阅读说明：本技术 一种骨科用克氏针穿刺辅助定位装置 (Auxiliary positioning device for puncture of Kirschner wire for orthopedics department ) 是由 杨建楠 马小龙 于 2020-12-10 设计创作，主要内容包括：本发明公开了一种骨科用克氏针穿刺辅助定位装置,涉及穿刺定位装置技术领域,解决了现有的辅助定位装置,大都没有集成对血水的擦拭清洁机构,需人工频繁擦除穿刺处周围皮肤上的血水,操作使用较为繁琐费力不便的问题。一种骨科用克氏针穿刺辅助定位装置,包括传动箱,所述传动箱包括把杆和摇把,所述传动箱整体呈矩形结构,其顶端支撑焊接有一处L状把杆,且传动箱的前侧壁上转动安装有一处摇把；所述T形架整体由横撑主体板以及竖撑轴杆共同焊接组成,其中横撑主体板上对称贯穿开设有两处滑槽。本发明的海绵可跟随T形架和齿圈旋转对穿刺处流出的血水进行扫擦清理,这省去人工频繁擦拭血水的麻烦,简化了装置的使用操作步骤,省时省力。(The invention discloses an orthopedic Kirschner wire puncture auxiliary positioning device, relates to the technical field of puncture positioning devices, and solves the problems that most of the existing auxiliary positioning devices do not have an integrated wiping and cleaning mechanism for bloody water, the bloody water on the skin around the puncture part needs to be frequently erased manually, and the operation and use are complicated and labor-consuming. The auxiliary positioning device for puncture of the Kirschner wire for orthopedics comprises a transmission case, wherein the transmission case comprises a handle rod and a crank, the transmission case is integrally of a rectangular structure, the top end of the transmission case is supported and welded with an L-shaped handle rod, and the crank is rotatably arranged on the front side wall of the transmission case; the T-shaped frame is integrally formed by welding a cross brace main body plate and a vertical brace shaft rod together, wherein two sliding grooves are symmetrically formed in the cross brace main body plate in a penetrating mode. The sponge can rotate along with the T-shaped frame and the gear ring to clean blood flowing out of the puncture, so that the trouble of frequently wiping the blood by manpower is eliminated, the using and operating steps of the device are simplified, and time and labor are saved.)

1. The utility model provides an orthopedics is with ke shi needle puncture auxiliary positioning device which characterized in that: the automatic positioning device comprises a transmission case (1), wherein the transmission case (1) comprises a handle bar (101), a positioning plate (102) and a crank (104), the transmission case (1) is integrally of a rectangular structure, the top end of the transmission case is supported and welded with an L-shaped handle bar (101), and the crank (104) is rotatably arranged on the front side wall of the transmission case (1); a positioning disc (102) is sleeved and welded on the lower half section of the transmission case (1), a gear ring (2) is rotatably mounted on the positioning disc (102), and the gear ring (2) is rotatably positioned below the bottom of the positioning disc (102); a sliding frame (7) is slidably arranged on the vertical support rod section of the handle rod (101) through a spring pushing sleeve, a positioning ring (4) is fixedly welded at the bottom of the sliding frame (7), and a drill chuck (3) is fixedly arranged on a rotating shaft at the bottom of the transmission case (1); the drill chuck (3) comprises a drill bit (301), the drill bit (301) is clamped and fixed on the drill chuck (3), and the head end of the drill bit (301) extends into a central space inside the positioning ring (4); a hexagonal shaft rod (5) penetrates through and is vertically inserted into the circumferential outer wall of the gear ring (2); a T-shaped frame (6) is slidably arranged on the circumferential inner wall of the positioning ring (4); t shape frame (6) are including erectting and prop axostylus axostyle (603), T shape frame (6) are whole to be formed by stull main part board and erects to prop axostylus axostyle (603) common welding, and wherein the symmetry runs through on the stull main part board and has seted up two spouts.

2. The auxiliary positioning device for puncture of kirschner wires for orthopedics department of claim 1 is characterized in that: the transmission case (1) further comprises a driven gear (103), the bottom of the transmission case (1) is rotatably suspended and supported with the driven gear (103), the driven gear (103) is equal in height to the gear ring (2) and is in meshing contact with the teeth on the inner ring of the gear ring (2), and a driving gear on a rotating shaft at the bottom of the transmission case (1) is correspondingly in meshing contact with the driven gear (103).

3. The auxiliary positioning device for puncture of kirschner wires for orthopedics department of claim 1 is characterized in that: holding ring (4) are including flourishing blood box (401), it has the flourishing blood box (401) of a long strip rectangle to run through the welding on holding ring (4), and T shape frame (6) shore is located the annular space of flourishing blood box (401) top, and the bottom of holding ring (4) is provided with the silica gel buffering ring.

4. The auxiliary positioning device for puncture of kirschner wires for orthopedics department of claim 1 is characterized in that: six arris axle levers (5) are including top wheel (501) and axle sleeve (502), rotate on the top section of six arris axle levers (5) and install a department top wheel (501), and turn the welding to the inside side on the bottom section of six arris axle levers (5) and have a department axle sleeve (502), this axle sleeve (502) and erect bracing axostylus axostyle (603) cover sliding connection.

5. The auxiliary positioning device for puncture of kirschner wires for orthopedics department of claim 4 is characterized in that: the six-edge shaft rod (5) further comprises a connecting rod (503) and a T-shaped sliding plate (504), the bottom section of the shaft sleeve (502) is symmetrically and rotatably connected with the two connecting rods (503), the tail ends of the two connecting rods (503) are rotatably connected with the T-shaped sliding plate (504), and the two T-shaped sliding plates (504) are in sliding fit with the two sliding grooves in the cross support main body plate of the T-shaped frame (6).

6. The auxiliary positioning device for puncture of kirschner wires for orthopedics department of claim 1 is characterized in that: t shape frame (6) still include stull axostylus axostyle (601) and sponge (602), the top support welding of T shape frame (6) stull main part board has a stull axostylus axostyle (601), and two T shape slides (504) are installed on this stull axostylus axostyle (601) through spring top pushing up to the cover cunning, and is fixed with a sponge (602) through magic subsides between two T shape slides (504), and the interlude of this sponge (602) is fixed in the interlude bottom of T shape frame (6) stull main part board through magic subsides.

7. The auxiliary positioning device for puncture of kirschner wires for orthopedics department of claim 1 is characterized in that: the sliding frame (7) comprises a triangular wedge block (701), an L-shaped hanging plate is welded downwards on a sliding ring at the top end of the sliding frame (7), the L-shaped hanging plate is stuck to the rear side wall of the transmission case (1), and the tail end of the L-shaped hanging plate is fixedly welded with the triangular wedge block (701).

8. The auxiliary positioning device for puncture of kirschner wires for orthopedics department of claim 7 is characterized in that: the triangular wedge block (701) is vertically opposite to the blood containing box (401), and the top wheel (501) rotates to contact with the triangular wedge block (701) in a rolling mode.

Technical Field

The invention relates to the technical field of puncture positioning devices, in particular to an orthopedic Kirschner wire puncture auxiliary positioning device.

Background

In an orthopedic surgery, a kirschner wire is usually required to penetrate through a bone block through skin and soft tissue and then to be drilled into another preset bone block for fixation, in the surgery, as the length of the kirschner wire is longer and the drilling direction is slightly deviated, the final drilling position has larger deviation and cannot reach the expected position, at present, under the condition, a doctor can poke the kirschner wire in an incision of the surgery by using a tool to deflect the tip of the kirschner wire to the preset direction and then continue to drill; because the deviation is within several millimeters under most conditions, and the Kirschner wire has good elasticity, the poking effect is not obvious, the one-time success cannot be achieved, the repeated clamping and fixing are needed, and the efficiency is greatly reduced, so the Kirschner wire positioner is mostly adopted for auxiliary positioning at present, but the positioning assembly and the fixing structure of the conventional Kirschner wire positioner are generally arranged in a mutually perpendicular mode, the included angle between the positioning assembly and the fixing structure cannot be adjusted according to the specific fixing angle, and the puncture of the Kirschner wire is inconvenient; therefore, it is very necessary to provide an orthopedic kirschner wire puncture auxiliary positioning device with reasonable structural design and a puncture angle convenient to adjust.

For example, patent No. CN201610092008.4 discloses a minimally invasive spine surgery positioner through percutaneous puncture, which comprises a base and two sets of positioning components, wherein the base is composed of two half bases butted together through an eccentric wheel locking mechanism; a sliding groove extending along the length direction is formed in the base, and a first scale for measuring the length is arranged on the outer surface of the base; the positioning assemblies consist of sliding shafts, angle quantization plates and puncture guide rods, wherein the sliding shafts in the two sets of positioning assemblies are arranged in sliding grooves in the base body, and the sliding shafts and the sliding grooves are matched by arc surfaces; one end of the sliding shaft is provided with a mounting groove with an opening along the axis, and the other end of the sliding shaft is provided with a second scale used for measuring the rotation angle of the sliding shaft; the angle quantization plate is in a 90-degree fan shape, and a third scale for measuring the angle is arranged on the fan-shaped angle quantization plate; the puncture guide rod is provided with a guide hole along the axial lead and transversely penetrates through the mounting groove.

The existing auxiliary positioning device is mostly not provided with an integrated wiping and cleaning mechanism for the bloody water, the bloody water on the skin around the puncture position needs to be frequently erased manually, the operation and the use are complicated, labor is wasted, inconvenience is caused, and the fence for the bloody water is mostly not integrated to block the collecting mechanism, so that the bloody water easily flows around to pollute the operating table in a large area, and the trouble of follow-up cleaning is caused.

Disclosure of Invention

The invention aims to provide an orthopedic Kirschner wire puncture auxiliary positioning device, which solves the problems that most of the background technologies do not integrate a wiping and cleaning mechanism for blood, the blood on the skin around the puncture part needs to be wiped frequently manually, and the operation and use are complicated, labor is wasted and inconvenient.

In order to achieve the purpose, the invention provides the following technical scheme: the auxiliary positioning device for puncture of the Kirschner wire for orthopedics comprises a transmission case, wherein the transmission case comprises a handle bar, a positioning disc and a crank, the transmission case is integrally rectangular, the top end of the transmission case is supported and welded with an L-shaped handle bar, and the crank is rotatably arranged on the front side wall of the transmission case; a positioning disc is sleeved and welded on the lower half section of the transmission case, a gear ring is rotatably arranged on the positioning disc, and the gear ring is rotatably positioned below the bottom of the positioning disc; a sliding frame is slidably arranged on the vertical support rod section of the handle rod through a spring pushing sleeve, a positioning ring is fixedly welded at the bottom of the sliding frame, and a drill chuck is fixedly arranged on a rotating shaft at the bottom of the transmission case; the drill chuck comprises a drill bit, wherein the drill bit is clamped and fixed on the drill chuck, and the head end of the drill bit extends into a central space in the positioning ring; a hexagonal shaft rod is vertically inserted through the circumferential outer wall of the gear ring; a T-shaped frame is slidably arranged on the circumferential inner wall of the positioning ring; the T-shaped frame comprises a vertical support shaft rod, the whole T-shaped frame is formed by welding a cross support main body plate and the vertical support shaft rod together, and two sliding grooves are symmetrically formed in the cross support main body plate in a penetrating mode.

Preferably, the transmission case further comprises a driven gear, the bottom of the transmission case is rotatably suspended and supported by the driven gear, the driven gear is equal in height to the gear ring and is in meshing contact with the teeth on the inner ring of the gear ring, and the driving gear on the rotating shaft at the bottom of the transmission case is correspondingly in meshing contact with the driven gear.

Preferably, the holding ring includes flourishing blood box, it has the flourishing blood box of a department's long strip rectangle to run through the welding on the holding ring, and T shape frame shore lies in the annular space of flourishing blood box top, and the bottom of holding ring is provided with silica gel buffer ring.

Preferably, the hexagonal shaft rod comprises a top wheel and a shaft sleeve, the top end section of the hexagonal shaft rod is rotatably provided with the top wheel, the bottom section of the hexagonal shaft rod is bent inwards and welded with the shaft sleeve, and the shaft sleeve is connected with the vertical support shaft rod in a sliding mode.

Preferably, six arris axle levers still include connecting rod and T shape slide, the symmetry is rotated on the section of axle sleeve bottom and is connected with two connecting rods, and the tail end of these two connecting rods all rotates and is connected with a T shape slide, and two spout sliding fit on two T shape slides and the T shape frame stull main part board.

Preferably, the T-shaped frame further comprises a cross-brace shaft rod and a sponge, the top end of the T-shaped frame cross-brace main body plate is supported and welded with the cross-brace shaft rod, two T-shaped sliding plates are installed on the cross-brace shaft rod in a sliding mode through opposite sleeves in a spring pushing mode, a sponge is fixed between the two T-shaped sliding plates through a magic tape, and the middle section of the sponge is fixed to the bottom of the middle section of the T-shaped frame cross-brace main body plate through the magic tape.

Preferably, the sliding frame comprises a triangular wedge block, an L-shaped hanging plate is welded downwards on the sliding ring at the top end of the sliding frame, the L-shaped hanging plate is clamped and attached to the rear side wall of the transmission case, and the triangular wedge block is welded and fixed at the tail end of the L-shaped hanging plate.

Preferably, the triangular wedge block is vertically opposite to the blood containing box, and the top wheel rotates to contact with the top roller of the triangular wedge block.

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

1. the transmission ratio of the driven gear and the gear ring is large, the speed reduction effect is achieved, the gear ring, the T-shaped frame and the sponge can be guaranteed to rotate at a low speed, and bruise to skin of a punctured part due to the fact that the rotating speed is too high is avoided;

2. the positioning ring can be pressed on the skin by the spring on the handle rod to position the device, so that the device is prevented from being unstably moved in the drilling and puncturing process, and the silica gel buffer ring at the bottom of the positioning ring has a sealing effect and can be tightly pressed and contacted with the skin, so that the refuge blood flows in a scattered manner to pollute the operating table in a large area, and the subsequent cleaning trouble is caused;

3. the two connecting rods, the two T-shaped sliding plates and the shaft sleeve form a double-connecting-rod sliding block mechanism, and the six-edge shaft rod can slide up and drive the two T-shaped sliding plates to slide inwards along the cross-brace shaft rod to squeeze water for the sponge, so that the trouble of squeezing water for the sponge manually or the trouble of frequently replacing the dry sponge is eliminated, and the use and the operation are convenient;

4. the sponge can rotate along with the T-shaped frame and the gear ring to clean blood flowing out of the puncture part, so that the trouble of frequently wiping the blood by manpower is eliminated, the using and operating steps of the device are simplified, and time and labor are saved;

5. the water squeezing action of the sponge can be driven by the rotary power of the drill bit, so that additional manual force is saved for jacking and squeezing the sponge, the labor intensity of surgeons and nurses is reduced, the blood containing box is positioned right below the triangular wedge block, the sponge can be guaranteed to start the water squeezing action when being rotatably arranged at the top end of the blood containing box, the squeezed blood can be dripped into the blood containing box, and the trouble of secondary cleaning caused by the fact that the squeezed blood is directly dripped onto the skin at the puncture position is avoided.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of the rear three-dimensional structure of the present invention;

FIG. 3 is a schematic bottom three-dimensional structure of the present invention;

FIG. 4 is a schematic view of the T-shaped frame structure of the present invention;

FIG. 5 is a schematic view of the construction of the bushing of the present invention;

FIG. 6 is a schematic view of a ring gear configuration of the present invention;

FIG. 7 is an enlarged view of portion A of FIG. 3 according to the present invention;

FIG. 8 is an enlarged view of portion B of FIG. 1 according to the present invention;

FIG. 9 is an enlarged view of the portion C of FIG. 2;

in the drawings, the corresponding relationship between the component names and the reference numbers is as follows:

1. a transmission case; 101. a handle bar; 102. positioning a plate; 103. a driven gear; 104. a crank; 2. a ring gear; 3. a drill chuck; 301. a drill bit; 4. a positioning ring; 401. a blood containing box; 5. a hexagonal shaft; 501. a top wheel; 502. a shaft sleeve; 503. a connecting rod; 504. a T-shaped slide plate; 6. a T-shaped frame; 601. a cross-brace shaft lever; 602. a sponge; 603. a vertical support shaft lever; 7. a sliding frame; 701. a triangular wedge 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.

Referring to fig. 1 to 9, an embodiment of the present invention includes: an orthopedic Kirschner wire puncture auxiliary positioning device comprises a transmission case 1, wherein the transmission case 1 comprises a handle rod 101, a positioning disc 102 and a crank 104, the transmission case 1 is integrally rectangular, the top end of the transmission case 1 is supported and welded with an L-shaped handle rod 101, and the front side wall of the transmission case 1 is rotatably provided with the crank 104; a positioning disc 102 is sleeved and welded on the lower half section of the transmission case 1, a gear ring 2 is rotatably mounted on the positioning disc 102, and the gear ring 2 is rotatably positioned below the bottom of the positioning disc 102; a sliding frame 7 is slidably arranged on the vertical support rod section of the handle rod 101 through a spring pushing sleeve, a positioning ring 4 is fixedly welded at the bottom of the sliding frame 7, and a drill chuck 3 is fixedly arranged on a rotating shaft at the bottom of the transmission case 1; the drill chuck 3 comprises a drill bit 301, the drill chuck 3 is fixedly clamped with the drill bit 301, and the head end of the drill bit 301 is inserted into the space at the center inside the positioning ring 4; a hexagonal shaft rod 5 penetrates through and is vertically inserted into the circumferential outer wall of the gear ring 2; a T-shaped frame 6 is slidably arranged on the circumferential inner wall of the positioning ring 4; the T-shaped frame 6 comprises a vertical support shaft rod 603, the whole T-shaped frame 6 is formed by welding a cross support main body plate and the vertical support shaft rod 603 together, wherein two sliding grooves are symmetrically formed in the cross support main body plate in a penetrating mode; the hexagonal shaft rod 5 comprises a top wheel 501 and a shaft sleeve 502, the top end section of the hexagonal shaft rod 5 is rotatably provided with the top wheel 501, the bottom section of the hexagonal shaft rod 5 is bent inwards and welded with the shaft sleeve 502, and the shaft sleeve 502 is connected with the vertical support shaft rod 603 in a sleeved sliding manner; the sliding frame 7 comprises a triangular wedge block 701, an L-shaped hanging plate is welded downwards on a sliding ring at the top end of the sliding frame 7, the L-shaped hanging plate is stuck on the rear side wall of the transmission case 1, and the tail end of the L-shaped hanging plate is fixedly welded with the triangular wedge block 701; the transmission case 1 further comprises a driven gear 103, the bottom of the transmission case 1 is rotated to hang and support the driven gear 103, the driven gear 103 is equal in height to the gear ring 2 and is in meshed contact with the teeth on the inner ring of the gear ring 2, the driving gear on the rotating shaft at the bottom of the transmission case 1 is correspondingly in contacted and meshed with the driven gear 103, the transmission ratio of the driven gear 103 to the gear ring 2 is large, the speed reduction effect is achieved, the gear ring 2, the T-shaped frame 6 and the sponge 602 can be guaranteed to rotate at a low speed, and bruise caused by the fact that the rotating speed is too fast to the skin of a punctured part.

Further, holding ring 4 includes flourishing blood box 401, it has a long strip rectangle flourishing blood box 401 to run through the welding on holding ring 4, 6 apical braces of T shape frame are located the annular space of flourishing blood box 401 top, and the bottom of holding ring 4 is provided with the silica gel buffering ring, holding ring 4 can be fixed a position the device on the skin by the spring roof pressure on the barre 101 and avoid the device to collect and move at drilling puncture in-process unstability, and the silica gel buffering ring of holding ring 4 bottom still has sealed effect it can compress tightly the contact with the skin, the blood water of taking shelter trickles the large tracts of land operating table and makes dirty all around, cause the trouble of follow-up clearance.

Further, the hexagonal shaft rod 5 further comprises a connecting rod 503 and a T-shaped sliding plate 504, the bottom section of the shaft sleeve 502 is symmetrically and rotatably connected with the two connecting rods 503, the tail ends of the two connecting rods 503 are rotatably connected with the T-shaped sliding plate 504, the two T-shaped sliding plates 504 are in sliding fit with the two sliding grooves in the cross support main body plate of the T-shaped frame 6, the two connecting rods 503, the two T-shaped sliding plates 504 and the shaft sleeve 502 form a double-connecting-rod sliding block mechanism together, the hexagonal shaft rod 5 can slide upwards to drive the two T-shaped sliding plates 504 to slide inwards along the cross support shaft rod 601 to squeeze water for the sponge 602, the trouble of manually squeezing water for the sponge 602 or the trouble of frequently replacing the dry sponge 602 is eliminated, and the use and the operation are convenient.

Further, T shape frame 6 still includes stull axostylus axostyle 601 and sponge 602, the top of the 6 stull main part boards of T shape frame supports the welding and has a stull axostylus axostyle 601, two places T shape slide 504 pass through the spring top and push up the smooth installation of opposite direction cover on this stull axostylus axostyle 601, and be fixed with a sponge 602 through the magic subsides between two places T shape slide 504, the interlude of this sponge 602 is fixed in the interlude bottom of the 6 stull main part boards of T shape frame through the magic subsides, sponge 602 can follow T shape frame 6 and the rotatory blood water that flows to puncture department and clean the clearance of sweeping of 2, this trouble of frequently wiping the blood water of manual work is saved, the use operation step of device has been simplified.

Further, the triangular wedge block 701 is opposite to the blood containing box 401 from top to bottom, the top wheel 501 rotates to contact with the triangular wedge block 701 in a rolling mode, the gear ring 2 can rotate to drive the top wheel 501 to contact with the triangular wedge block 701 in a rolling mode to push the hexagonal shaft rod 5 to slide up and down to squeeze water for the sponge 602, and then the water squeezing action of the sponge 602 can be driven by the rotary power of the drill bit 301, so that extra manual force is omitted to squeeze the water for the sponge 602 in a pressing mode, the labor intensity of surgeons and nurses is reduced, the blood containing box 401 is located under the triangular wedge block 701, the sponge 602 can be guaranteed to start the water squeezing action when being placed at the top end of the blood containing box 401 in a rotating mode, extruded blood can be dripped into the blood containing box 401, and the trouble that the extruded blood is directly dripped onto skin at a puncture position to cause secondary cleaning is avoided.

The working principle is as follows: the positioning ring 4 can be pressed on the skin by a spring on the rod 101 to position the device to avoid the device from being unstably moved in the drilling and puncturing process, the silica gel buffer ring at the bottom of the positioning ring 4 has a sealing effect and can be tightly pressed and contacted with the skin to prevent blood from flowing around to dirty the operating table in a large area, the transmission ratio of the driven gear 103 and the gear ring 2 is large, the speed reduction effect is realized, the gear ring 2, the T-shaped frame 6 and the sponge 602 can be ensured to rotate at a lower speed, the skin of a punctured part is prevented from being contused due to an overhigh rotating speed, the sponge 602 can sweep and clean the blood flowing out from the punctured part along with the rotation of the T-shaped frame 6 and the gear ring 2, the trouble of manually and frequently wiping the blood is omitted, the gear ring 2 can rotate to drive the top wheel 501 to be in rolling contact with the triangular wedge block 701 to push the hexagonal shaft rod 5 to slide up and down, and the two connecting rods 503, the two T-shaped sliding, through this mechanism hexagonal shaft pole 5 can slide upward and drive two T shape slide plates 504 and slide inwards along stull axostylus axostyle 601 and squeeze water to sponge 602 mutually, this saves the manual work and implements the trouble of squeezing water or save the trouble of frequently changing dry sponge 602 to sponge 602, and the power transmission through ring gear 2, the action of squeezing water of sponge 602 can utilize the rotary power of drill bit 301 to order about, this saves extra manual power and carries out roof pressure squeezing water to sponge 602, the intensity of labour of operating doctor and nurse has been reduced, and flourishing blood box 401 is located triangle voussoir 701 under, this can guarantee that sponge 602 just begins to squeeze water the action when rotating the top of placing in flourishing blood box 401, make extruded bloody water can drip and arrange in flourishing blood box 401, avoid extruded bloody water to drip directly and arrange on the skin of puncture position, cause the trouble of secondary clearance.

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.