阅读说明：本技术 一种使用方便的胸外科手术用拉钩装置 (Convenient to use's drag hook device for thoracic surgery ) 是由 罗向晖 于 2021-09-14 设计创作，主要内容包括：本发明涉及拉钩装置技术领域,具体为一种使用方便的胸外科手术用拉钩装置,包括装置主体,所述装置主体包括主撑套,所述主撑套的两面皆连接有主撑架；防尘套,背面所述主撑架和主撑套的一侧连接有防尘套,所述防尘套一侧的主撑套上连接有控制面板。本发明通过设置有伺服电机、丝杆、传动皮带、拉杆和拉钩块,这样利用伺服电机作为主动力来源,利用拉杆的运动来带动拉钩块将患者的切口处撑开,这样无需使用人工进行长时间拉扯,防止出现切口的露出口时大时小,且在拉开的过程中更加稳定,避免造成对患者进行过度拉伸的情况,不仅可以使得医护人员不会受到露出口大小变化的影响,同时可以使得实习生自己专心地进行观摩学习。(The invention relates to the technical field of a draw hook device, in particular to a draw hook device for thoracic surgery, which is convenient to use and comprises a device main body, wherein the device main body comprises a main supporting sleeve, and two surfaces of the main supporting sleeve are both connected with a main supporting frame; the back of the dustproof sleeve is connected with the dustproof sleeve on one side of the main support frame and one side of the main support sleeve, and the control panel is connected on the main support sleeve on one side of the dustproof sleeve. The invention is provided with the servo motor, the screw rod, the transmission belt, the pull rod and the pull hook block, so that the servo motor is used as a main power source, the pull hook block is driven by the movement of the pull rod to prop open the incision of a patient, the long-time pulling is not needed, the size of the incision when the incision is exposed is prevented, the incision is more stable in the pulling process, the condition of over-stretching of the patient is avoided, medical personnel can not be influenced by the size change of the exposure, and meanwhile, the practice students can be dedicated to study.)

1. A convenient to use's thoracic surgery uses the drag hook device, characterized by, includes:

the device comprises a device main body (1), wherein the device main body (1) comprises a main supporting sleeve (110), and two surfaces of the main supporting sleeve (110) are both connected with a main supporting frame (111);

the back of the dustproof sleeve (112), one side of the main support frame (111) and one side of the main support frame (110) are connected with the dustproof sleeve (112), the main support frame (110) on one side of the dustproof sleeve (112) is connected with a control panel (113), the back of the dustproof sleeve (112) is internally provided with a transmission groove (115), the inner wall of the transmission groove (115) is movably connected with a transmission rod (116), the inner surface of the dustproof sleeve (112) is connected with a servo motor (114), the output end of the servo motor (114) is sleeved with a transmission belt (117), and the other side of the transmission belt (117) is connected to the transmission rod (116);

lead screw (118), lead screw (118) swing joint is on positive main strut (111), lead screw (118) are located inside main strut cover (110), and the one side and transfer line (116) of lead screw (118) are connected, screw block (119) have been cup jointed on lead screw (118), and the quantity of screw block (119) is two, two one side of screw block (119) all is connected with pull rod (120), two all the activity has cup jointed two draw hook blocks (121) on pull rod (120).

2. A thoracic surgical retractor apparatus according to claim 1 wherein: two the both ends of screw thread piece (119) all are connected with lubricated board (122), four lubricated groove (123) have all evenly been seted up on lubricated board (122), it has lubricated wheel (124) to cup joint through the pivot on the inner wall of lubricated groove (123), and the internal surface of the one end of moist wheel (124) and main cover (110) of propping closely laminates.

3. A thoracic surgical retractor apparatus according to claim 2 wherein: two pull rod (120) one side is equipped with assists brace sleeve (125), and two pull rod (120) all insert in assisting brace sleeve (125), assist the both sides of bracing sleeve (125) and all be connected with and assist brace rod (126).

4. A thoracic surgical retractor apparatus according to claim 3 wherein: and the two pull rods (120) in the auxiliary supporting sleeve (125) are sleeved with stabilizing wheels (127) through bearings, the outer sides of the stabilizing wheels (127) are tightly attached to the inner surfaces of the auxiliary supporting sleeve (125), and the inner sides of the auxiliary supporting rods (126) and the two main supporting frames (111) are provided with adjusting mechanisms (2).

5. The retractor device for thoracic surgery of claim 4, wherein: adjustment mechanism (2) are including adjusting pole (210), and the quantity of adjusting pole (210) is two, two the both sides of adjusting pole (210) are connected respectively on assisting vaulting pole (126) and main support frame (111), two it has pushed ring (211) to go up movable sleeve joint in adjusting pole (210), and pushes the quantity of ring (211) and be two, two it is located the outside of four hook blocks (121) to push ring (211), two adjust pole (210) and all seted up regulation groove (212), two it all installs thread bush (213), four all to imbed in the two sides of pushing ring (211) it has threaded rod (214) all to have movably sleeve joint in thread bush (213), two the one end of pushing ring (211) all is equipped with block mechanism (3).

6. A thoracic surgical retractor device in accordance with claim 5 wherein: clamping mechanism (3) are including a top board (310), the one end of top board (310) is connected on propelling ring (211), bottom board (312) is equipped with to the one end of top board (310), one side of bottom board (312) is connected with block pinion rack (313), the two sides of bottom board (312) all are connected with connecting strip (311) through the pivot, and connecting strip (311) are located the one side of hook piece (121).

7. The retractor device for thoracic surgery of claim 6 further comprising: the other end of the two connecting strips (311) is connected with a strong magnetic sheet (315) through a rotating shaft, the two hook blocks (121) on one side of the strong magnetic sheets (315) are provided with an adsorption groove (314), the strong magnetic sheets (315) are inserted into the adsorption groove (314), the inner walls of the two adsorption grooves (314) are embedded with iron sheets, a clamping strip (316) is fixedly arranged on the bottom plate (312), one end of the clamping strip (316) extends through the top plate (310), a clamping sleeve (317) is fixedly arranged on the top plate (310) on one side of the clamping strip (316), clamping grooves (318) are uniformly formed in the clamping strip (316), clamping sheets (319) are inserted into the clamping sleeve (317), one side of each clamping sheet (319) is arc-shaped, one side of each clamping sheet (319) is connected with an extrusion spring (320), and the number of the extrusion springs (320) is two, the other sides of the two extrusion springs (320) are connected to the inner surface of the clamping sleeve (317).

8. The retractor device for thoracic surgery of claim 7 wherein: the clamping sleeve (317) is provided with a touch block (322), a touch groove (321) is inserted into the touch block (322), and one end of the touch groove (321) is connected to the clamping piece (319).

Technical Field

The invention relates to the technical field of a draw hook device, in particular to a draw hook device for thoracic surgery, which is convenient to use.

Background

Thoracic surgery is a medical special department, which is specialized in the diagnosis and treatment of thoracic cavity organs, mainly esophagus, lung and mediastinum lesions, and the field of breast surgery is also included in the special department, mainly lung surgery and esophagus surgery, modern thoracic surgeons do not need to search the relationship between a certain disease and surgical treatment as hard as pioneers, and a lot of successful or failed empirical lessons are left for us, and the fundamental theory of thoracic surgery is formed by summarizing the empirical lessons.

In the prior thoracic surgery, after medical personnel incise skin muscles, the skin muscles need to be respectively pulled towards two sides by using a draw hook, so that the middle operation visual field is exposed, the trainees generally see and rub on the spot in the prior operation, the work content is often formed by continuously pulling the draw hook, in the actual operation, because the muscle of the patient is continuously contracted, the personnel is required to spend more strength when pulling the draw hook, meanwhile, the strength of the trainees of the draw hook is gradually reduced along with the increase of time, so that the operation visual field is easy to be large or small, the operation progress of a main knife patient is influenced, and fixing rings and the draw hook are used for matching in some operations, so that the periphery of the draw hook is stressed and fixed, but the drawing range of the draw hook in the mode has certain limitation when in use, and the condition that the two ends of the cut opening of the patient are slightly torn easily caused by fixing and pulling the muscle for a long time, the medical staff is not convenient to sew up, the working difficulty of the medical staff is increased, and therefore the retractor device for the thoracic surgery operation, which is convenient to use, needs to be designed.

Disclosure of Invention

The invention aims to provide a retractor device for thoracic surgery, which is convenient to use and aims to solve the problems that a person who is provided in the background art spends a large amount of force when pulling the retractor, and meanwhile, the force of a retractor trainee is gradually reduced along with the increase of time, so that the field of vision of an operation is large and small, the operation process of a main knife patient is influenced, and the two ends of a cut opening of the patient are easily slightly torn due to the fact that a fixing ring and the retractor are matched to fix and pull muscles for a long time, the follow-up medical staff is inconvenient to suture, and the working difficulty of follow-up medical staff is increased.

In order to achieve the purpose, the invention provides the following technical scheme: a thoracic surgery retractor device which is convenient to use comprises:

the device comprises a device main body, a supporting device and a supporting device, wherein the device main body comprises a main supporting sleeve, and two surfaces of the main supporting sleeve are both connected with a main supporting frame;

the dustproof cover is connected to one side of the main support frame and one side of the main support frame on the back side, a control panel is connected to the main support frame on one side of the dustproof cover, a transmission groove is formed in the main support frame on the back side, a transmission rod is movably connected to the inner wall of the transmission groove, a servo motor is connected to the inner surface of the dustproof cover, a transmission belt is sleeved at the output end of the servo motor, and the other side of the transmission belt is connected to the transmission rod;

the lead screw, lead screw swing joint is on positive main support frame, the lead screw is located inside the main cover that props, and the one side and the transfer line of lead screw are connected, the screw rod has cup jointed the screw block, and the quantity of screw block is two, two one side of screw block all is connected with the pull rod, two all the activity has cup jointed two hook blocks on the pull rod.

Preferably, two the both ends of screw thread piece all are connected with lubricated board, four all evenly seted up the lubrication groove on the lubricated board, it has lubricated pulley to cup joint through the pivot on the inner wall in lubrication groove, and the internal surface of one end and the main brace of moist pulley closely laminates.

Preferably, two pull rod one side is equipped with assists the brace cover, and two pull rods all insert in assisting the brace cover, assist the both sides of brace cover and all be connected with the assistance vaulting pole.

Preferably, the two pull rods in the auxiliary supporting sleeve are sleeved with stabilizing wheels through bearings, the outer sides of the stabilizing wheels are tightly attached to the inner surfaces of the auxiliary supporting sleeve, and the inner sides of the auxiliary supporting rods and the two main supporting frames are provided with adjusting mechanisms.

Preferably, adjustment mechanism is including adjusting the pole, and the quantity of adjusting the pole is two, two the both sides of adjusting the pole are connected respectively on assisting vaulting pole and main-stay frame, two the regulation pole is gone up the activity and has been cup jointed the promotion ring, and the quantity that promotes the ring is two the promotion ring is located the outside of four hook blocks, two the adjustment tank has all been seted up on the regulation pole, two the thread bush, four are all installed in the embedding in the both sides of promotion ring all the activity has cup jointed the threaded rod in the thread bush, two the one end of pushing the ring all is equipped with block mechanism.

Preferably, the clamping mechanism comprises a top plate, one end of the top plate is connected to the pushing ring, a bottom plate is arranged at one end of the top plate, a clamping toothed plate is connected to one side of the bottom plate, two sides of the bottom plate are connected with connecting strips through rotating shafts, and the connecting strips are located on one side of the hook block.

Preferably, two the other end of connecting strip all is connected with strong magnetic sheet, two through the pivot all seted up the adsorption tank on the hook piece of strong magnetic sheet one side, and strong magnetic sheet inserts in the adsorption tank, two all the embedding is installed the iron sheet on the inner wall of adsorption tank, fixed mounting has the screens strip on the bottom plate, and the one end of screens strip extends the top plate, fixed mounting has the screens cover on the top plate of screens strip one side, the screens groove has evenly been seted up on the screens strip, the card piece has been inserted in the screens cover, and one side of card piece is the arc, one side of card piece is connected with the extrusion spring, and the quantity of extrusion spring is two, two the opposite side of extrusion spring all connects on the internal surface of screens cover.

Preferably, the clamping sleeve is provided with a touch block, a touch groove is inserted into the touch block, and one end of the touch groove is connected to the clamping sheet.

Compared with the prior art, the invention has the beneficial effects that:

1. by arranging the servo motor, the screw rod, the transmission belt, the pull rod and the pull hook block, the servo motor is used as a main power source, the pull hook block is driven to prop open the incision of a patient by the movement of the pull rod, so that the long-time pulling is not needed, the incision exposure port is prevented from being large and small, the pull rod is more stable in the pulling process, the excessive stretching of the patient is avoided, medical workers can not be influenced by the change of the exposure port, meanwhile, the trainees can be consciously studied by themselves, meanwhile, the electric stretching has a certain adjusting function, the electric stretching device can be suitable for more incision types, is simpler and more convenient to operate, reduces the operation difficulty of the medical workers, and can quickly adjust the exposure port according to the condition of the patient in the operation relative to a fixed ring stretching mode, the device is more humanized.

2. Through being provided with the regulation pole, push ring, adjustment tank, thread bush and threaded rod, utilize the extrusion of threaded rod to the adjustment tank like this, make the push ring can fix specific position on adjusting the pole, thereby make the promotion ring after fixing can block the hook piece stroke, avoid the hook piece to produce outside removal at the during operation, prevent to cause the position change of hook piece and carry out the overstretching to patient's wound, make the protection effect of this device better, the nature controlled has more.

3. Through being provided with connecting strip, top position board and end position board, utilize the removal of draw hook piece like this for top position board and end position board rise gradually, thereby carry out the centre gripping to the musculature at patient's incision both ends, prevent at the tensile operation in-process of longer time, cause the musculature at patient's incision both ends to take place the torn condition, reduced patient's postoperative misery, also make medical personnel more convenient when follow-up sewing up simultaneously.

Drawings

FIG. 1 is a schematic top perspective view of the structure of the present invention;

FIG. 2 is a schematic bottom perspective view of the present invention;

FIG. 3 is an exploded perspective view of the main brace structure of the present invention;

FIG. 4 is a schematic sectional perspective view of a dust boot according to the present invention;

FIG. 5 is an exploded perspective view of the thread block structure of the present invention;

FIG. 6 is a perspective view of the pull rod of the present invention;

FIG. 7 is a schematic sectional perspective view of an auxiliary brace structure of the present invention;

FIG. 8 is a schematic perspective view of a portion of a cross-section of an adjustment lever structure according to the present invention;

FIG. 9 is a perspective view of the engaging mechanism of the present invention;

fig. 10 is a schematic sectional perspective view of the detent sleeve structure of the present invention.

In the figure: 1. a device main body; 110. a main supporting sleeve; 111. a main support frame; 112. a dust-proof sleeve; 113. a control panel; 114. a servo motor; 115. a transmission groove; 116. a transmission rod; 117. a drive belt; 118. a screw rod; 119. a thread block; 120. a pull rod; 121. a hook block is pulled; 122. a lubrication plate; 123. a lubrication groove; 124. lubricating the wheel; 125. auxiliary supporting sleeves; 126. an auxiliary stay bar; 127. a stabilizing wheel; 2. an adjustment mechanism; 210. adjusting a rod; 211. a push ring; 212. an adjustment groove; 213. a threaded sleeve; 214. a threaded rod; 3. a clamping mechanism; 310. a top plate; 311. a connecting strip; 312. a bottom plate; 313. clamping a toothed plate; 314. an adsorption tank; 315. a strong magnetic sheet; 316. a clamping strip; 317. a clamping sleeve; 318. a clamping groove; 319. a clamping sheet; 320. a compression spring; 321. a touch groove; 322. and a touch block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-10, an embodiment of the present invention is shown:

a thoracic surgery retractor device which is convenient to use comprises:

the device comprises a device body 1, wherein the device body 1 comprises a main supporting sleeve 110, and two sides of the main supporting sleeve 110 are both connected with a main supporting frame 111;

the dustproof cover 112 is connected to one side of the back main support frame 111 and one side of the main support frame 110, the control panel 113 is connected to the main support frame 110 on one side of the dustproof cover 112, a transmission groove 115 is formed in the back main support frame 111, a transmission rod 116 is movably connected to the inner wall of the transmission groove 115, a servo motor 114 is connected to the inner surface of the dustproof cover 112, a transmission belt 117 is sleeved at the output end of the servo motor 114, and the other side of the transmission belt 117 is connected to the transmission rod 116;

the lead screw 118 is movably connected to the front main support frame 111, the lead screw 118 is positioned inside the main support sleeve 110, one surface of the lead screw 118 is connected with the transmission rod 116, the lead screw 118 is sleeved with two thread blocks 119, one sides of the two thread blocks 119 are connected with the pull rod 120, the two pull rods 120 are movably sleeved with two pull hook blocks 121, so that the servo motor 114 is used as a main power source, the pull hook blocks 121 are driven by the movement of the pull rod 120 to prop open the incision of a patient, long-time pulling is not needed, the size of the incision is prevented from being large and small when the incision is exposed, the pulling process is more stable, the situation that the patient is excessively stretched is avoided, medical staff cannot be influenced by the size change of the exposure, and meanwhile, trainees can learn by themselves carefully, simultaneously, the electric stretching has a certain adjusting function, can be suitable for more incision types, is simpler and more convenient to operate, reduces the operation difficulty of medical workers, and simultaneously, compared with a fixing ring stretching mode, the device can quickly adjust the size of an exposure port according to the condition of a patient in an operation, so that the device is more humanized.

Furthermore, both ends of two screw blocks 119 all are connected with lubricating plate 122, have all evenly seted up lubricating groove 123 on four lubricating plate 122, have cup jointed lubricating wheel 124 through the pivot on lubricating groove 123's the inner wall, and the one end of lubricating wheel 124 closely laminates with the internal surface of main brace 110, utilizes lubricating wheel 124's lubrication and supporting effect like this for screw block 119 is difficult to take place the shake when the motion more.

Further, two pull rods 120 are provided with one side of the auxiliary supporting sleeve 125, and the two pull rods 120 are inserted into the auxiliary supporting sleeve 125, and the two sides of the auxiliary supporting sleeve 125 are connected with the auxiliary supporting rod 126, so that the auxiliary supporting effect of the auxiliary supporting sleeve 125 is utilized, and the pull rods 120 are not inclined or shaken more easily in the moving process.

Further, the two pull rods 120 inside the auxiliary supporting sleeve 125 are sleeved with the stabilizing wheels 127 through bearings, the outer sides of the stabilizing wheels 127 are tightly attached to the inner surfaces of the auxiliary supporting sleeve 125, the two auxiliary supporting rods 126 and the two main supporting frames 111 are provided with the adjusting mechanisms 2, so that the lubricating and supporting effects of the stabilizing wheels 127 are utilized, the stability of the pull rods 120 during overall movement is further improved, and the pull hook blocks 121 are not easy to shake to move.

Further, the adjusting mechanism 2 includes two adjusting rods 210, two adjusting rods 210 are connected to the auxiliary stay 126 and the main support frame 111, two pushing rings 211 are movably sleeved on the two adjusting rods 210, two pushing rings 211 are located outside the four hook blocks 121, two adjusting rods 210 are both provided with adjusting grooves 212, two faces of the two pushing rings 211 are both embedded with threaded sleeves 213, threaded rods 214 are movably sleeved in the four threaded sleeves 213, one end of each of the two pushing rings 211 is provided with a clamping mechanism 3, so that the pushing rods 214 are used for extruding the adjusting grooves 212, the pushing rings 211 can be fixed at specific positions on the adjusting rods 210, the fixed pushing rings 211 can block the stroke of the hook blocks 121, the outward movement of the hook blocks 121 during working is avoided, and the position change of the hook blocks is prevented from causing and the patient wound 121 is excessively stretched, the device has better protection effect and better controllability.

Further, block mechanism 3 includes top position board 310, the one end of top position board 310 is connected on propelling ring 211, the one end of top position board 310 is equipped with bottom position board 312, one side of bottom position board 312 is connected with block pinion rack 313, the two sides of bottom position board 312 all are connected with connecting strip 311 through the pivot, and connecting strip 311 is located the one side of hook piece 121, utilize the removal of hook piece 121 like this, make top position board 310 and bottom position board 312 rise gradually, thereby carry out the centre gripping to the musculature at patient's incision both ends, prevent in the tensile operation process of longer time, cause the musculature at patient's incision both ends to take place the condition of tearing, patient's postoperative misery has been reduced, it is more convenient when follow-up sewing up also to make medical personnel simultaneously.

Furthermore, the other ends of the two connecting strips 311 are both connected with a strong magnetic sheet 315 through a rotating shaft, the pull hook blocks 121 on one side of the two strong magnetic sheets 315 are both provided with an adsorption groove 314, the strong magnetic sheets 315 are inserted into the adsorption groove 314, the inner walls of the two adsorption grooves 314 are both embedded with iron sheets, the bottom position plate 312 is fixedly provided with a clamping strip 316, one end of the clamping strip 316 extends through the top position plate 310, the top position plate 310 on one side of the clamping strip 316 is fixedly provided with a clamping sleeve 317, the clamping strip 316 is uniformly provided with clamping grooves 318, clamping sheets 319 are inserted into the clamping sleeve 317, one side of each clamping sheet 319 is arc-shaped, one side of each clamping sheet 319 is connected with two extrusion springs 320, the other sides of the two extrusion springs 320 are both connected to the inner surface of the clamping sleeve 317, so that the adsorption effect between the strong magnetic sheets 315 and the iron sheets and the clamping effect between the clamping grooves 318 and the clamping sheets 319 are utilized, so that the clamping tooth plate 313 and the top position plate 310 do not excessively clamp the muscle tissue, and the moving range of the hook block 121 is not affected by the connecting strip 311.

Furthermore, a touch block 322 is arranged on the clamping sleeve 317, a touch groove 321 is inserted into the touch block 322, and one end of the touch groove 321 is connected to the clamping piece 319, so that the medical staff can manually release the limit of the clamping piece 319 and the clamping groove 318 after the operation and take the clamping piece out.

The working principle is as follows: when a worker uses the device, the auxiliary stay bar 126 and the main support frame 111 of the device are connected to an operating table, the pull hook blocks 121 and the push ring 211 are pulled to correspond to the positions of the cuts, the four pull hook blocks 121 extend into the cuts, then the four threaded rods 214 are sequentially rotated, the threaded rods 214 rotate under the action of the threaded sleeves 213 and extrude the adjusting grooves 212, and the positions of the push ring 211 are fixed.

After the preparation is completed, the servo motor 114 is started through the control panel 113, so that the servo motor 114 drives the transmission belt 117 to rotate, thereby driving the transmission rod 116 and the screw rod 118 to rotate, that is, the two screw blocks 119 are away from each other, and simultaneously the screw blocks 119 drive the two pull rods 120 and the draw hook blocks 121 to move away from each other, thereby gradually opening the incision, when the two draw hook blocks 121 move, the inclination angle of the connecting strip 311 gradually changes, so that the bottom plate 312 gradually moves towards the top plate 310, that is, the clamping toothed plate 313 gradually cooperates with the top plate 310 to clamp the musculature at the two ends of the incision of the patient, wherein when the bottom plate 312 moves towards the top plate 310, the clamping strip 316 continuously passes through the clamping sleeve 317, so that the opening of the clamping groove 318 continuously impacts the arc-shaped surface of the clamping piece 319, thereby the clamping piece 319 extrudes and contracts the extrusion spring 320, when the inclination angle of the connecting strip 311 can not be changed any more, the hook block 121 can be released from the adsorption groove 314 to be adsorbed and limited and be released because the incision size needs to be moved continuously, the clamping of the clamping groove 318 by the clamping piece 319 can enable the bottom plate 312 and the top plate 310 to continuously clamp the musculature of the patient, and finally the hook block 121 can be opened to the proper size.

When the incision needs to be restored, the medical staff manually pokes the touch groove 321, so that the extrusion spring 320 deforms, the clamping piece 319 and the clamping groove 318 can be limited, the fixation of the muscle tissue can be released, and finally the screw rod 118 is turned over through the control panel 113, so that the two hook blocks 121 can be reset.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.