A leak detection device on a blood tube production line

Abstract

The present invention relates to the technical field of blood tubes, and discloses a leak detection device on a blood tube production line, comprising: a first sensor for collecting a first air pressure value in a first blood tube, a second sensor for collecting a second air pressure value in a second blood tube, an air supply mechanism for supplying air to the first blood tube and the second blood tube respectively, a first platform provided with a first slide rail, a second platform slidably arranged on the first slide rail, and a first driving mechanism for driving the second platform to slide and switch between an air supply position and a disconnection position; when the second platform is driven to the air supply position by the first driving mechanism, the air supply mechanism is connected to the first blood tube through a first sleeve, and the air supply mechanism is connected to the second blood tube through a second sleeve. The leak detection device of the present invention can detect the air pressure drop of two blood tubes at the same time, can effectively eliminate the influence of temperature on the leak detection result, and improve the leak detection accuracy of the blood tubes.

Description

Technical Field

[0001] The invention relates to the technical field of blood tubes, and in particular to a leakage detection device on a blood tube production line. Background Art

[0002] The blood circuit tube, also known as the hemodialysis circuit, is used for hemodialysis treatment and generally includes a circuit and connectors on both sides of the circuit.

[0003] When producing on the production line, a leak detection station is required to detect the leak of the blood tube to ensure that the air tightness of the produced blood tube meets the requirements. In the leak detection station, multiple blood tubes are regularly arranged on a conveyor belt, and the conveyor belt moves along the flow direction of the production line.

[0004] In the prior art, when testing the air tightness of a leaky blood tube, the blood tubes to be tested are generally tested individually one by one. The specific method is: after filling the blood tube to be tested with gas, it is sealed for a period of time, and the change in air pressure in a single blood tube during this period of time is calculated, and the change is compared with a preset pressure drop threshold. If the air pressure drop of the blood tube is greater than the pressure drop threshold, the blood tube fails.

[0005] However, the existing method has a leakage error of about 10%, that is, 10% of the blood tubes judged as unqualified are actually qualified products. This is because the blood tube is made of soft material, and its actual volume expands due to the expansion of inflation when inflated, resulting in a decrease in the gas pressure in the blood tube, an additional pressure drop, and inaccurate measurement.

[0006] In the prior art, when a constant pressure drop threshold is used to test blood tubes produced at different temperatures, errors will inevitably occur due to the different expansion coefficients of the blood tubes. At the same time, because the expansion coefficient of the blood tube is greatly affected by the ambient temperature, it is difficult to define the pressure drop threshold at each temperature, which makes it difficult to eliminate such errors. Summary of the invention

[0007] The purpose of the present invention is to provide a leakage detection device on a blood tube production line with small leakage detection error.

[0008] In order to achieve the above-mentioned purpose, the present invention provides a leak detection device on a blood tube production line, comprising a first sensor for collecting a first air pressure value in a first blood tube, a second sensor for collecting a second air pressure value in a second blood tube, an air supply mechanism for supplying air to the first blood tube and the second blood tube respectively, a first platform provided with a first slide rail, a second platform slidably arranged on the first slide rail, and a first driving mechanism for driving the second platform to slide and switch between an air supply position and a disconnection position; a first sleeve and a second sleeve respectively connected to the air supply mechanism are provided on the second platform, the first sleeve and the second sleeve are spaced apart in a first horizontal direction, and the first slide rail extends in a second horizontal direction perpendicular to the first horizontal direction; when the second platform is in the disconnection position: a gap is formed between the first sleeve and the first blood tube, and a gap is formed between the second sleeve and the second blood tube; when the second platform is in the air supply position: the air supply mechanism is connected to the first blood tube through the first sleeve, and the air supply mechanism is connected to the second blood tube through the second sleeve.

[0009] Furthermore, a plurality of the first sensor and a plurality of the second sensor are provided.

[0010] Furthermore, it also includes a controller; the controller is used to obtain the first air pressure value and the second air pressure value, and respectively calculate the first air pressure reduction amount of the first air pressure value within a predetermined time and the second air pressure reduction amount of the second air pressure value within a predetermined time; the controller is also used to calculate the difference between the first air pressure reduction amount and the second air pressure reduction amount based on the first air pressure reduction amount and the second air pressure reduction amount, and compare the difference with a preset value.

[0011] Furthermore, it also includes an alarm connected to the controller in communication; when the difference is greater than the preset value, the controller outputs an alarm signal to the alarm.

[0012] Furthermore, it also includes a clamping mechanism for clamping the first blood tube and the second blood tube respectively.

[0013] Further, the clamping mechanism includes: a first clamping block, the first clamping block is connected to the first platform, and the first clamping block is provided with a first upper clamp and a second upper clamp; a second clamping block, the second clamping block is connected to the first platform and is spaced apart from the first clamping block in the vertical direction, and the second clamping block is provided with a first lower clamp and a second lower clamp; and a driving member, the driving member drives the first clamping block to slide and switch between a clamping position and a relaxed position along a predetermined direction; when the first clamping block is in the clamping position: the first upper clamp and the first lower clamp define a first clamping space for clamping the first blood tube, and the second upper clamp and the second lower clamp define a second clamping space for clamping the second blood tube.

[0014] Furthermore, a plurality of the first clamping blocks and the second clamping blocks are respectively provided along the first horizontal direction.

[0015] Furthermore, it also includes a second slide rail and a second driving mechanism; the second slide rail extends along the first horizontal direction, the first platform is slidably arranged on the second slide rail, and the second driving mechanism drives the first platform to slide along the second slide rail.

[0016] Furthermore, the second platforms and the first slide rails are each provided in plurality, the plurality of the second platforms correspond to the plurality of the first slide rails in one-to-one correspondence, the plurality of the second platforms are arranged at intervals along the first horizontal direction, and the plurality of the first slide rails are arranged at intervals along the first horizontal direction.

[0017] Furthermore, the first sleeve and the second sleeve are provided in plurality, the plurality of the first sleeves are arranged at intervals on the second platform along the first horizontal direction, the plurality of the second sleeves are arranged at intervals on the second platform along the first horizontal direction, and one second sleeve is provided between two adjacent first sleeves.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The leak detection device of the present invention can detect the air pressure drop of two blood tubes at the same time, which can effectively eliminate the influence of temperature on the leak detection result and improve the leak detection accuracy of the blood tubes. Specifically, during the leak detection, it is assumed that the leakage of the two blood tubes to a similar extent is a low-probability event, and the leak detection of the two blood tubes is performed at the same time, and the two blood tubes are respectively referenced by the other blood tube. Since the two blood tubes are on the same production line, the temperature and expansion coefficient are similar. If one or both of the blood tubes are unqualified products, when reflected in the difference, the difference will be obviously abnormal. The staff will continue to test the two abnormal blood tubes to determine which one is the unqualified product, and the leak detection is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a stereoscopic diagram of a leak detection device on a blood tube production line according to an embodiment of the present invention.

[0021] Figure 2 It is a front view of a leak detection device on a blood tube production line according to an embodiment of the present invention.

[0022] Figure 3 The figure is a top view of a leak detection device on a blood tube production line according to an embodiment of the present invention.

[0023] Figure 4 It is a left view of a leak detection device on a blood tube production line according to an embodiment of the present invention.

[0024] Figure 5 The present invention is a leak detection device for a blood tube production line. Figure 1 Enlarged view of point A in .

[0025] Figure 6 The present invention is a leak detection device for a blood tube production line. Figure 3 Enlarged view of point B in .

[0026] Figure 7 The present invention is a leak detection device for a blood tube production line. Figure 4 Enlarged view of point C in the figure.

[0027] In the figure, 11, the first blood tube; 12, the second blood tube; 2, the air supply mechanism; 3, the first platform; 31, the first slide rail; 4, the second platform; 41, the first sleeve; 42, the second sleeve; 5, the first driving mechanism; 6, the clamping mechanism; 61, the first clamping block; 611, the first upper chuck; 62, the second clamping block; 621, the first lower chuck; 63, the driving member; 7, the second slide rail; 8, the second driving mechanism. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] 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 directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] See also Figure 1 , 4-7, the embodiment of the present invention discloses a leakage detection device on a blood tube production line, which is used for leak detection of blood tubes on the production line, wherein on the production line, the first blood tube 11 and the second blood tube 12 are the same and are arranged at intervals on a conveyor belt at the leakage detection station, and the conveyor belt moves along a first horizontal direction, and the leakage detection device includes: a first sensor for collecting a first air pressure value in the first blood tube 11, a second sensor for collecting a second air pressure value in the second blood tube 12, an air supply mechanism 2 for supplying air to the first blood tube 11 and the second blood tube 12 respectively, a first platform 3 provided with a first slide rail 31, a second platform 4 slidably arranged on the first slide rail 31, and a first driving mechanism 5 for driving the second platform 4 to slide and switch between an air supply position and a disconnection position. The second platform 4 is provided with a first sleeve 41 and a second sleeve 42 respectively connected to the air supply mechanism 2, the first sleeve 41 and the second sleeve 42 are arranged at intervals along the first horizontal direction, and the first slide rail 31 extends along a second horizontal direction perpendicular to the first horizontal direction. When the second platform 4 is in the disconnected position: a gap is formed between the first sleeve 41 and the first blood tube 11, and a gap is formed between the second sleeve 42 and the second blood tube 12; when the second platform 4 is in the gas supply position: the gas supply mechanism 2 is connected to the first blood tube 11 through the first sleeve 41, and the gas supply mechanism 2 is connected to the second blood tube 12 through the second sleeve 42, so that the gas supply mechanism 2 supplies gas to the first blood tube 11 and the second blood tube 12 respectively. After the gas supply, the first blood tube 11 and the second blood tube 12 are pressurized. At this time, the first sensor at least measures the initial value of the first air pressure value within the predetermined time and the final value of the first air pressure value within the predetermined time, and the second sensor at least measures the initial value of the second air pressure value within the predetermined time and the final value of the second air pressure value within the predetermined time. Among them, in order to ensure the accuracy of leak detection, it is necessary to fill the first blood tube 11 and the second blood tube 12 with gas of a predetermined pressure to ensure that the pressure drop is sufficiently obvious. The gas supply mechanism 2 makes the initial air pressure values ​​in the first blood tube 11 and the second blood tube 12 the same, and the initial air pressure values ​​are large enough to make the pressure drop obvious.

[0034] The leak detection device of this embodiment detects the pressure drop of two blood tubes at the same time, which can effectively eliminate the influence of temperature on the leak detection result and improve the leak detection accuracy of the blood tubes. Specifically, before the leak detection, since the probability of unqualified products is small and the leakage degree of each unqualified product is not completely consistent, it is assumed that the event that two blood tubes leak at the same time and the leakage degree is similar is a low probability event. During the leak detection, the first sensor and the second sensor are used to simultaneously detect the leak of the two blood tubes, and the difference in the pressure drop of the two blood tubes is calculated, that is, the difference between the first pressure drop and the second pressure drop. Since the two blood tubes are on the same production line, the temperature of the first blood tube 11 and the second blood tube 12 are the same and the expansion coefficient is the same. Therefore, if one or both of the blood tubes are unqualified products, the difference will be obviously abnormal. At this time, it can be accurately concluded that at least one of the two blood tubes is leaking. The staff continues to test the two abnormal blood tubes, such as soaking the blood tubes in water and observing bubbles to determine the unqualified products. Therefore, the leakage detection method of this embodiment comprehensively considers the reasons why errors in the prior art are difficult to eliminate, that is, the expansion coefficients of the blood tubes at different temperatures are different, which leads to different pressure drop thresholds of the blood tubes at different temperatures for judging whether they are leaking. Compared with the prior art, this embodiment uses two blood tubes for simultaneous measurement, and makes one of the blood tubes use the other blood tube placed in the same temperature environment as a reference. During the process, the preset value is independent of the temperature, eliminating the influence of temperature on the measurement error, and can accurately and quickly measure the leakage of the two blood tubes.

[0035] Specifically, in one embodiment, the first air pressure reduction amount and the second air pressure reduction amount are calculated manually, and the difference between the first air pressure reduction amount and the second air pressure reduction amount is further calculated.

[0036] Specifically, in another embodiment, a controller is used to automatically calculate the above-mentioned difference to achieve automatic leak detection. This embodiment also includes a controller that is communicatively connected to the first sensor and the second sensor, respectively; the controller is used to obtain the first air pressure value and the second air pressure value, and respectively calculate the first air pressure drop of the first air pressure value within a predetermined time and the second air pressure drop of the second air pressure value within a predetermined time; the controller is also used to calculate the difference between the first air pressure drop and the second air pressure drop based on the first air pressure drop and the second air pressure drop, and compare the difference with a preset value.

[0037] Furthermore, in one embodiment, when the controller is used to automatically calculate the above-mentioned difference, it also includes an alarm connected to the controller in communication; when the difference is greater than the preset value, the controller outputs an alarm signal to the alarm, and the alarm is activated to remind the staff to handle the two blood tubes with abnormal differences.

[0038] Specifically, in one embodiment, the difference is compared with a preset value, specifically, when the difference is greater than the preset value, at least one of the first blood tube 11 and the second blood tube 12 is an unqualified product; when the difference is less than the preset value, both the first blood tube 11 and the second blood tube 12 are qualified products.

[0039] Specifically, in one implementation, see Figure 5 -6. Since there are multiple blood tubes on the production line and they are spaced apart along the first horizontal direction, in order to increase the leakage detection speed, the multiple blood tubes on the production line are divided into a first blood tube 11 and a second blood tube 12 in sequence. The first sensor and the second sensor are each provided with multiple ones, and the multiple first blood tubes 11 and the second blood tubes 12 are collected at the same time, and the leak detection of the multiple first blood tubes 11 and the second blood tubes 12 is performed to increase the leakage detection speed.

[0040] Specifically, in one implementation, see Figure 1 -7, from Figure 6 As can be seen, the outer edges of the first blood tube 11 and the second blood tube 12 are both provided with protrusions. In order to ensure the connection between the first blood tube 11 and the gas supply mechanism 2, and the connection between the second blood tube 12 and the gas supply mechanism 2, the present embodiment also includes a clamping mechanism 6 for clamping the first blood tube 11 and the second blood tube 12 respectively, so that the first blood tube 11 and the second blood tube 12 will not move unexpectedly during the gas supply and pressure-maintaining leak detection process. After the clamping mechanism 6 is set, when the second platform 4 is in the gas supply position, the first blood tube 11 is inserted into the first sleeve 41, and the second blood tube 12 is inserted into the second sleeve 42. The first driving mechanism 5 provides a force to press the second platform 4 in the direction of the blood tubes, so that the end faces of the first sleeve 41 and the second sleeve 42 are pressed against the corresponding protrusions, so that the openings of the first sleeve 41 and the second sleeve 42 are respectively isolated from the outside world.

[0041] Specifically, in one implementation, see Figure 7The clamping mechanism 6 includes: a first clamping block 61, a second clamping block 62, and a driving member 63; the first clamping block 61 is connected to the first platform 3, and the first clamping block 61 is provided with a first upper clamp 611 and a second upper clamp; the second clamping block 62 is connected to the first platform 3 and is spaced apart from the first clamping block 61 in the vertical direction, and the second clamping block 62 is provided with a first lower clamp 621 and a second lower clamp; the driving member 63 drives the first clamping block 61 to slide and switch between a clamping position and a relaxed position along a predetermined direction; when the first clamping block 61 is in the clamping position: the first upper clamp 611 and the first lower clamp 621 define a first clamping space for clamping the first blood tube 11, and the second upper clamp and the second lower clamp define a second clamping space for clamping the second blood tube 12.

[0042] Specifically, in one implementation, see Figure 1 -3 and Figure 5 The first clamping blocks 61 and the second clamping blocks 62 are respectively provided in plurality along the first horizontal direction so as to clamp the plurality of first blood tubes 11 and the plurality of second blood tubes 12 .

[0043] Specifically, in one implementation, see Figure 1 and 5 , further comprising a second slide rail 7 and a second drive mechanism 8; the first platform 3 is slidably mounted on the second slide rail 7, and the second drive mechanism 8 drives the first platform 3 to slide along the second slide rail 7, so that the first sleeve 41 and the second sleeve 42 follow the conveyor belt to move, and the conveyor belt does not need to be stopped during leak detection, and the normal production of the preceding and subsequent workstations is not affected. In this embodiment, during measurement, the second drive mechanism 8 drives the first platform 3 to slide from the original position to the end position along the first horizontal direction at the same speed as the conveyor belt, and the second platform 4 is maintained at the air supply position; after measurement, that is, when the first platform 3 slides to the end position, the first drive mechanism 5 drives the second platform 4 to switch to the disconnected position, and at the same time, the second drive mechanism 8 drives the first platform 3 to move in the opposite direction to the original position, to correspond to the next group of first blood tubes 11 and second blood tubes 12, and at the original position, the first drive mechanism 5 drives the second platform 4 to slide to the air supply position again, ensuring that all first blood tubes 11 and second blood tubes 12 on the production line can be leak tested.

[0044] Specifically, in one implementation, see Figure 1-3, the second platform 4 and the first slide rail 31 are each provided with a plurality, and the plurality of second platforms 4 correspond to the plurality of first slide rails 31 one by one, the plurality of second platforms 4 are arranged at intervals along the first horizontal direction, and the plurality of first slide rails 31 are arranged at intervals along the first horizontal direction to correspond to the measurement of the plurality of first blood tubes 11 and the second blood tubes 12.

[0045] Specifically, in one implementation, see Figure 1 -3. There are multiple first sleeves 41 and multiple second sleeves 42. Multiple first sleeves 41 are arranged on the second platform 4 along the first horizontal direction at intervals, and multiple second sleeves 42 are arranged on the second platform 4 along the first horizontal direction at intervals, and one second sleeve 42 is arranged between two adjacent first sleeves 41.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0047] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for using a leak detection device on a blood tube production line, characterized in that: include: The leak detection device on the blood tube production line includes a first sensor for collecting a first air pressure value in the first blood tube, a second sensor for collecting a second air pressure value in the second blood tube, an air supply mechanism for supplying air to the first blood tube and the second blood tube respectively, a first platform provided with a first slide rail, a second platform slidably arranged on the first slide rail, and a first driving mechanism for driving the second platform to slide and switch between an air supply position and a disconnection position; The second platform is provided with a first sleeve and a second sleeve respectively connected to the air supply mechanism, the first sleeve and the second sleeve are spaced apart along a first horizontal direction, and the first slide rail extends along a second horizontal direction perpendicular to the first horizontal direction; When the second platform is in the disconnected position: a gap is formed between the first sleeve and the first blood tube, and a gap is formed between the second sleeve and the second blood tube; When the second platform is in the air supply position: the air supply mechanism is connected to the first blood tube through the first sleeve, and the air supply mechanism is connected to the second blood tube through the second sleeve; Also includes a controller; The controller is used to obtain a first air pressure value and a second air pressure value, and respectively calculate a first air pressure reduction amount of the first air pressure value within a predetermined time and a second air pressure reduction amount of the second air pressure value within a predetermined time; the controller is also used to calculate a difference between the first air pressure reduction amount and the second air pressure reduction amount according to the first air pressure reduction amount and the second air pressure reduction amount, and compare the difference with a preset value; Also included is an alarm communicatively connected to the controller; When the difference is greater than the preset value, the controller outputs an alarm signal to the alarm; Also includes a second slide rail and a second drive mechanism; The second slide rail extends along the first horizontal direction, the first platform is slidably disposed on the second slide rail, and the second driving mechanism drives the first platform to slide along the second slide rail; During measurement, the second driving mechanism drives the first platform to slide from the original position to the end position along the first horizontal direction at the same speed as the conveyor belt, and the second platform remains at the air supply position; after measurement, that is, when the first platform slides to the end position, the first driving mechanism drives the second platform to switch to the disconnected position, and at the same time, the second driving mechanism drives the first platform to move in the opposite direction to the original position to correspond to the next group of the first blood tubes and the second blood tubes, and at the original position, the first driving mechanism drives the second platform to slide to the air supply position again, ensuring that all the first blood tubes and the second blood tubes on the production line can be leak tested.

2. The method for using the leak detection device on the blood tube production line according to claim 1, characterized in that: A plurality of the first sensor and a plurality of the second sensor are provided.

3. The method for using the leak detection device on the blood tube production line according to claim 1, characterized in that: The leak detection device on the blood tube production line also includes a clamping mechanism for clamping the first blood tube and the second blood tube respectively.

4. The method for using the leak detection device on the blood tube production line according to claim 3, characterized in that: The clamping mechanism comprises: A first clamping block, the first clamping block is connected to the first platform, and the first clamping block is provided with a first upper clamp and a second upper clamp; a second clamping block, the second clamping block being connected to the first platform and spaced apart from the first clamping block in a vertical direction, the second clamping block being provided with a first lower clamping head and a second lower clamping head; and A driving member, wherein the driving member drives the first clamping block to slide and switch between a clamping position and a loose position along a predetermined direction; When the first clamping block is in the clamping position: the first upper clamp and the first lower clamp define a first clamping space for clamping a first blood tube, and the second upper clamp and the second lower clamp define a second clamping space for clamping a second blood tube.

5. The method for using the leak detection device on the blood tube production line according to claim 4, characterized in that: A plurality of the first clamping blocks and the second clamping blocks are respectively provided along the first horizontal direction.

6. The method for using the leak detection device on the blood tube production line according to claim 1, characterized in that: There are multiple second platforms and multiple first slide rails, and the multiple second platforms correspond to the multiple first slide rails one by one. The multiple second platforms are arranged at intervals along the first horizontal direction, and the multiple first slide rails are arranged at intervals along the first horizontal direction.

7. The method for using the leak detection device on the blood tube production line according to claim 1, characterized in that: There are multiple first sleeves and second sleeves, and the multiple first sleeves are arranged at intervals on the second platform along the first horizontal direction, and the multiple second sleeves are arranged at intervals on the second platform along the first horizontal direction, and one second sleeve is provided between two adjacent first sleeves.

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