Lead wire and medical equipment

Abstract

The utility model provides a lead wire and medical equipment, the lead wire is used for connecting an equipment main body, the lead wire comprises a plug, a cable and a shell, the plug comprises an interface part, and the cable is connected with the plug. The shell comprises a fixing part and a connecting part of the cable and the plug, part of the plug and part of the cable are fixedly arranged in the shell, the interface part extends out of the fixing part and is exposed out of the fixing part, and a lock catch groove is formed in the fixing part. The plug is fixedly connected with the equipment main body through the interface part for signal transmission, and the shell connects the plug and the cable together, so that the plug and the cable are protected. The shell is provided with the fixing part, the fixing part is provided with the lock catch groove, and the lock catch groove is matched with the equipment main body for clamping, so that the locking force between the lead wire and the equipment main body is enhanced, the lead wire is prevented from loosening, and the connection reliability of the lead wire is improved.

Description

Technical Field

[0001] The present application relates to the field of medical device accessories, and in particular to a lead wire. Background Art

[0002] In the medical industry, ECG lead wires commonly used to collect ECG signals include plugs, cables, junction boxes, and patient terminals. In actual use, the ECG lead wires connect the human body and the ECG recording instrument, and transmit the ECG signals collected from the human body to the instrument to achieve basic ECG collection functions. In the use scenario of dynamic ECG, the current common ECG lead wires need to be reliably connected to the instrument in order to ensure the stability of dynamic ECG signals.

[0003] In the prior art, there are the following patents that have been published: Publication No. CN201888817U, the ECG lead wire uses a standard HDMI interface, the main cable outlet direction is perpendicular to the plug-in and unplug direction of the interface, and the plug will not loosen or fall off due to cable pulling without setting a locking structure. However, the prior art can only eliminate the influence of pulling force along the direction of the main cable, and the locking effect of pulling force in other directions is insufficient, which can easily cause the cable plug to loosen. Therefore, it is necessary to design a lead wire with better locking effect for medical equipment. Utility Model Content

[0004] The purpose of the present application is to provide a lead wire, thereby overcoming the problem of insufficient locking effect of the lead wire.

[0005] In one aspect of the present application, a lead wire is provided for connecting a device body, the lead wire comprising a plug, a cable and a housing, the plug comprising an interface portion, the cable being connected to the plug. The housing comprises a fixing portion, the connection between the cable and the plug, part of the plug and part of the cable are fixedly arranged in the housing, the interface portion extends from the fixing portion and is exposed to the fixing portion, and a locking groove is provided on the fixing portion.

[0006] Furthermore, along the direction in which the plug is inserted into the device body, the fixing portion is further provided with a chamfer at the end facing the interface portion.

[0007] Furthermore, the lead wire also includes a sealing ring, which is arranged on the fixing portion and located on a side of the locking groove away from the interface portion.

[0008] Furthermore, the housing comprises an inner housing and a protective outer housing, the inner housing is a plastic housing, the inner housing wraps and connects the plug and the cable, the protective outer housing is fixed to the inner housing and at least partially covers the inner housing, and the fixing portion is arranged at a portion of the inner housing exposed to the protective outer housing.

[0009] Furthermore, the lead wire also includes a circuit board arranged in the housing, and the plug also includes pins, which are arranged at an end of the plug away from the interface part, and the cable and the pins are both connected to the circuit board.

[0010] Furthermore, a soldering pad is fixedly arranged on the circuit board, and the cable includes a conductor layer and a shielding layer. The plug also includes a connection tail end connected to the interface part, wherein the interface part and the connection tail end both include a metal shell, and the pin is arranged in the metal shell. The shielding layer and the metal shell are both welded to the soldering pad.

[0011] The present application also provides a medical device, the medical device comprising a socket, a device body and a lead wire connected to the socket, the socket is arranged in the device body, and the lead wire can be plugged in and out of the socket. The lead wire is the lead wire mentioned above.

[0012] Further, the socket comprises a socket body and a locking member movably arranged on the socket body. The socket body is provided with an interface, and the interface part can be plugged into the interface. The locking member can be operatively moved to lock with or disengage from the locking groove, and the locking member is snap-connected with the locking groove when the interface part is inserted into the interface.

[0013] Furthermore, an elastic buckle is protruding from the interior of the interface, and the elastic buckle elastically presses against the metal shell of the interface part.

[0014] Furthermore, the socket further comprises a socket groove, the socket groove is a step groove, and comprises a step surface. The housing further comprises a protective shell, the protective shell is arranged outside the fixing portion, and the protective shell and the fixing portion form a step shape, and the end of the protective shell is supported on the step surface.

[0015] Furthermore, the socket slot includes a first slot section and a second slot section that are interconnected, the first slot section and the second slot section form the step surface, wherein the fixing portion is accommodated in the second slot section, and a slope is arranged around the second slot section, and along the direction in which the plug is inserted into the device body, the slope is in the shape of a trumpet that contracts inwardly.

[0016] Furthermore, the angle formed by the inclined surface and the plane of the socket slot ranges from 90 degrees to 135 degrees.

[0017] A lead wire of the present application has the following beneficial effects: the lead wire provided by the present application is used to connect the device body, the lead wire includes a plug, a cable and a shell, the plug includes an interface part, and the cable is connected to the plug. The shell includes a fixed part, the connection between the cable and the plug, part of the plug and part of the cable are fixedly arranged in the shell, the interface part extends from the fixed part and is exposed to the fixed part, and a locking groove is provided on the fixed part. The plug is fixedly connected to the device body through the interface part for signal transmission, and the shell connects the plug and the cable together, which protects the plug and the cable. A fixed part is provided on the shell, and a locking groove is provided on the fixed part. The locking groove cooperates with the device body for clamping, thereby enhancing the locking force between the lead wire and the device body, preventing the lead wire from loosening, and improving the connection reliability of the lead wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present utility model, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the installation structure of a medical device of the present application in a use state, including a device body, a lead wire and a socket;

[0020] Figure 2 yes Figure 1 A schematic diagram of the structure of the lead wire described in the figure, including a plug and a circuit board;

[0021] Figure 3 yes Figure 1 A schematic diagram of the structure of the medical device from a top view;

[0022] Figure 4 yes Figure 1 A schematic diagram of the side view structure of the lead wire in a released state;

[0023] Figure 5 yes Figure 1 A side view structural diagram of the lead wire in a locked state;

[0024] Figure 6 yes Figure 1 A side view and a partially enlarged structural schematic diagram of the lead wire in a locked state;

[0025] Figure 7 yes Figure 2 A schematic diagram of a top view of the plug and the circuit board;

[0026] Figure 8 yes Figure 2A schematic diagram of the structure of the plug and the circuit board;

[0027] Fig. 9 yes Figure 1 A schematic diagram of the structure of the socket described in;

[0028] Fig.10 It is a structural schematic diagram of the socket and the plug in a mating state.

[0029] Description of reference numerals:

[0030] 1. Equipment body; 2. Lead wire; 3. Socket;

[0031] 11. Locking member; 12. Elastic member; 21. Plug; 22. Cable; 23. Shell; 31. Socket body; 32. Socket slot;

[0032] 211, interface part; 212, circuit board; 213, pin; 214, connection end; 215, metal shell; 231, fixing part; 232, sealing ring; 233, inner shell; 234, protective shell; 311, interface; 321, step surface; 322, first section groove; 323, second section groove;

[0033] 2121, soldering pad; 2311, locking groove; 2312, chamfer; 3111, elastic buckle; 3112, isolation sheet; 3231, inclined surface. DETAILED DESCRIPTION

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0035] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0037] It should be noted that the "multiple" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0038] See also Figures 1 to 6 As shown, one aspect of the present application provides a lead wire 2 for connecting a device body 1. The lead wire 2 includes a plug 21, a cable 22 and a housing 23. The plug 21 includes an interface portion 211, and the cable 22 is connected to the plug 21. The housing 23 includes a fixing portion 231, and the connection between the cable 22 and the plug 21, part of the plug 21 and part of the cable 22 are fixedly arranged in the housing 23. The interface portion 211 extends from the fixing portion 231 and is exposed to the fixing portion 231. The fixing portion 231 is provided with a locking groove 2311. The plug 21 is fixedly connected to the device body 1 through the interface portion 211 for signal transmission. The housing 23 connects the plug 21 and the cable 22 together, and protects the plug 21 and the cable 22. The housing 23 is provided with a fixing portion 231 , and the fixing portion 231 is provided with a locking groove 2311 , which cooperates with the device body 1 for clamping, thereby enhancing the locking force between the lead wire 2 and the device body 1 , preventing the lead wire 2 from loosening, and improving the connection reliability of the lead wire 2 .

[0039] Specifically, refer to Figure 4 and Figure 5 Along the direction of the plug 21 being inserted into the device body 1, the fixing portion 231 is further provided with a chamfer 2312 at the end facing the interface portion 211. Since the fixing portion 231 is provided with a chamfer 2312 in the direction of the interface portion 211, such a configuration can guide the plug 21, facilitate the insertion of the lead wire 2, and the plug 21 can be connected more tightly to the device body 1, and the plug and unplug are convenient and quick, and are not easy to fall off.

[0040] Preferably, in some embodiments, see Figures 2 to 6The lead wire 2 also includes a sealing ring 232, which is arranged on the fixing portion 231 and is located on the side of the locking groove 2311 away from the interface portion 211. Optionally, the sealing ring 232 can be made of rubber material and has good elasticity. The sealing ring 232 can be an integral structure with the fixing portion 231 or be detachably arranged on the fixing portion 231. When the sealing ring 232 is a separate part, the cross section is O-shaped. When the lead wire 2 is inserted into the device body 1, the sealing ring 232 and the device body 1 are interference fit, which enhances the sealing between the lead wire 2 and the device body 1, can play a role of waterproofing and buffering, and improve safety performance.

[0041] Please continue reading Figure 2 The housing 23 includes an inner housing 233 and a protective outer housing 234. The inner housing 233 is a plastic housing, and the inner housing 233 wraps the connecting plug 21 and the cable 22. The protective outer housing 234 is fixed on the inner housing 233 and at least partially covers the inner housing 233. The fixing portion 231 is arranged at the part of the inner housing 233 exposed to the protective outer housing 234. The inner housing 233 is a plastic structure, which wraps and fixes the cable 22 and the plug 21, has a certain flexibility, can better adapt to the bending of the lead wire 2, avoid the problems of the lead wire 2 breaking and falling off caused by the bending, and increase the durability and safety of the lead wire 2. Further, the protective outer housing 234 is fixed on the outside of the inner housing 233, and can be an integral structure with the inner housing 233 or be detachably installed. The detachable installation of the protective outer housing 234 can be conveniently replaced when the protective outer housing 234 is severely worn, saving costs. Specifically, the protective outer housing 234 can use a material with a certain elasticity and wear resistance to fix and protect the cable 22 and the plug 21. At the same time, the protective shell 234 isolates the lead wire 2 from the human body, which can effectively isolate the static electricity from the human body and prevent signal interference from affecting the accuracy of the ECG signal.

[0042] In some embodiments, see Figures 7 to 10 The lead wire 2 further includes a circuit board 212 disposed in the housing 23, and the plug 21 further includes a pin 213, which is disposed at an end of the plug 21 away from the interface portion 211, and the cable 22 and the pin 213 are both connected to the circuit board 212. All the pins 213 on the lead wire 2 are welded to the circuit board 212, and the ECG signal is identified and transmitted through the pins 213.

[0043] Specifically, a soldering pad 2121 is fixedly provided on the circuit board 212, and the cable 22 includes a shielding layer. The plug 21 also includes a connection tail end 214 connected to the interface part 211, wherein the interface part 211 and the connection tail end 214 both include a metal shell 215, and the pin 213 is arranged in the metal shell 215. The shielding layer and the metal shell 215 are both welded to the soldering pad 2121. The circuit board 212, the pin 213 and the soldering pad 2121 are all accommodated in the metal shell 215, and are connected together through the shielding layer of the lead wire 2, the metal shell 215 and the grounding of the instrument. During use, even if the external interference signal is transmitted to the exposed metal shell 215, it will be transmitted to the grounding loop through the above route, and will not be coupled with the ECG signal transmitted on the conductor layer of the cable 22 or the pin 213, thereby realizing the filtering of the external signal by the metal shell 215 of the plug 21, ensuring the accuracy of the collection of the ECG signal, preventing signal interference, and improving the anti-interference effect of the lead wire 2. Alternatively, the circuit board 212 may not be provided with the soldering pad 2121, and the shielding layer may be directly welded together with the pin 213 and the metal shell 215, which can also play the role of shielding interference signals and improve the accuracy of the ECG signal.

[0044] The present application also provides a medical device, which includes a socket 3, a device body 1 and a lead wire 2 connected to the socket 3. The socket 3 is arranged in the device body 1, and the lead wire 2 is pluggable and connected to the socket 3.

[0045] In some specific embodiments, please refer to Figure 3 and Figure 6The socket 3 includes a socket body 31 and a locking member 11 movably arranged on the socket body 31. The socket body 31 is provided with an interface 311, and the interface portion 211 can be plugged into the interface 311. The locking member 11 can be operably moved to lock with or disengage from the locking groove 2311, and the locking member 11 is snap-connected with the locking groove 2311 when the interface portion 211 is inserted into the interface 311. The lead wire 2 is pluggable and connected to the device body 1 through the cooperation of the interface portion 211 and the interface 311. Specifically, the direction of the cable 22 of the lead wire 2 is perpendicular to the plug-in and unplugging direction of the plug 21. When the lead wire 2 is pulled along the direction of the cable 22, the lead wire 2 and the device body 1 stop each other, so that the lead wire 2 is not easy to loosen. Furthermore, a locking member 11 is provided on the socket body 31, and the locking member 11 is engaged with the locking groove 2311 on the lead wire 2 to lock the lead wire 2. The engagement between the locking member 11 and the locking groove 2311 is safe and reliable, which effectively enhances the locking force between the lead wire 2 and the device body 1 and improves the locking effect. The locking member 11 can also be fixedly installed in the device body 1 by the elastic member 12, and the locking member 11 can be movably locked or disengaged with the locking groove 2311 by pressing the locking member 11, thereby locking or releasing the lead wire 2. After the lead wire 2 is inserted or pulled out, the locking member 11 can reset itself under the elastic force of the elastic member 12 to ensure that the locking member 11 is in a locked state.

[0046] For details, please refer to Figure 6 , the socket 3 also includes a socket slot 32, which is a step slot and includes a step surface 321. The housing 23 also includes a protective shell 234, which is arranged outside the fixing portion 231, and the protective shell 234 and the fixing portion 231 form a step shape, and the end of the protective shell 234 is supported on the step surface 321. The setting of the socket slot 32 can play a guiding role for the lead wire 2, preventing the plug 21 from being inserted into the wrong socket 3. The socket slot 32 includes a step surface 321. When the plug 21 of the lead wire 2 is inserted into the socket 3, the protective shell 234 abuts against the step surface 321, which plays a role of sealing and protection, preventing the plug 21 from directly abutting against the device body 1 and being damaged, thereby improving the service life of the product.

[0047] In some specific embodiments, reference Figure 6The socket slot 32 includes a first slot 322 and a second slot 323 that are interconnected. The first slot 322 and the second slot 323 form a step surface 321, wherein the fixing portion 231 is accommodated in the second slot 323. A slope 3231 is arranged around the second slot 323. Along the direction in which the plug 21 is inserted into the device body 1, the slope 3231 is in the shape of a trumpet that contracts inwards. The locking member 11 and the locking slot 2311 are both made of hard materials. When the plug 21 is inserted, there is a gap. Therefore, a groove (not shown) is arranged on the fixing portion 231. A sealing ring 232 is arranged in the groove. The sealing ring 232 is interference-fitted with the socket slot 32. The sealing ring 232 abuts against the inner wall of the second slot section, further playing a role in sealing and waterproofing. It can also buffer the plug 21 to prevent the plug 21 from being worn out due to excessive force when inserted.

[0048] In some embodiments, the angle formed by the inclined surface 3231 and the plane of the socket slot 32 ranges from 90 degrees to 135 degrees. The angle formed by the inclined surface 3231 and the plane of the socket slot 32 can be 100 degrees, 120 degrees, or 130 degrees. Since there is a certain angle A between the inclined surface 3231 and the plane of the socket slot 32, when A is equal to 90 degrees, the direction of the elastic force generated by the extrusion of the sealing ring 232 is perpendicular to the plugging and unplugging direction of the plug 21. At this time, in the unplugging direction of the plug 21, the friction between the plug 21 and the socket slot 32 is relatively large, and it is not easy to loosen, which plays a locking role; and when A is greater than 90 degrees and less than or equal to 180 degrees, the direction of the elastic force will have a certain component force in the unplugging direction of the plug 21. This component force prompts the plug 21 to move outward, driving the locking groove 2311 moves outward, thereby eliminating the gap between the locking groove 2311 and the locking piece 11, and the sealing ring 232 and the inclined surface 3231 still maintain an interference state. Finally, the locking groove 2311 and the locking piece 11 are tightly matched, and the sealing ring 232 always provides a pre-tightening force, which can ensure that the lead wire 2 is completely fitted with the socket groove 32, and there will be no loosening of the plug 21, thereby preventing the lead wire 2 from loosening, and further avoiding the formation of interference signals due to friction between the plug 21 and the socket 3, thereby ensuring the accuracy of the ECG signal.

[0049] Preferably, please refer to Fig. 9 and Fig.10, an elastic buckle 3111 is convexly provided inside the interface 311, and the elastic buckle 3111 elastically presses against the metal shell 215 of the interface part 211. At least four elastic buckles 3111 are provided, and the elastic buckles 3111 press against the metal shell 215 of the interface part 211. When the lead wire 2 is subjected to pulling forces in different directions, the elastic buckle 3111 and the plug 21 generate static friction to prevent the plug 21 from loosening. An isolation sheet 3112 is also provided between the inside of the interface 311 and the plug 21. Due to the cooperation between the locking member 11 and the locking groove 2311, the lead wire 2 is well locked in the device body 1, and almost no displacement occurs. Therefore, the isolation sheet 3112 is not prone to plating wear problems, which increases the service life of the lead wire 2.

[0050] Specifically, the method for making the lead wire 2 can refer to the following steps:

[0051] Step 1: solder the circuit board 212, the pins 213 of the plug 21, and the conductor layer of the cable 23 into one body, wherein the solder pad 2121, the shielding layer, and the connection tail 214 are soldered together;

[0052] Step 2: Form a plastic structure around the soldered circuit board 212 to form an inner housing 233 that completely wraps the circuit board 212;

[0053] Step 3: Continue molding around the inner shell 233 to form a protective outer shell 234. The plastic structure exposed from the protective outer shell 234 is the fixing portion 231, which can be locked with the locking member 11;

[0054] Step 4: assemble the sealing ring 232 on the fixing portion 231 to finally form the lead wire 2.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "disposed (provided with)", "connected" 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.

[0056] In the description of this specification, the description of reference terms such as "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the utility model. 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention. Therefore, any changes or modifications made according to the claims and description of the present invention should fall within the scope of the present invention.

Claims

1. A lead wire, used to connect a device body, characterized in that: include: A plug, the plug comprising an interface portion; a cable connected to the plug; The shell comprises a fixing portion, a connection between the cable and the plug, a part of the plug and a part of the cable are fixedly arranged in the shell, the interface portion extends from the fixing portion and is exposed outside the fixing portion, and a locking groove is provided on the fixing portion.

2. The lead wire according to claim 1, characterized in that: Along the direction in which the plug is inserted into the device body, the fixing portion is further provided with a chamfer at the end facing the interface portion.

3. The lead wire according to claim 1, characterized in that: The lead wire further comprises a sealing ring, which is arranged on the fixing portion and located at a side of the locking groove away from the interface portion.

4. The lead wire according to any one of claims 1 to 3, characterized in that: The housing comprises an inner housing and a protective outer housing, wherein the inner housing is a plastic housing, and the inner housing wraps and connects the plug and the cable; The protective outer shell is fixed on the inner shell and at least partially covers the inner shell, and the fixing portion is arranged at a portion of the inner shell exposed from the protective outer shell.

5. The lead wire according to any one of claims 1 to 3, characterized in that: The lead wire further includes a circuit board arranged in the housing, and the plug further includes a pin, which is arranged at an end of the plug away from the interface portion, and the cable and the pin are both connected to the circuit board.

6. The lead wire according to claim 5, characterized in that: The circuit board is provided with a soldering pad, and the cable comprises a conductor layer and a shielding layer; The plug further comprises a connection tail end connected to the interface portion, wherein both the interface portion and the connection tail end comprise a metal shell, and the pin is disposed in the metal shell; The shielding layer and the metal shell are both welded to the welding pad.

7. A medical device, characterized in that: The medical device comprises a socket, a device body and a lead wire connected to the socket, wherein the socket is arranged in the device body, and the lead wire is pluggable and connected to the socket; wherein the lead wire is the lead wire as described in any one of claims 1-6 above.

8. The medical device according to claim 7, characterized in that The socket comprises a socket body and a locking member movably arranged on the socket body; The socket body is provided with an interface, and the interface portion can be plugged into the interface; The locking member can be operatively moved to be locked with or disengaged from the locking groove, and the locking member is snap-connected with the locking groove when the interface portion is inserted into the interface.

9. The medical device according to claim 7, characterized in that An elastic buckle is protruding inside the interface, and the elastic buckle elastically presses against the metal shell of the interface part.

10. The medical device according to claim 9, characterized in that The socket further comprises a socket slot, wherein the socket slot is a step slot and comprises a step surface; The housing further includes a protective shell, which is disposed outside the fixing portion, and the protective shell and the fixing portion form a step shape, and an end of the protective shell is supported on the step surface.

11. The medical device according to claim 10, characterized in that The socket slot includes a first slot section and a second slot section that are interconnected, wherein the first slot section and the second slot section form the step surface, wherein the fixing portion is accommodated in the second slot section, and an inclined surface is arranged around the second slot section, and along the direction in which the plug is inserted into the device body, the inclined surface is in the shape of a trumpet that contracts inwardly.

12. The medical device according to claim 11, characterized in that The angle formed by the inclined surface and the plane of the socket slot ranges from 90 degrees to 135 degrees.

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