Injector for preventing injection into blood vessel and injection device for urethral filler
Through the cavity structure and sealing design of the inner and outer shells, the safety and accuracy of the syringe during injection are achieved, the problems of accidental entry into blood vessels and blood return contamination are solved, and the risk of withdrawal resistance and filler contamination is reduced.
Patent Information
- Application Number
- CN202422347619.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-09-25
AI Technical Summary
Existing syringes are prone to accidentally entering blood vessels when injecting fillers, causing vascular embolism, and there is great resistance during withdrawal, and the returned blood may contaminate the filler.
A syringe that prevents injection into blood vessels is designed. It adopts a cavity structure between the inner shell and the outer shell, forms negative pressure through a suction mechanism, and uses a sealing piece to separate the inner shell and the injection needle. The returning blood enters the cavity through the second channel to determine whether the injection needle is inserted into the blood vessel, and a valve flap is used to prevent the returning blood from contaminating the filler.
It reduces the withdrawal resistance, avoids the contamination of the filler, improves the safety and accuracy of the operation, and reduces the risk of vascular embolism.
Smart Images
Figure CN223365998U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of syringes, and in particular to a syringe that is prevented from being injected into blood vessels and an injection device for urethral fillers. Background Art
[0002] Common fillers include hyaluronic acid and collagen. However, if fillers are accidentally injected into a blood vessel during the injection process, vascular embolism can easily occur, leading to complications and, in severe cases, death. The ability of the operator to promptly detect the insertion of a blood vessel based on blood return is crucial to preventing vascular embolism. However, current syringes are pre-loaded with filler, resulting in high resistance to withdrawal. Furthermore, if blood return occurs during insertion, it can contaminate the filler. Utility Model Content
[0003] The present application provides a syringe that prevents injection into blood vessels and an injection device for a urethral filler, which can reduce the resistance to withdrawal and improve the contamination of the filler by returning blood.
[0004] This application is implemented as follows:
[0005] In a first aspect, the present application provides a syringe that prevents injection into a blood vessel, comprising:
[0006] An injection housing, the injection housing comprising an inner housing and an outer housing spaced apart, a cavity being formed between the inner housing and the outer housing, the outer housing being used to connect to a suction mechanism to suction the cavity to form a negative pressure;
[0007] A needle seat, wherein the needle seat is provided with a first channel and a second channel connected to each other, the first channel axially passes through the needle seat, and the second channel is connected to the cavity;
[0008] an injection needle, the injection needle being installed in the first channel;
[0009] a pusher, one end of which is mounted inside the inner shell and slidably connected to the inner wall of the inner shell; and
[0010] A blocking member, which is passed through the push member and can move along the length direction of the push member, has a first end and a second end, the first end blocks the first channel, and the second end is arranged outside the end of the push member away from the injection shell; the port of the second channel is located between the first end of the blocking member and the end of the injection needle installed in the first channel.
[0011] In a possible embodiment, the blocking member includes a blocking head and a lifting rod connected to the blocking head, and the pushing member includes a pushing block slidably engaged with the inner wall of the inner shell and a pushing rod connected to the pushing block; a first card slot is provided at one end of the pushing block close to the injection needle, and the blocking head can be snapped into the first card slot.
[0012] In a possible implementation manner, the thickness of the blocking head is the same as the depth of the first slot. When the blocking head is engaged in the first slot, the surface of the blocking head is flush with the surface of the injection block.
[0013] In a possible embodiment, the lifting rod includes a multi-section rod body, and two adjacent sections of the rod body are hinged; the pushing rod includes a push rod and a push plate, and the two ends of the push rod are respectively connected to the pushing block and the push plate, and the push plate is provided with a second card slot, and the rod body can be clamped in the second card slot.
[0014] In a possible implementation manner, when the rod body is locked in the second locking groove, the surface of the rod body is flush with the surface of the push plate.
[0015] In a possible implementation manner, the outer shell is transparent.
[0016] In a possible embodiment, the outer shell is provided with a connecting port, the connecting port is communicated with the cavity, the connecting port is connected to a suction mechanism via a connecting pipe, and the connecting pipe is detachably connected to the connecting port.
[0017] In a possible implementation, the outer shell is connected to a blocking column, one end of which is connected to a side of the connecting port, and the blocking column is capable of blocking the connecting port.
[0018] In one possible embodiment, the cavity or the second channel is equipped with a valve flap, one end of which is connected to the inner wall of the cavity or the inner wall of the second channel and can form a one-way valve; when suction forms a negative pressure, the valve flap opens toward the end away from the injection needle to allow liquid to pass through, and when no negative pressure is formed, the valve flap closes the second channel.
[0019] In a second aspect, the present application provides an injection device for a urethral filler, comprising: the syringe for preventing injection into a blood vessel according to the first aspect; and
[0020] A syringe connector includes a first barrel and a second barrel of an integral structure, wherein the first barrel is used to mount an endoscope, and the second barrel is used to mount the syringe that prevents injection into blood vessels, wherein the injection needle of the syringe that prevents injection into blood vessels can extend out of the second barrel from the interior of the second barrel.
[0021] In a possible embodiment, the inner cavity of the second cylinder includes a first section and a second section, and the angle between the central axis of the second section and the central axis of the first section is an acute angle or a right angle.
[0022] The embodiments of the present application have at least the following beneficial effects:
[0023] The syringe of the present application, which prevents injection into blood vessels, uses a suction mechanism to suction the cavity formed between the inner shell and the outer shell. The blocking member blocks the first channel, and the port of the second channel is located between the first end of the blocking member and the end of the injection needle installed in the first channel. The blocking member separates the filler pre-installed in the inner shell from the injection needle. When the injection needle is inserted into the target skin location, if the injection needle is inserted into a blood vessel, blood return will enter the cavity from the second channel through the injection needle, thereby determining whether the injection needle has been inserted into the blood vessel by the presence of blood return. The suction channel does not contain filler, thereby reducing the resistance to backflow. Moreover, because the blocking member separates the interior of the inner shell from the injection needle, blood return will not enter the interior of the inner shell and mix with the filler, which can improve the contamination of the filler by blood return. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.
[0025] Figure 1 This is a schematic structural diagram of a syringe for preventing blood vessel injection according to an embodiment of the present application in one state;
[0026] Figure 2 for Figure 1 Enlarged view of area A in the middle;
[0027] Figure 3 This is a schematic diagram of the valve disc opening;
[0028] Figure 4 for Figure 1 Enlarged view of area B in the middle;
[0029] Figure 5 This is a schematic structural diagram of the syringe for preventing blood vessel injection according to an embodiment of the present application in another state;
[0030] Figure 6 This is a schematic diagram of the rod body of the embodiment of the present application when it is engaged in the second engaging slot;
[0031] Figure 7Schematic diagram of the structure of an injection device for urethral filler according to an embodiment of the present application.
[0032] Icons: 10-anti-vascular injection syringe; 11-injection shell; 111-inner shell; 112-outer shell; 1121-connecting port; 113-cavity; 114-valve disc; 12-needle seat; 121-first channel; 122-second channel; 13-injection needle; 14-push member; 141-push block; 1411-first slot; 142-push rod; 1421-push rod; 1422-push plate; 14221-second slot; 15-blocking member; 151-first end; 152-second end; 153-blocking head; 154-lifting rod; 1541-rod body; 20-injection device for urethral filling agent; 30-syringe connector; 31-first barrel; 32-second barrel; 321-first section; 322-second section; 40-endoscope. DETAILED DESCRIPTION
[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.
[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.
[0035] In the description of this application, it should be noted that the terms "inside" and "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0036] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Example
[0037] The present invention provides a syringe 10 that prevents injection into blood vessels. Figure 1 and Figure 5 , which includes an injection housing 11 , a needle seat 12 , an injection needle 13 , an injection pusher 14 and a blocking member 15 .
[0038] The injection housing 11 includes an inner housing 111 and an outer housing 112 spaced apart, with a cavity 113 formed between the inner housing 111 and the outer housing 112. The needle seat 12 is provided with a first channel 121 and a second channel 122 connected to each other. The first channel 121 passes through the needle seat 12 in the axial direction, and the second channel 122 is connected to the cavity 113 (refer to FIG. Figure 2 ).
[0039] The injection needle 13 is installed in the first channel 121 , and one end of the pusher 14 is installed inside the inner housing 111 and slidably connected to the inner wall of the inner housing 111 . The interior of the inner housing 111 is used for pre-filling the filler.
[0040] The blocking member 15 is provided through the push member 14 and can move along the length direction of the push member 14. The blocking member 15 has a first end 151 and a second end 152. The first end 151 blocks the first channel 121, and the second end 152 is provided outside the end of the push member 14 away from the injection housing 11. The end of the second channel 122 is located between the first end 151 of the blocking member 15 and the end of the injection needle 13 installed in the first channel 121 (refer to Figure 2 ), the blocking member 15 separates the interior of the inner shell 111 from the injection needle 13, and the pre-installed filler in the inner shell 111 is separated from the injection needle 13 by the blocking member 15. The interior of the injection needle 13, the second channel 122 and the cavity 113 form a connecting channel. The outer shell 112 is used to connect a suction mechanism to suck the cavity 113 to form a negative pressure. The connected suction mechanism can suck the cavity 113 and form a negative pressure. Exemplarily, the suction mechanism is a negative pressure drainage ball, which forms a negative pressure by squeezing the negative pressure drainage ball to expel the air. In other embodiments, it can also be a suction pump, etc., as long as it can achieve suction to form a negative pressure.
[0041] The syringe 10 of the present application that prevents injection into blood vessels, when the injection needle 13 is inserted into the target position of the skin, the cavity 113 formed between the inner shell 111 and the outer shell 112 is sucked to form a negative pressure through the connected suction mechanism. If the injection needle 13 is inserted into the blood vessel, the returned blood will enter the cavity 113 from the second channel 122 after the injection needle, so that it can be judged whether the injection needle 13 is inserted into the blood vessel by whether there is returned blood. If the injection needle 13 is inserted into the blood vessel, a new point is found for injection. Optionally, the outer shell 112 is transparent, which makes it easier to observe whether there is returned blood. During the suction process, the suction channel does not contain filler, thereby reducing the resistance to backdrawing. Moreover, since the blocking member 15 separates the interior of the inner shell 111 and the injection needle 13, the returned blood will not enter the interior of the inner shell 111 and mix with the filler, which can improve the contamination of the filler by the returned blood.
[0042] After confirming that the injection needle 13 is not inserted into the blood vessel, the blocking member 15 is pulled up to move along the length direction of the pusher 14, and the first end 151 of the blocking member 15 is separated from the first channel 121, so that the interior of the inner housing 111 is connected to the injection needle 13 (refer to Figure 5 ), and then push the pusher 14 to push the filler pre-installed in the inner shell 111 into the injection needle 13 through the first channel 121 and then inject it into the target position.
[0043] In some embodiments, the cavity 113 or the second channel 122 is provided with a valve flap 114. The valve flap 114 is made of a flexible material. One end of the valve flap 114 is fixedly connected to the inner wall of the cavity 113 or the second channel 122. The inner wall of the valve flap 114 can form a one-way valve. When the suction mechanism is sucked to form a negative pressure, the valve flap 114 opens toward the end away from the injection needle 13 (see FIG. Figure 3 When blood returns, it is drawn from the open position of valve flap 114 through cavity 113 into the suction mechanism. When the suction mechanism returns to normal, negative pressure is eliminated and valve flap 114 closes, blocking second channel 122. This prevents residual blood in cavity 113 from flowing back into second channel 122. Furthermore, valve flap 114 prevents filler from entering cavity 113 through second channel 122, which could cause waste.
[0044] Exemplarily, the valve flap 114 is installed in the cavity 113 near the second channel 122, and one end is connected to the inner wall of the cavity 113. When the valve flap 114 is closed, the second channel 122 can be closed. When the valve flap 114 is opened, the cavity 113 and the second channel 122 can be connected.
[0045] In another embodiment, the valve flap 114 is installed in the second channel 122. The second channel 122 includes a first area and a second area arranged in sequence along the inside to outside direction of the needle seat 12. The inner diameter of the second area is larger than the inner diameter of the first area. The valve flap 114 is arranged at a position close to the first area in the second area. When the valve flap 114 is opened, the returning blood can enter the cavity 113 through the first area and the second area and then be sucked by the suction mechanism. When the valve flap 114 is closed, the first area and the second area are separated, and the second channel 122 is closed, so that the blood cannot flow back to the second channel 122.
[0046] Reference Figure 1-Figure 5 In some embodiments, the blocking member 15 includes a blocking head 153 and a lifting rod 154 connected to the blocking head 153. The injection member 14 includes an injection block 141 that can slide with the inner wall of the inner shell 111 and an injection rod 142 connected to the injection block 141; wherein, the injection block 141 is made of rubber material, and can maintain good sealing during the sliding fit with the inner wall of the inner shell 111, and has a certain friction force, which can not only achieve the effect of slow injection, but also ensure that the filler will not leak from the gap and can be injected out. A first card slot 1411 is provided at the end of the injection block 141 close to the injection needle 13, and the blocking head 153 can be snapped into the first card slot 1411. When the sealing head 153 is separated from the first channel 121 and enters the interior of the inner shell 111 through the lifting rod 154, and then is embedded in the first slot 1411 of the injection block 141, it is convenient to drive the injection block 141 to move through the injection rod 142, and the injection rod 142 and the injection block 141 are not hindered by the sealing part 15 when moving.
[0047] Exemplarily, the inner diameter of the end of the first slot 1411 close to the second end 152 is smaller than the inner diameter of the end close to the first end 151, the outer diameter of the end of the sealing head 153 close to the second end 152 is smaller than the outer diameter of the end close to the first end 151, and the shape and size of the sealing head 153 match those of the first slot 1411, thereby facilitating the sealing head 153 to enter the first slot 1411 and be able to be clamped in the first slot 1411.
[0048] For example, the thickness of the plugging head 153 is the same as the depth of the first engaging groove 1411. When the plugging head 153 is engaged with the first engaging groove 1411, the surface of the plugging head 153 is flush with the surface of the injection block 141. When the injection block 141 and the plugging head 153 move to the bottom of the inner shell 111, since the surface of the plugging head 153 is flush with the injection block 141, it is easier to completely inject the filler in the inner shell 111. If the surface of the plugging head 153 protrudes from the injection block 141, the plugging head 153 will first abut against the bottom of the inner shell 111 before the injection block 141 reaches the bottom of the inner shell 111. As a result, the filler in the inner shell 111 cannot be completely injected, resulting in a certain amount of waste.
[0049] Furthermore, the lifting rod 154 includes a multi-section rod body 1541, and two adjacent sections of the rod body 1541 are hinged; the injection rod 142 includes a push rod 1421 and a push plate 1422. The two ends of the push rod 1421 are respectively connected to the injection block 141 and the push plate 1422. The push plate 1422 is provided with a second clamping groove 14221, and the rod body 1541 can be clamped in the second clamping groove 14221. The two adjacent sections of the lifting rod 1541 are hinged, so that the adjacent sections of the rod body 1541 can fold with each other. When the rod body 1541 is clamped in the second clamping groove 14221 of the push plate 1422 (refer to Figure 6 ), which can conveniently operate the push plate 1422 to apply force to push the push plate 1422.
[0050] Optionally, when the rod 1541 is clamped in the second clamping groove 14221, the surface of the rod 1541 is flush with the surface of the push plate 1422. Then, the surface of the rod 1541 does not protrude from the surface of the push plate 1422, which makes it more convenient to perform injection when the push plate 1422 is pushed.
[0051] In addition, the outer shell 112 is provided with a connection port 1121, which communicates with the cavity 113 and is connected to a suction mechanism (not shown) via a connecting pipe (not shown). After the suction mechanism is used to aspirate the cavity 113, the connecting pipe can be removed from the connection port 1121, thereby disassembling the suction mechanism and facilitating subsequent injection operations. Optionally, the connection port 1121 is provided with a connecting wall protruding from the outer wall of the outer shell 112, and the connecting pipe is threadedly connected to the connecting wall. In other embodiments, the connecting pipe and the connection port 1121 can also be detachably connected by other means, such as by plugging or snapping.
[0052] Exemplarily, a blocking post (not shown) is connected to the outer shell 112. One end of the blocking post is connected to the side of the connection port 1121, and the blocking post is capable of blocking the connection port 1121. After the connecting pipe is removed from the connection port 1121, the blocking post can be used to block the connection port 1121, thereby preventing the filler from leaking from the connection port 1121. Optionally, the blocking post is connected to the outer shell 112 via a connecting belt. The connecting belt can be bent to facilitate moving the blocking post from the side of the connection port 1121 to the connection port 1121 to block the connection port 1121.
[0053] This embodiment also provides an injection device 20 for urethral filler (see Figure 7 ), includes the above-mentioned anti-vascular injection syringe 10 and syringe connector 30, the syringe connector 30 includes a first barrel 31 and a second barrel 32 of an integrated structure, the first barrel 31 is used to install the endoscope 40, the second barrel 32 is used to install the anti-vascular injection syringe 10, and the injection needle 13 of the anti-vascular injection syringe 10 can extend out of the second barrel 32 from the inside of the second barrel 32.
[0054] During use, the syringe 10 that prevents injection into blood vessels is inserted into the second barrel 32 of the injection device, the endoscope 40 is installed on the first barrel 31, and then the assembled injection device is inserted into the urethra. With the assistance of the endoscope 40, the position where the injection device enters the urethra can be observed, and then the injection needle 13 of the syringe 10 that prevents injection into blood vessels is inserted into the target position. Whether the blood vessel is inserted is determined by whether there is blood return. When there is no blood return, the blood vessel is not inserted and the filler can be injected.
[0055] Optionally, the inner cavity of the second barrel 32 includes a first section 321 and a second section 322, and the angle between the central axis of the second section 322 and the central axis of the first section 321 is an acute angle or a right angle. When the injection needle 13 of the anti-vascular injection syringe 10 is inserted from the second section 322 into the first section 321 and then extends through the port of the second barrel 32, the injection housing 11 of the anti-vascular injection syringe 10 forms an acute angle or a right angle with the main body of the first barrel 31, which facilitates push injection of the anti-vascular injection syringe 10.
[0056] In summary, the syringe 10 for preventing blood vessel injection and the injection device 20 for urethral fillers of the present application have a suction mechanism that suctions the space formed between the inner housing 111 and the outer housing 112. The blocking member 15 blocks the first channel 121, and the end of the second channel 122 is located between the first end 151 of the blocking member 15 and the end of the injection needle 13 mounted on the first channel 121. The blocking member 15 separates the filler pre-installed in the inner housing 111 from the injection needle 13. When the injection needle 13 is inserted into the target skin location, if the injection needle 13 is inserted into a blood vessel, blood will return through the injection needle 13 from the second channel 122 into the cavity 113. Therefore, whether the injection needle 13 is inserted into a blood vessel can be determined by the presence of blood return. The suction channel does not contain filler, thereby reducing the resistance to backflow. Furthermore, since the blocking member 15 separates the interior of the inner housing 111 from the injection needle 13 , the returned blood will not enter the interior of the inner housing 111 and mix with the filler, thereby reducing the contamination of the filler by the returned blood.
[0057] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.
Claims
1. A syringe that prevents injection into blood vessels, characterized in that: include: An injection housing, the injection housing comprising an inner housing and an outer housing spaced apart, a cavity being formed between the inner housing and the outer housing, the outer housing being used to connect to a suction mechanism to suction the cavity to form a negative pressure; A needle seat, wherein the needle seat is provided with a first channel and a second channel connected to each other, the first channel axially passes through the needle seat, and the second channel is connected to the cavity; an injection needle, the injection needle being installed in the first channel; a pusher, one end of which is mounted inside the inner shell and slidably connected to the inner wall of the inner shell; as well as A blocking member, which is passed through the push member and can move along the length direction of the push member, has a first end and a second end, the first end blocks the first channel, and the second end is arranged outside the end of the push member away from the injection shell; the port of the second channel is located between the first end of the blocking member and the end of the injection needle installed in the first channel.
2. The syringe for preventing blood vessel injection according to claim 1, characterized in that: The sealing member includes a sealing head and a lifting rod connected to the sealing head, and the pushing member includes a pushing block that can slidably cooperate with the inner wall of the inner shell and a pushing rod connected to the pushing block; a first card slot is provided at one end of the pushing block close to the injection needle, and the sealing head can be embedded in the first card slot.
3. The syringe for preventing blood vessel injection according to claim 2, characterized in that: The thickness of the blocking head is the same as the depth of the first slot. When the blocking head is inserted into the first slot, the surface of the blocking head is flush with the surface of the injection block.
4. The syringe for preventing blood vessel injection according to claim 2, characterized in that: The lifting rod includes a multi-section rod body, and two adjacent sections of the rod body are hinged; the pushing rod includes a push rod and a push plate, and the two ends of the push rod are respectively connected to the pushing block and the push plate. The push plate is provided with a second card slot, and the rod body can be clamped in the second card slot.
5. The syringe for preventing blood vessel injection according to claim 4, characterized in that: When the rod body is locked in the second locking groove, the surface of the rod body is flush with the surface of the push plate.
6. The syringe for preventing blood vessel injection according to any one of claims 1 to 5, characterized in that: The outer shell is transparent.
7. The syringe for preventing injection into blood vessels according to any one of claims 1 to 5, characterized in that: The outer shell is provided with a connecting port, the connecting port is communicated with the cavity, the connecting port is connected to a suction mechanism via a connecting pipe, and the connecting pipe is detachably connected to the connecting port.
8. The syringe for preventing blood vessel injection according to claim 7, characterized in that: The outer shell is connected to a blocking column, one end of which is connected to the side of the connecting port, and the blocking column can block the connecting port.
9. The syringe for preventing blood vessel injection according to any one of claims 1 to 5, characterized in that: The cavity or the second channel is equipped with a valve flap, one end of which is connected to the inner wall of the cavity or the inner wall of the second channel and can form a one-way valve; when suction forms a negative pressure, the valve flap opens toward the end away from the injection needle to allow liquid to pass through; when no negative pressure is formed, the valve flap closes the second channel.
10. An injection device for urethral bulking agent, characterized in that: include: The syringe that prevents injection into a blood vessel according to any one of claims 1 to 9; as well as A syringe connector includes a first barrel and a second barrel of an integral structure, wherein the first barrel is used to mount an endoscope, and the second barrel is used to mount the syringe that prevents injection into blood vessels, wherein the injection needle of the syringe that prevents injection into blood vessels can extend out of the second barrel from the interior of the second barrel.