CN109985293B - Device for automatically recovering passage of blood withdrawal method inspection pipeline - Google Patents
Device for automatically recovering passage of blood withdrawal method inspection pipeline Download PDFInfo
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- CN109985293B CN109985293B CN201711488959.4A CN201711488959A CN109985293B CN 109985293 B CN109985293 B CN 109985293B CN 201711488959 A CN201711488959 A CN 201711488959A CN 109985293 B CN109985293 B CN 109985293B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/70—General characteristics of the apparatus with testing or calibration facilities
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention relates to a passage detection device of an indwelling catheter, in particular to a self-recovery device of a blood drawing method checking pipeline passage, which comprises a piston cylinder, a piston, a driving connecting piece and a resetting device, wherein the piston is arranged in the piston cylinder, a containing space of the piston is communicated between the indwelling catheter and a liquid source pipeline in a vein, the piston is connected with the driving connecting piece, and the resetting device is arranged between the driving connecting piece and the piston cylinder; the piston moves in the piston cylinder by pressing the driving connecting piece, negative pressure is formed between the indwelling catheter in the venous vessel and the liquid source pipeline, and whether blood flows back at the indwelling catheter is detected by the formed negative pressure; the detected piston is reset by the acting force of the reset device after the driving connecting piece is loosened. The invention can be connected with the indwelling catheter for a long time, is used for checking whether a pipeline is unobstructed before transfusion, simplifies the blood drawing operation, simultaneously reduces the individual difference problem of manual operation, and obviously improves the nursing operation efficiency and quality of the indwelling catheter before transfusion.
Description
Technical Field
The invention relates to a passage detection device of an indwelling catheter, in particular to a self-recovery device of a blood drawing method checking pipeline passage.
Background
The ministry of health in 2014 issued the latest "regulations on intravenous infusion treatment and care operations," which clearly states that Central Venous Catheters (CVCs), including Peripherally Inserted Central Catheters (PICC), must be intravenous by drawing back blood to confirm that the catheter is inside the vein. INS is in the flushing pipe and tube sealing standard of 2016 infusion therapy practice Standard: before each infusion, the vascular access device should be flushed and blood withdrawn to assess catheter function and prevent complications. In clinical infusion work, a common examination mode is that a nozzle of an injector is communicated with an infusion tube, a push rod of the injector is pulled to observe whether the front end of an indwelling catheter has a blood return phenomenon or not, if obvious blood return exists, a pipeline is clear, and then saline in the injector is pushed into the catheter; if no blood return or slow blood return is caused, the pipe blockage occurs in the pipeline, and the pipe needs to be replaced. The injector push rod is manually pulled by the medical staff, the medical staff is required to operate with two hands, the steps are more, the efficiency is lower, and the withdrawal force and the withdrawal distance can be different due to different operation habits.
Disclosure of Invention
In order to solve the above problems of the manual operation detection channel, the present invention aims to provide a self-recovery device for the channel of the blood drawing method detection channel. The self-recovery device of the inspection pipeline passage is connected with the indwelling catheter for a long time and is used for checking whether the indwelling catheter is unobstructed before transfusion, so that the individual difference problem of manual operation is reduced while the blood drawing operation is simplified, and the nursing operation efficiency and quality of the indwelling catheter before transfusion are obviously improved.
The aim of the invention is realized by the following technical scheme:
the invention comprises a piston cylinder, a piston, a driving connecting piece and a resetting device, wherein the piston is accommodated in the piston cylinder, the accommodating space of the piston is communicated between an indwelling catheter in a vein and a liquid source pipeline, the piston is connected with the driving connecting piece, and the resetting device is arranged between the driving connecting piece and the piston cylinder; the piston moves in the piston cylinder by pressing the driving connecting piece, negative pressure is formed between the indwelling catheter in the vein and the liquid source pipeline, and whether blood flows back at the indwelling catheter is detected by the formed negative pressure; the detected piston is reset by the acting force of the resetting device after the driving connecting piece is loosened;
wherein: in the process of pressing the driving connecting piece to drive the piston to move from an initial state, the volume of the space in the piston cylinder communicated with the indwelling catheter in the vein and the liquid source pipeline is increased, and then negative pressure is formed between the indwelling catheter in the vein and the liquid source pipeline;
the piston cylinder is provided with interfaces which are respectively communicated with an indwelling catheter in a vein and a liquid source pipeline, the two interfaces are mutually communicated, the two interfaces are arranged on the piston cylinder, or one of the interfaces is arranged on the piston cylinder, and the other end of the interface is formed by a puncture pipe which is inserted into the piston cylinder and penetrated by a piston;
the driving connecting piece comprises a negative pressure button and a piston seat, the middle part of the piston seat is positioned in the piston cylinder and connected with the piston, two opposite sides of the piston seat respectively penetrate through strip-shaped holes formed in two opposite sides of the piston cylinder, and the two opposite sides of the piston seat are respectively connected with the negative pressure button; the space for the negative pressure button to be pressed down and the piston seat to drive the piston to move is reserved between the negative pressure button and the piston cylinder and between the piston seat and the bottom of the piston cylinder respectively, the resetting device is positioned in the space between the negative pressure button and the piston cylinder or in the space between the piston seat and the bottom of the piston cylinder, one end of the resetting device is abutted with the piston cylinder, and the other end of the resetting device is abutted on the negative pressure button or the piston seat;
the device comprises a piston cylinder, a tee joint, a connecting port and a connecting port, wherein the piston cylinder is connected with a tee joint, one port of the tee joint is communicated with a space for accommodating a piston through the connecting port formed in the piston cylinder, and the other two ports of the tee joint are respectively communicated with an indwelling catheter in a vein and a liquid source pipeline;
the driving connecting piece comprises a compression bar and a piston connecting rod, one end of the piston connecting rod is inserted into the piston cylinder and connected with the piston, and the other end of the piston connecting rod is positioned outside the piston cylinder; the compression bar is hinged on the piston cylinder, one end of the compression bar is hinged with the other end of the piston connecting rod, and the other end of the compression bar is a free end; a space for the piston rod to drive the piston to move is reserved between one end of the piston connecting rod and the piston cylinder, the resetting device is positioned in the space, and two ends of the resetting device are respectively abutted to one ends of the piston cylinder and the piston connecting rod;
the driving connecting piece is a piston deflector rod, one end of the piston deflector rod is positioned in the piston cylinder and connected with the piston, and the other end of the piston deflector rod penetrates out of a strip-shaped hole formed in the piston cylinder; a space for the piston shifting rod to drive the piston to move is reserved between the piston shifting rod and the piston cylinder, the resetting device is positioned in the space, and two ends of the resetting device are respectively abutted to one ends of the piston cylinder and one end of the piston shifting rod;
the driving connecting piece comprises a negative pressure button and a negative pressure push rod, one end of the negative pressure push rod is positioned in the piston cylinder and connected with the piston, and the other end of the negative pressure push rod is positioned outside the piston cylinder and connected with the negative pressure button; a bulge for limiting the negative pressure push rod is arranged in the piston cylinder, and one end of the negative pressure push rod is abutted with the bulge; a space for the negative pressure button to press down and the negative pressure push rod to drive the piston to move is reserved between the negative pressure button and the piston cylinder and between one end of the negative pressure push rod and the bottom of the piston cylinder respectively, the resetting device is positioned in the space between the negative pressure button and the piston cylinder or in the space between the negative pressure push rod and the bottom of the piston cylinder, one end of the resetting device is abutted with the piston cylinder, and the other end of the resetting device is abutted with the negative pressure button or the piston;
a restoring push rod is arranged in a space between the negative pressure push rod and the bottom of the piston cylinder, one end of the restoring push rod is in butt joint with the piston, the other end of the restoring push rod is inserted into a through hole formed in the bottom of the piston cylinder, the restoring device is sleeved on the restoring push rod, and two ends of the restoring push rod are respectively in butt joint with the bottoms of the restoring push rod and the piston cylinder;
the section of the piston is U-shaped, and the inner edge of the opening end of the U-shaped extends inwards to form an extension part connected with the driving connecting piece; the piston is in sealing sliding connection with the inner wall of the piston cylinder.
The invention has the advantages and positive effects that:
1. the invention can be connected with the indwelling catheter for a long time, is used for checking whether a pipeline is unobstructed before transfusion, simplifies the blood drawing operation, simultaneously reduces the individual difference problem of manual operation, and obviously improves the nursing operation efficiency and quality of the indwelling catheter before transfusion.
2. The invention has simple structure, convenient operation, safety and reliability and low production cost.
Drawings
FIG. 1A is a front cross-sectional view of a first embodiment of the present invention;
FIG. 1B is a left side cross-sectional view of FIG. 1A;
fig. 2A is a front cross-sectional view of a second embodiment of the present invention;
FIG. 2B is a side cross-sectional view of FIG. 2A;
FIG. 3 is a front cross-sectional view of a third embodiment of the present invention;
fig. 4A is a front cross-sectional view of a fourth embodiment of the present invention;
FIG. 4B is a left side cross-sectional view of FIG. 4A;
fig. 5A is a front cross-sectional view of a fifth embodiment of the present invention;
FIG. 5B is a side cross-sectional view of FIG. 5A;
fig. 6A is a front cross-sectional view of a sixth embodiment of the present invention;
FIG. 6B is a left side cross-sectional view of FIG. 6A
FIG. 7A is a front cross-sectional view of a seventh embodiment of the invention;
FIG. 7B is a side cross-sectional view of FIG. 7A;
fig. 8A is a front cross-sectional view of an eighth embodiment of the present invention;
FIG. 8B is a side cross-sectional view of FIG. 8A;
fig. 9A is a front cross-sectional view of a ninth embodiment of the invention;
FIG. 9B is a side cross-sectional view of FIG. 9A;
FIG. 10 is a cross-sectional view of a piston of the present invention;
wherein: 1 is a negative pressure button, 2 is a piston, 3 is a piston cylinder, 4 is a piston seat, 5 is a spring, 6 is a lower cover, 7 is a piercing tube, 8 is an outlet, 9 is an inlet, 10 is a compression bar, 11 is a piston connecting rod, 12 is a piston deflector rod, 13 is a sealing ring, 14 is a negative pressure push rod, 15 is a restoring push rod, 16 is an extension part, 17 is a liquid flow channel, 18 is a tee joint, 19 is a bar-shaped hole, 20 is a groove, 21 is a guide groove, 22 is a through hole, 23 is a guide post, 24 is a bulge, and 25 is a gap.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
The invention comprises a piston cylinder 3, a piston 2, a driving connecting piece and a resetting device, wherein the piston 2 is arranged in the piston cylinder 3, the accommodating space of the piston 2 is communicated between an indwelling catheter in a vein and a liquid source pipeline, the piston 2 is connected with the driving connecting piece, and the resetting device is arranged between the driving connecting piece and the piston cylinder 3. The piston 2 moves in the piston cylinder 3 through the pressing driving connecting piece, negative pressure is formed between the indwelling catheter and the liquid source pipeline in the venous blood vessel, and the negative pressure is formed in the process that the pressing driving connecting piece drives the piston 2 to start moving from an initial state, the volume of the space in the piston cylinder 3 communicated with the indwelling catheter and the liquid source pipeline in the venous blood vessel is increased, and then the negative pressure is formed between the indwelling catheter and the liquid source pipeline in the venous blood vessel. And detecting whether the blood backflow exists at the indwelling catheter through the formed negative pressure, and resetting the detected piston 2 through the acting force of the resetting device after the driving connecting piece is loosened.
The piston cylinder 3 is provided with interfaces which are respectively communicated with an indwelling catheter in a vein and a liquid source pipeline, the two interfaces are mutually communicated, and both the two interfaces are arranged on the piston cylinder 3, or one of the interfaces is arranged on the piston cylinder 3, and the other end interface is formed by a puncture pipe 7 which is inserted into the piston cylinder 3 and penetrated by the piston 2. The piston cylinder 3 is detachably connected with a lower cover 6.
The piston 2 has a "U" shaped cross section with the inner edge of the open end of the "U" extending inwardly to form an extension 16 for connection to a drive connection. The piston 2 is in sealed sliding connection with the inner wall of the piston cylinder 3.
Example 1
As shown in fig. 1A and 1B, the driving connection piece of the present embodiment includes a negative pressure button 1 and a piston seat 4, the middle part of the piston seat 4 is located in a piston cylinder 3, an annular groove is formed along the circumferential direction, and an extension part 16 on the piston 2 is inserted in the annular groove, so that the middle part of the piston seat 4 is connected with the piston 2. Two opposite sides of the piston seat 4 respectively penetrate through strip-shaped holes 19 formed on two opposite sides of the piston cylinder 3 and are respectively connected with the negative pressure button 1; the negative pressure button 1 is provided with a top plate, and two sides of the top plate are side plates connected with two sides of the piston seat 4. Between the top plate of the negative pressure button 1 and the piston cylinder 3 and between the piston seat 4 and the bottom (i.e. the lower cover 6) of the piston cylinder 3, there are spaces for the negative pressure button 1 to push down and the piston seat 4 to drive the piston 2 to move, respectively, a resetting device is located in the space between the negative pressure button 1 and the piston cylinder 3 or in the space between the piston seat 4 and the bottom of the piston cylinder 3, one end of the resetting device is abutted with the piston cylinder 3, and the other end is abutted on the negative pressure button 1 or the piston seat 4. The resetting device of the embodiment is a spring 5, the spring 5 is positioned in the space between the piston seat 4 and the lower cover 6, and two ends of the spring are respectively abutted against the piston seat 4 and the lower cover 6; grooves 20 are respectively formed on the lower surface of the middle part of the piston seat 4 and the upper surface of the lower cover 6, and the upper and lower ends of the spring 5 are respectively accommodated in the grooves 20 on the piston seat 4 and the lower cover 6.
The piston cylinder 3 of this embodiment is provided with one port, namely an outlet 8, the other port being formed by a piercing tube 7; the puncture tube 7 penetrates through the lower cover 6, keeps the relative position with the lower cover 6 unchanged, sequentially penetrates through the piston seat 4 and the piston 2, and is communicated with a liquid flow passage 17 arranged in the piston cylinder 3; a sealed, relatively movable connection is provided between the piston 2 and the piercing tube 7. The end of the piercing tube 7 located outside the piston cylinder 3 can be regarded as another interface on the piston cylinder 3 and is communicated with a liquid source pipeline; the other end of the puncture tube 7 positioned inside the piston cylinder 3 is communicated with an outlet 8 through a liquid flow passage 17, and the outlet 8 is connected with an indwelling catheter in a venous blood vessel. The interface arranged on the piston cylinder 3 can be connected with the pipeline through a 6% luer conical connector, and also can be connected with the pipeline through bonding, welding, splicing and other modes. The liquid flowing through the liquid source pipeline can be liquid medicine, flushing pipe liquid or sealing pipe liquid.
The self-recovery device is connected with an indwelling catheter in a vein for a long time, and is used for checking whether a pipeline is unobstructed before transfusion or when the flow rate of liquid medicine is slow in the transfusion process. During the test, no liquid flow occurs in the puncture tube 7 as one interface. The finger presses the negative pressure button 1, and drives the piston 2 to move downwards through the piston seat 4, so that the volume of the closed cavity above the piston 2 is increased, local negative pressure is formed, and a small amount of blood in the blood vessel flows back to the indwelling catheter to check whether the indwelling catheter is unobstructed. After detection, the negative pressure button 1 is released, the piston 2 and the piston seat 4 are reset under the action of the spring 5, so that the closed cavity in the piston cylinder 3 is restored to the initial state, a small amount of blood pumped back to the indwelling catheter is pressed to return to the blood vessel, the check operation of whether the pipeline is unobstructed is completed, and transfusion is started or restored. During infusion, liquid flows in from one end of the puncture tube 7 and flows to the indwelling catheter in the venous blood vessel through the liquid flow channel 17 and the outlet 8. According to the condition, can press many times, reach the observation effect. When the indwelling catheter is required to be sealed, the puncture tube 7 serving as an interface is communicated with a sealing liquid pipeline, sealing liquid flows in from one end of the puncture tube 7 and flows to the indwelling catheter in the venous blood vessel through the liquid flow passage 17 and the outlet 8, and the indwelling catheter is sealed.
Example two
As shown in fig. 2A and 2B, the difference between the present embodiment and the first embodiment is that: the piston cylinder 3 of the embodiment is provided with two interfaces, namely an inlet 9 and an outlet 8, which are communicated through a liquid flow channel 17; the inlet 9 is communicated with a liquid source pipeline, and the outlet 8 is communicated with an indwelling catheter in a vein; this embodiment eliminates the piercing tube 7. The remainder was identical to that of the first embodiment.
During detection, no liquid flow occurs at the inlet 9. The finger presses the negative pressure button 1, and drives the piston 2 to move downwards through the piston seat 4, so that the volume of the closed cavity above the piston 2 is increased, local negative pressure is formed, and a small amount of blood in the blood vessel flows back to the indwelling catheter to check whether the indwelling catheter is unobstructed. After detection, the negative pressure button 1 is released, the piston 2 and the piston seat 4 are reset under the action of the spring 5, so that the closed cavity in the piston cylinder 3 is restored to the initial state, a small amount of blood pumped back to the indwelling catheter is pressed to return to the blood vessel, the check operation of whether the pipeline is unobstructed is completed, and transfusion is started or restored. During transfusion, liquid flows in from one end of the inlet 9 and flows to the indwelling catheter in the venous blood vessel through the liquid flow channel 17 and the outlet 8. According to the condition, can press many times, reach the observation effect. When the indwelling catheter is required to be sealed, the inlet 9 is communicated with the sealing liquid pipeline, sealing liquid flows in from the inlet 9 and flows to the indwelling catheter in the venous blood vessel through the liquid flow channel 17 and the outlet 8, and the indwelling catheter is sealed.
Example III
As shown in fig. 3, the piston cylinder 3 of the present embodiment is provided with two connectors, namely an inlet 9 and an outlet 8, which are communicated through a liquid flow passage 17; the inlet 9 is communicated with a liquid source pipeline, and the outlet 8 is communicated with an indwelling catheter in a vein. The driving connecting piece of the embodiment comprises a compression bar 10 and a piston connecting rod 11, wherein one end of the piston connecting rod 11 is inserted into a piston cylinder 3, an annular groove is formed in the circumferential direction, and an extension part 16 on the piston 2 is inserted into the annular groove, so that one end of the piston connecting rod 11 is connected with the piston 2; the other end of the piston rod 11 is located outside the piston cylinder 3. The compression bar 10 is hinged on the piston cylinder 3, one end is hinged with the other end of the piston connecting rod 11, and the other end of the compression bar 10 is a free end. A space for the piston rod 11 to drive the piston 2 to move is reserved between one end of the piston rod 11 and the piston cylinder 3, the resetting device in the embodiment is a spring 5, the spring 5 is positioned in the space, and two ends of the spring 5 are respectively abutted against one end of the piston cylinder 3 and one end of the piston rod 11.
During detection, no liquid flow occurs at the inlet 9. The finger presses the pressure lever 10, and the piston 2 is driven to move upwards through the piston connecting rod 11, so that the volume of the closed cavity below the piston 2 is increased, local negative pressure is formed, and a small amount of blood in a blood vessel flows back to the indwelling catheter to check whether the indwelling catheter is unobstructed. After detection, the compression bar 10 is loosened, the piston 2 and the piston connecting rod 11 are reset under the action of the spring 5, so that the closed cavity in the piston cylinder 3 is restored to the initial state, a small amount of blood pumped back to the indwelling catheter is pressed to return to the blood vessel, the check operation of whether the pipeline is unobstructed is finished, and transfusion is started or restored. During transfusion, liquid flows in from one end of the inlet 9 and flows to the indwelling catheter in the venous blood vessel through the liquid flow channel 17 and the outlet 8. According to the condition, can press many times, reach the observation effect. When the indwelling catheter is required to be sealed, the inlet 9 is communicated with the sealing liquid pipeline, sealing liquid flows in from the inlet 9 and flows to the indwelling catheter in the venous blood vessel through the liquid flow channel 17 and the outlet 8, and the indwelling catheter is sealed.
Example IV
As shown in fig. 4A and 4B, the difference between the present embodiment and the first embodiment is that: the spring 5 of the present embodiment is located in a space between the top plate of the negative pressure button 1 and the outer surface of the piston cylinder 3, and both ends thereof are respectively abutted against the top plate of the negative pressure button 1 and the outer surface of the piston cylinder 3. The remainder was identical to that of the first embodiment.
Example five
As shown in fig. 5A and 5B, the difference between the present embodiment and the second embodiment is that: the spring 5 of the present embodiment is located in a space between the top plate of the negative pressure button 1 and the outer surface of the piston cylinder 3, and both ends thereof are respectively abutted against the top plate of the negative pressure button 1 and the outer surface of the piston cylinder 3. The remainder was identical to that of the second embodiment.
Example six
As shown in fig. 6A and 6B, the difference between the present embodiment and the first embodiment is that: the piston cylinder 3 of this embodiment is provided with an interface, namely an outlet 8, the outlet 8 is connected with a tee 18, one interface of the tee 18 is communicated with a space for accommodating the piston 2 through the outlet 8 arranged on the piston cylinder 3, and the other two interfaces of the tee 18 are respectively communicated with an indwelling catheter in a venous vessel and a liquid source pipeline. This embodiment eliminates the piercing tube 7. The remainder was identical to that of the first embodiment.
During detection, no fluid flow occurs at an interface on tee 18 that communicates with the fluid source line. The finger presses the pressure lever 10, and the piston seat 4 drives the piston 2 to move downwards, so that the volume of the closed cavity above the piston 2 is increased, local negative pressure is formed, and a small amount of blood in the blood vessel flows back to the indwelling catheter to check whether the indwelling catheter is unobstructed. After detection, the negative pressure button 1 is released, the piston 2 and the piston seat 4 are reset under the action of the spring 5, so that the closed cavity in the piston cylinder 3 is restored to the initial state, a small amount of blood pumped back to the indwelling catheter is pressed to return to the blood vessel, the check operation of whether the pipeline is unobstructed is completed, and transfusion is started or restored. During infusion, liquid flows to the indwelling catheter in the venous blood vessel through the tee joint 18 and does not flow through the interior of the piston cylinder 3. According to the condition, can press many times, reach the observation effect. When the indwelling catheter is required to be sealed, one interface on the tee joint 18 is communicated with a sealing liquid pipeline, sealing liquid flows in from the interface of the tee joint 18 and flows to the indwelling catheter in the venous blood vessel through the liquid flow channel 17 and a second interface on the tee joint 18, and the indwelling catheter is sealed.
Example seven
As shown in fig. 7A and 7B, the difference between the present embodiment and the first embodiment is that: the driving connecting piece of the embodiment is a piston deflector rod 12, one end of the piston deflector rod 12 is positioned in the piston cylinder 3, an annular groove is formed in the circumferential direction, and an extension part 16 on the piston 2 is inserted in the annular groove, so that one end of the piston deflector rod 12 is connected with the piston 2; the other end of the piston rod 12 is penetrated out by a strip-shaped hole 19 arranged on the piston cylinder 3. A space for the piston deflector rod 12 to drive the piston 2 to move is reserved between the piston deflector rod 12 and the lower cover 6 at the bottom of the piston cylinder 3, the spring 5 is positioned in the space, and two ends of the spring 5 are respectively abutted against one end of the lower cover 6 and one end of the piston deflector rod 12. The remainder was identical to that of the first embodiment.
Example eight
As shown in fig. 8A and 8B, the driving connection piece of the present embodiment includes a negative pressure button 1 and a negative pressure push rod 14, the axial section of the negative pressure push rod 14 is in an inverted "T" shape, the transverse side of the "T" shape is located in the piston cylinder 3, and the extension portion 16 on the piston 2 is clamped on the upper portion of the transverse side of the "T" shape, so that the negative pressure push rod 14 is connected with the piston 2. The other end of the negative pressure push rod 14 (i.e. the vertical side of the "T") is located outside the piston cylinder 3 and connected to the negative pressure button 1. The negative pressure button 1 of the present embodiment has a top plate, and a plurality of guide posts 23 are provided on the lower surface of the top plate; the upper part of the piston cylinder 3 is provided with the same number of guide grooves 21 as the guide posts 23, and each guide post 23 is inserted into one guide groove 21. A space for the negative pressure button 1 to press down is reserved between the negative pressure button 1 and the piston cylinder 3, the spring 5 is positioned in the space between the negative pressure button 1 and the piston cylinder 3, and two ends of the spring are respectively abutted against the negative pressure button 1 and the piston cylinder 3. The negative pressure push rod 14 is provided with a sealing ring 13, so that the sealing between the negative pressure push rod 14 and the inner cavity of the piston cylinder 3 is ensured.
The piston cylinder 3 of the embodiment is provided with two interfaces, namely an inlet 9 and an outlet 8, which are communicated through a liquid flow channel 17; the inlet 9 is communicated with a liquid source pipeline, and the outlet 8 is communicated with an indwelling catheter in a vein. The liquid flow passage 17 is located above the piston 2 and extends downwards to form a bulge 24, and the bulge 24 is in an inverted frustum shape, and a gap 25 for liquid circulation is reserved between the bulge and the inner wall of the piston cylinder 3. One end of the negative pressure push rod 14 abuts against the projection 24, and the negative pressure push rod 14 is limited by the projection 24.
During detection, no liquid flow occurs at the inlet 9. The finger presses the negative pressure button 1, and the piston 2 is driven to move downwards through the negative pressure push rod 14, so that the volume of the closed cavity above the piston 2 is increased, a local negative pressure is formed, and a small amount of blood in a blood vessel flows back to the indwelling catheter to check whether the indwelling catheter is unobstructed. After detection, the negative pressure button 1 is released, the piston 2 and the negative pressure push rod 14 are reset under the action of the spring 5, so that the closed cavity in the piston cylinder 3 is restored to the initial state, a small amount of blood pumped back to the indwelling catheter is pressed to return to the blood vessel, the check operation of whether the pipeline is unobstructed is completed, and transfusion or recovery transfusion is started. During transfusion, liquid flows in from one end of the inlet 9 and flows to the indwelling catheter in the venous blood vessel through the liquid flow channel 17 and the outlet 8. According to the condition, can press many times, reach the observation effect. When the indwelling catheter is required to be sealed, the inlet 9 is communicated with the sealing liquid pipeline, sealing liquid flows in from the inlet 9 and flows to the indwelling catheter in the venous blood vessel through the liquid flow channel 17 and the outlet 8, and the indwelling catheter is sealed.
Example nine
As shown in fig. 9A and 9B, the difference between the present embodiment and the eighth embodiment is that: in this embodiment, a restoring push rod 15 is provided in the space between the negative pressure push rod 14 and the bottom (i.e., the lower cover 6) of the piston cylinder 3, and one end of the restoring push rod 15 abuts against the piston 2, while the other end is inserted into a through hole 22 formed in the bottom of the piston cylinder 3. The spring 5 is sleeved on the restoring push rod 15, and two ends of the spring are respectively abutted against the bottoms of the restoring push rod 15 and the piston cylinder 3.
During detection, no liquid flow occurs at the inlet 9. The finger presses the negative pressure button 1, and the piston 2 is driven to move downwards through the negative pressure push rod 14, so that the volume of the closed cavity above the piston 2 is increased, a local negative pressure is formed, and a small amount of blood in a blood vessel flows back to the indwelling catheter to check whether the indwelling catheter is unobstructed. When the negative pressure push rod 14 drives the piston 2 to move downwards, the lower end of the restoring push rod 15 moves in the through hole 22, and the guiding function is further achieved. After detection, the negative pressure button 1 is released, the piston 2, the negative pressure push rod 14 and the recovery push rod 15 are reset under the action of the spring 5, so that the closed cavity in the piston cylinder 3 is recovered to an initial state, a small amount of blood pumped back to the indwelling catheter is pressed to return to the blood vessel, the check operation of whether the pipeline is unobstructed is completed, and transfusion or recovery transfusion is started. During transfusion, liquid flows in from one end of the inlet 9 and flows to the indwelling catheter in the venous blood vessel through the liquid flow channel 17 and the outlet 8. According to the condition, can press many times, reach the observation effect. When the indwelling catheter is required to be sealed, the inlet 9 is communicated with the sealing liquid pipeline, sealing liquid flows in from the inlet 9 and flows to the indwelling catheter in the venous blood vessel through the liquid flow channel 17 and the outlet 8, and the indwelling catheter is sealed.
The operation of checking the indwelling catheter passageway is three steps of pressing, checking and loosening, and the operation steps are greatly reduced.
Claims (9)
1. The utility model provides a draw back blood method inspection pipeline route is from recovery unit which characterized in that: the device comprises a piston cylinder (3), a piston (2), a driving connecting piece and a resetting device, wherein the piston (2) is arranged in the piston cylinder (3), a containing space of the piston (2) is communicated between an indwelling catheter in a vein and a liquid source pipeline, the piston (2) is connected with the driving connecting piece, and the resetting device is arranged between the driving connecting piece and the piston cylinder (3); the piston (2) moves in the piston cylinder (3) through the pressing driving connecting piece, negative pressure is formed between the indwelling catheter in the vein and the liquid source pipeline, and whether blood flows back at the indwelling catheter is detected through the formed negative pressure; the detected piston (2) is reset by the acting force of the resetting device after the driving connecting piece is loosened;
the resetting device is a spring (5);
the piston cylinder (3) is provided with interfaces which are respectively communicated with an indwelling catheter in a vein and a liquid source pipeline, the two interfaces are mutually communicated, the two interfaces are both arranged on the piston cylinder (3), or one of the interfaces is arranged on the piston cylinder (3), and the other end of the interface is formed by a puncture pipe (7) which is inserted into the piston cylinder (3) and penetrated by the piston (2).
2. The flashback blood test line access self-healing device of claim 1, wherein: in the process of pressing the driving connecting piece to drive the piston (2) to start moving from the initial state, the volume of the space in the piston cylinder (3) communicated with the indwelling catheter in the vein and the liquid source pipeline is increased, and then negative pressure is formed between the indwelling catheter in the vein and the liquid source pipeline.
3. The flashback blood test line access self-healing device of claim 1, wherein: the driving connecting piece comprises a negative pressure button (1) and a piston seat (4), wherein the middle part of the piston seat (4) is positioned in the piston cylinder (3) and is connected with the piston (2), and two opposite sides of the piston seat (4) respectively penetrate through strip-shaped holes (19) formed in two opposite sides of the piston cylinder (3) and are respectively connected with the negative pressure button (1); the negative pressure button is characterized in that a space for the negative pressure button (1) to be pressed down and the piston seat (4) to drive the piston (2) to move is reserved between the negative pressure button (1) and the piston cylinder (3) and between the piston seat (4) and the bottom of the piston cylinder (3) respectively, the resetting device is located in the space between the negative pressure button (1) and the piston cylinder (3) or the space between the piston seat (4) and the bottom of the piston cylinder (3), one end of the resetting device is abutted with the piston cylinder (3), and the other end of the resetting device is abutted with the negative pressure button (1) or the piston seat (4).
4. The flashback blood test line access self-healing device of claim 1, wherein: the three-way valve is characterized in that the piston cylinder (3) is connected with a three-way valve (18), one interface of the three-way valve (18) is communicated with a space for accommodating the piston (2) through an interface formed in the piston cylinder (3), and the other two interfaces of the three-way valve (18) are respectively communicated with an indwelling catheter in a vein and a liquid source pipeline.
5. The flashback blood test line access self-healing device of claim 1, wherein: the driving connecting piece comprises a pressing rod (10) and a piston connecting rod (11), one end of the piston connecting rod (11) is inserted into the piston cylinder (3) and connected with the piston (2), and the other end of the piston connecting rod is positioned outside the piston cylinder (3); the compression bar (10) is hinged on the piston cylinder (3), one end of the compression bar is hinged with the other end of the piston connecting rod (11), and the other end of the compression bar (10) is a free end; a space for the piston connecting rod (11) to drive the piston (2) to move is reserved between one end of the piston connecting rod (11) and the piston cylinder (3), the resetting device is located in the space, and two ends of the resetting device are respectively abutted to one ends of the piston cylinder (3) and one end of the piston connecting rod (11).
6. The flashback blood test line access self-healing device of claim 1, wherein: the driving connecting piece is a piston deflector rod (12), one end of the piston deflector rod (12) is positioned in the piston cylinder (3) and is connected with the piston (2), and the other end of the piston deflector rod (12) penetrates out from a strip-shaped hole (19) formed in the piston cylinder (3); a space for the piston deflector rod (12) to drive the piston (2) to move is reserved between the piston deflector rod (12) and the piston cylinder (3), the reset device is positioned in the space, and two ends of the reset device are respectively abutted to one ends of the piston cylinder (3) and one end of the piston deflector rod (12).
7. The flashback blood test line access self-healing device of claim 1, wherein: the driving connecting piece comprises a negative pressure button (1) and a negative pressure push rod (14), one end of the negative pressure push rod (14) is positioned in the piston cylinder (3) and is connected with the piston (2), and the other end of the negative pressure push rod (14) is positioned outside the piston cylinder (3) and is connected with the negative pressure button (1); a bulge (24) for limiting the negative pressure push rod (14) is arranged in the piston cylinder (3), and one end of the negative pressure push rod (14) is abutted against the bulge (24); the device is characterized in that a space for the negative pressure button (1) to be pressed down and the negative pressure push rod (14) to drive the piston (2) to move is reserved between the negative pressure button (1) and the piston cylinder (3) and between one end of the negative pressure push rod (14) and the bottom of the piston cylinder (3) respectively, the reset device is located in the space between the negative pressure button (1) and the piston cylinder (3) or the space between the negative pressure push rod (14) and the bottom of the piston cylinder (3), one end of the reset device is abutted with the piston cylinder (3), and the other end of the reset device is abutted with the negative pressure button (1) or the piston (2).
8. The flashback blood test line access self-healing device of claim 7, wherein: the space between the negative pressure push rod (14) and the bottom of the piston cylinder (3) is provided with a recovery push rod (15), one end of the recovery push rod (15) is abutted with the piston (2), the other end of the recovery push rod is inserted into a through hole (22) formed in the bottom of the piston cylinder (3), the recovery device is sleeved on the recovery push rod (15), and two ends of the recovery push rod are respectively abutted to the bottoms of the recovery push rod (15) and the piston cylinder (3).
9. The flashback blood test line access self-healing device of claim 1, wherein: the cross section of the piston (2) is U-shaped, and the inner edge of the opening end of the U-shaped extends inwards to form an extension part (16) connected with the driving connecting piece; the piston (2) is in sealing sliding connection with the inner wall of the piston cylinder (3).
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| CN201711488959.4A CN109985293B (en) | 2017-12-30 | 2017-12-30 | Device for automatically recovering passage of blood withdrawal method inspection pipeline |
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| CN109985293A (en) | 2019-07-09 |
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