform (11) and the control console (12) through bearings, and an output shaft of the stepping motor (3) is fixedly connected with one end of the lead screw (2); the injection syringe is characterized in that the shifting block (4) is connected with the guide mechanism through a sliding block (6), a syringe piston rod fixing mechanism is arranged on the shifting block (4), the syringe piston rod fixing mechanism comprises a piston rod notch (41) for accommodating a syringe piston rod, and a pressing handle slit (42) for placing a pressing handle of the syringe piston rod is arranged on the side wall of the piston rod notch (41).
4. The vascular access flow meter of claim 3, wherein: the fastening structure is a bulge positioned on the inner wall of the injector gap (13), the lug plate slit (14), the piston rod gap (41) or the pressing handle slit (42); the fastening structure may also be a rotatable press arm on the stationary table (11).
5. The vascular access flow meter of claim 3, wherein: the limiting mechanism is used for limiting the stroke of the piston rod of the syringe; the limiting mechanism can be a touch switch, a photoelectric switch, a laser range finder or a proximity switch (7).
6. The vascular access flow meter of claim 5, wherein: the two proximity switches (7) are respectively positioned at two sides of the shifting block (4), one is positioned at one side of the fixed platform (11), and the other is positioned at one side of the control platform (12).
7. The vascular access flow meter of claim 6, wherein: the guide mechanism is a slide rail (5), a slide way or a slide groove; the limiting mechanism located on one side of the control console (12) is arranged in the adjusting groove (8), the axis of the adjusting groove (8) is parallel to the axis of the lead screw (2), and a scale (9) is arranged on the side face of the rack (1).
8. The vascular access flow monitor of any of claims 5-7, wherein: the intelligent control device is characterized by further comprising a controller, a display device, an information receiving terminal and an information input terminal, wherein the output end of the controller is connected with the display device and the power supply of the stepping motor (3) respectively, and the output end of the proximity switch (7) is connected with the input end of the controller.
9. The vascular access flow meter of claim 7, wherein: the injector is 20ml or 50ml of national standard; still include battery and pressure sensor, pressure sensor one end and blood pipe intercommunication other end and syringe entry intercommunication, pressure sensor is electronic sensor and is provided with information output terminal.
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| CN201921095640.XU CN211022641U (en) | 2019-07-15 | 2019-07-15 | Blood vessel access flow detector |
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| CN201921095640.XU CN211022641U (en) | 2019-07-15 | 2019-07-15 | Blood vessel access flow detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110251116A (en) * | 2019-07-15 | 2019-09-20 | 河北医科大学第一医院 | A kind of vascular access flow detector and its calculation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110251116A (en) * | 2019-07-15 | 2019-09-20 | 河北医科大学第一医院 | A kind of vascular access flow detector and its calculation method |
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