CN115227332A - Sheath saw blade with cooling system - Google Patents

Abstract

The invention discloses a sheath-protecting saw blade with a cooling system, which comprises: the saw blade body comprises a main body extending along the longitudinal direction, a driving part connected with the rear end of the main body and saw teeth connected with the front end of the main body, and a saw blade interface connected with the machine head interface is arranged on the driving part; the protective sheath is sleeved on the saw blade body and comprises a lower side plate and an upper side plate; further comprising: the sealing piece is arranged in the rear end of the protective sheath and is in sealing fit with the main body, the lower side plate and the upper side plate to form a saw blade cooling cavity extending backwards and forwards, and a cooling liquid inlet communicated with the saw blade cooling cavity is formed in the rear end of the lower side plate or the upper side plate. The sheath-protecting saw blade with the cooling system has the advantages of simple and reliable structure, convenience in installation, small thickness increase of the sheath-protecting saw blade and no blocking of the view of a doctor in use.

Description

Sheathed saw blades with cooling system

technical field

The invention relates to the technical field of medical instruments, in particular to a sheath saw blade with a cooling system.

Background technique

In orthopedic surgery, the medical oscillating saw is a common tool for sawing bones. The medical oscillating saw usually consists of a sheath saw blade and a machine head. The sheath saw blade includes the saw blade body and the sheath covering the saw blade body. The sheath Fixed on the machine head, the saw blade body swings in the protective sheath under the drive of the machine head to form sawing. Due to the high-frequency and severe friction between the saw blade body and the hard bone, the temperature of the saw blade body rises. During the operation, the high-temperature saw blade body is likely to cause burns to surrounding tissues and organs, affecting the safety of the operation.

In order to solve the above problems, some adopt the mode of spraying water to the saw blade from the outside to cool down, and some adopt a simple welding of a water injection pipe on one side of the sheath, and inject water to the saw blade through the water injection pipe. The former cooling method needs another person to assist in water spraying, which is complicated and difficult to operate. The water injection pipe of the latter cooling method is easy to block the surgical field of view, and the strength is not good, and it is easy to break and damage. On the long water injection pipe, the operation is inconvenient and difficult.

Contents of the invention

In view of the above-mentioned current state of the art, the technical problem to be solved by the present invention is to provide a sheath saw blade with a cooling system that is simple to operate and does not block the field of view during use.

In order to solve the above technical problems, the present invention provides a sheathed saw blade with a cooling system, comprising: a saw blade body, including a main body extending longitudinally, a driving part connected to the rear end of the main body and a front end connected to the main body sawtooth, the driving part is provided with a saw blade interface for connecting with the machine head interface; a protective sheath is sheathed on the saw blade body, and the protective sheath includes a lower side plate and an upper side plate; also includes: a seal , arranged in the rear end of the protective sheath, and sealingly fit with the main body, the lower side plate, and the upper side plate to form a saw blade cooling cavity extending from the rear to the front, the lower side plate or the upper side plate The rear end of the upper side plate is provided with a cooling liquid inlet communicating with the saw blade cooling chamber.

The sheath saw blade with a cooling system of the present invention has a simple and reliable structure, is easy to install, has a small increase in thickness for the sheath saw blade, and will not block the doctor's field of vision during use.

In one of the embodiments, the sealing member includes a first side sealing part and a second side sealing part surrounding the longitudinal sides of the driving part and symmetrical along the longitudinal central axis of the driving part, and the first side The sealing part, the position where the second side sealing part is in contact with the driving part, the lower side plate and the upper side plate has an elastic structure for contacting the driving part, the lower side plate and the The upper side panels form a seal.

In one of the embodiments, the cooling liquid inlet includes a first cooling liquid inlet and a second cooling liquid inlet provided on the rear end of the lower side plate or the upper side plate, and the first side sealing part and the bottom surface or top surface of the second side sealing part is provided with a guide groove, the saw blade cooling chamber includes a side surface formed in the transverse direction of the main body, the first side sealing part and the protective sheath transversely The first side flow channel between the upper side wall, the other side surface formed in the transverse direction of the main body, the second side sealing portion and the second side wall formed in the transverse direction of the sheath The two side flow passages and the diversion groove on the first side sealing part are connected to the first coolant inlet and the first side flow passage, and the diversion groove on the second side sealing part is connected to the first side passage. The second coolant inlet and the second side channel.

In one of the embodiments, it further includes a first support body and a second support body, the first support body and the second support body are arranged on both sides of the drive part and along the longitudinal central axis of the drive part Symmetry; the first side sealing part and the bottom surface or the top surface of the second side sealing part are respectively provided with a first installation groove for installing the first support body and a first installation groove for installing the second support body The second installation groove, and the depth of the first installation groove and the second installation groove is greater than the thickness of the first support body and the second support body, the first support body and the second support body The body is respectively installed in the first installation groove and the second installation groove.

In one of the embodiments, the coolant inlet includes a first coolant inlet and a second coolant inlet provided on the rear end of the lower side plate or the upper side plate, and the saw blade cooling chamber includes A first side flow channel formed between a lateral side of the main body, a side of the first support body facing away from the driving part, and a lateral side wall of the sheath, is formed in the The other lateral side of the main body, the second side channel between the side of the second support body facing away from the driving part and the other side wall of the sheath in the lateral direction communicates with the first cooling A first communication channel connecting the liquid inlet with the first side channel and a second communication channel connecting the second coolant inlet with the second side channel.

In one embodiment, the sealing member includes a first side sealing portion surrounding one longitudinal side of the driving portion and a second side sealing portion surrounding the other longitudinal side of the driving portion, the first side sealing portion The second side sealing portion is in sealing fit with the lower side plate and the upper side plate, and the second side sealing portion is in sealing fit with the lower side plate and the upper side plate.

In one embodiment, the bottom surface or the top surface of the first side sealing part and the second side sealing part are respectively provided with a first installation groove for installing the first support body and a first installation groove for installing the first The second installation groove of the two supports, and the depth of the first installation groove and the second installation groove is greater than the thickness of the first support body and the second support body, and the first support body and the second installation groove are thicker than the thickness of the first support body and the second support body The second supporting body is respectively installed in the first installation groove and the second installation groove.

In one embodiment, the first installation groove has a side opening facing away from the driving part, the first support body is provided with a first through groove, one end of the first through groove penetrates to the first a support body facing away from the side of the driving part, the first through groove and the bottom surface of the first installation groove, the inner surface of the lower side plate or the inner surface of the upper side plate form the first communication channel, The second installation groove has a side opening facing away from the driving part, a second through groove is provided on the second support body, and one end of the second through groove penetrates until the second support body faces away from the drive part. The side surface of the driving part, the second through groove and the bottom surface of the second installation groove, the inner surface of the lower side plate or the inner surface of the upper side plate form the second communication channel.

In one embodiment, the first coolant inlet and the second coolant inlet are respectively opposite to the first through groove and the second through groove, and the first coolant inlet and the second A self-sealing joint is provided at the inlet of the cooling liquid, and joint positioning grooves are provided at positions corresponding to the first through groove and the second through groove and the self-sealing joint, and the head of the self-sealing joint is in contact with the joint Locating groove fit.

In one embodiment, the sealing member further includes a sealing ring, the sealing ring is sleeved on the main body, and two ends of the sealing ring in the transverse direction are respectively connected with the first side sealing part and the second side sealing part. The front ends of the side sealing parts are connected, and the sealing ring is in sealing fit with the main body, the upper side plate and the lower side plate.

In one embodiment, at least one first sealing bead extending transversely is provided on the bottom surface and the top surface of the sealing ring, and the first sealing bead is sealed with the lower side plate and the upper side plate Cooperate.

In one embodiment, a support ring is provided in the central hole of the sealing ring corresponding to the first sealing rib.

In one embodiment, the bottom wall and the top wall of the central hole of the sealing ring are provided with at least one second sealing bead extending in the transverse direction, and the second sealing bead is connected to the bottom surface and the top surface of the main body. Seal fit.

In one embodiment, at least one sealing groove extending in the transverse direction is provided on the bottom surface and the top surface of the main body, and the second sealing rib is snapped into the sealing groove.

In one embodiment, the sealing ring further includes an elastic expansion part located behind the second sealing bead, and a swing cavity is provided between the inner wall of the elastic expansion part and the main body.

In one embodiment, a plurality of transversely extending grooves are formed on the top and bottom surfaces of the telescopic portion.

In one embodiment, the positions of the lower side plate and the upper side plate corresponding to the sealing ring are respectively provided with a first escape groove and a second escape groove, and the seal ring is located on the first The avoidance groove and the second avoidance groove.

The beneficial effects of the additional technical features of the present invention will be described in the specific implementation of this specification.

Description of drawings

1 is a perspective view of a medical pendulum saw in an embodiment of the present invention;

Fig. 2 is a top view of the medical oscillating saw shown in Fig. 1;

Fig. 3 is a sectional view along line A-A in Fig. 2;

Fig. 4 is a perspective view of the sheath saw blade of the medical oscillating saw shown in Fig. 1;

Fig. 5 is an exploded structure diagram of the sheath saw blade shown in Fig. 4;

Fig. 6 is a perspective view of the saw blade body of the sheath saw blade shown in Fig. 5;

Fig. 7 is a partially enlarged schematic diagram along the I place in Fig. 6;

Fig. 8 is a perspective view of the first support body of the sheath saw blade shown in Fig. 4;

9 is a perspective view of a seal of the sheath saw blade shown in FIG. 4;

Figure 10 is a top view of the seal shown in Figure 9;

Fig. 11 is a sectional view along the line B-B in Fig. 10;

Fig. 12 is a partially enlarged schematic diagram of place A in Fig. 11;

Fig. 13 is a partial enlarged schematic diagram at B in Fig. 11;

14 is a perspective view of the first self-sealing joint of the sheath saw blade shown in FIG. 4;

Figure 15 is a cross-sectional view of the first self-sealing joint shown in Figure 14;

Fig. 16 is a top view of the sheath saw blade shown in Fig. 4;

Fig. 17 is a sectional view along line C-C in Fig. 16;

Fig. 18 is a partially enlarged schematic diagram at position C in Fig. 17;

Fig. 19 is a partial enlarged schematic diagram at D in Fig. 17;

Figure 20 is a cross-sectional view along line D-D in Figure 16;

Fig. 21 is a partially enlarged schematic diagram of E in Fig. 20;

Fig. 22 is an exploded view of the lower side plate of the sheath saw blade shown in Fig. 4;

Fig. 23 is a partial enlarged schematic diagram at F in Fig. 22;

Fig. 24 is a partially enlarged schematic diagram at G in Fig. 3;

Fig. 25 is a perspective view of the head housing of the medical oscillating saw shown in Fig. 1;

Figure 26 is a top view of the nose housing shown in Figure 25;

Figure 27 is a cross-sectional view along line E-E in Figure 26;

Figure 28 is a front view of the cooling ring of the head housing shown in Figure 26;

Figure 29 is a cross-sectional view of the cooling ring shown in Figure 28;

Fig. 30 is a sectional view along line K-K in Fig. 28;

Figure 31 is a cross-sectional view along the line H-H in Figure 28;

Figure 32 is a perspective view of a second self-sealing joint;

Figure 33 is a sectional view of two self-sealing joints;

Figure 34 is a sectional view along line E-E in Figure 2;

FIG. 35 is a partially enlarged schematic view at G in FIG. 34 .

Explanation of reference signs:

1. Sheath saw blade; 11. Saw blade body; 111. Main body; 112. Saw teeth; 113. Driving part; 114. Driving hole; 115. Guide compression groove; 116. Sealing groove; 12. Lower side plate; 121. The first avoidance hole; 122. The first avoidance groove; 123. The first coolant inlet; 124. The second coolant inlet; 125. The positioning protrusion of the support body; 126. The first avoidance groove; 127. Ring Raised strip; 13, upper side plate; 131, convex edge; 132, second avoidance hole; 133, second avoidance groove; 134, second avoidance groove; 14, seal; 141, sealing ring; 141a, center hole 141b, the first sealing rib; 141c, the second sealing rib; 141d, the elastic expansion part; 141e, the groove; 142, the first side sealing part; 142a, the first installation groove; 143, the second side sealing part ; 143a, the second installation groove; 144, the support ring; 145, the swing cavity; 15, the first support body; 152, the first through groove; 153, the joint positioning groove; 154, the support body positioning groove; Support body; 171, first communication flow channel; 172, second communication flow channel; 173, first side flow channel; 174, second side flow channel; 18, first self-sealing joint; 181, first installation 182, insertion hole; 183, saw blade installation groove; 184, annular sealing rib; 2, machine head; 21, machine head shell; 211, shell; 211a, coolant outlet; 211b, liquid injection port; 212 , cooling ring; 212a, spacer ring; 212b, communication hole; 212c, sealing ring installation groove; 212d, cooling groove; 212e, installation bayonet; 212f, external thread; 213, first shell; 214, second shell; 215 , liquid injection joint; 22, front-end sealing ring; 23, rear-end sealing ring; 24, intermediate sealing ring; 251, the first cooling cavity unit; 252, the second cooling cavity unit; 253, the third cooling cavity unit ;25, the second self-sealing joint; 251, the second installation part; 252, the plug; 253, the annular sealing groove; 254, the external thread; 26, the eccentric shaft; 27, the shift fork; 28, the swing shaft; Pin; 3, handle; 4, injection tube;

Detailed ways

In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings. Obviously, the specific details described below are only a few of the embodiments of the invention, which can also be practiced in many other embodiments than those described herein. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work, all belong to the protection scope of the present invention.

Herein, when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The orientation words involved, such as front, rear, upper, and lower, are defined by the parts in the drawings and the positions between the parts in the drawings, just for the clarity and convenience of expressing the technical solution. It should be understood that the use of the location words should not limit the scope of protection claimed in this application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the present invention is for the purpose of describing specific embodiments only, and is not intended to limit the present invention.

As shown in Figures 1-3, the medical oscillating saw in the embodiment of the present invention includes a sheath saw blade 1 and a power handpiece, wherein the power handpiece includes a handle 3 and a head 2 connected to the front end of the handle 3. The front end is connected with the rear end of the sheath saw blade 1.

As shown in Figures 4, 5 and 6, the sheath saw blade 1 includes a saw blade body 11, a sheath, a first support body 15, a second support body 16 and a seal 14, and the saw blade body 11 can swing along the swing axis, The saw blade body 11 is in the shape of a strip extending longitudinally, and includes a main body 111 , a driving part 113 connected to an end of the main body 111 close to the power handpiece, and a sawtooth 112 connected to an end of the main body 111 away from the power handpiece. During work, the machine head 2 drives the saw blade body 11 to swing around the pendulum axis so as to drive the sawtooth 112 to swing to form sawing. The protective sheath is overcoated on the saw blade body 11, and the protective sheath mainly plays the role of protecting the saw blade body 11. As an example, the protective sheath includes a lower side plate 12 and an upper side plate 13, on the lateral sides of the upper side plate 13, a convex edge 131 protruding to the side of the lower side plate 12 is provided, and the lower side plate 12 After fastening with the upper side plate 13 , the above-mentioned convex edge 131 is in close contact with the lateral side edges of the lower side plate 12 , thereby forming an inner cavity for accommodating the saw blade body 11 between the lower side plate 12 and the upper side plate 13 .

As shown in Figure 6, the saw blade interface as an example includes a number of driving holes 114 arranged at intervals along the circumferential direction with the pendulum axis as the center. The rear end of the side plate 13 is respectively provided with a first avoidance hole 121 and a second avoidance hole 132 (see FIG. 5 ) for the drive pin 281 to pass through and avoid the drive pin 281, the first escape hole 121 and the second avoidance hole 132 It is opposite to the driving hole 114 . The driving pin 281 swings back and forth along the arc direction of the swing of the saw blade body 11, driving the driving hole 114 to rotate back and forth, and then the sawtooth 112 swings back and forth. In this embodiment, the driving part 113 of the saw blade body 11 is provided with a guiding and pressing groove 115 for cooperating with the locking member on the machine head 2, and the lower side plate and the upper side plate 13 correspond to the guiding and pressing groove 115. A first avoidance groove 122 and a second escape groove 133 are arranged on the ground. The setting of the guiding and pressing groove 115 facilitates the installation of the protective sheath and the saw blade body 11 , improves the installation efficiency during the operation, and shortens the operation time.

The first support body 15 and the second support body 16 are respectively located between the lower side plate 12 and the upper side plate 13 on both longitudinal sides of the driving part 113 , the first support body 15 and the second support body 16 It is ensured that the rear end of the protective sheath will not deform when pressed by the locking member on the machine head 2, and the driving part 113 of the saw blade body 11 is prevented from being squeezed after the rear end of the protective sheath is deformed to affect the swing of the saw blade body 11. As shown in FIGS. 5 and 8 , as an example, the first support body 15 and the second support body 16 are plate-like structures, and the side of the first support body 15 and the second support body 16 facing the driving part 113 is the same as the driving part. The outer contour shape of 113 matches the arc shape. The first support body 15 and the second support body 16 are provided with support body positioning grooves 154, and the lower side plate 12 is provided with support body positioning protrusions 125 (see FIG. 5) matched with the support body positioning grooves 154. The support body positioning grooves 154 are used to cooperate with the support body positioning protrusions 125 of the lower side plate 12. After the lower side plate 12 and the upper side plate 13 are installed in place, the positioning grooves on the first support body 15 and the second support body 16 can be used. The first support body 15 and the second support body 16 are accurately positioned and fixed.

The sealing member 14 is arranged in the rear end of the protective sheath, and is sealed with the main body 111, the lower side plate 12, and the upper side plate 13 to form a saw blade cooling cavity extending from the back to the front. The lower side plate 12 or the rear end of the upper side plate 13 are provided with cooling liquid inlets 123 , 124 communicating with the saw blade cooling cavity. Sheath saw blade 1 among the present embodiment, by integrating saw blade cooling chamber in the sheath, the rear end of sheath is provided with coolant inlet simultaneously. When the sheath saw blade 1 is assembled on the machine head 2, the coolant inlets 123, 124 can be connected to the coolant outlet 211a on the machine head 2 or directly to the water injection pipe, and the coolant flows along the saw blade cooling chamber to the cutter head , which can achieve good cooling and flushing of the saw blade head during the operation, and the increased thickness is small, which will not block the doctor's field of vision during use.

Preferably, the coolant inlets 123, 124 include a first coolant inlet 123 and a second coolant inlet 124 arranged on the rear end of the lower side plate 12 or the upper side plate 13, and the saw blade The cooling cavity includes a first side flow formed between a lateral side of the main body 111 , a side of the first support body 15 facing away from the driving part 113 , and a lateral side wall of the sheath. Road 173 , formed on the other lateral side of the main body 111 , the second side between the side of the second support body 16 facing away from the driving part 113 and the other lateral side wall of the sheath The side channel 174, the first communication channel 171 connecting the first coolant inlet 123 and the first side channel 173, and the second coolant inlet 124 and the second side channel 174 of the second communication channel 172. In this way, the cooling liquid is delivered through two cooling liquid inlets and two side flow channels, increasing the flow rate and improving the cooling effect.

As shown in FIGS. 9-13 , the sealing member 14 includes a first side sealing portion 142 surrounding one longitudinal side of the driving portion 113 and a second side sealing portion 143 surrounding the other longitudinal side of the driving portion 113 . , the first side sealing portion 142 is in sealing fit with the lower side plate 12 and the upper side plate 13 , and the second side sealing portion 143 is in sealing cooperation with the lower side plate 12 and the upper side plate 13 . A first communication flow passage 171 and a second communication flow passage 172 are formed at the rear end of the sheath by the first side sealing portion 142 and the second side sealing portion 143 . In this embodiment, the bottom surface or the top surface of the first side sealing portion 142 and the second side sealing portion 143 are respectively provided with a first mounting groove 142a for mounting the first support body 15 and a first mounting groove 142a for mounting the first support body 15 . The second installation groove 143a of the second support body 16, and the depth of the first installation groove 142a and the second installation groove 143a is greater than the thickness of the first support body 15 and the second support body 16 , the first support body 15 and the second support body 16 are respectively installed in the first installation groove 142a and the second installation groove 143a. In this way, after the upper side plate 13 and the lower side plate 12 are installed and welded in place, the elastic sealing surface of the sealing member 14 is squeezed through the upper side plate 13 and the lower side plate 12, so that the upper and lower sides of the sealing member 14 are respectively connected with the upper side plate 13 and the upper side plate 12. The lower side plate 12 is tightly fitted, and at the same time, the rear end forming sides of the first side sealing portion 142 and the second side sealing portion 143 are tightly fitted with the rear end of the upper side plate 13 to form a seal.

22 and 23, the first mounting groove 142a has a side opening facing away from the driving part 113, the first support body 15 is provided with a first through groove 152, and one end of the first through groove 152 Through to the side of the first support body 15 facing away from the driving part 113, the first through groove 152 is connected to the bottom surface of the first installation groove 142a, the lower side plate 12 or the upper side plate 13 The inner surface forms the first communication channel 171, the second installation groove 143a has a side opening facing away from the driving part 113, the second support body 16 is provided with a second through groove, and the second One end of the through groove penetrates to the side of the second support body 16 facing away from the driving part 113, and the second through groove is connected to the bottom surface of the second installation groove 143a, the lower side plate 12 or the upper side. The inner surface of the plate 13 forms the second communication channel 172 . Cooling liquid enters the side flow channel between the two sides of the main body 111 and the lateral side walls of the protective sheath from the first communication flow channel 171 and the second communication flow channel 172, thereby delivering the cooling liquid to the cutter head.

As an alternative, the first side sealing part 142 and the second side sealing part 143 can also omit the first installation groove 142a and the second installation groove 143a, that is, the first support body 15 and the second support body 16 are directly connected to the upper side plate 13 is in contact with the lower side plate 12 , and a first communication channel 171 and a second communication channel 172 are formed between the first support body 15 , the second support body 16 , the upper side plate 13 and the lower side plate 12 .

As shown in Figures 9-13, the sealing member 14 further includes a sealing ring 141, the sealing ring 141 is sleeved on the main body 111, and the two ends of the sealing ring 141 in the transverse direction are connected to the first side respectively. The sealing portion 142 is connected to the front end of the second side sealing portion 143 , and the sealing ring 141 is sealingly engaged with the main body 111 , the upper side plate 13 and the lower side plate 12 . The sealing ring 141 is used to prevent coolant from entering the saw blade interface.

As an example, at least one first sealing rib 141b (see FIG. 12 ) extending transversely is provided on the bottom surface and the top surface of the sealing ring 141, and the first sealing rib 141b is connected to the lower side plate 12 and The upper side plate 13 is sealingly fitted (see FIG. 18 ). Preferably, a supporting ring 144 is provided in the central hole 141a corresponding to the first sealing bead 141b and the second sealing bead 141c, and an outward pressing force is applied to the first sealing bead 141b through the supporting ring 144, so that the second sealing bead 141b A sealing bead 141b is reliably sealed with the inner wall surfaces of the lower side plate 12 and the upper side plate 13 .

Referring to FIG. 13 , the bottom wall and the top wall of the central hole 141 a of the sealing ring 141 are provided with at least one second sealing rib 141 c extending in the transverse direction, the second sealing rib 141 c and the bottom surface of the main body 111 Mates with top seal. Preferably, sealing grooves 116 extending in the transverse direction are provided on the upper and lower surfaces of the main body 111 , and the second sealing ribs 141c are snapped into the sealing grooves 116 , so that the saw blade body 11 swings During the process, the second sealing rib 141c is always located in the sealing groove 116 to increase the sealing effect. The cross-sectional shapes of the second sealing rib 141c and the sealing groove 116 may be semicircular, rectangular, dovetail groove, or the like.

As shown in FIG. 11 , the sealing ring 141 further includes an elastic stretchable portion 141d located behind the second sealing rib 141c , and a swing cavity is provided between the inner wall of the elastic stretchable portion 141d and the main body 111 . 145. The elastic telescopic portion 141d is used for telescopic deformation when the sheath saw blade 1 swings, so as to ensure that the neck of the saw blade body 11 has enough cavity to swing left and right, so that the second sealing rib 141c is always located in the sealing groove 116, At the same time, the elastic resistance is reduced, and the isolation of the swing cavity 145 of the sheath saw blade 1 from the outside is ensured. Preferably, a plurality of grooves 141e extending laterally are provided on the outer top surface and the outer bottom surface of the elastically stretchable portion 141d to increase the deformation range of the elastically stretchable portion 141d. The material of the sealing member 14 is generally made of a material with good elastic deformation and sealing performance such as medical silicone rubber, which is integrally injection-molded.

5, 18, 19, preferably, the lower side plate 12 and the upper side plate 13 are provided with a first avoidance groove 126 and a second avoidance groove 134 at the positions corresponding to the sealing ring 141, and the first avoidance groove 126 and The second avoidance groove 134 can form a void when the saw blade body 11 and the sealing ring 141 swing, reduce frictional resistance, and prevent the sealing ring 141 from wearing and tearing. Features that increase the overall strength of the saw blade.

As shown in Figure 5, the sheathed saw blade 1 as an example also includes a first self-sealing joint 18 installed at the first coolant inlet 123 and the second coolant inlet 124, the sheathed saw blade 1 is installed with the machine head 2 When mating, the first self-sealing joint 18 cooperates with the second self-sealing joint 25 on the machine head 2, which can avoid the special installation of a separate water injection interface.

As shown in FIGS. 14 and 15 , the first self-sealing joint 18 includes an insertion hole 182 for matching with the plug 252 of the second self-sealing joint 25 . Preferably, the inner wall of the insertion hole 182 is provided with several axially spaced annular sealing ribs 184. Preferably, the insertion hole 182 is trumpet-shaped. The first self-sealing joint 18 as an example also includes a first installation part 181, and the first installation part 181 is inserted and fixed in the first cooling liquid inlet 123 or the second cooling liquid inlet 124. As an example, an annular saw blade installation groove 183 is provided on the outer peripheral surface of the first mounting portion 181, and an annular convex strip 127 ( See FIG. 21 ), the annular protruding strip 127 snaps into the annular saw blade mounting groove 183 to achieve sealing. Preferably, the position of the first through groove 152 and the second through groove corresponding to the first self-sealing joint 18 is provided with a joint positioning groove 153 (see FIG. 8 ), and the head of the first installation part 181 The first self-sealing joint 18 is positioned through the joint positioning groove 153. The first self-sealing joint 18 can be made of medical silicone rubber.

In the sheath saw blade 1 in this embodiment, the sealing member 14 cooperates with the lower side plate 12 , the upper side plate 13 , the first support body 15 , the second support body 16 , the first self-sealing joint 18 , and the saw blade body 11 . , After the lower side plate 12 and the upper side plate 13 are installed and welded in place, the elastic sealing surface of the seal 14 is squeezed through the lower side plate 12 and the upper side plate 13 (as shown in Figures 18 and 23), so that the upper and lower sides of the seal 14 are respectively The lower side plate 12 and the upper side plate 13 are closely matched, and at the same time, the elastic sealing molding side is closely matched with the rear end of the upper side plate 13 to form a seal. At the same time, the sealing ring 141 of the sealing member 14 can realize dynamic sealing under the state of telescopic deformation and swinging during the high frequency swinging motion of the saw blade body 11. The sealing structure is especially suitable for swinging medical instruments. The device has a simple and reliable structure and is easy to install. For products with a small thickness of the sheath saw blade 1, dynamic sealing can be achieved, and the increased thickness is small, and it will not block the doctor's field of vision during use. . In addition, when the sheath saw blade 1 is installed on the handpiece 2, the water injection interface is installed in place at the same time, that is, the water injection interface can be exempted from installation, and the water injection cooling and flushing function can be realized, which is convenient for doctors to install the saw blade efficiently and quickly. and perform surgery.

As an alternative, the sheath saw blade 1 can omit the first support body 15 and the second support body 16, and the first side seal portion 142 and the second side seal portion 143 of the seal member 14 arranged on both sides of the drive portion 113 can be used to seal Play a supporting role, that is, the first side sealing part 142 and the second side sealing part 143 play a role of sealing and supporting at the same time. The coolant inlet includes a first coolant inlet and a second coolant inlet provided on the rear end of the lower side plate or the upper side plate, the first side seal and the second side seal The bottom surface or the top surface of the part is provided with a diversion groove, and the saw blade cooling cavity includes a side surface formed in the transverse direction of the main body, between the first side sealing part and a side wall in the transverse direction of the protective sheath The first side flow channel of the main body, the second side flow channel formed between the second side sealing part and the other side wall of the sheath in the transverse direction, the other side surface in the transverse direction of the main body, the The diversion groove on the first side sealing part communicates with the first cooling liquid inlet and the first side channel, and the diversion groove on the second side sealing part communicates with the second cooling liquid inlet and The second side channel. The sheath saw blade of this structure has few parts and simple structure.

As shown in Figures 3 and 24, the machine head 2 in this embodiment includes a machine head housing 21 and a reciprocating yaw mechanism arranged in the machine head housing 21. The reciprocating yaw mechanism includes an eccentric shaft 26, a shift fork 27 and Pendulum 28.

As shown in Figures 25-27, the head housing 21 includes a first shell 213 and a second shell 214, the first shell 213 is a cylindrical structure extending along the first axis, and the second shell 214 is a vertical A cylindrical structure extending on the second axis of the first axis, the second shell 214 is connected to the front end of the first shell 213, and a mechanism for passing the cooling liquid is arranged on the first shell 213. The head cooling chamber also includes a liquid injection port 211b and a cooling liquid outlet 211a communicating with the head cooling chamber. When the coolant passes through the cooling cavity of the machine head, it will take away the heat in the machine head, so as to realize the effect of rapid heat dissipation and improve the life of the machine head.

As an example, the first shell 213 includes an outer shell 211 and a cooling ring 212 disposed in the outer shell 211, a gap is left between the cooling ring 212 and the outer shell 211 to form the head cooling chamber, the The liquid injection port 211b and the cooling liquid outlet 211a are disposed on the housing 211 . The liquid injection port 211b and the cooling liquid outlet 211a are arranged on the housing 211, which is convenient for processing and assembling and saves cost. As an example, a front end sealing ring 22 and a rear end sealing ring 23 are respectively provided between the front end and the rear end of the cooling ring 212 and the inner wall of the housing 211 to form a gap between the cooling ring 212 and the housing 211. In the cooling cavity of the machine head, at least one spacer ring 212a is arranged between the cooling ring 212 and the outer shell 211 to divide the cooling cavity of the machine head into at least two cooling cavity units arranged in the axial direction, at least The two cooling chamber units communicate with each other through the communication hole 212b provided on the spacer ring 212a to form the machine head cooling chamber. Preferably, the communication holes 212b on the two adjacent spacers 212a are staggered so that the cooling liquid flows in an S-shape between the cooling cavity units, so that the cooling liquid flow is longer to fully dissipate heat.

As shown in FIGS. 28 and 29 , as an example, the spacer ring 212 a is integrally formed on the cooling ring 212 , and an intermediate sealing ring 24 is disposed between the spacer ring 212 a and the housing 211 . Preferably, the spacer ring 212a is provided with a sealing ring installation groove 212c for installing the sealing ring, and the communication hole 212b is provided at the bottom of the sealing ring installation groove 212c. Preferably, the communication holes 212b are waist-shaped holes extending in the circumferential direction, and there are multiple communication holes 212b, so that the flow of the cooling liquid in each chamber can be transferred quickly. The inner wall of the cooling ring 212 is provided with a plurality of heat dissipation grooves 212d, which can increase the area of the inner surface, and can absorb more heat dissipated from the inside when the handpiece is running, so as to achieve better heat dissipation and cooling effect. The outer diameter of the cooling ring 212 has an external thread 212f, and the end face has a mounting bayonet 212e. During installation, use a tool to cooperate with the mounting bayonet 212e to screw the cooling ring 212 with the sealing ring installed into the thread of the machine head housing 21 to fix it. Each chamber forms a good seal under the action of the sealing ring. The material of the cooling ring 212 is generally made of copper alloy and stainless steel with better absorption and heat dissipation effect.

As shown in FIG. 27, preferably, the cooling liquid outlet 211a is provided on the top of the housing 211. When the saw blade interface is assembled with the joint interface, the cooling liquid outlet 211a communicates with the cooling liquid inlets 123 and 124. , the cooling liquid is injected into the sheath saw blade 1 through the cooling liquid outlet 211a and the cooling liquid inlet, and the sheath saw blade 1 is cooled at the same time. Preferably, the liquid injection port 211b is provided at the bottom of the housing 211 and communicates with the last cooling chamber unit. The liquid injection port 211b is provided with a liquid injection joint 215, and the liquid injection joint 215 is connected to one end of the liquid injection pipe 4 connected, the cooling liquid outlet 211a is provided on the top of the housing 211 and communicates with the first cooling cavity unit.

As shown in the figures, as indicated by 25 and 27, the handpiece 2 further includes a second self-sealing joint 25 disposed at the cooling liquid outlet 211a. As shown in FIGS. 32 and 33 , the second self-sealing joint 25 includes a plug 252 that fits with the insertion hole 182 of the second self-sealing joint 25 , and the sheath saw blade 1 is assembled with the handpiece. The plug 252 is inserted into the insertion hole 182 . Preferably, the outer wall of the plug 252 is provided with a plurality of annular sealing grooves 253 spaced in the axial direction. When the plug 252 is inserted into the insertion hole 182, the annular sealing groove 253 and the annular sealing rib 184 Seal fit. Preferably, the plug 252 is a conical shape matched with the trumpet-shaped insertion hole 182, so that the plug 252 can be easily inserted into the connector portion. The second self-sealing joint 25 further includes a second mounting portion 251, and the second mounting portion 251 is inserted and fixed in the cooling liquid outlet 211a. As an example, the outer circumference of the second mounting portion 251 is provided with an external thread 254, the inner wall of the cooling liquid outlet 211a is provided with an internal thread, and the second mounting portion 251 is screwed into the cooling liquid outlet 211a through the external thread 254 and the external thread Inside. The second self-sealing joint 25 is made of stainless steel or medical grade materials such as PEI, PC, and ABS. During installation, the first self-sealing joint 18 and the second self-sealing joint 25 respectively located on the sheath saw blade 1 and the machine head can be automatically positioned according to the installation position, and make the plurality of annular sealing ribs 184 and the annular sealing groove 116 . The elastic shrink fit and multi-groove forming fit seal to achieve the effect of automatic sealing after installation.

In the machine head in this embodiment, when the coolant flow is injected from the water injection port of the machine head, the coolant gradually fills the first cooling cavity unit 251, and enters the second cooling cavity unit through the top communication hole 212b after filling. 252. Similarly, when the cooling chamber is full, it enters the third cooling chamber unit 253 from the bottom communication hole 212b, and discharges the inner injection water injected into the saw blade through the second self-sealing joint 25 after the third cooling chamber unit 253 is full. in the way. Therefore, the coolant injected from the water injection port of the machine head circulates in the three cooling chambers respectively along the circumference and in the axial direction in the three chambers in an "S" shape. The heat in the head is taken away to achieve a good heat dissipation and cooling effect.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that for those skilled in the art, without departing from the concept of the present invention, some modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims (14)

1. A sheath saw blade with a cooling system, comprising: The saw blade body includes a main body extending longitudinally, a driving part connected to the rear end of the main body and saw teeth connected to the front end of the main body, the driving part is provided with a saw blade interface for connecting with the machine head interface; A protective sheath is sheathed on the saw blade body, and the protective sheath includes a lower side plate and an upper side plate; It is characterized in that it also includes: The seal is arranged in the rear end of the protective sheath, and seals and cooperates with the main body, the lower side plate, and the upper side plate to form a saw blade cooling cavity extending from the rear to the front, and the lower side plate Or the rear end of the upper side plate is provided with a cooling liquid inlet communicating with the saw blade cooling chamber. 2 . The sheath saw blade with a cooling system according to claim 1 , wherein the sealing member comprises a first ring that surrounds the longitudinal sides of the driving part and is symmetrical along the longitudinal center axis of the driving part. 3 . The side sealing part and the second side sealing part, the positions where the first side sealing part and the second side sealing part contact the driving part, the lower side plate and the upper side plate have elastic structures, forming a seal with the driving part, the lower side plate and the upper side plate. 3 . The sheath saw blade with a cooling system according to claim 2 , wherein the cooling liquid inlet comprises a first cooling liquid disposed on the rear end of the lower side plate or the upper side plate. 4 . The inlet and the second cooling liquid inlet, the bottom surface or the top surface of the first side sealing part and the second side sealing part are provided with guide grooves, and the saw blade cooling cavity includes a The side surface, the first side flow channel between the first side sealing part and one side wall in the transverse direction of the sheath, the other side surface formed in the transverse direction of the main body, the second side sealing part and the The second side flow channel between the other side wall in the transverse direction of the sheath and the guide groove on the first side sealing part communicate with the first cooling liquid inlet and the first side flow channel , the guide groove on the second side sealing part communicates with the second cooling liquid inlet and the second side flow channel. 4 . The sheath saw blade with cooling system according to claim 2 , further comprising a first support body and a second support body, wherein the first support body and the second support body are arranged on the The two sides of the driving part are symmetrical along the longitudinal center axis of the driving part; A first mounting groove for mounting the first support body and a second mounting groove for mounting the second support body are respectively provided on the bottom surface or top surface of the first side sealing portion and the second side sealing portion. an installation groove, and the depths of the first installation groove and the second installation groove are greater than the thicknesses of the first support body and the second support body, and the first support body and the second support body are respectively Installed in the first installation groove and the second installation groove. 5. The sheathed saw blade with a cooling system according to claim 4, wherein the coolant inlet comprises a first coolant provided on the rear end of the lower side plate or the upper side plate An inlet and a second coolant inlet, the saw blade cooling cavity includes a lateral side formed on the main body, a side of the first support body facing away from the driving part, and a lateral side of the protective sheath Between the first side channel between the walls, the other lateral side of the main body, the side of the second support body facing away from the driving part, and the other lateral side wall of the sheath The second side channel between the two, the first communication channel connecting the first coolant inlet and the first side channel, and the second coolant inlet and the second side channel the second connecting channel. 6 . The sheath saw blade with a cooling system according to claim 5 , wherein the first installation groove has a side opening facing away from the driving part, and the first support body is provided with a first a through slot, one end of the first through slot penetrates to the side of the first support body facing away from the driving part, the first through slot and the bottom surface of the first installation slot, the lower side plate or the The inner surface of the upper side plate forms the first communication channel, the second installation groove has a side opening facing away from the driving part, the second support body is provided with a second through groove, the first One end of the two through grooves penetrates to the side of the second support body facing away from the driving part, the second through groove and the bottom surface of the second installation groove, the inner side of the lower side plate or the upper side plate The surface forms the second communication channel. 7 . The sheath saw blade with a cooling system according to claim 6 , wherein the first cooling liquid inlet and the second cooling liquid inlet are respectively connected with the first through groove and the second cooling liquid inlet. 8 . The through grooves are opposite to each other, the first cooling liquid inlet and the second cooling liquid inlet are provided with self-sealing joints, and the positions corresponding to the first and second through grooves and the self-sealing joints are provided with A joint positioning groove, the head of the self-sealing joint is matched with the joint positioning groove. 8. The sheathed saw blade with a cooling system according to any one of claims 2-7, characterized in that, the sealing member further comprises a sealing ring, and the sealing ring is sleeved on the main body, the Both ends of the sealing ring in the transverse direction are respectively connected to the front ends of the first side sealing part and the second side sealing part, and the sealing ring is sealingly engaged with the main body, the upper side plate and the lower side plate . 9 . The sheath saw blade with cooling system according to claim 8 , wherein the bottom and top surfaces of the sealing ring are provided with at least one first sealing rib extending in the transverse direction, and the first sealing rib extends laterally. The sealing rib is in sealing fit with the lower side plate and the upper side plate. 10 . The sheath-protected saw blade with a cooling system according to claim 9 , wherein a support ring is arranged in a central hole of the sealing ring corresponding to the first sealing rib. 11 . 11 . The sheath saw blade with cooling system according to claim 8 , wherein the bottom wall and the top wall of the central hole of the sealing ring are provided with at least one second sealing rib extending laterally, 11 . The second sealing rib is in sealing fit with the bottom surface and the top surface of the main body; the bottom surface and the top surface of the main body are provided with at least one sealing groove extending in the transverse direction, and the second sealing rib is snapped into the bottom surface and the top surface of the main body. into the sealing groove. 12 . The sheath saw blade with cooling system according to claim 11 , wherein the sealing ring further comprises an elastic expansion and contraction part located behind the second sealing rib, and the inner wall of the elastic expansion and contraction part is connected with the inner wall of the elastic expansion and contraction part. 13 . A swing cavity is arranged between the main bodies. 13 . The sheathed saw blade with a cooling system according to claim 12 , wherein a plurality of grooves extending in the transverse direction are formed on the top surface and the bottom surface of the telescopic portion. 14 . 14. The sheathed saw blade with a cooling system according to claim 8, characterized in that, the positions of the lower side plate and the upper side plate corresponding to the sealing ring are respectively provided with first escape grooves and a second avoidance groove, the sealing ring is located in the first avoidance groove and the second avoidance groove.

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