Surgical reciprocating bone saw

Abstract

The utility model relates to medical apparatus and instruments technical field especially, it relates to a reciprocating bone saw for operation, including saw blade subassembly and drive handle subassembly, saw blade subassembly includes saw blade body and connecting pipe, be provided with a plurality of saw teeth on saw blade body, a plurality of saw teeth constitute the cutting part of arc, connecting pipe sets up on saw blade body, is equipped with the water hole on connecting pipe, drive handle subassembly includes shell, water injection mechanism and swing drive mechanism, swing drive mechanism includes the transmission rod of tubular structure, is equipped with the water pass hole on transmission rod, water injection mechanism includes spiral cover, spiral cover sets up in the shell, one end of spiral cover is provided with the water inlet, the other end of spiral cover is provided with the water outlet gap, the water inlet, water outlet gap, water pass hole and water hole intercommunicate and form the water injection channel in proper order. The utility model solves the problem that the existing technology's orthopedics swing saw has the risk of high temperature damage to bone tissue when cutting bone tissue at high speed because of heat generated by bone tissue and saw blade.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a reciprocating bone saw for surgery. Background Technology

[0002] In surgical procedures, bone saws are frequently used to operate on patients. In complex situations requiring close contact with sensitive nerves, blood vessels, and other soft tissues for bone cutting, traditional rotary drills pose a risk of entanglement, while linear reciprocating saws are unsuitable for confined spaces due to their long stroke. The oscillating saw, however, perfectly balances efficiency and safety. The core technology of the oscillating saw lies in the movement of its blade. Unlike traditional bone saws that perform linear reciprocating motion, the oscillating saw blade oscillates at high speed and small angles around an axis, its trajectory resembling a pendulum. This oscillation angle is typically very small (usually between 2 and 5 degrees), but the frequency is extremely high.

[0003] The existing oscillating saw has a cylindrical saw bar with a flat saw blade fixed to one end. The plane of the saw blade forms a right angle with the center line of the saw bar. The saw blade has serrations around its perimeter. The saw bar is connected to an external power mechanism. In use, the power mechanism drives the saw bar to rotate back and forth, which in turn drives the saw blade to oscillate back and forth, thus achieving the cutting of bone tissue. For example, patent CN212729905U discloses an ultra-long curved osteotomy saw for the mandible, including a housing. Inside the housing, from back to front, a power input shaft, an eccentric wheel shaft, a rocker arm, and an output shaft are sequentially arranged and connected by bearings. The power input shaft and the eccentric wheel shaft are meshed by gears. The eccentric wheel shaft is provided with an eccentric shaft that connects to one end of the rocker arm. The other end of the rocker arm is connected to one end of the output shaft. The other end of the output shaft is connected to a blade body. The blade body includes a handle and a saw blade provided at one end of the handle. The handle is provided with a strip-shaped protrusion. The output shaft is hollow at the end connected to the blade body and has an opening on the side. The handle is inserted into the end of the output shaft, and the strip-shaped protrusion is engaged in the opening. A locking sleeve is provided and is connected to the end of the output shaft by threads, and the opening is tightened by screwing.

[0004] Although the bone saw described above can form an oscillating saw structure that can reciprocate and oscillate to cut bone tissue, the extremely high frequency of the oscillating saw during cutting causes the saw blade to rub against the bone tissue at high speed. This generates heat between the bone tissue and the saw blade, posing a risk of high-temperature damage to the bone tissue. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a surgical reciprocating bone saw that solves the problem that existing orthopedic oscillating saws pose a risk of high-temperature damage to bone tissue when cutting bone tissue at high speed due to the heat generated by the bone tissue and the saw blade.

[0006] This utility model solves the above-mentioned technical problems through the following technical means: This invention provides a reciprocating bone saw for surgery, including a saw blade assembly and a drive handle assembly. The saw blade assembly includes a saw blade body and a connecting pipe; the saw blade body is provided with a plurality of saw teeth, and the plurality of saw teeth form an arc-shaped cutting part; the connecting pipe is provided on the end of the saw blade body away from the cutting part; the angle between the connecting pipe and the saw blade body is 90-150°; and the connecting pipe is provided with a water outlet in the circumferential direction. The drive handle assembly includes a housing, a water injection mechanism, and a swing drive mechanism. The swing drive mechanism includes a tubular transmission rod with a water passage hole. The swing drive mechanism uses the transmission rod to drive the connecting pipe and the saw blade body to swing back and forth. The water injection mechanism includes a spiral sleeve inside the housing. One end of the spiral sleeve has a water inlet, and the other end has a water outlet. The water inlet, water outlet, water passage hole, and water outlet hole are sequentially connected to form a water injection channel.

[0007] Furthermore, the saw blade body is fan-shaped and has perforated holes. The fan-shaped shape of the saw blade body makes the saw blade body smaller, reducing obstruction of the surgical field of vision; and the perforated holes not only reduce the weight of the saw blade body, but also reduce obstruction of the surgical field of vision, making it easier for medical staff to operate.

[0008] Furthermore, the swing drive mechanism also includes a transmission shaft. One end of the transmission shaft is provided with a connecting part, and the other end is eccentrically provided with an eccentric shaft. A first bearing is sleeved on the eccentric shaft, and a shift fork is sleeved on the outer ring of the first bearing. A swing rod is fixedly connected to the shift fork, and the swing rod is driven by the transmission rod. In this technical solution, the connecting part of the transmission shaft is used to connect to an external power mechanism. The external power mechanism drives the transmission shaft to rotate, and then the eccentric shaft at its end follows by eccentric rotation, causing the first bearing to slide within the fork of the shift fork. This causes the shift fork to swing left and right in a circumferential direction, which in turn drives the saw blade body to swing back and forth through the transmission rod, and the saw teeth remove bone tissue.

[0009] Furthermore, the outer casing includes a first outer casing and a second outer casing. The end of the first outer casing furthest from the saw blade body is detachably disposed within the second outer casing. The spiral sleeve is disposed within the second outer casing, and an interface sleeve is disposed within the spiral sleeve. One end of the spiral sleeve is fitted onto the first outer casing, and the other end is fitted onto the interface sleeve. The first outer casing has a first stepped hole, and a support sleeve is disposed within the larger hole of the first stepped hole. The support sleeve is fitted onto the second transmission rod, and the end of the support sleeve inserted into the first outer casing has a second stepped hole. The inner diameter of the second stepped hole is larger than the outer diameter of the second transmission rod. A water-blocking sleeve is fitted onto the second transmission rod, and one end of the water-blocking sleeve is inserted into the second stepped hole. The first stepped hole in the first outer casing, the second stepped hole in the support sleeve, the outer wall of the second transmission rod, and the water-blocking sleeve together form a water injection cavity. The water injection cavity is connected to the water outlet and the water passage hole on the second transmission rod. This technical solution is designed so that water injected from the inlet passes sequentially through the inlet, spiral sleeve, water outlet notch, water injection cavity, water passage hole, and water outlet hole, and the water coming out of the water outlet hole cools the saw blade body.

[0010] Furthermore, the water-blocking sleeve is provided with a third stepped hole, and a liner is inserted into the third stepped hole. The liner is sleeved on the second transmission rod.

[0011] Furthermore, the drive shaft passes through the interface sleeve, and a second bearing, a bearing retaining ring, and a bearing limiting sleeve are fitted onto the drive shaft. The second bearing is located between the bearing retaining ring and the bearing limiting sleeve, and the outer walls of the second bearing, the bearing retaining ring, and the bearing limiting sleeve all abut against the inner wall of the interface sleeve. The placement of the second bearing reduces friction and noise during drive shaft rotation, while the bearing retaining ring and bearing limiting sleeve prevent the second bearing from shifting.

[0012] Furthermore, the transmission rod includes a first transmission rod and a second transmission rod. One end of the first transmission rod is fixedly connected to the connecting pipe, and the other end of the first transmission rod is fixedly connected to the second transmission rod. The water passage hole is located on the second transmission rod, and the end of the second transmission rod away from the first transmission rod is fixedly connected to the swing rod. Dividing the transmission rod into a first transmission rod and a second transmission rod facilitates production and assembly.

[0013] Furthermore, the outlet of the water hole faces the cutting section. This arrangement improves the cooling and wetting effect of the injected water.

[0014] Furthermore, the support sleeve and the serrations are configured with a flat structure on the same side. This flat structure design on the same side of the support sleeve and the serrations increases the intraoperative field of vision.

[0015] Furthermore, an annular sealing groove is provided on the outer wall of the first transmission rod, and a sealing ring is provided inside the annular sealing groove. The annular sealing groove and sealing ring can prevent injected water from overflowing from the annular space between the first and second transmission rods, allowing more water to flow out from the outlet to cool and wet the cutting position.

[0016] This utility model has the following advantages: When in use, this utility model allows water to be injected from the inlet, passing through the inlet, spiral sleeve, water outlet notch, water injection cavity, water passage hole, and water outlet hole in sequence. The water coming out of the water outlet hole cools the saw blade body, and the heat generated by the bone tissue and saw blade is carried away in time, avoiding the risk of high temperature damage to the bone tissue. In addition, the injected water can also wet the cutting area, improving the cutting efficiency.

[0017] The angle between the connecting tube and the saw blade body of this invention is 90-150°, which can be applied to the cutting of various bone tissues, such as maxillofacial surgery, and has a wider range of applications.

[0018] The saw blade body of this utility model is fan-shaped and has hollow holes. The support sleeve and the saw teeth are set with a flat structure on the same side. This design can not only reduce the weight of the saw blade body, but also reduce the obstruction of the surgical field, making it easier for medical staff to operate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a surgical reciprocating bone saw according to this utility model; Figure 2 yes Figure 1 Exploded view; Figure 3 yes Figure 1 A sectional view; Figure 4 yes Figure 2 Schematic diagram of the middle shift fork; Figure 5 yes Figure 2 Schematic diagram of the middle saw blade assembly; Figure 6 yes Figure 2 Schematic diagram of the structure of the central spiral sleeve; Figure 7 yes Figure 3 A magnified view of a section at point A in the middle; Figure 8 yes Figure 3 A magnified view of a section at point B in the middle; Figure 9 yes Figure 3 A magnified view of a section at point C.

[0020] The components include: saw blade assembly 1, saw blade body 101, connecting pipe 102, saw teeth 103, perforated hole 104, and water outlet hole 105. Drive handle assembly 2, first housing 201, second housing 202, slot 203, retaining ring 204, first transmission rod 205, second transmission rod 206, annular sealing groove 207, sealing ring 208, transmission shaft 209, eccentric shaft 210, first bearing 211, shift fork 212, swing rod 213, water passage hole 214, spiral sleeve 215, water inlet 216, water outlet notch 217, interface sleeve 218, first stepped hole 219, support sleeve 220, flat structure 221, second stepped hole 222, water blocking sleeve 223, liner 224, second bearing 225, bearing retaining ring 226, bearing limiting sleeve 227. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures. They should not be construed as limiting the utility model. To better illustrate the embodiments of this utility model, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the figures for those skilled in the art.

[0022] In the figures of this utility model embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe the positional relationship in the figure are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

[0023] Please refer to Figures 1-9 In this embodiment, a surgical reciprocating bone saw is used, such as... Figure 1 As shown, it includes a saw blade assembly 1 and a drive handle assembly 2, such as Figure 2 and Figure 5As shown, the saw blade assembly 1 includes a saw blade body 101 and a connecting pipe 102. The saw blade body 101 has a plurality of saw teeth 103, which form an arc-shaped cutting section. The connecting pipe 102 is fixedly connected to the end of the saw blade body 101 away from the cutting section. The reciprocating rotation of the connecting pipe 102 causes the saw blade body 101 to reciprocate. This fixed connection can be welded or integrally formed. The angle between the connecting pipe 102 and the saw blade body 101 is 90-150°, and is 120° in this embodiment. To reduce weight and increase the intraoperative field of vision, the saw blade body 101 is fan-shaped and has perforated holes 104. The connecting pipe 102 has a water outlet 105, and the outlet of the water outlet 105 faces the top of the arc-shaped cutting section.

[0024] like Figure 8 As shown, the drive handle assembly 2 includes a housing, a water injection mechanism, and a swing drive mechanism; wherein, the housing includes a first housing 201 and a second housing 202, and the right end of the first housing 201 is detachably disposed inside the second housing 202; specifically, the outer wall of the first housing 201 has a circumferentially arranged slot 203, and the second housing 202 is provided with a retaining ring 204 corresponding to the slot 203, and the retaining ring 204 is tightly embedded in the slot 203.

[0025] like Figures 2-4 , Figures 5-9 As shown, the swing drive mechanism includes a tubular first transmission rod 205 and a second transmission rod 206. An annular sealing groove 207 is provided on the outer wall of the first transmission rod 205, and a sealing ring 208 is provided in the annular sealing groove 207. The left end of the first transmission rod 205 is fixedly connected to the connecting pipe 102, which can be integrally formed or welded together; the right end is fixedly inserted into the second transmission rod 206, which can be an interference fit or glued together. The annular sealing groove 207 and the sealing ring 208 can prevent injected water from overflowing from the annular space between the first transmission rod 205 and the second transmission rod 206. The swing drive mechanism also includes a drive shaft 209. The right end of the drive shaft 209 is provided with a connecting part for connecting an external power mechanism, such as a motor. The other end is eccentrically formed with an eccentric shaft 210. A first bearing 211 is sleeved on the eccentric shaft 210. A shift fork 212 is sleeved on the outer ring of the first bearing 211. A swing rod 213 is fixedly connected to the shift fork 212. The other end of the swing rod 213 passes through the end of the second drive rod 206 away from the first drive rod 205 and is fixedly sealed with glue.

[0026] like Figure 6 and Figure 8As shown, a water passage hole 214 is provided on the second transmission rod 206. The water injection mechanism includes a spiral sleeve 215, which is disposed inside the second outer shell 202. One end of the spiral sleeve 215 is provided with a water inlet 216, and the other end of the spiral sleeve 215 is provided with a water outlet notch 217. The water inlet 216, the water outlet notch 217, the water passage hole 214 and the water outlet hole 105 are connected to each other in sequence to form a water injection channel. An interface sleeve 218 is provided inside the spiral sleeve 215. The left end of the spiral sleeve 215 is fitted onto the first outer shell 201, and the other end is fitted onto the interface sleeve 218. The first outer shell 201 has a first stepped hole 219. A support sleeve 220 is provided inside the large hole of the first stepped hole 219. The support sleeve 220 is fitted onto the second transmission rod 206, which makes the second transmission rod 206 more stable when transmitting torque during rotation and also prevents the second transmission rod 206 from twisting and deforming during swinging. In order to increase the intraoperative operating field of vision, the support sleeve 220 is set with a flat structure 221 on the same side as the saw tooth 103. The outer wall of the support sleeve 220 is connected and sealed to the hole wall of the first stepped hole 219 with glue. The support sleeve 220 is inserted into the first outer shell 201. One end has a second stepped hole 222, the inner diameter of which is larger than the outer diameter of the second transmission rod 206. A water-blocking sleeve 223 is fitted on the second transmission rod 206, and one end of the water-blocking sleeve 223 is inserted into the second stepped hole 222. The first stepped hole 219 in the first outer shell 201, the second stepped hole 222 in the support sleeve 220, the outer wall of the second transmission rod 206, and the water-blocking sleeve 223 together form a water injection cavity. The water injection cavity is connected to the water outlet 217 and the water passage hole 214 on the second transmission rod 206. In this way, the injected water passes through the water inlet 216, the spiral sleeve 215, the water outlet 217, the water injection cavity, the water passage hole 214, and the water outlet hole 105 in sequence. The water coming out of the water outlet hole 105 cools the saw blade body 101.

[0027] like Figure 7 As shown, the water-blocking sleeve 223 has a third stepped hole inside, into which a liner 224 is inserted. The liner 224 is sleeved on the second transmission rod 206. Figure 2 and Figure 9 As shown, the drive shaft 209 passes through the interface sleeve 218. To reduce friction and noise when the drive shaft 209 rotates, a second bearing 225, a bearing retaining ring 226, and a bearing limiting sleeve 227 are fitted on the drive shaft 209. The second bearing 225 is located between the bearing retaining ring 226 and the bearing limiting sleeve 227. The outer walls of the second bearing 225, the bearing retaining ring 226, and the bearing limiting sleeve 227 all abut against the inner wall of the interface sleeve 218.

[0028] The operating principle of the surgical reciprocating bone saw in this embodiment is as follows: In use, firstly, an external motor is connected via the drive shaft 209, and a water pipe is connected to the water source at the water inlet 216. Then, the motor is started, and the motor rotates, first driving the drive shaft 209 to rotate. As the drive shaft 209 rotates, the eccentric shaft 210 at its end follows and rotates eccentrically, causing the first bearing 211 to slide and engage within the fork of the shift fork 212. This causes the shift fork 212 to move left and right in a circular direction, which in turn drives the saw blade body 101 to swing back and forth via the first drive rod 205 and the second drive rod 206, thus removing bone tissue.

[0029] During the procedure, water is injected sequentially through the inlet 216, the spiral sleeve 215, the outlet 217, the water injection cavity, the water passage 214, and the outlet 105. The water coming out of the outlet 105 cools the saw blade body 101, and the heat generated by the bone tissue and the saw blade is carried away in time, avoiding the risk of high temperature damage to the bone tissue.

[0030] During surgery, because the saw blade body 101 is fan-shaped and has a perforated hole 104, and the support sleeve 220 and the saw teeth 103 are on the same side with a flat structure 221, the weight of the saw blade body 101 can be reduced, making it easier for medical staff to hold and reducing obstruction of the surgical field, making it easier for medical staff to operate.

[0031] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

Claims

1. A surgical reciprocating bone saw, comprising a saw blade assembly and a drive handle assembly, characterized in that: The saw blade assembly includes a saw blade body and a connecting pipe; the saw blade body is provided with a plurality of saw teeth, and the plurality of saw teeth form an arc-shaped cutting part; the connecting pipe is provided on the end of the saw blade body away from the cutting part; the angle between the connecting pipe and the saw blade body is 90-150°; and the connecting pipe is provided with a water outlet in the circumferential direction. The drive handle assembly includes a housing, a water injection mechanism, and a swing drive mechanism. The swing drive mechanism includes a tubular transmission rod with a water passage hole. The swing drive mechanism uses the transmission rod to drive the connecting pipe and the saw blade body to swing back and forth. The water injection mechanism includes a spiral sleeve inside the housing. One end of the spiral sleeve has a water inlet, and the other end has a water outlet. The water inlet, water outlet, water passage hole, and water outlet hole are sequentially connected to form a water injection channel.

2. The surgical reciprocating bone saw according to claim 1, characterized in that, The saw blade body is fan-shaped and has perforated holes.

3. The surgical reciprocating bone saw according to claim 1, characterized in that, The swing drive mechanism also includes a transmission shaft, one end of which is provided with a connecting part, and the other end is provided with an eccentric shaft. A first bearing is sleeved on the eccentric shaft, and a shift fork is sleeved on the outer ring of the first bearing. A swing rod is fixedly connected to the shift fork, and the swing rod is connected to the transmission rod in a driving connection.

4. A surgical reciprocating bone saw according to claim 3, characterized in that, The outer casing includes a first outer casing and a second outer casing. The end of the first outer casing furthest from the saw blade body is detachably disposed inside the second outer casing. A spiral sleeve is disposed inside the second outer casing, and an interface sleeve is disposed inside the spiral sleeve. One end of the spiral sleeve is sleeved on the first outer casing, and the other end is sleeved on the interface sleeve. The first outer casing has a first stepped hole, and a support sleeve is disposed in the larger hole of the first stepped hole. The support sleeve is sleeved on the second transmission rod. The end of the support sleeve inserted into the first outer casing has a second stepped hole. The inner diameter of the second stepped hole is larger than the outer diameter of the second transmission rod. A water-blocking sleeve is sleeved on the second transmission rod, and one end of the water-blocking sleeve is inserted into the second stepped hole. The first stepped hole in the first outer casing, the second stepped hole in the support sleeve, the outer wall of the second transmission rod, and the water-blocking sleeve together form a water injection cavity. The water injection cavity is connected to the water outlet and the water passage hole on the second transmission rod.

5. A surgical reciprocating bone saw according to claim 4, characterized in that, The water-blocking sleeve has a third stepped hole inside, and a liner is inserted into the third stepped hole. The liner is sleeved on the second transmission rod.

6. A surgical reciprocating bone saw according to claim 5, characterized in that, The drive shaft passes through the interface sleeve, and a second bearing, a bearing retaining ring, and a bearing limiting sleeve are fitted on the drive shaft. The second bearing is located between the bearing retaining ring and the bearing limiting sleeve, and the outer walls of the second bearing, the bearing retaining ring, and the bearing limiting sleeve all abut against the inner wall of the interface sleeve.

7. A surgical reciprocating bone saw according to claim 6, characterized in that, The transmission rod includes a first transmission rod and a second transmission rod. One end of the first transmission rod is fixedly connected to the connecting pipe, and the other end of the first transmission rod is fixedly connected to the second transmission rod. The water passage hole is provided on the second transmission rod, and the end of the second transmission rod away from the first transmission rod is fixedly connected to the swing rod.

8. A surgical reciprocating bone saw according to any one of claims 1-7, characterized in that, The outlet of the water outlet faces the cutting section.

9. A surgical reciprocating bone saw according to any one of claims 4-7, characterized in that, The support sleeve and the saw teeth are configured with a flat structure on the same side.

10. A surgical reciprocating bone saw according to claim 7, characterized in that, An annular sealing groove is provided on the outer wall of the first transmission rod, and a sealing ring is provided inside the annular sealing groove.

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