Flow-adjustable nasal feeding infusion device
By designing a nasal feed infusion device that can adjust the flow, using fixing devices, guide devices, expansion devices and adjustment devices, the problems of blockage of debris inside the nasal cavity and unstable tape fixation are solved, and the stable insertion and flow rate adjustment of the nasal feeding tube are achieved, and the patient's comfort is improved.
Patent Information
- Application Number
- CN202510139100.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2025-05-06
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When inserting, existing nasogastric tubes are easily difficult to insert due to blockage of debris inside the nasal cavity, and the tape is unstable, which can easily cause the nasogastric tube to slide and shift. Patients may also experience discomfort reactions such as itching.
A nasofetal infusion device with adjustable flow is designed, including fixing devices, guide devices, expansion devices and adjustment devices. The fixing device drives the expansion device to rotate, clean up debris inside the nasal cavity, and uses a Velcro fixing device to ensure stable insertion of the nasal feeding tube. The adjustment device adjusts the fluid flow rate by squeezing the nasal feeding tube to avoid discomfort in the patient.
It effectively solves the problem of obstruction in the nasal cavity, improves the stability and fixation of the nasal feeding tube, avoids the slip and deviation of the nasal feeding tube, and reduces the patient's discomfort reaction.
Smart Images
Figure CN119925172A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of medical devices, in particular to a nasogastric feeding infusion device with adjustable flow rate. Background Art
[0002] At present, nasogastric tubes are the main medical device used in hospitals to feed liquid food to vegetative patients, patients in cerebral coma, etc., and are widely used. The nasogastric tubes commonly used today usually have the function of adjusting the flow rate to avoid discomfort to the patient due to excessively fast flow rate inside the nasogastric tube during infusion. However, the nasogastric tube under current technology is just a smooth rubber tube. When the nasogastric tube is inserted, the bedridden elderly patients feel uncomfortable, but it is inconvenient to fix the patient's head. At this time, the patient's head shakes unconsciously, and the patient's nasal cavity is not cleaned frequently. The debris accumulated in the nasal cavity will affect the insertion of the nasogastric tube and increase the difficulty of intubation. At present, after the nasogastric tube is inserted, the nasogastric tube is usually pasted to the patient's nose with tape to fix the position of the nasogastric tube. However, the nasogastric tube is generally not replaced frequently, so the replacement cycle is long. The patient's face and nose will secrete a lot of oil, which will cause the viscosity of the tape to gradually decrease, resulting in unstable tape adhesion, which is easy to cause the nasogastric tube to slip and deviate, and the patient is prone to itching. Since the elderly patients have weak autonomous consciousness, they are prone to pulling the nasogastric tube, causing the nasogastric tube to fall off. In view of this, we proposed a nasogastric infusion set with adjustable flow rate. Summary of the invention
[0003] The object of the present invention is to provide a nasogastric feeding infusion set with adjustable flow rate to solve the problems raised in the above-mentioned background technology.
[0004] To achieve the above-mentioned purpose, a nasogastric infusion set with adjustable flow rate is provided, comprising a shell, a fixing device is arranged inside the shell, a guide device is arranged on the lower side of the fixing device, the guide device is used to guide and limit the fixing device, an expansion device is arranged on one side of the fixing device, after the fixing device moves to a certain position, the fixing device drives the expansion device to rotate, so that the expansion device opens the nasal cavity on the side where the nasogastric tube is inserted and supports and expands the nasal cavity, an adjustment device is arranged inside the shell, the adjustment device is located on the side of the fixing device away from the expansion device, after the fixing device fixes the nasogastric tube, the adjustment device is adjusted so that the adjustment device squeezes the nasogastric tube, so that the adjustment device adjusts the flow rate of the liquid inside the nasogastric tube.
[0005] As a further improvement of the present technical solution, the shell includes a shell, a fixed chamber and an adjusting chamber located on one side of the fixed chamber are opened inside the shell, the fixing device and the guide device are located inside the fixed chamber, the adjusting device is located inside the adjusting chamber, a through opening is opened on the side of the fixed chamber away from the adjusting chamber, the expansion device is located inside the through opening, connecting buckles are fixedly connected on both sides of the shell, and Velcro is fixedly connected to the outer surface of the connecting buckle.
[0006] As a further improvement of the present technical solution, the fixing device includes two fixing blocks, the adjacent side surfaces of the two fixing blocks are both arranged as arc-shaped surfaces, the adjacent side surfaces of the two fixing blocks are both fixedly connected with rubber friction pads, the upper sides of the two fixing blocks are both fixedly connected with first tooth plates, the teeth of the two first tooth plates are arranged on the adjacent side surfaces of the two first tooth plates, a first gear is meshed between the adjacent side surfaces of the two first tooth plates, a driving rod is fixedly connected with the upper side of the first gear, the driving rod passes through the shell and extends out, and the driving rod is rotatably arranged on the shell.
[0007] As a further improvement of the present technical solution, limiting grooves are provided on the upper surfaces of the two fixed blocks, limiting strips are arranged inside the limiting grooves, and the two limiting strips are respectively installed on the lower sides of the two first tooth plates. When the two fixed blocks move toward each other or in the opposite direction, the limiting strips slide inside the limiting grooves.
[0008] As a further improvement of the present technical solution, the expansion device includes an expansion plate, a T-bar is fixedly connected to one side of the expansion plate, the upper and lower sides of the horizontal bar of the T-bar are fixedly connected to the second gear, a rotating shaft is rotatably arranged inside the vertical bar of the T-bar, both ends of the rotating shaft respectively pass through two second gears and extend out, and the rotating shaft is rotatably arranged in the through opening.
[0009] As a further improvement of the technical solution, two grooves are provided on one side of the two fixed blocks close to the expansion plate, and a second tooth plate is fixedly connected to a position inside the groove away from the other groove, and the second tooth plate is meshed with the second gear.
[0010] As a further improvement of the present technical solution, after the fixed blocks move toward each other to a certain position, the second gear is driven to rotate by the engagement of the second tooth plate with the second gear, so that the two expansion plates are opened inside the nasal cavity on the side where the nasogastric tube is inserted and support and expand the nasal cavity.
[0011] As a further improvement of the present technical solution, the guide device includes a guide bar, the two fixed blocks are slidably arranged on the guide bar, an ejection block groove is opened on the upper surface of the guide bar, an ejection block is slidably arranged inside the ejection block groove, an ejection spring located inside the ejection block groove is fixedly connected to the lower side of the ejection block, and the ejection spring is used to apply an upward thrust to the ejection block.
[0012] As a further improvement of the present technical solution, the adjusting device includes a telescopic rod, the fixed rod end of the telescopic rod is hinged on the shell, a screw is rotatably arranged inside the adjusting chamber, the screw passes through the shell and extends out, the external thread of the screw is connected with a screw sleeve, and the piston rod end of the telescopic rod is hinged on the screw sleeve.
[0013] Compared with the prior art, the present invention has the following beneficial effects:
[0014] In the nasogastric infusion device with adjustable flow rate, the expansion plate is driven to rotate when the fixed block moves, so that the expansion plate scrapes away the debris inside the nasal cavity on the side where the nasogastric tube needs to be inserted, so as to facilitate the insertion of the nasogastric tube. After the nasogastric tube is inserted into the designated position, the driving rod is rotated to make the fixed block clamp and fix the nasogastric tube. At the same time, the expansion plate squeezes the inner wall of the nasal cavity, so as to fix the device in front of the nasal cavity on the side where the nasogastric tube is inserted, so as to prevent the nasogastric tube from falling off. At the same time, it is avoided that when the nasogastric tube is fixed with adhesive tape, the patient has discomfort reactions such as itching and pulls the nasogastric tube to make it fall off. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is one of the overall structural schematic diagrams of the present invention;
[0016] Figure 2 This is the second schematic diagram of the overall structure of the present invention;
[0017] Figure 3 It is a schematic cross-sectional structural diagram of the housing of the present invention;
[0018] Figure 4 It is one of the cross-sectional structural schematic diagrams of the present invention;
[0019] Figure 5 This is the second schematic cross-sectional view of the present invention;
[0020] Figure 6 It is one of the partial structural schematic diagrams of the present invention;
[0021] Figure 7 This is the second schematic diagram of the partial structure of the present invention;
[0022] Figure 8 It is a schematic cross-sectional view of the structure of the fixing block and the expansion device of the present invention;
[0023] Fig. 9 It is a schematic cross-sectional structural diagram of the guide device of the present invention.
[0024] The meaning of each number in the figure is:
[0025] 1. Shell; 11. Shell; 12. Fixed chamber; 13. Through port; 14. Adjustment chamber; 2. Protective rubber pad; 3. Connecting buckle; 4. Velcro; 5. Fixing device; 51. Fixed block; 52. Rubber friction pad; 53. First tooth plate; 54. Limiting strip; 55. Limiting groove; 56. First gear; 57. Driving rod; 6. Guide device; 61. Guide strip; 62. Ejection block; 63. Ejection spring; 7. Expansion device; 71. Expansion plate; 72. T-bar; 73. Second gear; 74. Groove; 75. Second tooth plate; 76. Rotating shaft; 8. Adjusting device; 81. Telescopic rod; 82. Screw sleeve; 83. Screw. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0028] Example 1
[0029] See also Figure 1-Figure 9As shown, the purpose of this embodiment is to provide a nasogastric infusion set with adjustable flow rate, including a shell 1, a fixing device 5 is arranged inside the shell 1, a guide device 6 is arranged on the lower side of the fixing device 5, the guide device 6 is used to guide and limit the movement of the fixing device 5, and an expansion device 7 is arranged on one side of the fixing device 5. When the fixing device 5 moves to a certain position, the expansion device 7 is driven to rotate by the fixing device 5, so that the expansion device 7 opens the nasal cavity on the side where the nasogastric tube is inserted and supports and expands the nasal cavity, which not only enhances the fixing effect of the device in the nasal cavity, but also can scrape away foreign matter in the nasal cavity, so as to avoid the failure of intubation due to blockage in the nasal cavity when the nasogastric tube is inserted. An adjusting device 8 is arranged inside the shell 1, and the adjusting device 8 is located on the side of the fixing device 5 away from the expansion device 7. When the fixing device 5 fixes the nasogastric tube, the adjusting device 8 is adjusted to squeeze the nasogastric tube, so that the adjusting device 8 adjusts the flow rate of the liquid inside the nasogastric tube, so as to avoid the situation where the patient feels uncomfortable due to excessive flow rate of the liquid inside the nasogastric tube.
[0030] See also Figure 1-Figure 5 As shown, the shell 1 includes a shell 11, a fixed chamber 12 and an adjusting chamber 14 located on one side of the fixed chamber 12 are opened inside the shell 11, a fixing device 5 and a guiding device 6 are located inside the fixed chamber 12, an adjusting device 8 is located inside the adjusting chamber 14, a through opening 13 is opened on the side of the fixed chamber 12 away from the adjusting chamber 14, an expansion device 7 is located inside the through opening 13, the lower surface of the shell 11 is arranged as an arc surface, and the lower surface of the shell 11 is fitted with the installation position through the arrangement of the arc surface, a protective rubber pad 2 is fixedly connected to the lower surface of the shell 11, and the arrangement of the protective rubber pad 2 can buffer the squeezing force of the shell 11 on the skin, so as to avoid the shell 11 squeezing the skin for a long time and causing discomfort to the patient, connecting buckles 3 are fixedly connected on both sides of the shell 11, and Velcro 4 is fixedly connected to the outer surface of the connecting buckle 3, and when the shell 11 is placed in an appropriate position, the ends of the two Velcro 4 are pasted and fixed at the back of the patient's head to fix the position of the shell 11.
[0031] See also Figure 6-Figure 7As shown, the fixing device 5 includes two fixing blocks 51, and the adjacent sides of the two fixing blocks 51 are both arranged in an arcuate surface. The fixing blocks 51 are arranged in an arcuate surface so that the fixing blocks 51 fit the surface of the nasogastric tube. The adjacent sides of the two fixing blocks 51 are fixedly connected with rubber friction pads 52. When the two fixing blocks 51 clamp the nasogastric tube, the friction between the fixing blocks 51 and the nasogastric tube is increased by the arrangement of the rubber friction pads 52, thereby enhancing the fixing effect of the device on the nasogastric tube. A first gear 56 is arranged on the upper side of the fixing block 51, and a driving rod 57 is fixedly connected to the upper side of the first gear 56. The driving rod 57 is driven by the driving rod 57. The movable rod 57 penetrates the shell 11 and extends out. The driving rod 57 is rotatably set on the shell 11. The upper sides of the two fixed blocks 51 are fixedly connected with the first tooth plates 53. The teeth of the two first tooth plates 53 are set on the adjacent sides of the two first tooth plates 53. The first gear 56 is meshed between the two first tooth plates 53. When the rotating driving rod 57 drives the first gear 56 to rotate, the meshing between the first gear 56 and the two first tooth plates 53 drives the two first tooth plates 53 to move toward each other, so that the two fixed blocks 51 are moved and the nasogastric tube is clamped and fixed.
[0032] See also Figure 6 and Figure 7 As shown, the upper surfaces of the two fixed blocks 51 are provided with limit grooves 55, and the limit strips 54 are arranged inside the limit grooves 55. The two limit strips 54 are respectively installed on the lower sides of the two first tooth plates 53. When the two fixed blocks 51 move toward each other or move in the opposite direction, the limit strips 54 slide inside the limit grooves 55. In the process of the first tooth plate 53 driving the movement of the fixed block 51, the stability of the first tooth plate 53 is enhanced by sliding the limit strip 54 fixed on the lower side of the first tooth plate 53 in the limit groove 55, so as to avoid the part of the first tooth plate 53 that exceeds the fixed block 51 and cannot be fixed, resulting in deformation of the first tooth plate 53 after long-term use, making the device unable to be used normally.
[0033] See also Figure 3 , Figure 6 and Fig. 9 As shown, the guide device 6 includes a guide bar 61, and two fixed blocks 51 are slidably arranged on the guide bar 61. The fixed blocks 51 are guided and limited by sliding on the guide bar 61 to prevent the fixed blocks 51 from sliding sideways during movement. An ejection block groove is provided on the upper surface of the guide bar 61, and an ejection block 62 is slidably arranged inside the ejection block groove. The fixed block 51 is provided with an arc groove matching the ejection block 62, and an ejection spring 63 located inside the ejection block groove is fixedly connected to the lower side of the ejection block 62. When the fixed block 51 moves to a certain position, the ejection spring 63 applies an upward thrust to the ejection block 62 to eject the ejection block 62, and the ejection block 62 is stuck in the arc groove, so as to fix the positions of the two fixed blocks 51, and prevent the fixed block 51 from sliding sideways in the process of clamping and fixing the nasogastric tube by the fixed block 51, resulting in reduced fixing effect of the nasogastric tube.
[0034] See also Figure 1 , Figure 6 and Figure 8 As shown, the expansion device 7 includes an expansion plate 71, a T-shaped rod 72 is fixedly connected to one side of the expansion plate 71, and the upper and lower sides of the horizontal rod of the T-shaped rod 72 are fixedly connected to the second gear 73, and a rotating shaft 76 is rotatably arranged inside the vertical rod of the T-shaped rod 72. The two ends of the rotating shaft 76 respectively penetrate the two second gears 73 and extend out, and the rotating shaft 76 is rotatably arranged in the through hole 13. Two grooves 74 are provided on one side of the two fixed blocks 51 close to the expansion plate 71, and a second tooth plate 75 is fixedly connected to the position of the groove 74 away from the other groove 74. The second tooth plate 75 is fixedly connected to the second tooth plate 75. The tooth plate 75 is meshed with the second gear 73. When the fixed block 51 moves to a certain position, the second gear 73 begins to contact the second tooth plate 75. As the fixed block 51 continues to move, the meshing between the second tooth plate 75 and the second gear 73 drives the second gear 73 to rotate, thereby driving the expansion plate 71 to rotate, so that the expansion plate 71 is opened in the nasal cavity on the side where the nasogastric tube is inserted, and supports and expands the inside of the nasal cavity, which not only enhances the stability of the device, but also can scrape away debris inside the nasal cavity, avoiding clogging of the nasal cavity by debris and making it inconvenient to insert the tube.
[0035] See also Figure 1 and Figure 5 As shown, the adjusting device 8 includes a telescopic rod 81, a fixed rod end of the telescopic rod 81 is hinged on the shell 11, a screw 83 is rotatably arranged inside the adjusting chamber 14, the screw 83 penetrates the shell 11 and extends out, the screw 83 is externally threadedly connected with a screw sleeve 82, and the piston rod end of the telescopic rod 81 is hinged on the screw sleeve 82. When the fixing block 51 clamps the nasogastric tube, the screw 83 is rotated to make the telescopic rod 81 hinged on the screw sleeve 82 squeeze the nasogastric tube, so as to adjust the flow rate of the liquid in the nasogastric tube and avoid discomfort to the patient due to excessively fast flow rate of the liquid in the nasogastric tube.
[0036] When the flow-adjustable nasogastric infusion device of the present embodiment is used, the user first places the shell 11 in front of the nasal cavity on the side where the nasogastric tube needs to be inserted, sticks the two Velcro strips 4 on the back of the patient's head to fix the position of the shell 11, and then rotates the driving rod 57 to make the two fixing blocks 51 close to each other, so that the two expansion plates 71 rotate to scrape the debris in the nasal cavity to one side, and then inserts the nasogastric tube to avoid the accumulation of debris inside the patient's nasal cavity affecting the insertion of the nasogastric tube. When the nasogastric tube is inserted to the specified position, the driving rod 57 is rotated again to make the two fixing blocks 51 clamp the nasogastric tube to prevent the nasogastric tube from falling off when the patient shakes his head when feeling uncomfortable. At the same time, the two expansion plates 71 support and fix the inside of the nasal cavity to increase the stability of the device, and then rotates the screw 83 to make the telescopic rod 81 hinged on the screw sleeve 82 squeeze the nasogastric tube. The flow rate of the liquid inside the nasogastric tube can be adjusted by adjusting the squeezing force of the telescopic rod 81 on the nasogastric tube to avoid discomfort to the patient caused by excessively fast flow rate of the liquid in the nasogastric tube.
[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. A nasogastric feeding infusion set with adjustable flow rate, comprising a housing (1), characterized in that: A fixing device (5) is arranged inside the shell (1), and a guiding device (6) is arranged on the lower side of the fixing device (5). The guiding device (6) is used to guide and limit the fixing device (5). An expansion device (7) is arranged on one side of the fixing device (5). After the fixing device (5) moves to a certain position, the fixing device (5) drives the expansion device (7) to rotate, so that the expansion device (7) opens the nasal cavity on the side where the nasogastric tube is inserted and supports and expands the nasal cavity. An adjusting device (8) is arranged inside the shell (1), and the adjusting device (8) is located on the side of the fixing device (5) away from the expansion device (7). After the fixing device (5) fixes the nasogastric tube, the adjusting device (8) is adjusted so that the adjusting device (8) squeezes the nasogastric tube, so that the adjusting device (8) adjusts the flow rate of the liquid inside the nasogastric tube.
2. The nasogastric feeding infusion device with adjustable flow rate according to claim 1, characterized in that: The housing (1) comprises a shell (11), the shell (11) is provided with a fixed chamber (12) and an adjustment chamber (14) located on one side of the fixed chamber (12), the fixing device (5) and the guiding device (6) are located inside the fixed chamber (12), the adjustment device (8) is located inside the adjustment chamber (14), a through opening (13) is provided on a side of the fixed chamber (12) away from the adjustment chamber (14), the expansion device (7) is located inside the through opening (13), both sides of the shell (11) are fixedly connected with connecting buckles (3), and the outer surface of the connecting buckles (3) is fixedly connected with Velcro (4).
3. The nasogastric feeding infusion device with adjustable flow rate according to claim 2, characterized in that: The fixing device (5) comprises two fixing blocks (51), the adjacent side surfaces of the two fixing blocks (51) are both arranged as arc-shaped surfaces, the adjacent side surfaces of the two fixing blocks (51) are both fixedly connected with rubber friction pads (52), the upper sides of the two fixing blocks (51) are both fixedly connected with first tooth plates (53), the teeth of the two first tooth plates (53) are arranged on the adjacent side surfaces of the two first tooth plates (53), a first gear (56) is meshed between the adjacent side surfaces of the two first gear plates (53), a driving rod (57) is fixedly connected to the upper side of the first gear (56), the driving rod (57) penetrates the housing (11) and extends out, and the driving rod (57) is rotatably arranged on the housing (11).
4. The nasogastric feeding infusion device with adjustable flow rate according to claim 3, characterized in that: The upper surfaces of the two fixed blocks (51) are provided with limit grooves (55), and the limit strips (54) are arranged inside the limit grooves (55). The two limit strips (54) are respectively installed on the lower sides of the two first tooth plates (53). When the two fixed blocks (51) move towards each other or move in the opposite direction, the limit strips (54) slide inside the limit grooves (55).
5. The nasogastric feeding infusion device with adjustable flow rate according to claim 3, characterized in that: The expansion device (7) comprises an expansion plate (71), one side of the expansion plate (71) is fixedly connected to a T-shaped rod (72), the upper side and the lower side of the horizontal rod of the T-shaped rod (72) are fixedly connected to a second gear (73), a rotating shaft (76) is rotatably arranged inside the vertical rod of the T-shaped rod (72), two ends of the rotating shaft (76) respectively penetrate two second gears (73) and extend out, and the rotating shaft (76) is rotatably arranged in the through opening (13).
6. The nasogastric feeding infusion device with adjustable flow rate according to claim 5, characterized in that: Two grooves (74) are provided on one side of the two fixing blocks (51) close to the expansion plate (71), and a second tooth plate (75) is fixedly connected to a position inside the groove (74) away from the other groove (74), and the second tooth plate (75) is meshed with the second gear (73).
7. The nasogastric feeding infusion device with adjustable flow rate according to claim 6, characterized in that: After the fixing blocks (51) move toward each other to a certain position, the fixing blocks (51) drive the second gear (73) to rotate through the meshing of the second tooth plate (75) and the second gear (73), so that the two expansion plates (71) are opened inside the nasal cavity on the side where the nasogastric tube is inserted and support and expand the nasal cavity.
8. The nasogastric feeding infusion device with adjustable flow rate according to claim 3, characterized in that: The guide device (6) comprises a guide bar (61), the two fixed blocks (51) are slidably arranged on the guide bar (61), an ejection block groove is provided on the upper surface of the guide bar (61), an ejection block (62) is slidably arranged inside the ejection block groove, an ejection spring (63) located inside the ejection block groove is fixedly connected to the lower side of the ejection block (62), and the ejection spring (63) is used to apply an upward thrust to the ejection block (62).
9. The nasogastric feeding infusion device with adjustable flow rate according to claim 2, characterized in that: The adjusting device (8) comprises a telescopic rod (81), the fixed rod end of the telescopic rod (81) is hinged on the housing (11), a screw rod (83) is rotatably arranged inside the adjusting chamber (14), the screw rod (83) penetrates the housing (11) and extends out, the screw rod (83) is externally threadedly connected to a screw rod sleeve (82), and the piston rod end of the telescopic rod (81) is hinged on the screw rod sleeve (82).