A clinical contrast-enhancing injection device for cardiovascular medicine

Abstract

This invention relates to the field of clinical contrast-enhanced injection technology, and more particularly to a clinical contrast-enhanced injection device for cardiovascular medicine. The device includes a housing, a reservoir mounted on the top of the housing, a dispensing tube connected to the upper end of the reservoir, a heating tube installed inside the reservoir, a pressure plate installed inside the heating tube, a fixing column fixedly connected to the center of the reservoir, a transport tube connected to the bottom of the fixing column, a connector connected to the bottom of the transport tube, a pipe groove inside the housing, a sealing door installed at the groove opening, a receiving groove inside the pipe groove, a receiving mechanism installed inside the receiving groove, and a transport mechanism installed inside the housing. This invention allows for free control of the injection tube's length, and the heated injection tube is more adaptable to deformation, maintaining a small temperature difference with the contrast agent in the reservoir when extended for use, thus maintaining the stability of the contrast agent during use.

Description

Technical Field

[0001] This invention relates to the field of clinical contrast injection technology, and more particularly to a clinical contrast injection device for cardiovascular medicine. Background Technology

[0002] In cardiology, clinical angiography is a key tool for diagnosing structural heart diseases such as coronary heart disease. Currently, percutaneous coronary angiography remains the standard for assessing coronary artery stenosis. Doctors insert a catheter into the coronary ostium through the radial or femoral artery, inject iodine-containing contrast agent, and dynamically visualize the vascular lumen under X-ray fluoroscopy, which can clearly identify the location and degree of stenosis.

[0003] Existing technologies often use injection tubes of specific specifications. When faced with complex usage scenarios and special types of patients, the tubes need to be modified. Adjustments can only be made by connecting or cutting. With relatively fixed tube specifications, cutting can easily lead to a lot of waste and rely on experience. Connecting the tubes can cause changes in the original injection pressure or even leakage. Cutting and connecting the injection tubes can also easily cause damage and contamination. It is not easy to obtain injection tubes of a suitable length, which greatly affects the effectiveness of use. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that the injection tube cannot be safely and quickly obtained to a suitable length in the prior art, and to propose a clinical angiography injection device for cardiovascular medicine.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a clinical angiography injection device for cardiovascular medicine, comprising a housing, a control panel installed at the bottom of the housing, a liquid storage tank installed at the top of the housing, a liquid addition pipe connected to the upper end of the liquid storage tank, a heating pipe installed inside the liquid storage tank, a pressure plate installed inside the heating pipe, a fixing column fixedly connected to the center of the liquid storage tank, a transport pipe connected to the bottom of the fixing column, the transport pipe extending into the housing and having a connector fixedly connected to one end inside the housing, a pipe groove opened inside the housing, a sealing door installed at the opening of the pipe groove, a storage groove opened inside the pipe groove, a storage mechanism installed inside the storage groove, and a transport mechanism installed inside the housing.

[0006] In the aforementioned clinical contrast injection device for cardiovascular medicine, the top of the reservoir is fixedly connected to the pressure plate via an electric push rod. The pressure plate is slidably connected to the heating tube and the fixed column in a sealed manner. Heating elements are installed inside the heating tube and the pressure plate.

[0007] In the aforementioned clinical contrast injection device for cardiovascular medicine, the bottom of the fixed column has an injection groove, the transport tube passes through the bottom of the fixed column, the top of the transport tube is connected to an electric push rod and the output shaft of the electric push rod is slidably connected to the fixed column, the top of the transport tube has a transport groove, and the opening direction of the transport groove corresponds to the opening direction of the injection groove.

[0008] In the aforementioned clinical contrast injection device for cardiovascular medicine, the transport tube is an L-shaped tube, a valve is installed inside the transport tube, a flow meter is installed inside the connection position between the transport tube and the connector, a locking airbag is installed on the outside of the connector, the locking airbag is connected to an inflation pipe and the inflation pipe is connected to an external air pump, and a connecting pipe is connected to the side of the connector away from the transport tube.

[0009] In the aforementioned clinical contrast injection device for cardiovascular medicine, the connector and the transport tube have space for vertical movement inside the outer shell, and the connecting tube is a rigid pipe with a diameter smaller than the inner diameter of the injection tube.

[0010] In the aforementioned clinical contrast injection device for cardiovascular medicine, the transport mechanism includes a first transport roller, a second transport roller, a first moving roller, and a second moving roller. The first transport roller is installed on the upper end of the pipe groove on the side of the connector away from the transport tube. The first moving roller is installed below the first transport roller via an electric push rod. The second transport roller is installed on the upper end of the pipe groove between the receiving groove and the transport tube. The second moving roller is installed below the second transport roller via an electric push rod.

[0011] In the aforementioned clinical contrast injection device for cardiovascular medicine, a clamping plate is connected to the side wall of the channel between the first transport roller and the first moving roller near the connector head via an electric push rod. The clamping plate is slidably connected to the connector head on the side near the connector head.

[0012] In the aforementioned clinical contrast injection device for cardiovascular medicine, a second lead screw is rotatably connected to the side wall of the channel between the second transport roller and the second moving roller via a motor. The two ends of the second lead screw have opposite thread directions, and a cutting blade holder is threaded to both sides of the second lead screw. A guide rod is slidably connected to the other side of the cutting blade holder.

[0013] In the aforementioned clinical contrast injection device for cardiovascular medicine, the storage mechanism includes a storage shell with a mounting cover that rotates to the top. A winding roller is connected to both the storage shell and the storage groove. A second sliding groove is formed at the bottom of the storage shell, and a first sliding groove is formed at the bottom of the storage groove. The first and second sliding grooves are positioned correspondingly. A push ring is slidably connected to the outside of the winding roller, and a connecting block is fixedly connected to the bottom of the push ring. The connecting block is slidably connected to the second sliding groove. A first lead screw rotates together with the first and second sliding grooves, and the first lead screw is threadedly connected to the connecting block.

[0014] In the aforementioned clinical contrast injection device for cardiovascular medicine, the cutting blade holder is a heated blade, and the take-up roller, the first transport roller, the second transport roller, the first moving roller, and the second moving roller are equipped with heating elements and have heat-conducting rubber pads wrapped around the outside of the injection tube.

[0015] Compared with existing technologies, the advantages of this invention are: 1. This invention enables on-demand use of injection tubes by pre-installing injection tubes of sufficient length. The rotation of the take-up roller and the push ring allow the wound injection tube to extend freely to the appropriate length before use, avoiding cutting waste and leakage at the connection point. Different specifications of injection tubes can be freely replaced by changing the take-up roller. After determining the appropriate length, the cutting blade holder, take-up roller, and transport roller are heated to the appropriate temperature. The rotation of the second lead screw controls the two cutting blade holders to move closer to each other, quickly cutting the injection tube. The moving roller and lifting transport pipe settings can quickly adapt to different specifications of injection tubes.

[0016] 2. This invention controls the extended injection tube to a suitable temperature by using a cutting blade holder, a winding roller, and a transport roller. The rotation of the second lead screw controls the two cutting blade holders to move closer to each other, quickly cutting the injection tube and ensuring that the injection tube reaches the optimal length. Heating makes the injection tube more adaptable to deformation and maintains a small temperature difference with the contrast agent in the storage tank when it is about to be used, thus maintaining the stability of the contrast agent during use.

[0017] 3. The present invention uses a pressure plate, a first transport roller, a first moving roller and a locking airbag to fix the injection tube port together, which greatly improves the sealing connection and meets the needs of quick, safe and readily available use, while also providing convenience for injecting contrast agents.

[0018] 4. This invention monitors the flow rate in real time and provides feedback data through a flow meter, and controls the flow rate of the contrast agent output by adjusting the extension speed of the electric push rod at the top of the pressure plate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a clinical angiography injection device for cardiovascular medicine proposed in this invention. Figure 2 This is a schematic diagram of the structure of a clinical angiography injection device for cardiovascular medicine proposed in this invention from another perspective. Figure 3 This is a schematic diagram of the outer shell and the internal structure of the reservoir of a clinical contrast injection device for cardiovascular medicine proposed in this invention. Figure 4 This is a schematic diagram of the structure of the fixation column, transport tube, and connector of a clinical angiography injection device for cardiovascular medicine proposed in this invention. Figure 5 This is a schematic diagram of the internal structure of the transport tube and connector of a clinical angiography injection device for cardiovascular medicine proposed in this invention. Figure 6 for Figure 5 A magnified structural diagram of part A in the middle; Figure 7 This is a schematic diagram of the cutting blade holder of a clinical angiography injection device for cardiovascular medicine proposed in this invention; Figure 8 This is a schematic diagram of the internal structure of the housing of a clinical angiography injection device for cardiovascular medicine proposed in this invention. Figure 9 for Figure 8 A magnified structural diagram of part B.

[0020] In the diagram: 1. Outer shell; 2. Control panel; 3. Liquid storage tank; 4. Storage shell; 5. Mounting cover; 6. Heating tube; 7. Pressure plate; 8. Fixing column; 9. Injection tank; 10. Injection pipe; 11. Pipeline groove; 12. Storage groove; 13. Sealing door; 14. First transport roller; 15. First moving roller; 16. Second transport roller; 17. Second moving roller; 18. Rewinding roller; 19. First chute; 20. First lead screw; 21. Clamping plate; 22. Transport pipe; 23. Transport groove; 24. Connector; 25. Locking airbag; 26. Connecting pipe; 27. Flow meter; 28. Second lead screw; 29. ​​Guide rod; 30. Cutting blade holder; 31. Push ring; 32. Connecting block; 33. Second chute. Detailed Implementation

[0021] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] Example Reference Figure 1-3A clinical contrast-enhancing injection device for cardiovascular medicine includes a housing 1. A control panel 2 is installed at the bottom of the housing 1, allowing for free observation and control of data from internal components. A reservoir 3 is installed at the top of the housing 1, and a filling tube 10 is connected to the upper end of the reservoir 3 for introducing contrast agent to remove air bubbles. The filling tube 10 is specially designed to expel internal air while injecting the contrast agent, ensuring sufficient filling of the reservoir 3. A heating tube 6 is installed inside the reservoir 3, and a pressure plate 7 is installed inside the heating tube 6. A centrally fixed connection is made inside the reservoir 3. A fixed post 8 is connected to the bottom of the fixed post 8, and a transport tube 22 is connected to the bottom of the fixed post 8. The transport tube 22 extends into the inside of the outer shell 1 and a connector 24 is fixedly connected to one end of the tube. A pipe groove 11 is opened inside the outer shell 1. The injection tube extends out of the pipe groove 11. A sealing door 13 is installed at the opening of the pipe groove 11 to isolate it from the outside and prevent contamination. A storage groove 12 is opened inside the pipe groove 11. A storage mechanism is installed inside the storage groove 12. The storage mechanism can freely load and unload injection tubes of appropriate specifications. A transport mechanism is installed inside the outer shell 1 for internal portable cutting and transport.

[0023] Reference Figure 3-6 The top of the storage tank 3 is fixedly connected to the pressure plate 7 via an electric actuator. The pressure plate 7 descends to control the contrast agent flow rate. The pressure plate 7 is sealed and slidably connected to the heating tube 6 and the fixed column 8. Heating elements are installed inside the heating tube 6 and the pressure plate 7. The heating elements inside the heating tube 6 and the bottom of the pressure plate 7 control the temperature change of the contrast agent inside the storage tank 3. The bottom of the fixed column 8 has an injection groove 9. The transport pipe 22 passes through the bottom of the fixed column 8. The top of the transport pipe 22 is connected to an electric actuator, and the output shaft of the electric actuator is slidably connected to the fixed column 8. The top of the transport pipe 22 has a transport groove 23. The opening direction of the transport groove 23 corresponds to the opening direction of the injection groove 9. The contrast agent can only be introduced into the transport pipe 22 when the injection groove 9 and the transport groove 23 are connected. The flow meter 27 monitors the flow rate in real time and feeds back the data. The extension speed of the electric actuator at the top of the pressure plate 7 controls the flow rate of the contrast agent output.

[0024] The transport tube 22 is an L-shaped tube with a valve installed inside to prevent contrast agent leakage. A flow meter 27 is installed inside the connection point between the transport tube 22 and the connector 24. A locking airbag 25 is installed on the outside of the connector 24. The locking airbag 25 is connected to an inflation pipe, which is connected to an external air pump. A connecting pipe 26 is connected to the side of the connector 24 away from the transport tube 22. The injection tube port is fixed by the pressure plate 7, the first transport roller 14, the first moving roller 15, and the locking airbag 25, which greatly improves the sealing connection and provides convenience for injecting contrast agent.

[0025] The connector 24 and the transport tube 22 have vertical movement space inside the housing 1. Normally, they are in a stored position, not affecting the transport of the injection tube. Before injecting contrast agent, a predetermined length of injection tube is quickly connected. The connecting tube 26 is a rigid pipe with a diameter smaller than the inner diameter of the injection tube. The transport mechanism includes a first transport roller 14, a second transport roller 16, a first moving roller 15, and a second moving roller 17. The first transport roller 14 is installed on the upper end of the pipe groove 11 on the side of the connector 24 away from the transport tube 22. The first moving roller 15 is installed below the first transport roller 14 via an electric push rod. The second transport roller 16 is installed on the upper end of the pipe groove 11 between the storage groove 12 and the transport tube 22. The second moving roller 17 is installed below the second transport roller 16 via an electric push rod. The winding roller 18 rotates, and the push ring 31 pushes, allowing the wound injection tube to extend freely to a suitable length before use, avoiding cutting waste and leakage at the connection point. Different specifications of injection tubes can be freely replaced by changing the winding roller 18. The side wall of the pipe groove 11 between the first transport roller 14 and the first moving roller 15 near the connector 24 is connected to a clamping plate 21 by an electric push rod. The clamping plate 21 is slidably connected to the connector 24 on the side near the connector 24. The clamping plates 21 are close to each other and limit the position at the injection tube port to ensure that the connecting pipe can be smoothly inserted into the injection tube 26.

[0026] Reference Figure 7 The side wall of the pipe groove 11 between the second transport roller 16 and the second moving roller 17 is connected to a second lead screw 28 via a motor. The threads at both ends of the second lead screw 28 are in opposite directions. Cutting blade holders 30 are threaded to both sides of the second lead screw 28. After the injection tube extends to a suitable length, the cutting blade holders 30, the winding roller 18, and the transport roller are heated to a suitable temperature. The rotation of the second lead screw 28 controls the two cutting blade holders 30 to move closer to each other, quickly cutting the injection tube to ensure that the injection tube reaches the optimal length. A guide rod 29 is slidably connected to the other side of the cutting blade holders 30 to limit the position and share a certain amount of pressure.

[0027] Reference Figure 8 , 9 The storage mechanism includes a storage shell 4. A mounting cover 5 is rotated on top of the storage shell 4 to facilitate quick installation of the take-up roller 18 and the injection tube. The take-up roller 18 is connected to both the storage shell 4 and the storage groove 12. The take-up roller 18 is controlled by a drive motor inside the storage shell 4. A second sliding groove 33 is opened at the bottom of the storage shell 4, and a first sliding groove 19 is opened at the bottom of the storage groove 12. The first sliding groove 19 and the second sliding groove 33 are positioned correspondingly. A push ring 31 is slidably connected to the outside of the take-up roller 18. A connecting block 32 is fixedly connected to the bottom of the push ring 31. The connecting block 32 is slidably connected to the second sliding groove 33. A first lead screw 20 rotates together with the first sliding groove 19 and the second sliding groove 33. The first lead screw 20 is threadedly connected to the connecting block 32. Controlling the first lead screw 20 can move the push ring 31.

[0028] The cutting blade holder 30 is a heated blade. Heating elements are installed inside the winding roller 18, the first transport roller 14, the second transport roller 16, the first moving roller 15, and the second moving roller 17, and the outer side of the contact tube is wrapped with a heat-conducting rubber pad. The cutting blade holder, the winding roller, and the transport roller control the extended injection tube to be heated to a suitable temperature. The rotation of the second screw controls the two cutting blade holders to move closer to each other, quickly cutting the injection tube to ensure that the injection tube reaches the optimal length. Heating makes the injection tube more adaptable to deformation and maintains a small temperature difference with the contrast agent in the reservoir when it is about to be used, thus maintaining the stability of the contrast agent during use. The rubber pad supports flexible contact and avoids external damage to the injection tube.

[0029] In this invention, before the device operates, the pressure plate 7 is locked in the highest position by an electric actuator. The electric actuator at the top of the transport pipe 22 retracts, causing the injection tank 9 and the transport tank 23 to be misaligned. The contrast agent to remove air bubbles is introduced into the storage tank 3 through the liquid addition pipe 10. The liquid addition pipe 10 is specially designed to expel internal air while injecting the contrast agent, so that the contrast agent can be fully filled into the storage tank 3. The heating elements inside the heating pipe 6 and at the bottom of the pressure plate 7 control the temperature change of the contrast agent inside the storage tank 3. The winding roller 18 of the injection tube is installed in advance into the storage shell 3. The winding roller 18 is rotated by a motor inside the storage shell 3. The first lead screw 20 is controlled to make the push ring 31 press the injection tube. The injection tube opening extends between the second transport pipe 16 and the second moving roller 17.

[0030] Existing technologies often use injection tubes of specific specifications. When faced with complex usage scenarios and special types of patients, changes in the tubing are required, which can only be adjusted by connecting or cutting. When the tubing specifications are relatively fixed, cutting can easily lead to a lot of waste and rely on experience. Connecting the tubing can cause changes in the original injection pressure or even leakage, which greatly affects the use effect. The rotation of the take-up roller 18 and the push ring 31 push allow the take-up injection tube to extend freely to the appropriate length before use, avoiding cutting waste and leakage at the connection. Different specifications of injection tubes can be freely replaced by changing the take-up roller 18. After determining the appropriate length, the cutter holder 30, the take-up roller 18 and the transport roller are heated to the appropriate temperature. The second lead screw 28 rotates to control the two cutter holders 30 to move closer to each other and quickly cut the injection tube, ensuring that the injection tube used reaches the optimal length. In addition, heating components are installed inside the take-up roller 18 and the transport tube. Heating makes the injection tube more adaptable to deformation and maintains a small temperature difference with the contrast agent in the reservoir 3 when it is about to be used, thus maintaining the stability of the contrast agent during use.

[0031] After the injection tube is cut to the appropriate length, the first transport roller 14 and the first moving roller 15 work to position the injection tube port between the clamps 21. The electric actuator controls the originally stored transport tube 22 to descend to the appropriate position. During this process, the valve inside the transport tube 22 remains closed, and the two clamps 21 move closer to each other to restrict the direction of the injection tube. The first transport roller 14 and the first moving roller 15 transport in opposite directions to ensure that the injection tube is smoothly inserted into the connecting tube 26 of the connector 24, and the end of the injection tube contacts the connector 24. Then, gas is injected into the locking airbag 25, which expands and presses the outside of the injection tube to form a sealed connection. Only by opening the valve inside the transport tube 22, the contrast agent can be introduced into the injection tube through the injection tank 9 and the transport tank 23 from the connector 24. The flow meter 27 monitors the flow rate in real time and feeds back the data. The extension speed of the electric actuator at the top of the pressure plate 7 controls the flow rate of the contrast agent output.

[0032] The injection tube port is fixed by the pressure plate 7, the first transport roller 14, the first moving roller 15 and the locking airbag 25, which greatly improves the sealing connection and meets the needs of quick, safe and readily available use, while also providing convenience for injecting contrast agents.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A clinical contrast-enhancing injection device for cardiovascular medicine, comprising a housing (1), characterized in that, A control panel (2) is installed at the bottom of the outer shell (1), a liquid storage tank (3) is installed at the top of the outer shell (1), a liquid filling pipe (10) is connected to the upper end of the liquid storage tank (3), a heating pipe (6) is installed inside the liquid storage tank (3), a pressure plate (7) is installed inside the heating pipe (6), a fixed column (8) is fixedly connected to the center inside the liquid storage tank (3), a transport pipe (22) is connected to the bottom of the fixed column (8), the transport pipe (22) extends into the inner shell (1) and a connector (24) is fixedly connected to one end inside the inner shell (1), a pipe groove (11) is opened inside the outer shell (1), a sealing door (13) is installed at the opening of the pipe groove (11), a storage groove (12) is opened inside the pipe groove (11), a storage mechanism is installed inside the storage groove (12), and a transport mechanism is installed inside the outer shell (1).

2. The clinical angiography injection device for cardiovascular medicine according to claim 1, characterized in that, The top of the liquid storage tank (3) is fixedly connected to the pressure plate (7) by an electric push rod. The pressure plate (7) is sealed and slidably connected to the heating tube (6) and the fixed column (8). Heating elements are installed inside the heating tube (6) and the pressure plate (7).

3. The clinical angiography injection device for cardiovascular medicine according to claim 1, characterized in that, The bottom of the fixed column (8) has an injection groove (9), the transport pipe (22) passes through the bottom of the fixed column (8), the top of the transport pipe (22) is connected to an electric push rod and the output shaft of the electric push rod is slidably connected to the fixed column (8), the top of the transport pipe (22) has a transport groove (23), and the opening direction of the transport groove (23) corresponds to the opening direction of the injection groove (9).

4. The clinical angiography injection device for cardiovascular medicine according to claim 1, characterized in that, The transport pipe (22) is an L-shaped pipe. A valve is installed inside the transport pipe (22). A flow meter (27) is installed inside the connection position between the transport pipe (22) and the connector (24). A locking airbag (25) is installed on the outside of the connector (24). The locking airbag (25) is connected to an inflation pipe and the inflation pipe is connected to an external air pump. A connecting pipe (26) is connected to the side of the connector (24) away from the transport pipe (22).

5. A clinical angiography injection device for cardiovascular medicine according to claim 4, characterized in that, The connector (24) and the transport pipe (22) have space for vertical movement inside the outer shell (1), and the connecting pipe (26) is a rigid pipe with a pipe opening diameter smaller than the inner diameter of the injection pipe.

6. The clinical angiography injection device for cardiovascular medicine according to claim 1, characterized in that, The transport mechanism includes a first transport roller (14), a second transport roller (16), a first moving roller (15), and a second moving roller (17). The first transport roller (14) is installed on the upper end of the pipe groove (11) on the side of the connector (24) away from the transport pipe (22). The first moving roller (15) is installed below the first transport roller (14) by an electric push rod. The second transport roller (16) is installed on the upper end of the pipe groove (11) between the receiving groove (12) and the transport pipe (22). The second moving roller (17) is installed below the second transport roller (16) by an electric push rod.

7. A clinical angiography injection device for cardiovascular medicine according to claim 1, characterized in that, The side wall of the pipe groove (11) between the first transport roller (14) and the first moving roller (15) near the connector (24) is connected to a clamp (21) by an electric push rod. The clamp (21) is slidably connected to the connector (24) on the side near the connector (24).

8. A clinical angiography injection device for cardiovascular medicine according to claim 1, characterized in that, The side wall of the pipe groove (11) between the second transport roller (16) and the second moving roller (17) is connected to a second lead screw (28) by a motor. The two ends of the second lead screw (28) have opposite thread directions. The two sides of the second lead screw (28) are respectively threaded to a cutting blade holder (30), and the other side of the cutting blade holder (30) is slidably connected to a guide rod (29).

9. A clinical angiography injection device for cardiovascular medicine according to claim 1, characterized in that, The storage mechanism includes a storage shell (4), a mounting cover (5) that rotates on top of the storage shell (4), a winding roller (18) that is connected to the storage shell (4) and the storage groove (12), a second sliding groove (33) that is opened at the bottom of the storage shell (4), a first sliding groove (19) that is opened at the bottom of the storage groove (12), the first sliding groove (19) and the second sliding groove (33) that are in corresponding positions, a push ring (31) that is slidably connected to the outside of the winding roller (18), a connecting block (32) that is fixedly connected to the bottom of the push ring (31), the connecting block (32) that is slidably connected to the second sliding groove (33), a first lead screw (20) that rotates together with the first sliding groove (19) and the second sliding groove (33), and the first lead screw (20) that is threadedly connected to the connecting block (32).

10. A clinical angiography injection device for cardiovascular medicine according to claim 9, characterized in that, The cutting blade holder (30) is a heated blade. The winding roller (18), the first transport roller (14), the second transport roller (16), the first moving roller (15), and the second moving roller (17) are equipped with heating elements and have heat-conducting rubber pads wrapped around the outside of the injection tube.

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